MAX17608-10 Datasheet by Maxim Integrated

View All Related Products | Download PDF Datasheet
MAX17608IMAX17609I 4.5V to 60V, 1A Current Limiter maxim Integrated ,,
General Description
The Olympus series of ICs are the industry’s smallest
and robust integrated system protection solutions. The
MAX17608/MAX17609/MAX17610 adjustable overvoltage
and overcurrent protection devices are ideal to protect
systems against positive and negative input voltage faults up
to +60V and -65V, and feature low 260mΩ (typ) RON FETs.
The adjustable input overvoltage protection range is 5.5V
to 60V and the adjustable input undervoltage protection
range is 4.5V to 59V. The input overvoltage-lockout
(OVLO) and undervoltage-lockout (UVLO) thresholds are
set using external resistors. Additionally, the devices offer
an internal input undervoltage threshold at 4V (typ).
The devices feature programmable current-limit protection
up to 1A; hence, controlling the inrush current at startup
while charging high capacitances at the output. Current-
limit threshold is programmed by connecting a resistor from
the SETI pin to GND. When the device current reaches
the programmed threshold, the device prevents further
increases in current by modulating the FET resistance. The
devices can be programmed to behave in three different
ways under current-limit condition: Autoretry, Continous, or
Latch-off modes. The voltage appearing on the SETI pin is
proportional to the instantaneous current flowing through
the device and is read by an ADC.
MAX17608 and MAX17610 block current flowing in the
reverse direction (i.e., from OUT to IN) whereas MAX17609
allows current flow in the reverse direction. The devices
feature thermal shutdown protection against excessive
power dissipation.
The devices are available in a small, 12-pin (3mm x 3mm)
TDFN-EP package. The devices operate over the -40°C to
+125°C extended temperature range.
Applications
Sensor Systems
Condition Monitoring
Factory Sensors
Process Instrumentation
Weighing and Batching Systems
Industrial Applications such as PLC, Network-Control
Modules, Battery-Operated Modules
Ordering Information appears at end of data sheet.
19-100228; Rev 1; 6/18
Benefits and Features
Robust Protection Reduces System Downtime
Wide Input-Supply Range: +4.5V to +60V
Hot Plug-in Tolerant Without TVS up to 35V Input
Supply
Negative Input Tolerance to -65V
Low RON 260mΩ (typ)
Reverse Current-Blocking Protection
Thermal Overload Protection
Extended -40°C to +125°C Temperature Range
MAX17608 Enables OV, UV, and Reverse Voltage
Protection
MAX17609 Enables OV and UV Protection
MAX17610 Enables Reverse Voltage Protection
Flexible Design Options Enable Reuse and Less
Requalification
Adjustable OVLO and UVLO Thresholds
Programmable Forward-Current Limit: 0.1A to 0.2A
with ±5% Accuracy and 0.2A to 1.0A with ±3%
Accuracy Over Full Temperature Range
Programmable Overcurrent Fault Response:
Autoretry, Continuous, and Latch-Off Modes
Smooth Current Transitions
Saves Board Space and Reduces External BOM
Count
12-Pin, 3mm x 3mm, TDFN-EP Package
Integrated FETs
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
EVALUATION KIT AVAILABLE
Click here for production status of specific part numbers.
Typical Operating Circuits
SYSTEM
SYSTEM
POWER
SUPPLY
ADC
R3
R4
R1
R2
R
SETI
0.47µF
OPTIONAL
FOR
HIGH
INPUT
SURGE
APPLICATIONS
MAX17608
MAX17609
IN
OVLO
UVLO
CLMODE
OUT
FLAG
UVOV
EN
SETI
GND
EN
4.7µF
FAULT
UV/OV FAULT
V
PULLUP
SYSTEM
SYSTEM
POWER
SUPPLY
ADC
R
SETI
0.47µF
OPTIONAL
FOR
HIGH
INPUT
SURGE
APPLICATIONS
MAX17610
IN
CLMODE
OUT
FWD
REV
EN
SETI
GND
EN
4.7µF
FORWARD
FAULT
REVERSE
FAULT
V
PULLUP
MAX17608 and MAX17609
MAX17610
www.maximintegrated.com Maxim Integrated
2
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
IN to GND ............................................................... -70V to +65V
IN to OUT ...............................................................-65V to +65V
OUT to GND ......................................................... -0.3V to +65V
UVLO, OVLO to GND .............-0.3V to MAX(VIN, VOUT) + 0.3V
UVOV, FLAG, FWD, REV, EN,
CLMODE to GND .............................................-0.3V to +6.0V
IN Current (DC) ....................................................................1.1A
SETI to GND (Note 1) ..........................................-0.3V to +1.6V
Continuous Power Dissipation (12 pin TDFN-EP
(TA = +70°C, derate 24.4mW/°C above +70°C)) ...1951.2mW
Extended Operating Temperature Range ...........-40°C to 125°C
Junction Temperature Range (Note 2) ............. -40°C to +150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (Soldering, 10s) .................................+300°C
Note 1: SETI pin is internally clamped. Forcing more than 5mA current into the pin can damage the device.
Note 2: Junction temperature greater than +125oC degrades operating lifetimes.
PACKAGE TYPE: 12 TDFN
Package Code TD1233+1C
Outline Number 21-0664
Land Pattern Number 90-0397
THERMAL RESISTANCE, FOUR-LAYER BOARD:
Junction to Ambient (θJA)41°C/W
Junction to Case (θJC)8.5°C/W
(VIN = +4.5 to +60V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VIN = +24V, TA= +25°C, RSETI = 1.5kΩ.)
(Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
IN Voltage Range VIN 4.5 60 V
Shutdown Input Current ISHDN VEN = 0V 25 60 μA
Shutdown Output Current IOFF VEN = 0V, VOUT = 0V -2 µA
Reverse Input Current IIN_RVS VIN = -60V, VOUT = 0V -85 -50 µA
Supply Current IIN VIN = 24V, VEN = 5V 0.88 1.20 mA
Internal Undervoltage-Trip Level VUVLO
VIN rising 3.46 4.02 4.45 V
VIN falling 3.5
UVLO, OVLO Reference VREF 1.45 1.50 1.55 V
UVLO, OVLO Threshold
Hysteresis 3.3 %
UVLO, OVLO Leakage Current ILEAK VUVLO = VOVLO = 0 to 2V. (MAX17608,
MAX17609 only) -100 100 nA
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.
For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Package Information
Electrical Characteristics
www.maximintegrated.com Maxim Integrated
3
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
(VIN = +4.5 to +60V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VIN = +24V, TA= +25°C, RSETI = 1.5kΩ.)
(Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OVLO Adjustment Range (Note 4) 5.5 60 V
UVLO Adjustment Range (Note 4) 4.5 59 V
Internal POR 3.0 4.3 V
INTERNAL FETs
Internal FETs On-Resistance RON ILOAD = 100mA, VIN 8V 260 490
Current-Limit Adjustment Range ILIM (Note 5) 0.1 1 A
Current-Limit Accuracy 100mA ≤ ILIM ≤ 200mA -5 +5 %
200mA ≤ ILIM ≤ 1.0A -3 +3
FLAG Assertion Drop-Voltage
Threshold VFA Increase (VIN - VOUT) drop until FLAG
asserts, VIN = 24V, IIN = 10mA 370 470 570 mV
Reverse Current-Blocking
Slow Threshold VRIBS (VOUT - VIN). (MAX17608, MAX17610
only) 211 20 mV
Reverse Current-Blocking
Debounce Blanking Time tDEBRIB (MAX17608, MAX17610 only) 100 140 180 μs
Reverse Current-Blocking
Powerup Blanking Time tBLKRIB (MAX17608, MAX17610 only) 14.4 16.0 17.6 ms
Reverse Current-Blocking
Fast Threshold VRIBF (VOUT -VIN). (MAX17608, MAX17610
only) 70 105 140 mV
Reverse Current-Blocking
Fast-Response Time tRIB IREVERSE = 20A, (MAX17608,
MAX17610 only) (Note 6) 150 230 ns
Reverse-Blocking Supply
Current IRBL Current into OUT when (VOUT - VIN) >
130mV. (MAX17608, MAX17610 only) 0.89 1.25 mA
SETI
RSETI × ILIM VRI 1.5 V
Current-Mirror Output Ratio CIRATIO 100mA ≤ IIN ≤ 200mA 950 1000 1050 A/A
200mA ≤ IIN ≤ 1.0A 970 1000 1030
Internal SETI Clamp 5mA into SETI 1.6 2.2 V
SETI Leakage Current VSETI = 1.6V -0.1 0.1 μA
LOGIC INPUT
EN Input-Logic High VIH 1.4 V
EN Input-Logic Low VIL 0.4 V
EN Pullup Voltage EN pin unconnected. VIN = 60V 2 V
EN Input Current VEN = 5.5V 60 92 μA
EN Pullup Current VEN = 0.4V 1.0 3.0 8.0 μA
CLMODE Input-Logic High 2.0 3.8 4.9 V
CLMODE Input-Logic Low 0.25 0.60 0.95 V
CLMODE Pullup Input Current 8 10 12 µA
Electrical Characteristics (continued)
www.maximintegrated.com Maxim Integrated
4
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
(VIN = +4.5 to +60V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VIN = +24V, TA= +25°C, RSETI = 1.5kΩ.)
(Note 3)
Note 3: All devices are 100% production tested at TA = +25°C. Limits over the operating-temperature range are guaranteed by
design; not production tested.
Note 4: User settable. See the Overvoltage Lockout (OVLO) and Undervoltage Lockout (UVLO) sections for instructions.
Note 5: The current limit can be set below 100mA with a decresed accuracy.
Note 6: Guaranteed by design; not production tested.
Note 7: The ratio between autoretry time and blanking time is fixed and equal to 15.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
FLAG, UVOV, FWD, REV OUTPUTs
FLAG, UVOV, FWD, REV
Output-Logic Low Voltage ISINK = 1mA 0.4 V
FLAG, UVOV, FWD, REV
Output-Leakage Current
VIN = VFLAG = VUVOV = VFWD = VREV
= 5.5V. FLAG, UVOV, FWD and REV
pins are deasserted
1μA
TIMING CHARACTERISTICS
Switch Turn-On Time tON_
SWITCH
VIN = 24V, RLOAD = 1kΩ, CLOAD = 0pF,
RSETI = 1.5kΩ 1.0 1.5 ms
Overvoltage Switch Turn-Off
Time tOFF_OVP
VOVLO exceeds VREF as a step;
RLOAD = 1kΩ 1.0 1.5 µs
Overvoltage Falling-Edge
Debounce Time tDEB_OVP 20 μs
Overcurrent Protection Re-
sponse Time tOCP_RES
ILIM = 1A, CLOAD = 0, IOUT step from
0.5A to 1.5A. Time to regulate IOUT to
current limit.
100 μs
IN Debounce Time tDEB
From VIN_UVLO < VIN < VIN_OVLO
and EN = High to VOUT = 10% of VIN.
Elapses only at power-up.
14.4 16 17.6 ms
Current-Limit Smooth-Transition
Time tREF_RAMP 100 μs
Current-Limit Blanking Time tBLANK 36 40 44 ms
Current-Limit Autoretry Time tRETRY After blanking time from IOUT > ILIM to
FLAG deasserted (Note 7) 540 600 660 ms
THERMAL PROTECTION
Thermal Shutdown TJ160 °C
Thermal Shutdown Hysteresis TJ(HYS) 28 °C
Electrical Characteristics (continued)
www.maximintegrated.com Maxim Integrated
5
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
(CIN = 0.47μF, COUT = 4.7μF, VIN = +24V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
0.70
0.75
0.80
0.85
0.90
0.95
1.00
412 20 28 36 44 52 60
SUPPLY CURRENT (mA)
SUPPLY VOLTAGE (V)
IN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
toc01
T
A
= +25
°
C
T
A
= +125
°
C
T
A
= -40
°
C
SETI UNCONNECTED
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
-50 -25 025 50 75 100 125 150
NORMALIZED ON-RESISTANCE
TEMPERATURE (°C)
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
V
IN
= +24V
toc04
0.90
0.92
0.94
0.96
0.98
1.00
1.02
1.04
1.06
1.08
1.10
-50 -25 025 50 75 100 125 150
NORMALIZED OVLO THRESHOLD
TEMPERATURE (°C)
NORMALIZED OVLO THRESHOLD
vs. TEMPERATURE
toc07
NORMALIZED TO
T
A
= +25
°
C
V
IN
= +24V
0.70
0.75
0.80
0.85
0.90
0.95
1.00
-50 -25 025 50 75 100 125 150
SUPPLY CURRENT (mA)
TEMPERATURE (°C)
IN SUPPLY CURRENT
vs. TEMPERATURE
toc02
SETI UNCONNECTED
V
IN
= +24V
0.95
0.96
0.97
0.98
0.99
1.00
1.01
1.02
1.03
1.04
1.05
412 20 28 36 44 52 60
NORMALIZED CURRENT LIMIT
SUPPLY VOLTAGE (V)
NORMALIZED CURRENT LIMIT
vs. SUPPLY VOLTAGE
toc05
NORMALIZED TO
V
IN
= +24V
R
SETI
= 1.5kΩ
0.90
0.92
0.94
0.96
0.98
1.00
1.02
1.04
1.06
1.08
1.10
-50 -25 025 50 75 100 125 150
NORMALIZED UVLO THRESHOLD
TEMPERATURE (°C)
NORMALIZED UVLO THRESHOLD
vs. TEMPERATURE
toc08
NORMALIZED TO
T
A
= +25
o
C
V
IN
= +24V
0.90
0.95
1.00
1.05
1.10
412 20 28 36 44 52 60
NORMALIZED ON-RESISTANCE
SUPPLY VOLTAGE (V)
NORMALIZED ON-RESISTANCE
vs. SUPPLY VOLTAGE
toc03
NORMALIZED TO
V
IN
= 24V
I
OUT
= 100mA
0.97
0.98
0.99
1.00
1.01
1.02
1.03
-50 -25 025 50 75 100 125 150
NORMALIZED CURRENT LIMIT
TEMPERATURE (°C)
NORMALIZED CURRENT LIMIT
vs. TEMPERATURE
toc06
NORMALIZED TO
T
A
= +25
°
C
V
IN
= +24V
R
SETI
= 1.5kΩ
0
5
10
15
20
25
30
35
40
45
50
-50 -25 025 50 75 100 125 150
SHUTDOWN SUPPLY CURRENT (µA)
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT vs.
TEMPERATURE
toc09
V
IN
= +24V
EN = LOW
OUT = GND
Maxim Integrated
6
www.maximintegrated.com
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
7 , vW = .zw
(CIN = 0.47μF, COUT = 4.7μF, VIN = +24V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
-30
-28
-26
-24
-22
-20
-18
-16
-14
-12
-10
-50 -25 025 50 75 100 125 150
SHUTDOWN REVERSE CURRENT (µA)
TEMPERATURE (°C)
SHUTDOWN REVERSE
CURRENT vs. TEMPERATURE
toc10
V
IN
= -24V
EN = LOW
OUT = GND
0.0
0.2
0.4
0.6
0.8
1.0
0 2 4 6 8 10 12 14 16
CURRENT LIMIT (A)
R
SETI
(k)
CURRENT LIMIT vs. RSETI
toc13
V
IN
= +24V
15.0
15.5
16.0
16.5
17.0
17.5
18.0
-50 -25 025 50 75 100 125 150
DEBOUNCE TIME (ms)
TEMPERATURE (°C)
SWITCH DEBOUNCE TIME vs. TEMPERATURE
toc11
V
IN
= +24V
POWER-UP RESPONSE
20V/div
4ms/div
V
IN
V
OUT
20V/div
toc14
V
UVOV
5V/div
I
IC
100mA/div
0
10
20
30
40
50
60
70
80
90
100
-50 -25 025 50 75 100 125 150
TURN-OFF TIME (μs)
TEMPERATURE (°C)
SWITCH TURN-OFF TIME vs. TEMPERATURE
toc12
V
IN
= +24V, C
L
= 10μF
EN TRANSITION TO I
OUT
FALLING
TO 10% OF INITIAL VALUE
REVERSE-BLOCKING RESPONSE
20V/div
10µs/div
V
IN
V
OUT
I
OUT
20V/div
1A/div
V
FLAG
5V/div
toc15
24V
24V
35V
Maxim Integrated
7
www.maximintegrated.com
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
“may _J_JL_L_ mnmssuw
(CIN = 0.47μF, COUT = 4.7μF, VIN = +24V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
toc16
2ms/div
V
OUT
V
FLAG
THERMAL SHUTDOWN DUE TO
OUTPUT SHORT CIRCUIT
V
IN
1A/div
20V/div
20V/div
5V/div
I
OUT
toc19
200ms/div
V
OUT
I
OUT
AUTORETRY TIME (tRETRY)
500mA/div
20V/div
AUTORETRY MODE
I
LIM
= 0.5A
V
FLAG
5V/div
toc17
10ms/div
V
OUT
I
OUT
OUTPUT SHORT CIRCUIT RESPONSE
V
IN
500mA/div
20V/div
20V/div
I
LIM
= 0.5A
5V/div
V
FLAG
990
995
1000
1005
1010
1015
1020
0.0 0.2 0.4 0.6 0.8 1.0 1.2
CURRENT SENSE RATIO
INPUT CURRENT (A)
CURRENT SENSE RATIO
vs. INPUT CURRENT
toc20
V
IN
= +24V
toc18
100ms/div
V
OUT
I
OUT
CURRENT-LIMIT RESPONSE
V
IN
1A/div
20V/div
20V/div
I
LIM
= 1A,
I
L
= 100mA TO SHORT ON OUT WITH 1A/s
V
FLAG
5V/div
Maxim Integrated
8
www.maximintegrated.com
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Pin Configurations
IN OUT
+
IN OUT
UVOV
GND
OVLO
UVLO
EN
CLMODE
SETI
FLAG
TDFN-EP
(3mm x 3mm)
TOP VIEW
1
2
3
4
5
6
12
11
7
9
8
MAX17608
MAX17609
10
*EP
IN OUT
+
IN OUT
REV
GND
N.C.
N.C.
EN
CLMODE
SETI
FWD
TDFN-EP
(3mm x 3mm)
TOP VIEW
1
2
3
4
5
6
12
11
7
9
8
MAX17610
10
*EP
MAX17608, MAX17609
MAX17610
www.maximintegrated.com Maxim Integrated
9
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
PIN
NAME FUNCTION
MAX17608,
MAX17609 MAX17610
1–2 1–2 IN Input Pins. Connect a low-ESR ceramic capacitor to GND. For Hot Plug-In applications,
see the Applications Information section.
3OVLO OVLO Adjustment. Connect resistive potential divider from IN to GND to set the OVLO
threshold.
4 UVLO UVLO Adjustment. Connect resistive potential divider from IN to GND to set the UVLO
threshold.
3–4 N.C. Not Connected. Leave unconnected.
5 5 EN Active-High Enable Input. Internally pulled up to 1.8V.
6 6 CLMODE
Current-Limit Mode Selector. Connect CLMODE to GND for Continuous mode.
Connect a 150kΩ resistor between CLMODE and GND for Latch-off mode. Leave
CLMODE unconnected for Autoretry mode.
7 7 GND Ground.
8 8 SETI Overcurrent Limit Adjustment Pin and Current Monitoring Output. Connect a resistor from
SETI to GND to set overcurrent limit. See the Setting Current-Limit Threshold section.
9 FLAG
Open-Drain, Fault Indicator Output. FLAG goes low when:
Overcurrent duration exceeds the blanking time.
Reverse current is detected (MAX17608 only).
Thermal shutdown is active.
RSETI is less than 1kΩ (max).
9 FWD
Open-Drain, Fault Indicator Output. FWD goes low when:
Overcurrent duration exceeds the blanking time.
Thermal shutdown is active.
RSETI is less than 1kΩ (max).
10 UVOV
Open-Drain, Fault Indicator Output. UVOV goes low when:
Input voltage falls below UVLO threshold.
Input voltage rises above OVLO threshold.
10 REV Open-Drain, Fault Indicator Output. REV goes low when reverse current is detected.
11–12 11–12 OUT Output Pins. For a long output cable or inductive load, see the Applications Information
section.
— EP
Exposed Pad. Connect EP to a large GND plane with several thermal vias for best
thermal performance. Refer to the MAX17608 EV kit data sheet for a reference layout
design.
Pin Description
www.maximintegrated.com Maxim Integrated
10
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Functional Diagrams
HV FET
CONTROL
CURRENT
REGULATION
1.5V
OVLO
UVLO
EN
UVOV
OUT
IN
1.8V
SETI
IFET/CIRATIO
IFET
THERMAL
SHUTDOWN
IN
CONTROL
LOGIC
GND
REVERSE
PROTECTION
1.5V
OUT
CLMODE
FLAG
1.5V
(MAX17608 Only)
Q1Q2
IFET/CIRATIO
MAX17608-MAX17609
www.maximintegrated.com Maxim Integrated
11
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Functional Diagrams (continued)
HV FET
CONTROL
CURRENT
REGULATION
1.5V
EN
REV
OUT
IN
1.8V
SETI
IFET/CIRATIO
IFET
THERMAL
SHUTDOWN
IN
CONTROL
LOGIC
GND
REVERSE
PROTECTION
OUT
CLMODE
FWD
Q1Q2
IFET/CIRATIO
MAX17610
www.maximintegrated.com Maxim Integrated
12
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Detailed Description
The MAX17608/MAX17609/MAX17610 overvoltage- and
overcurrent-protection devices offer adjustable protection
boundaries for systems against input positive and negative
faults up to +60V and -65V, and output load current up to
1A. The devices feature two internal MOSFETs connected
in series with a low cumulative RON of 260mΩ (typ).The
devices block out negative input voltages completely.
Input undervoltage protection can be programmed
between 4.5V and 59V, while the overvoltage protection
can be independently programmed between 5.5V and
60V. Additionaly, the devices have an internal default
undervoltage lockout set at 4V (typ).
The devices are enabled or disabled through the EN pin
by a master supervisory system; hence, offering a switch
operation to turn on or turn off power delivery to con-
nected load.
The current through the devices is limited by setting
a current limit, which is programmed by a resistor connected
from SETI to GND. The current limit can be programmed
between 0.1A to 1A. When the device current reaches
or exceeds the set current limit, the on-resistance of
the internal FETs are modulated to limit the current to
set limits. The devices offer three different behavioral
models when under current limited operations: Autoretry,
Continuous, and Latch-Off modes. The SETI pin also
presents a voltage with reference to GND, which under
normal operation is proportional to the device current. The
voltage appearing on the SETI pin is read by an ADC on
the monitoring system for recording instantaneous device
current. To avoid oscillation, do not connect more than
10pF to the SETI pin.
The devices offer communication signals to indicate different
operational and fault signals. MAX17608 and MAX17609
offer FLAG and UVOV signals, while MAX17610 offers
FWD and REV signals. All communication signal pins are
open drain in nature and require external pullup resistors
to appropriate system interface voltage.
MAX17608 and MAX17610 block reverse current flow
(from OUT to IN) while MAX17609 allows reverse current
flow.
All three devices offer internal thermal shutdown protection
against excessive power dissipation.
Undervoltage Lockout (UVLO)
MAX17608 and MAX17609 have a UVLO adjustment
range from 4.5V to 59V. Connect an external resistive
potential divider to the UVLO pin as shown in the Typical
Operating Circuits to adjust the UVLO threshold voltage.
Use the following equation to adjust the UVLO threshold.
The recommended value of R1 is 2.2MΩ.
UVLO REF R1
V V1
R2

= ×+


where VREF = 1.5V.
All three devices have an input UVLO threshold set at 4V
(typ). MAX17610 has no UVLO pin to adjust the UVLO
threshold voltage externally.
Overvoltage Lockout (OVLO)
MAX17608 and MAX17609 devices have an OVLO
adjustment range from 5.5V to 60V. Connect an external
resistive potential divider to the OVLO pin as shown in the
Typical Operating Circuits to adjust the OVLO threshold
voltage. Use the following equation to adjust the OVLO
threshold. The recommended value of R3 is 2.2MΩ.
OVLO REF R3
V V1
R4

= ×+


where VREF = 1.5V.
The MAX17610 device has no OVLO pin to adjust the
OVLO threshold voltage.
The OVLO reference voltage (VREF) is set at 1.5V. If the
voltage at the OVLO pin exceeds VREF for time equal
to the overvoltage switch turn-off time (tOFF_OVP), the
switch is turned off and UVOV is asserted. When the
OVLO condition is removed, the device takes the over-
voltage falling-edge debounce time (tDEB_OVP) to start
the switch turn-on process. The switch turns back on after
switch turn-on time (tON_SWITCH) and UVOV is deas-
serted. Figure 1 depicts typical behavior in overvoltage
conditions.
Figure 1. Overvoltage-Fault Timing Diagram
1.5V
OVLO
NOTE: TIME NOT IN SCALE
t
DEB_OVP
t
ON_SWITCH
UVOV
t
OFF_OVP
SWITCH
STATUS
TIME
www.maximintegrated.com Maxim Integrated
13
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Input Debounce Protection
The devices feature input debounce protection. The
devices start operation (turn on the internal FETs) only
if the input voltage is higher than UVLO threshold for a
period greater than the debounce time (tDEB). The tDEB
elapses only at power-up of the devices. This feature is
intended for applications where the EN signal is present
when the power supply ramps up. Figure 2 depicts a typi-
cal debounce timing diagram.
Enable
The devices are enabled or disabled through the EN pin
by driving it above or below the EN threshold voltage.
Hence the devices can be used to turn on or off power
delivery to connected loads using the EN pin.
Setting Current-Limit Threshold
Connect a resistor between SETI and GND to program
the current-limit threshold in the devices. Use the following
equation to calculate current-limit setting resistor:
SETI
LIM
1500
R (k ) I (mA)
Ω=
where ILIM is the desired current limit in mA.
Do not use a RSETI smaller than 1.5kΩ. Table 1 shows
current-limit thresholds for different resistor values.
The devices feature read-out of the current flowing into
the IN pin. A current mirror, with a ratio of CIRATIO, is
implemented, using a current-sense auto-zero opera-
tional amplifier. The mirrored current flows out through
the SETI pin, into the external current-limit resistor. The
voltage on the SETI pin provides information about the IN
current with the following relationship:
SETI
IN OUT
SETI
V (V)
I (A) R (k )
=
If SETI is left unconnected, VSETI 1.5V. The current
regulator does not allow any current to flow. During
startup, this causes the switches to remain off and FLAG
(or FWD) to assert after tBLANK elapses. During startup,
270μA current is forced to flow through RSETI. If the volt-
age at SETI is below 150mV, the switches remain off and
FLAG (or FWD) asserts.
Current-Limit Type Select
The CLMODE pin is used to program the overcurrent
response of the devices in one of the following three modes:
Autoretry mode (CLMODE pin is left unconnected),
Continuous mode (CLMODE pin is connected to GND),
Latch-off mode (a 150kΩ resistor is connected between
CLMODE and GND).
RSETI (kΩ) CURRENT LIMIT (A)
15 0.10
50.30
30.50
2 0.75
1.5 1.00
Table 1. Current-Limit Threshold
vs. SETI-Resistor Values
Figure 2. Debounce Timing Diagram
V
IN
UVLO
<t
DEB
<t
DEB
OFF
ON
SWITCH
STATUS
OVLO
NOTE: TIME NOT IN SCALE
t
DEB
TIME
www.maximintegrated.com Maxim Integrated
14
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Autoretry Current Limit
In autoretry current-limit mode, when current through the
device reaches the current-limit threshold, the tBLANK
timer begins counting. The FLAG (or FWD) pin asserts if
the overcurrent condition is present for tBLANK. The timer
resets if the overcurrent condition resolves before tBLANK
has elapsed. A retry time delay (tRETRY) starts immedi-
ately after tBLANK has elapsed. During tRETRY time, the
switch remains off. Once tRETRY has elapsed, the switch
is turned back on again. If the fault still exists, the cycle
is repeated and FLAG (or FWD) pin remains asserted. If
the overcurrent condition is resolved, the switch stays on.
The autoretry feature reduces system power in case of
overcurrent or short-circuit conditions. When the switch
is on during tBLANK time, the supply current is held at
the current limit. During tRETRY time, there is no current
through the switch. Thus, output current is much less
than the programmed current limit. Calculate the average
output current using the following equation:
BLANK
LOAD LIM
RETRY BLANK
t
II
tt

=

+

With a 40ms (typ) tBLANK and 600ms (typ) tRETRY, the
duty cycle is 6.25%, resulting in a 93.75% power reduc-
tion when compared to the switch being on the entire
time. Figure 3 depicts typical behavior in the autoretry
current-limit mode.
Continuous Current Limit
In continuous current-limit mode, when current through
the device reaches the current limit threshold, the device
limits output current to the programmed current limit.
The FLAG (or FWD) pin asserts if overcurrent condition
is present for tBLANK and deasserts when the overload
condition is removed. Figure 4 depicts typical behavior in
the continuous current-limit mode.
Figure 3. Autoretry Fault-Timing Diagram
Figure 4. Continuous Fault-Timing Diagram
OUT
CURRENT LIMIT
LOAD CURRENT
FLAG
AUTORETRY MODE
DEVICE GOES TO
THERMAL SHUTDOWN MODE
DEVICE COMES OUT OF
THERMAL SHUTDOWN MODE
NOTE: TIME NOT IN SCALE
t
BLANK
t
BLANK
t
BLANK
t
RETRY
t
RETRY
t
RETRY
(OR FWD)
TI ME
OUT
CURRENT LIMIT
LOAD CURRENT
FLAG
CONTINUOUS MODE
DEVICE GOES TO
THERMAL SHUTDOWN MODE
NOTE: TIME NOT IN SCALE
t
BLANK
DEVICE COMES OUT OF
THERMAL SHUTDOWN MODE
(OR FWD)
TI ME
www.maximintegrated.com Maxim Integrated
15
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Latch-Off Current Limit
In latch-off current-limit mode, when current through the
device reaches the current-limit threshold, the tBLANK
timer begins counting. The FLAG (or FWD) pin asserts if
an overcurrent condition is present for tBLANK. The timer
resets when the overcurrent condition disappears before
tBLANK has elapsed. The switch turns off and stays off if
the overcurrent condition continues beyond tBLANK. To
reset the switch, either toggle the control logic (EN) or
cycle the input voltage. Figure 5 depicts typical behavior
in latch-off current-limit mode.
Reverse Current Protection
In MAX17608 and MAX17610, the reverse current-pro-
tection feature is enabled and it prevents reverse current
flow from OUT to IN pins. In MAX17609, the reverse cur-
rent-protection feature is disabled, which allows reverse
current flow from the OUT to IN pins. This feature is useful
in applications with inductive loads.
In MAX17608 and MAX17610 devices, two different
reverse-current features are implemented. A slow reverse-
current condition is detected if (VIN - VOUT) < VRIBS is
present for reverse current-blocking debounce blanking
time (tDEBRIB). Only the input NFET (Q1) is turned off
and the FLAG (or REV) pin is asserted while the output
NFET (Q2) is kept on. During and after this time, the
device monitors the voltage difference between the OUT
and IN pins to determine whether the reverse current is
still present. Once the reverse current condition has been
removed, Q1 is turned back on and the FLAG (or REV)
pin is deasserted. Q1 takes tQ1_ON (~100μs) time to turn
on. Figure 6 depicts typical behavior in slow reverse cur-
rent conditions.
A fast reverse-current condition is detected if (VIN - VOUT)
< VRIBF is present for reverse current blocking fast
response time (tRIB). Only the input NFET (Q1) is turned
off and the FLAG (or REV) pin is asserted while the out-
put NFET (Q2) is kept on. During and after this time, the
device monitors the voltage difference between the OUT
and IN pins to determine whether the reverse current is
still present. Once the reverse current condition has been
removed, Q1 is turned back on and the FLAG (or REV)
pin is deasserted. Q1 takes tQ1_ON (~100μs) time to
turn on. Figure 7 depicts typical behavior in fast reverse-
current condition.
The device contains two reverse-current thresholds with
slow (< 140μs) and fast (< 150ns) response time for
reverse protection. The thresold values for slow reverse
is 11mV (typ) whereas for fast reverse, it is 105mV (typ).
This feature results in robust operation in a noisy environ-
ments, while still delivering fast protection for severe fault,
such as input short-circuit or hot plug-in at the OUT pins.
Figure 5. Latch-Off Fault-Timing Diagram
OUT
CURRENT LIMIT
LOAD CURRENT
FLAG
LATCH-OFF MODE
DEVICE GOES TO
THERMAL SHUTDOWN
MODE AND LATCHES OFF
DEVICE LATCHES OFF
NOTE: TIME NOT IN SCALE
t
BLANK
t
BLANK
t
DEB
INPUT OR EN CYCLE
(OR FWD)
TI ME
www.maximintegrated.com Maxim Integrated
16
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Figure 6. Slow Reverse-Current Fault-Timing Diagram
Figure 7. Fast Reverse-Current Fault-Timing Diagram
V
RIBS
(V
IN
-V
OUT
)
0V
0A
I
LOAD
-(V
RIBS
/R
ON
)
Q1 SWITCH
STATUS
NOTE: TIME NOT IN SCALE
t
DEBRIB
t
Q1_ON
FLAG
t
DEBRIP
TIME
V
RIBS
(V
IN
-V
OUT
)
0V
0A
I
LOAD
-(V
RIBS
/R
ON
)
NOTE: TIME NOT IN SCALE
t
DEBRIB
Q1 SWITCH
STATUS
t
Q1_ON
FLAG
t
RIB
TIME
V
RIBF
-(V
RIBF
/R
ON
)
www.maximintegrated.com Maxim Integrated
17
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Fault Output
MAX17608 and MAX17609 devices have two open-drain
fault outputs, FLAG and UVOV. They require external pullup
resistors to a DC supply. The FLAG pin goes low when
any of the following conditions occur:
Overcurrent duration exceeds blanking time.
Reverse current is detected (MAX17608 only).
Thermal shutdown is active.
● RSETI is less than 1kΩ (max).
The other fault output UVOV goes low when input voltage
falls below UVLO threshold or rises above OVLO thresh-
old. Note that the UVLO fault has a debounce time of
16ms. This fault is removed 16ms after input voltage has
crossed the UVLO threshold. This debounce also elapses
only at powerup. As a consequence, the UVOV pin fault
signal is always asserted at power-up for at least 16ms.
The MAX17610 device has two open-drain fault outputs,
FWD and REV. They require external pullup resistors to
a DC supply. FWD goes low when any of the following
conditions occur:
Overcurrent duration exceeds the blanking time.
Thermal shutdown is active.
● RSETI is less than 1kΩ (max).
REV goes low when reverse current is detected.
Thermal Shutdown Protection
The devices have a thermal shutdown feature to protect
against overheating. The devices turn off and the FLAG
(or FWD) pin asserts when the junction temperature
exceeds +160°C (typ). The devices exit thermal shutdown
and resume normal operation after the junction tempera-
ture cools down by 28°C (typ), except when in latchoff
mode, the devices remain latched off.
The thermal limit behaves similarly to the current limit. In
autoretry mode, the thermal limit works with the autoretry
timer. When the junction temperature falls below the fall-
ing thermal-shutdown threshold, devices turn on after the
retry time. In latch-off mode, the devices latch off until
power or EN is cycled. In continuous mode, the devices
only disable while the temperature is over the limit. There
is no blanking time for thermal protection. Figure 3, Figure
4, and Figure 5 depict typical behavior under different cur-
rent limit modes.
Applications Information
IN Capacitor
A 0.47μF capacitor from the IN pin to GND is recomended
to hold input voltage during sudden load-current changes.
Hot Plug-In at IN Terminal
In many system powering applications, an input-filtering
capacitor is required to lower radiated emission and
enhance ESD capability. In hot plug-in applications,
parasitic cable inductance along with the input capacitor
causes overshoot and ringing when a live power cable is
connected to the input terminal.
This effect causes the protection device to see almost
twice the applied voltage. A transient voltage suppressor
(TVS) is often used in industrial applications to protect
the system from these conditions. A TVS that is capable
of limiting surge voltage to maximum 60V shall be placed
close to the input terminal for enhanced protection. The
maximum tolerated slew rate at the IN pins is 100V/μs.
Input Hard Short to Ground
In many system applications, an input short-circuit protec-
tion is required. The MAX17608 and MAX17610 devices
detect reverse current entering at the OUT pin and flowing
out of the IN pin and turn off the internal FETs. The mag-
nitude of the reverse current depends on the inductance
of input circuitry and any capacitance installed near the
IN pins.
The devices can be damaged in case VIN goes so nega-
tive that (VOUT - VIN) > 60V.
OUT Capacitor
The maximum capacitive load (CMAX) that can be connected
is a function of current-limit setting (ILIM in mA), the blank-
ing time (tBLANK in ms) and the input voltage. CMAX is
calculated using the following relationship:
LIM BLANK(TYP)
MAX IN
I (mA) t (ms)
C ( F) V (V)
×
µ=
For example, for VIN = 24V, tBLANK(TYP) = 40ms, and
ILIM = 1A, CMAX is 1666μF.
Output capacitor values in excess of CMAX can trigger
false overcurrent conditions. Note that the above expres-
sion assumes no load current is drawn from the OUT pins.
Any load current drawn would offset the capacitor charg-
ing current resulting in a longer charging period; hence,
the possibility of a false overcurrent condition.
www.maximintegrated.com Maxim Integrated
18
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
Hot Plug-In at OUT Terminal
In some applications, there might be a possibility of apply-
ing an external voltage at the OUT terminal of the devices
with or without the presence of an input voltage. During
these conditions, devices detect any reverse current enter-
ing at the OUT pin and flowing out of the IN pin and turn
off the internal FETs. Parasitic cable inductance along
with input and output capacitors, cause overshoot and
ringing when an external voltage is applied at the OUT
terminal. This causes the protection devices to see up to
twice the applied voltage, which can damage the devices.
It is recommended to maintain overvoltages such that the
voltages at the pins do not exceed the absolute maximum
ratings. The maximum tolerated slew rate at OUT pins is
100V/μs.
Output Freewheeling Diode for Inductive Hard
Short to Ground
In applications that require protection from a sudden short
to ground with an inductive load or a long cable, a schottky
diode between the OUT terminal and gro und is recom-
mended. This is to prevent a negative spike on the OUT
due to the inductive kickback during a short-circuit event.
Layout and Thermal Dissipation
To optimize the switch response time to output short-circuit
conditions, it is very important to keep all traces as short
as possible to reduce the effect of undesirable parasitic
inductance. Place input and output capacitors as close as
possible to the device (no more than 5mm). IN and OUT
must be connected with wide short traces to the power
bus. During normal operation, the power dissipation is
small and the package temperature change is minimal.
Power dissipation under steady-state normal operation is
calculated as:
2
(SS) ON
OUT
PIR
= ×
Refer to the Electrical Characteristics table and Typical
Operating Characteristics for RON values at various oper-
ating temperatures.
If the output is continuously shorted to ground at the
maximum supply voltage, the switches with the autoretry
option do not cause thermal shutdown detection to trip.
Power dissipation in the devices operating in autoretry
mode is calculated using the following equation:
IN(MAX) OUT(MAX) BLANK
(MAX)
RETRY BLANK
VI t
Ptt
××
=+
Attention must be given to continuous current-limit mode
when the power dissipation during a fault condition can
cause the device to reach the thermal-shutdown threshold.
Thermal vias from the exposed pad to ground plane are
highly recommended to increase the system thermal capac-
itance while reducing the thermal resistance to the ambient.
ESD Protection
All the pins have a ±2kV (HBM) typical ESD protection.
Figure 8 shows the HBM, and Figure 9 shows the current
waveform it generates when discharged into low imped-
ance. This model consists of a 100pF capacitor charged to
the ESD voltage of interest, which is then discharged into
the device through a 1.5kΩ resistor.
Figure 8. Human Body ESD Test Model
Figure 9. Human Body Current Waveform
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
R
C
1MΩ
R
D
1.5kΩ
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTOR
STORAGE
CAPACITOR
TIME
t
DL
CURRENT WAVEFORM
I
P
100%
90%
36.8%
10%
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
t
RL
AMPERES
I
R
0
0
www.maximintegrated.com Maxim Integrated
19
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
PART TEMP RANGE PIN PACKAGE FEATURE DIFFERENCES
MAX17608ATC+T -40°C to +125°C 12 TDFN-EP* OV, UV, Reverse Voltage Protection
MAX17609ATC+T -40°C to +125°C 12 TDFN-EP* OV, UV
MAX17610ATC+T -40°C to +125°C 12 TDFN-EP* Reverse Voltage Protection
+Denotes a lead(Pb)-free/RoHS-compliant package.
T Denotes tape-and-reel.
*EP = Exposed Pad
Ordering Information
www.maximintegrated.com Maxim Integrated
20
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 12/17 Initial release
1 6/18
Updated title, General Description, Benefits and Features and Typical Operating
Characteristics sections, and Electrical Characteristics and Ordering Information
tables.
1–24
Revision History
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2018 Maxim Integrated Products, Inc.
21
MAX17608/MAX17609/
MAX17610
4.5V to 60V, 1A Current Limiter
with OV, UV, and Reverse Protection
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

Products related to this Datasheet

EVAL KIT OVP/OVC 1A MAX17610
Available Quantity: 2
Unit Price: 47.49
IC 1A OVP/OVC REV PROTECT TDFN
Available Quantity: 0
Unit Price: 6.02
EVAL KIT OVP/OVC 1A MAX17608
Available Quantity: 0
Unit Price: 50.32
IC 1A OVP/OVC REV PROTECT TDFN
Available Quantity: 0
Unit Price: 5.26
EVAL KIT OVP/OVC 1A MAX17609
Available Quantity: 0
Unit Price: 50.32
IC 1A OVP/OVC REV PROTECT TDFN
Available Quantity: 0
Unit Price: 0
INDUSTRIAL 1A OVER-CURRENT AND O
Available Quantity: 0
Unit Price: 3.40943
INDUSTRIAL 1A OVER-CURRENT AND O
Available Quantity: 0
Unit Price: 2.9751
INDUSTRIAL 1A OVER-CURRENT AND O
Available Quantity: 0
Unit Price: 2.5625
INDUSTRIAL 1A OVER-CURRENT AND O
Available Quantity: 0
Unit Price: 4.53
INDUSTRIAL 1A OVER-CURRENT AND O
Available Quantity: 0
Unit Price: 4.53