AP3428(A) Datasheet by Diodes Incorporated

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AP3428/A
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AP3428/A
1.5MHZ, 1A STEP-DOWN DC-DC BUCK CONVERTER
Description
The AP3428/A is a 1A step-down DC-DC converter. At heavy load,
the constant-frequency PWM control performs excellent stability and
transient response. No external compensation components are
required.
The AP3428/A supports a range of input voltages from 2.5V to 5.5V,
allowing the use of a single Li+/Li-polymer cell, multiple Alkaline/NiMH
cell, and other standard power sources. The output voltage is
adjustable from 0.6V to the input voltage. The AP3428/A employs
internal power switch and synchronous rectifier to minimize external
part count and realize high efficiency. During shutdown, the input is
disconnected from the output and the shutdown current is less than
1μA. Other key features include over-temperature and short circuit
protection, and under-voltage lockout to prevent deep battery
discharge.
The AP3428/A delivers 1A maximum output current while consuming
only 40μA of no-load quiescent current. Ultra-low RDS(ON) integrated
MOSFETs and 100% duty cycle operation make the AP3428/A an
ideal choice for high output voltage, high current applications which
require a low dropout threshold. Pulse skip mode allows to maintain
high efficiency at light-load conditions.
The AP3428/A is available in TSOT25, TSOT25 (Type SM), U-
DFN2020-6 (Type J) packages.
Features
Output Current: Up to 1A
Output Voltage: 0.6V to VIN
Input Voltage: 2.5V to 5.5V
0.6V Reference Voltage with ±2% Precision
40µA (typ) No Load Quiescent Current
Shutdown Current: <1µA
100% Duty Cycle Operation
1.5MHz Switching Frequency
Internal Soft Start
No External Compensation Required
Current Limit Protection
Thermal Shutdown
TSOT25, TSOT25 (Type SM), U-DFN2020-6 (Type J) Packages
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
For automotive applications requiring specific change
control (i.e. parts qualified to AEC-Q100/101/200, PPAP
capable, and manufactured in IATF 16949 certified facilities),
please contact us or your local Diodes representative.
https://www.diodes.com/quality/product-definitions/
Pin Assignments
(Top View)
TSOT25/TSOT25 (Type SM) for AP3428
(Top View)
TSOT25/TSOT25 (Type SM) for AP3428A
(Top View)
U-DFN2020-6 (Type J)
Applications
Post DC-DC Voltage Regulation
Set Top Boxes
Notebook Computer
PAD
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and
Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
m5” AP3428/A
AP3428/A
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AP3428/A
Typical Applications Circuit
R1
R2
VIN
EN
LX
FB
L1 2.2mH
CIN
10mF
VIN=2.5V to 5.5V
GND COUT
10mF
VOUT=1.8V
ON OFF
AP3428/A
C1
22pF 300k
150k
Pin Descriptions
Pin
Name
Function
TSOT25/ TSOT25
(Type SM)
for AP3428
TSOT25/ TSOT25
(Type SM)
for AP3428A
U-DFN2020-6
(Type J)
1
3
2
EN
Enable control input. Force this pin voltage above 1.5V enables
the chip, and below 0.4V shuts down the device.
2
2
5
GND
Ground pin
3
5
4
LX
The drains of the internal main and synchronous power
MOSFET.
4
1
3
VIN
Bias supply. Chip main power supply pin
5
4
6
FB
Feedback voltage to internal error amplifier, the threshold
voltage is 0.6V.
1
NC
NC
AP3428/A T Illlfil I'll.
AP3428/A
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AP3428/A
Functional Block Diagram
LX
GND
Error
Amplifier
FB
EN
PWM
Comparator
Buffer &
Dead Time
Control
Logic
Control
Logic
Current
Sensing
Reverse Inductor
Current Comparator
VIN OVP Comparator
Oscillator
Slope
Compensation OCP
Comparator
Soft
Start
Bias
Generator
Shutdown
Comparator
Bandgap
Reference
UVLO
VIN
1(3){2}
5(4){6}
2(2){5}
3(5){4}
4(1){3}
(A): TSOT25/TSOT25 (Type SM) for AP3428
(B): TSOT25/TSOT25 (Type SM) for AP3428A
(C): U-DFN2020-6 (Type J)
m5” AP3428/A
AP3428/A
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AP3428/A
Absolute Maximum Ratings (Note 4)
Symbol
Parameter
Rating
Unit
VIN
Input Voltage
-0.3 to 6
V
VEN
EN Pin Voltage
-0.3 to VIN+0.3
V
VLX
LX Pin Voltage
-0.3 to VIN+0.3
V
-3V to 7V (<40ns)
V
VFB
Feedback Pin Voltage
-0.3 to VIN+0.3
V
PD
Power Dissipation (on PCB, TA = +25°C)
TSOT25
TSOT25 (Type SM)
0.4
W
U-DFN2020-6 (Type J)
1.89
θJA
Thermal Resistance (Junction to Ambient)
TSOT25
TSOT25 (Type SM)
220
°C/W
U-DFN2020-6 (Type J)
53
θJC
Thermal Resistance (Junction to Case, Simulation)
TSOT25
TSOT25 (Type SM)
130
ºC/W
U-DFN2020-6 (Type J)
25
TJ
Operating Junction Temperature
+155
°C
TSTG
Storage Temperature
-55 to +150
°C
VMM
ESD (Machine Model)
200
V
VHBM
ESD (Human Body Model)
2000
V
VCDM
ESD (Charge Device Mode)
1000
V
Note 4: Stresses greater than those listed under Absolute Maximum Ratings can 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 under Recommended Operating Conditions is not implied.
Exposure to Absolute Maximum Ratings for extended periods can affect device reliability.
Recommended Operating Conditions
Symbol
Parameter
Min
Max
Unit
VIN
Supply Voltage
2.5
5.5
V
TJ
Junction Temperature Range
-40
+125
°C
TA
Operating Ambient Temperature
-40
+85
°C
m5” AP3428/A
AP3428/A
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AP3428/A
Electrical Characteristics (@TA = +25ºC , VIN = 5.0V, VOUT = 2.5V, COUT = 10µF, L = 2.2µH, unless otherwise specified.)
Symbol
Parameter
Condition
Min
Typ
Max
Unit
VIN
Input Voltage Range
2.5
5.5
V
VOUT
Output Voltage Range
0.6
VIN
V
IQ
Quiescent Current
VFB = 0.65V
40
µA
ISD
Shutdown Current
VEN = 0V
0.1
1
µA
VFB
Regulated Feedback Voltage
0.588
0.6
0.612
V
IFB
FB Leakage Current
VFB = 1V
0.2
µA
ILIM
Peak Inductor Current
1.3
A
fOSC
Oscillator Frequency
1.5
MHz
RDS(ON)
Drain-Source On-State
Resistance
ISW = 100mA High Side
250
mΩ
ISW = 100mA Low Side
170
mΩ
RDISCH
Output Discharge Switch On
Resister
2.1
k
VENH
EN Threshold High
1.5
V
VENL
EN Threshold Low
0.4
V
IEN
EN Leakage Current
VIN = VEN = 5V
-1.0
1.0
µA
VUVLO
Input UVLO Threshold
2.4
2.7
V
VHYS
UVLO Hysteresis
0.1
V
TOTP
Over Temperature Protection
+160
°C
TOTH
OTP Hysteresis
+15
°C
tSS
Soft-Start Time
2
ms
m5” AP3428/A
AP3428/A
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AP3428/A
Performance Characteristics (@TA = +25°C, VIN = 5V, VOUT = 1.8V, unless otherwise specified.)
Efficiency vs. Load Current Feedback Reference Voltage vs. Temperature
PFET Drain-Source On-State Resistance vs. Temperature NFET Drain-Source On-State Resistance vs. Temperature
Quiescent Current vs. Temperature Oscillation Frequency vs. Temperature
10 100 1000
0
10
20
30
40
50
60
70
80
90
100
Efficiency (%)
Output Current (mA)
VIN=5V, VOUT=1.0V
VIN=5V, VOUT=1.8V
VIN=5V, VOUT=3.3V
-60 -40 -20 0 20 40 60 80 100 120 140
0.570
0.575
0.580
0.585
0.590
0.595
0.600
0.605
0.610
0.615
0.620
0.625
0.630
Feedback Reference Voltage (V)
Temperature (oC)
-60 -40 -20 0 20 40 60 80 100 120 140
100
120
140
160
180
200
220
240
260
PFET RDS(ON) (m)
Temperature (oC)
-60 -40 -20 0 20 40 60 80 100 120 140
80
100
120
140
160
180
200
220
240
NFET RDS(ON) (m)
Temperatrue (oC)
-60 -40 -20 0 20 40 60 80 100 120 140
0
10
20
30
40
50
60
70
80
90
100
Quiescent Current (mA)
Temperatrue (oC)
-60 -40 -20 0 20 40 60 80 100 120 140
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
Oscillation Frequency (MHz)
Temperature (oC)
AP3428/ A mm M «w nnnrm mm “mm m M’ i Maw Tm ‘wrm mm“ mm
AP3428/A
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AP3428/A
Performance Characteristics (@TA = +25°C, VIN = 5V, VOUT = 1.8V, unless otherwise specified.) (continued)
Enable Turn On Characteristic (IOUT = 1A) Enable Turn Off Characteristic (IOUT = 1A)
Short Current Protection (IOUT = 1A) SCP Recovery (IOUT = 1A)
Load Transient (IOUT=0.1A to 1A) Load Transient (IOUT=0.5A to 1A)
VEN
(5V/div)
VOUT
(1V/div)
IL
(1A/div)
VSW
(5V/div)
VEN
(5V/div)
VOUT
(1V/div)
IL
(1A/div)
VSW
(5V/div)
VOUT
(1V/div)
IL
(1A/div)
VSW
(5V/div)
VOUT
(1V/div)
IL
(1A/div)
VSW
(5V/div)
VOUT_AC
(100mV/div)
IO
(1A/div)
VOUT_AC
(100mV/div)
IO
(1A/div)
Time (2ms/div)
Time (2ms/div)
Time (2ms/div)
Time (2ms/div)
Time (2ms/div)
Time (2ms/div)
m5” AP3428/A 1:17:12 (Van: 1 ' M )
AP3428/A
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AP3428/A
Application Information
Typical application circuit is shown in the Typical Applications Circuit and for the circuit parameters setting please refers to the following
descriptions.
Under Voltage Lockout (UVLO) Circuit
When the VIN drops lower than the UVLO detector threshold, the UVLO circuit starts to operate, VREF stops, and high-side switch and low-side
switch built-in switch transistors turn “OFF”. As a result, VOUT drops according to the COUT capacitance value and the load. When the VIN is rising
higher than UVLO released voltage, the IC will restart the operation.
Short Circuit Protection and Recovery
When the AP3428/A output node is shorted to GND that VFB drops under 0.42V, AP3428/A will enter hiccup mode to protect itself. If short circuit is
removed, and VFB rises over 0.42V, the AP3428/A recovers to normal operation again. If the AP3428/A reaches OCP threshold while short circuit,
the AP3428/A will enter cycle by cycle current limit mode until the current under OCP threshold.
Over Temperature Protection
The internal thermal temperature protection circuitry is provided to protect the integrated circuit in the event that the maximum junction
temperature is exceeded. When the junction temperature exceeds +160°C , it shuts down the internal control circuit and switching power MOSFET.
The AP3428/A will restart automatically under the control of soft start circuit when the junction temperature decreases to +145°C .
Setting the Output Voltage
The output voltage can be adjusted from 1 to 5V using an external resistor divider. Table 1 shows a list of resistor selections for common output
voltages. Resistor R1 is selected based on a design tradeoff between efficiency and output voltage accuracy. For high values of R1 there is less
current consumption in the feedback network. However the tradeoff is output voltage accuracy due to the bias current in the error amplifier. R1 can
be determined by the following equation. Meanwhile, the input capacitor should close to IC for preventing unexpected influences.
Figure 1. Feedback Divider Network Table 1. Resistor Selection for Common Output
Out Voltage
R1
R2
C1
1.0V
91k
120k
22pF
1.2V
100k
100k
22pF
1.5V
150k
100k
22pF
1.8V
300k
150k
22pF
2.5V
380k
120k
22pF
2.8V
440k
120k
22pF
3.3V
430k
100k
22pF
LX
FB
R1
R2
C1
m5” AP3428/A AP34282(_ X X X —_I_IT— j j ‘x x \-< ‘e="" \="">< e=""><‘§ e="" e="" e="">
AP3428/A
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AP3428/A
Ordering Information
KT : TSOT25
AP3428X X X - X
Packing
Package
TR : Tape & Reel
Product Name
G1 : RoHS Compliant
and Green
RoHS/Green
DN : U-DFN2020-6
Product Version
A : AP3428A
Blank : AP3428
(Type J)
WT : TSOT25(Type SM) 7 : Tape & Reel
Part Number
Status
Package
Identification Code
Temperature Range
Packing
AP3428AKTTR-G1
NRND
TSOT25
L2J
-40 to +85°C
3000/Tape & Reel
AP3428KTTR-G1
NRND
TSOT25
L2H
-40 to +85°C
3000/Tape & Reel
AP3428DNTR-G1
Active
U-DFN2020-6(Type J)
CQ
-40 to +85°C
3000/Tape & Reel
AP3428AWT-7
Active
TSOT25 (Type SM)
BD
-40 to +85°C
3000/Tape & Reel
AP3428WT-7
Active
TSOT25 (Type SM)
BC
-40 to +85°C
3000/Tape & Reel
Note 5: NRND = Not Recommended for New Design.
Marking Information
TSOT25 (Type SM) for AP3428WT-7 and AP3428AWT-7
1 2 3
5
7
4XX : Identification Code
W : Week : A to Z : 1 to 26 week;
X : Internal Code
(Top View)
Y : Year 0 to 9
a to z : 27 to 52 week; z represents
52 and 53 week
XX Y W X
Part Number
Package
Identification Code
AP3428WT-7
TSOT25 (Type SM)
BC
AP3428AWT-7
TSOT25 (Type SM)
BD
ms” AP3428/A A L2H (1\ L2] («\CQ
AP3428/A
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AP3428/A
Marking Information (continued)
(1) TSOT25 for AP3428
(Top View)
(2) TSOT25 for AP3428A
(Top View)
(3) U-DFN2020-6 (Type J)
(Top View)
First Line: Logo and Marking ID
First Line: Logo and Marking ID
First Line: Logo and Marking ID
m5” AP3428/A
AP3428/A
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AP3428/A
Package Outline Dimensions
Please see http://www.diodes.com/package-outlines.html for the latest version.
(1) Package Type: TSOT25 (Type SM)
P IN # 1
D
e1
e
E1 E
A2
A
A1
L
a
b
c
L1
L2
S e a tin g
P la n e
TSOT25 (Type SM)
Dim
Min
Max
Typ
A
0.70
0.90
--
A1
0.00
0.10
--
A2
0.70
0.80
0.75
b
0.35
0.50
--
c
0.08
0.20
--
D
2.82
3.02
2.92
E
2.65
2.95
2.80
E1
1.60
1.70
1.65
e
0.95 BSC
e1
1.90 BSC
L
0.30
0.60
0.40
L1
0.59 REF
L2
0.25 BSC
a
--
All Dimensions in mm
m5” AP3428/A \4
AP3428/A
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AP3428/A
Package Outline Dimensions (continued)
Please see http://www.diodes.com/package-outlines.html for the latest version.
(2) Package Type: TSOT25
D
E1
E 1/2
e1
E
E /2
e
A
A2
A1
S eating Plane
0
L2
L
Gauge Plane
01( 4x)
01( 4x)
c
b
S eating Plane
(3) Package Type: U-DFN2020-6 (Type J)
D
D2
E
eb
L
E2
AA1 A3
D2/2
E 2/2
R0.100
Seating Plane
TSOT25
Dim
Min
Max
Typ
A
-
1.00
-
A1
0.01
0.10
-
A2
0.84
0.90
-
b
0.30
0.45
-
c
0.12
0.20
-
D
-
-
2.90
E
-
-
2.80
E1
-
-
1.60
e
0.95 BSC
e1
1.90 BSC
L
0.30
0.50
-
L2
0.25 BSC
θ
θ1
12°
-
All Dimensions in mm
U-DFN2020-6
(Type J)
Dim
Min
Max
Typ
A
0.50
0.60
--
A1
0.00
0.05
0.03
A3
--
--
0.203
b
0.20
0.30
0.25
D
1.95
2.075
2.00
D2
1.45
1.65
1.55
E
1.95
2.075
2.00
E2
0.76
0.96
0.86
e
0.65 BSC
L
0.30
0.40
0.35
All Dimensions in mm
; ‘1 M L J UT + + $
AP3428/A
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AP3428/A
Suggested Pad Layout
Please see http://www.diodes.com/package-outlines.html for the latest version.
(1) Package Type: TSOT25 (Type SM)
C
Y1
Y
X
(2) Package Type: TSOT25
Y1
C
X
Y
(3) Package Type: U-DFN2020-6 (Type J)
X1
Y2 Y1
C
X
Y
G
Dimensions
Value (in mm)
C
0.950
X
0.700
Y
1.000
Y1
3.199
Dimensions
Value (in mm)
C
0.950
X
0.700
Y
1.000
Y1
3.199
Dimensions
Value
(in mm)
C
0.650
G
0.120
X
0.350
X1
1.650
Y
0.550
Y1
0.960
Y2
2.300
m5” AP3428/A had 203 @ 1h“as.//www.di0des.com/ab0uI/com Danv/termsrandrchdwlionsRermsrandrcondmonsoflsales/
AP3428/A
Document number: DS37417 Rev. 5 - 2
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AP3428/A
Mechanical Data
TSOT25/TSOT25 (Type SM)
Moisture Sensitivity: Level 3 per J-STD-020
Terminals: Finish - Mate Tin Plated Leads, Solderable per MIL-STD-202, Method 208
Weight: 0.014 grams (Approximate)
U-DFN2020-6 (Type J)
Moisture Sensitivity: Level 1 per J-STD-020
Terminals: Finish - NiPdAu over Copper Leads, Solderable per MIL-STD-202, Method 208
Weight: 0.007 grams (Approximate)
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WITH REGARDS TO ANY INFORMATION CONTAINED IN THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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2. The Information contained herein is for informational purpose only and is provided only to illustrate the operation of Diodes products
described herein and application examples. Diodes does not assume any liability arising out of the application or use of this document or any
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