MIC5253 Datasheet by Microchip Technology

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IIIlllilEl.®
MIC5253 Micrel
MIC5253
100mA Low Noise µCap Teeny™ LDO
General Description
The MIC5253 is an efficient, CMOS voltage regulator opti-
mized for ultra-low-noise applications. It offers 1.5% initial
accuracy, extremely low dropout voltage (165mV at 100mA),
and low ground current (typically 95µA at full load). The
MIC5253 provides a very low noise output, ideal for RF
applications where a clean voltage source is required. A
noise bypass pin is also available for further reduction of
output noise.
Designed specifically for handheld and battery-powered de-
vices, the MIC5253 provides a TTL-logic-compatible enable
pin. When disabled, power consumption drops nearly to zero.
The MIC5253 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in handheld wireless devices.
Available in the Teeny™ SC-70-5 package, the MIC5253
offers a wide range of output voltages. Key features include
current limit, thermal shutdown, faster transient response,
and an active clamp to speed up device turn-off.
Typical Application
C
OUT
= 1.0µF
C
IN
= 1.0µF
Ceramic
Ceramic
15
2
34
C
BYP
= 0.01µF
Enable
Shutdown
EN
V
OUT
MIC5253-x.xBC5
EN (pin 3) may be
connected directly
to IN (pin 1).
V
IN
Ultra-Low-Noise Regulator Application
Features
Input voltage range: 2.7V to 5.5V
Teeny SC-70-5 package
Ultra-low output noise: 30µV(rms)
100mA continuous output current, 150mA peak current
Stability with ceramic output capacitors
Ultralow dropout: 165mV @ 100mA
High output accuracy:
1.5% initial accuracy
3.0% over temperature
Low ground current: 95µA
TTL-Logic-controlled enable input
•“Zero off-mode current
Thermal shutdown and current limit protection
Applications
Cellular phones and pagers
Cellular accessories
Battery-powered equipment
Laptop, notebook, and palmtop computers
Consumer/personal electronics
Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 http://www.micrel.com
M9999-112305
November 2005 1
MIC5253 Micrel
M9999-112305 2
Pin Configuration
2
GND
SC-70-5 (C5)
Pin Description
Pin Number Pin Name Pin Function
1 IN Supply Input.
2 GND Ground.
3 EN Enable/Shutdown (Input): CMOS compatible input. Logic high = enable; logic low = shutdown.
Do not leave open.
4 BYP Reference Bypass: Connect external 0.01µF CBYP 1.0µF capacitor to GND to reduce output
noise. May be left open.
5 OUT Regulator Output.
Ordering Information
November 2005
Standard Marking Pb-Free Marking**
MIC5253-1.5BC5 715 MIC5253-1.5YC5 715 1.5V –40°C to +125°C SC-70-5
MIC5253-1.8BC5 718 MIC5253-1.8YC5 718 1.8V –40°C to +125°C SC-70-5
MIC5253-1.85BC5 71J MIC5253-1.85YC5 71J 1.85V –40°C to +125°C SC-70-5
MIC5253-2.5BC5 725 MIC5253-2.5YC5 725 2.5V –40°C to +125°C SC-70-5
MIC5253-2.6BC5 726 MIC5253-2.6YC5 726 2.6V –40°C to +125°C SC-70-5
MIC5253-2.7BC5 727 MIC5253-2.7YC5 727 2.7V –40°C to +125°C SC-70-5
MIC5253-2.8BC5 728 MIC5253-2.8YC5 728 2.8V –40°C to +125°C SC-70-5
MIC5253-2.9BC5 729 MIC5253-2.9YC5 729 2.9V –40°C to +125°C SC-70-5
MIC5253-3.0BC5 730 MIC5253-3.0YC5 730 3.0V –40°C to +125°C SC-70-5
MIC5253-3.1BC5 731 MIC5253-3.1YC5 731 3.1V –40°C to +125°C SC-70-5
MIC5253-3.2BC5 732 MIC5253-3.2YC5 732 3.2V –40°C to +125°C SC-70-5
MIC5253-3.3BC5 733 MIC5253-3.3YC5 733 3.3V –40°C to +125°C SC-70-5
* Other voltage options available. Contact Micrel Marketing for details.
** Under bar symbol ( _ ) may not be to scale.
Part Number Voltage* Junction
Temp. Range Package
IN
OUTBYP
EN
7xx
13
4 5
2
MIC5253 Micrel
Electrical Characteristics(5)
VIN = VOUT + 1V, VEN = VIN; IOUT = 100µA; TJ = 25°C, bold values indicate 40°C TJ +125°C; unless otherwise noted.
Symbol Parameter Conditions Min Typical Max Units
VOOutput Voltage Accuracy IOUT = 100µA1.5 1.5 %
33%
VLNR Line Regulation VIN = VOUT + 1V to 6V 0.035 0.05 %/V
VLDR Load Regulation IOUT = 0.1mA to 100mA, Note 6 1.5 2.5 %
VIN VOUT Dropout Voltage(7) IOUT = 50mA 80 150 mV
IOUT = 100mA 165 300 mV
IQQuiescent Current VEN 0.4V (shutdown) 0.2 1µA
IGND Ground Pin Current(8) IOUT = 0mA 75 100 µA
IOUT = 100mA 90 150 µA
PSRR Ripple Rejection f = 100Hz, COUT = 1.0µF, CBYP = 0.1µF66dB
f = 1kHz, VIN = VOUT +1, CBYP = 0.1µF70dB
f = 10kHz, VIN = VOUT +1, CBYP = 0.1µF65dB
tON Turn-On Time 30 150 µs
ILIM Current Limit VOUT = 0V 150 250 450 mA
enOutput Voltage Noise COUT = 1.0µF, CBYP = 0.01µF, 30
µV(rms)
f = 10Hz to 100kHz
Enable Input
VIL Enable Input Logic-Low Voltage VIN = 2.7V to 5.5V, regulator shutdown 0.4 V
VIH Enable Input Logic-High Voltage VIN = 2.7V to 5.5V, regulator enabled 1.6 V
IEN Enable Input Current VIL 0.4V, regulator shutdown 0.01 µA
VIH 1.6V, regulator enabled 0.01 µA
Thermal Protection
Thermal Shutdown Temperature 150 °C
Thermal Shutdown Hysteresis 10 °C
Notes:
1. Exceeding the absolute maximum ratings may damage the device.
2. The device is not guaranteed to function outside its operating ratings.
3. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = (TJ(max)TA)/θJA. Exceeding the maximum allowable power
dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The θJA of the MIC5253-x.xBC5 (all versions) is
400°C/W on a PC board (see Thermal Considerations section for further details).
4. Devices are ESD sensitive. Handling precautions recommended.
5. Specification for packaged product only.
6. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range from
0.1mA to 100mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
7. Dropout Voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V differential.
For outputs below 2.7V, dropout voltage is the input-to-output voltage differential with the minimum input voltage 2.7V. Minimum input operating voltage
is 2.7V.
8. Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin current.
Absolute Maximum Ratings(1)
Supply Input Voltage (VIN) .................................. 0V to +7V
Enable Input Voltage (VEN) ................................. 0V to +7V
Power Dissipation (PD) ........................ Internally Limited(3)
Junction Temperature (TJ) ....................... 40°C to +125°C
Storage Temperature ............................... 65°C to +150°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
ESD Rating(4) ................................................................................ 2kV
Operating Ratings(2)
Input Voltage (VIN) ...................................... +2.7V to +5.5V
Enable Input Voltage (VEN) .................................. 0V to VIN
Junction Temperature (TJ) .......................40°C to +125°C
Thermal Resistance
SC-70-5JA) ....................................................400°C/W
M9999-112305
November 2005 3
MIC5253 Micrel
Typical Characteristics
0
10
20
30
40
50
60
70
80
PSRR (dB)
FREQUENCY (Hz)
100µA
1mA
10mA
100mA
Power Supply Rejection Ratio
V
OUT
= 1.8V
V
IN
= 2.8V
100 1k 10k 100k 1M
C
OUT
= 1µF
C
BYP
= 0.1µF
0
10
20
30
40
50
60
70
80
PSRR (dB)
FREQUENCY (Hz)
100µA
1mA
10mA
100mA
Power Supply Rejection Ratio
V
OUT
= 1.8V
V
IN
= 2.8V
C
OUT
= 1µF
C
BYP
= 0.01µF
100 1k 10k 100k 1M
81
82
83
84
85
86
87
88
0 25 50 75 100 125 150
GROUND CURRENT (µA)
OUTPUT CURRENT (mA)
Ground Pin Current
V
IN
= V
OUT
+ 1V
V
OUT
=1.8V
70
72
74
76
78
80
82
84
-40 -20 0 20 40 60 80 100 120
GROUND CURRENT (µA)
TEMPERATURE (°C)
Ground Pin Current
I
LOAD
= 100µA
0
10
20
30
40
50
60
70
80
012345
GROUND CURRENT (µA)
INPUT VOLTAGE (V)
Ground Pin Current
I
LOAD
= 100µA
0
10
20
30
40
50
60
70
80
90
012345
GROUND CURRENT (µA)
INPUT VOLTAGE (V)
Ground Pin Current
I
LOAD
= 100mA
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
OUTPUT VOLTAGE (mV)
INPUT VOLTAGE (V)
Dropout Characteristics
I
LOAD
= 100µA
I
LOAD
= 100mA
V
OUT
= 1.85V
0
50
100
150
200
250
-40 -20 0 20 40 60 80 100 120
DROPOUT VOLTAGE (mV)
TEMPERATURE (°C)
Dropout Voltage
V
IN
= 3.6V
V
OUT
= 2.6V
I
LOAD
= 100mA
0
50
100
150
200
250
300
350
0 25 50 75 100 125 150
DROPOUT VOLTAGE (mV)
OUTPUT CURRENT (mA)
Dropout Voltage
125°C
25°C
40°C
V
IN
= 3.6V
V
OUT
= 2.6V
150
170
190
210
230
250
270
290
2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9
SHORT CIRCUIT CURRENT (mA)
INPUT VOLTAGE (V)
Short Circuit Current
2.5
2.55
2.6
2.65
2.7
-40 -20 0 20 40 60 80 100 120
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
Output Voltage
vs. Temperature
I
LOAD
= 100µA
V
OUT
= 2.6V
V
IN
= 3.6V
70
72
74
76
78
80
82
84
86
88
90
-40 -20 0 20 40 60 80 100 120
GROUND CURRENT (µA)
TEMPERATURE (°C)
Ground Pin Current
ILOAD = 100mA
M9999-112305 2November 2005
M9999-112305 4November 2005
MIC5253 Micrel
C
IN
= 1µF Ceramic
C
OUT
= 1µF Ceramic
C
BYP
= 0.01µF
I
OUT
= 100µA
Line Transient Response
TIME (500µs/div)
Output Voltage
(50mV/div) Input Voltage
(1V/div)
4V
5V
CIN = 1µF Ceramic
COUT = 1µF Ceramic
CBYP = 0.01µF
VIN = 4V
100µA
100mA
Load Transient Response
TIME (5µs/div)
Output Current
(50mA/div) Output Voltage
(20mV/div)
C
IN
= 1µF Ceramic
C
OUT
= 1µF Ceramic
C
BYP
= 0.01µF
V
IN
= 4V
Shutdown Delay
TIME (500µs/div)
Output Voltage
(500mV/div) Enable Voltage
(1V/div)
CIN = 1µF Ceramic
COUT = 1µF Ceramic
CBYP = 0.01µF
IOUT = 100µA
Enable Pin Delay
TIME (5µs/div)
Output Voltage
(500mV/div) Enable Voltage
(1V/div)
Functional Characteristics
M9999-112305
November 2005 5
MIC5253 Micrel
Block Diagram
Reference
Voltage
Startup/
Shutdown
Control
EN
Quickstart/
Noise
Cancellation
Under-
voltage
Lockout
Thermal
Sensor
IN
FAULT
Error
Amplifier Current
Amplifier
GND
BYP
OUT
ACTIVE SHUTDOWN
M9999-112305 6 November 2005
MIC5253 Micrel
Applications Information
Enable/Shutdown
The MIC5253 comes with an active-high enable pin that
allows the regulator to be disabled. Forcing the enable pin low
disables the regulator and sends it into a zero off-mode-
current state. In this state, current consumed by the regulator
goes nearly to zero. Forcing the enable pin high enables the
output voltage. This part is CMOS and the enable pin cannot
be left floating; a floating enable pin may cause an indetermi-
nate state on the output.
Input Capacitor
The MIC5253 is a high performance, high bandwidth device.
Therefore, it requires a well-bypassed input supply for opti-
mal performance. A 1µF capacitor is required from the input
to ground to provide stability. Low-ESR ceramic capacitors
provide optimal performance at a minimum of space. Addi-
tional high-frequency capacitors, such as small valued NPO
dielectric type capacitors, help filter out high frequency noise
and are good practice in any RF based circuit.
Output Capacitor
The MIC5253 requires an output capacitor for stability. The
design requires 1µF or greater on the output to maintain
stability. The design is optimized for use with low-ESR
ceramic chip capacitors. High ESR capacitors may cause
high frequency oscillation. The maximum recommended
ESR is 300m. The output capacitor can be increased, but
performance has been optimized for a 1µF ceramic output
capacitor and does not improve significantly with larger
capacitance.
X7R/X5R dielectric-type ceramic capacitors are recom-
mended because of their temperature performance. X7R-
type capacitors change capacitance by 15% over their oper-
ating temperature range and are the most stable type of
ceramic capacitors. Z5U and Y5V dielectric capacitors change
value by as much as 50% and 60%, respectively, over their
operating temperature ranges. To use a ceramic chip capaci-
tor with Y5V dielectric, the value must be much higher than an
X7R ceramic capacitor to ensure the same minimum capaci-
tance over the equivalent operating temperature range.
Bypass Capacitor
A capacitor can be placed from the noise bypass pin to
ground to reduce output voltage noise. The capacitor by-
passes the internal reference. A 0.01µF capacitor is recom-
mended for applications that require low-noise outputs. The
bypass capacitor can be increased, further reducing noise
and improving PSRR. Turn-on time increases slightly with
respect to bypass capacitance. A unique quick-start circuit
allows the MIC5253 to drive a large capacitor on the bypass
pin without significantly slowing turn-on time. Refer to the
Typical Characteristics section for performance with differ-
ent bypass capacitors.
Active Shutdown
The MIC5253 also features an active shutdown clamp, which
is an N-channel MOSFET that turns on when the device is
disabled. This allows the output capacitor and load to dis-
charge, de-energizing the load.
No-Load Stability
The MIC5253 will remain stable and in regulation with no load
unlike many other voltage regulators. This is especially
important in CMOS RAM keep-alive applications.
Thermal Considerations
The MIC5253 is designed to provide 100mA of continuous
current in a very small package. Maximum ambient operating
temperature can be calculated based on the output current
and the voltage drop across the part. Given that the input
voltage is 5.0V, the output voltage is 2.9V, and the output
current = 100mA.
The actual power dissipation of the regulator circuit can be
determined using the equation:
PD = (VIN VOUT) IOUT + VIN IGND
Because this device is CMOS and the ground current is
typically <100µA over the load range, the power dissipation
contributed by the ground current is < 1% and can be ignored
for this calculation.
PD = (5.0V 2.9V) × 100mA
PD = 0.21W
To determine the maximum ambient operating temperature
of the package, use the junction-to-ambient thermal resis-
tance of the device and the following basic equation:
P (max) T (max) T
DJA
JA
=
θ
TJ(max) = 125°C, the max. junction temperture of the die
θJA thermal resistance = 400°C/W
Table 1 shows junction-to-ambient thermal resistance for the
MIC5253 in the SC-70 package.
Package θθ
θθ
θJA Recommended θθ
θθ
θJA 1" Sq. θθ
θθ
θJC
Minimum Footprint Copper Clad
SC-70-5 (C5) 400°C/W 325°C 250°C/W
Table 1. Thermal Resistance
Substituting PD for PD(max) and solving for the ambient
operating temperature will give the maximum operating con-
ditions for the regulator circuit. The junction-to-ambient ther-
mal resistance for the minimum footprint is 400°C/W, from
Table 1. The maximum power dissipation must not be ex-
ceeded for proper operation.
For example, when operating the MIC5253-2.9BC5 at an
input voltage of 5.0V and 100mA load with a minimum
footprint layout, the maximum ambient operating tempera-
ture TA can be determined as follows:
0.21W 125 C T
C/W
TC
A
A
=°−
°
400
41
M9999-112305
November 2005 7
MIC5253 Micrel
Therefore, a 2.9V application at 100mA of output current can
accept an ambient operating temperature of 41°C in a SC-70
package. For a full discussion of heat sinking and thermal
effects on voltage regulators, refer to the Regulator Thermals
section of
Micrels Designing with Low-Dropout Voltage Regu-
lators
handbook. This information can be found on Micrel's
website at:
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
M9999-112305 8 November 2005
MIC5253 Micrel
Package Information
0.30 (0.012)
0.10 (0.004)
2.20 (0.087)
1.80 (0.071)
2.40 (0.094)
1.80 (0.071)
1.35 (0.053)
1.15 (0.045)
0.65 (0.0256) BSC
1.00 (0.039)
0.80 (0.032)
0.10 (0.004)
0.00 (0.000)
DIMENSIONS:
MM (INCH)
0.30 (0.012)
0.15 (0.006)
0.18 (0.007)
0.10 (0.004)
1.10 (0.043)
0.80 (0.032)
5-Pin SC-70-5 (C5)
MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchasers
use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchasers own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2004 Micrel, Incorporated.
M9999-112305
November 2005 9

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