LTP3637
P-1
DESCRIPTION
The LTP3637 series of CMOS low dropout regulators are designed specifically for portable batterypowered applications which require ultralow quiescent current. The ultralow consumption of
typical 0.8 μA ensures long battery life and dynamic transient boost feature improves device
transient response for wireless communication applications.
The device is available in SOT23-5L packages.
FEATURES
Operating Input Voltage Range: 2.0 V to 5.5 V
Optional Output Voltages: 1.2 V, 1.5 V, 1.8 V, 2.5 V, 2.8 V, 3.0 V, 3.3 V, 3.6 V
Ultra-Low Quiescent Current: 0.8 μA Typically
Low Dropout: 170 mV Typically at 150 mA and VOUT = 1.8 V
High Output Voltage Accuracy ±1.5%
Stable with Ceramic Capacitors 1 μF
Over-Current Protection
Thermal Shutdown Protection
With auto discharge function at off state
APPLICATIONS
Battery Powered Equipments
Portable Communication Equipments
Cameras, Image Sensors and Camcorders
Label Information
ORDER INFORMATION
Model
Package
Ordering Number Note1
Packing Option
LTP3637
SOT23-5L
LTP3637-xxYT5
Tape and Reel, 3000
Note1: xx stands for output voltages, e.g. if xx = 18, the output voltage is 1.8 V; if xx = 30, the output voltage is 3.0 V.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1620-2N.1 — Data Sheet
Ultra-Low IQ 300 mA CMOS LDO Regulators
LTP3637
P-2
PIN CONFIGURATION (Top View)
IN
1
GND
2
EN
3
5
OUT
4
NC
SOT23-5L
PIN DESCRIPTIONS
Pin
SOT23-5
Symbol
Description
1
IN
Power Supply Input Voltage
2
GND
3
EN
Chip Enable Pin, not suspended.
4
NC
No Connection.
5
OUT
Output Pin
Ground.
ABSOLUTE MAXIIMUM RATINGS
Parameter
Symbol
Value
Unit
Input Voltage
VIN
6.5
V
Output Voltage
VOUT
−0.3 to VIN + 0.3
V
Chip Enable Input
VEN
−0.3 to 6.0
V
TJ
150
°C
Storage Temperature
TSTG
−55 to 150
°C
Thermal Characteristics, Thermal
Resistance, Junction-to-Air
RθJA
Operating Junction Temperature
Human Body Model
ESD Capability
Current Maximum Rating
ESD
Latch up
SOT23-5L
250
°C /W
6000
V
2000
V
200
mA
NOTE: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.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1620-2N.1 — Data Sheet
Ultra-Low IQ 300 mA CMOS LDO Regulators
LTP3637
P-3
CAUTION
This integrated circuit can be damaged by ESD if you don’t pay attention to ESD protection. LINEARIN
recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper
handling and installation procedures can cause damage. ESD damage can range from subtle performance
degradation to complete device failure. Precision integrated circuits may be more susceptible to damage
because very small parametric changes could cause the device not to meet its published specifications.
LINEARIN reserves the right to make any change in circuit design, specification or other related things if
necessary without notice at any time. Please contact LINEARIN sales office to get the latest datasheet.
RECOMMENDED OPERATING CONDITIONS
Symbol
Item
Rating
Unit
VIN
Input Voltage
2.0 to 5.5
V
IOUT
Output Current
0 to 300
mA
TA
Operating Ambient Temperature
−40 to 85
℃
CIN
Effective Input Ceramic Capacitor Value
0.47 to 4.7
μF
COUT
Effective Output Ceramic Capacitor Value
0.47 to 4.7
μF
ELECTRICAL CHARACTERISTICS
VIN = 2.5 V, IOUT = 1 mA, CIN = 1 µF, COUT = 1 µF, TA = +25 °C, unless otherwise noted.
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
VIN
Operating Input
2.0
5.5
V
VOUT
Output Voltage
TA = +25 °C
−1.5
+1.5
−40 °C ≤ TA ≤ 85 °C
−2.5
+2.5
%
IQ
Quiescent Current
IOUT = 0 mA
1.1
μA
ISD
Shutdown Current
VEN = 0 V
LineReg
Line Regulation
2.5 V ≤ VIN ≤ 5.5 V, IOUT = 1 mA
0.1
LoadReg
Load Regulation
1 mA ≤ IOUT ≤ 150 mA, VIN = 2.5 V
20
mV
VDROP
Dropout Voltage
IOUT = 150 mA
170
mV
I_LMT
Current Limit
ISHORT
Short Circuit Current
VOUT = 0 V
PSRR
Power supply Rejection Ratio
IOUT = 100 mA
eN
Output Noise Voltage
VIN = 2.5 V, IOUT = 1 mA,
f = 10 Hz to 100 kHz, COUT = 1 μF
0.8
0.1
300
90
0.2
550
%/V
mA
mA
f = 1 kHz
−55
f = 10 kHz
−52
dB
100
μVrms
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1620-2N.1 — Data Sheet
Ultra-Low IQ 300 mA CMOS LDO Regulators
LTP3637
P-4
APPLICATION CIRCUITS
1
INPUT
1μF
Chip
Enable
2
3
IN
OUT
5
OUTPUT
1μF
GND
EN
4
Note: The EN pin is not suspended
Applications Information
General
The LTP3637 is a high performance 300mA Linear Regulator with Ultra Low I Q. This device delivers
low Noise and high Power Supply Rejection Ratio with excellent dynamic performance due to
employing the Dynamic Quiescent Current adjustment which assure ultra low I Q consumption at noload state. These parameters make the device very suitable for various battery powered applications.
Input Decoupling (C IN)
It is recommended to connect at least a 1μF Ceramic X5R or X7R capacitor between IN and GND pins
of the device. This capacitor will provide a low impedance path for any unwanted AC signals or Noise
superimposed onto constant Input Voltage. The good input capacitor will limit the influence of input
trace inductances and source resistance during sudden load current changes.
Higher capacitance and lower ESR Capacitors will improve the overall line transient response.
Output Decoupling (C OUT)
The LTP3637 does not require a minimum Equivalent Series Resistance (ESR) for the output capacitor.
The X5R and X7R types have the lowest capacitance variations over temperature thus they are
recommended. There is recommended connect the output capacitor as close as possible to the
output pin of the regulator.
Current Limit Protection
When output current at the OUT pin is higher than current limit threshold, the current limit protection
will be triggered and clamp the output current to approximately 550mA to prevent over-current and
to protect the regulator from damage due to overheating.
Thermal Shutdown
When the die temperature exceeds the Thermal Shutdown point (T SD =160°
C typically) the device goes
to disabled state and the output voltage is not delivered until the die temperature decreases to 150°
C.
The Thermal Shutdown feature provides a protection from a catastrophic device failure at accidental
overheating. This protection is not intended to be used as a substitute for proper heat sinking.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1620-2N.1 — Data Sheet
Ultra-Low IQ 300 mA CMOS LDO Regulators
LTP3637
P-5
Power Dissipation and Heat sinking
The maximum power dissipation supported by the device is dependent upon board design and layout.
Mounting pad configuration on the PCB, the board material and the ambient temperature affect the rate of
junction temperature rise for the part. The maximum power dissipation the LTP3637 device can handle is
given by:
PD(MAX) =
TJ(MAX) - TA
PθJA
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
(equation-1)
FN1620-2N.1 — Data Sheet
Ultra-Low IQ 300 mA CMOS LDO Regulators
LTP3637
P-6
PACKAGE OUTLINE
SOT23-5L
D
d
θ
E
L
E1
e
e1
A1
c
A
Unit:mm
Symbol
A
A1
b
c
D
E
E1
e
e1
L
θ
Dimensions In Millimeters
MIN
MAX
1.050
1.250
0.000
0.350
0.100
0.500
0.080
2.820
2.600
0.200
3.020
3.000
1.600
1.700
0.950BSC
1.800
2.000
0.300
0°
0.600
8°
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1620-2N.1 — Data Sheet
Ultra-Low IQ 300 mA CMOS LDO Regulators
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