RT9181CB

Manufacturer Part NumberRT9181CB
Description150mA LDO regulator with POG
ManufacturerRichtek Technology Corporation
RT9181CB datasheet
 

Specifications of RT9181CB

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General Description
The RT9181 is a low dropout voltage regulator with
an output 2% accuracy and supply a continuous
150mA current within operating range from a +3V to
+5.5V input. The power good function monitors the
output voltage and indicates by pulling low the power
good output (open drain).
The RT9181 requires a small output capacitor with
low ESR for stabilizing output voltage. The device
also minimizes output overshoot during power up.
The RT9181 uses an internal PMOS as the pass
device, which consumes 160µA supply current
independent of load and dropout conditions. The CE
pin controls the output and consumes no input bias
current. Other features include current limiting, over
temperature protection, and under voltage lockout.
Applications
Processor Power-Up Sequencing
Laptop, Notebook, and Palmtop Computers
Ordering Information
RT9181
Package type
B : SOT-25
Operating temperature range
C: Commercial standard
DS9181-00 February 2002
Preliminary
150mA LDO Regulator with POG
Features
Low Dropout Voltage Regulator, Output 1.2V
Up to 150mA Output Current
Power Good (POG) Function
Chip Enable/Shutdown Function
Load Independent, Low Ground Current, 160µ µ µ µ A
Current Limiting and Thermal Protection
Under Voltage Lockout (UVLO)
Low Variation Due to Load and Line Regulation
Output Stable with Low ESR Capacitors
SOT-25 Package
Pin Configurations
Part Number
RT9181CB
(Plastic SOT-25)
Typical Application Circuit
V
IN
C
IN
1µF
ON
OFF
RT9181
Pin Configurations
TOP VIEW
5
4
1. VIN
2. GND
3. CE
3
1
2
4. POG
5. VOUT
10K
VIN
POG
POG
V
CE
VOUT
OUT
C
GND
OUT
1µF
www.richtek-ic.com.tw
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RT9181CB Summary of contents