RT9181 Datasheet, PDF (1/10 Pages) Richtek Technology Corporation – 150MA LDO REGULATOR WITH POG

Preliminary
RT9181
150mA LDO Regulator with POG
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
z Processor Power-Up Sequencing
z Laptop, Notebook, and Palmtop Computers
Ordering Information
RT9181… …
Package type
B : SOT-25
Operating temperature range
C: Commercial standard
Features
z Low Dropout Voltage Regulator, Output 1.2V
z Up to 150mA Output Current
z Power Good (POG) Function
z Chip Enable/Shutdown Function
z Load Independent, Low Ground Current, 160µA
z Current Limiting and Thermal Protection
z Under Voltage Lockout (UVLO)
z Low Variation Due to Load and Line Regulation
z Output Stable with Low ESR Capacitors
z SOT-25 Package
Pin Configurations
Part Number
Pin Configurations
RT9181CB
(Plastic SOT-25)
5
4
123
TOP VIEW
1. VIN
2. GND
3. CE
4. POG
5. VOUT
Typical Application Circuit
V_IN
VIN POG
C_IN
1µF
CE VOUT
ON
GND
OF F
10K
POG
V_OUT
C _{OU T}
1µF
DS9181-00 February 2002
www.richtek-ic.com.tw
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