RT9181

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 µA
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




Application

Processor Power-Up Sequencing
Laptop, Notebook, and Palmtop Computers




Pinout






Specifications

Input Voltage, V_IN 7V
CE Input Voltage 7V
Power Good Output Voltage 7V
Power Dissipation, PD @ T_A = 25°CSOT-25 570mW
Junction Temperature Range-40°C ~ 125°C
Storage Temperature Range-65°C ~ 150°C
Operating Temperature Range 0°C ~ 70°C
Lead Temperature (Soldering, 10 sec)260°C




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 P-MOSFET as the pass device, which consumes 160mA supply current independent of load and dropout conditions. The EN pin controls the output and consumes no input bias current. Other features include current limiting, over temperature protection, and under voltage lockout.