點晶科技股份有限公司

SILICON TOUCH TECHNOLOGY INC.

-1 -

Version

：A.001

PC112/PC113

General Description

PC112/PC113 is a compact, high-efficiency step-up DC-DC converter which drives

2-6 series white LEDs with constant current from 3V to 5V. Extremely low shutdown

power supply current ensures the high efficiency of battery system. The PC113 works

at 500KHz, allowing the application of tiny external components. Low feedback voltage

and hence minimal input current from the battery extends battery life.

Built-in N-channel power switches optimize the layout area of PCB. Since

PC112/PC113 drives series LEDs, it regulates the light intensity uniformly. With a single

external resistor or PWM signal, users can easily set the LED current and LED

brightness.

While output loading is open, likes the case of LEDs failure, the duty cycle of the

DC-DC converter will increase rapidly, causing high output voltage to damage the

circuit. To avoid this situation, a Zener diode should be connected to the DC-DC

converter’s output to clamp the output voltage in most applications. However, PC113

has built-in the over-voltage protection circuit to protect the output circuit and thus

eliminates the need of the external Zener diode.

PC112/PC113 is also characterized of the soft-start feature, which limits the inrush

current. It is available in Thin-SOT type package.

Features

1. Typical 85% efficiency

2. No external power switch

3. Low shutdown supply current

4. Low feedback voltage

5. Drives 6 white LEDs 20mA from working voltage 2.0V

6.

4

7. Over voltage protection circuit build in(PC113)

8. Soft-start circuit build in

9. Thin 6-pin SOT23-6 package

Application

1. White LED Display Backlighting

2. Cellular Telephones

3. Personal Digital Assistant

4. Digital Cameras

5. Portable Machine