ACE703

White LED PFM Step-Up DC-DC Converter

VER 1.2

1 

Description

The ACE703 is a PFM step-up DC-DC converter specifically designed to drive white LEDs with a

constant current. It can deliver stable constant output current from 0mA to 500mA by adjusting the

external resistor.

The ACE703 can drive one or more LEDs in parallel connection, also it can drive two in series, several

in parallel connection from one or two battery cells. With overvoltage limit protection circuit interiorly, the

chip and the external circuits will be safe even if the load is not connected. The device also can deliver

steady constant output voltage from 2.5V to 6.0V by adjusting the external resistor.

The ACE703 integrates stable reference circuits and it uses trimming technology in the process, so it can

afford high precision and low temperature-drift coefficient output current or output voltage.

The ACE703 devices are available in SOT-89-5 package.

Features

0 to 500mA by adjusting the external resistor.

and a resistor.

Application

Absolute Maximum Ratings

Parameter

Symbol

Max

Unit

Input supply voltage

-0.3~10

V

LX pin voltage

-0.3 ~ Vout+0.3 V

CE pin voltage

-0.3 ~ Vout+0.3 V

IFB pin voltage

-0.3 ~ Vout+0.3 V

Lx pin output current

1.5

A

SOT-89-5

0.5

W

Junction temperature

150

Storage temperature

- 40 to 125

Operating free-air temperature

-20 ~ 85