UTC3563

LINEAR INTEGRATED CIRCUIT

1

QW-R103-013,B

HIGH-EFFICIENCY DC/DC

CONVERTER

DESCRIPTION

The UTC 3563 is a monolithic control circuit

containing the primary functions required for DC to DC

converters and highside-sensed constant current

source. The device consists of an internal temperature

compensated reference, comparator, controlled duty

cycle oscillator with an active current sense circuit,

bootstrapped driver, and high current output switch.

This device is specifically designed to construct a

constant current source for battery chargers with a

minimum

number

of

external

components.

Bootstrapped driver can drive the NPN output switch

to saturation for higher efficiency and less heat

dissipation. The UTC 3563 can deliver 1.5A

continuous current without requiring a heat sink.

FEATURES

*3V to 30V input voltage operation.

*Internal 2A peak current switch.

*1.5A continuous output current.

*Bootstrapped driver.

*High side current sense capability.

*High efficiency (up to 90%)

*Internal

±2% reference.

*Low quiescent current at 1.6mA.

*Frequency operation from 100Hz to 100KHz.

DIP-8

SOP-8

APPLICATIONS

*Constant current source for battery chargers.

*Saver for cellular phones.

*Step-Down DC-DC converter module.

PIN CONFIGURATION

DC

DE

CF

GND

BOOST

IS

VCC

FB

1

2

3

4

8

7

5

6