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SS6563

Versatile DC/DC Converter

FEATURES

Operates from 3V to 30V input voltage

Internal 2A peak current switch.

Continuous output current of 1.5A

Bootstrapped driver.

High-side current sense capability.

High efficiency (up to 90%).

Internal

±2% reference.

Low quiescent current at 1.6mA.

Operating frequency from 100Hz to 100KHz.

APPLICATIONS

Constant Current Source for Battery Chargers.

Saver for Cellular phones.

Step-Down DC/DC Converter Module.

DESCRIPTION

The SS6563 is a monolithic control circuit that

provides the primary functions required for DC to

DC converters and high-side-sensed constant

current sources. The device consists of an inter-

nal temperature compensated reference, com-

parator, 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 cur-

rent source for battery chargers with a minimum

number of external components. A bootstrapped

driver can drive the NPN output switch to satura-

tion for higher efficiency and less heat dissipation.

The SS6563 can deliver 1.5A continuous current

without requiring a heat sink.

TYPICAL APPLICATION CIRCUIT

+

C3

1

µF

470

µF

+

C1

100

µF

C2

1000pF

R1

470

RB

3K

R3

2.2M

RS

0.22

RA

1K

R2

390K

D1

1N5819

D3

D2

1N4148

L1

300

µH

SS6563

8

7

6

5

4

3

2

1

BOOST

FB

GND

IS

DC

DE

CF

VCC

+

C4

5V/1A

8V~25V

make R1=1K

1N4148

Line Regulation

40mV

Load Regulation

20mV

Short Circuit Current

Ω

1.3A

Step-Down Converter

Rev.2.02 4/06/2004