POWER MANAGEMENT

1

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SC2603

Simple PWM Boost Controller

Features

Applications

Revision: Nov 14, 2006

Typical Application Circuit

The SC2603 is a versatile, low-cost, voltage-mode PWM

controller designed for 16V input DC/DC power supply

applications. A simple, fixed-voltage boost regulator can

be implemented using the SC2603 with a minimum of

external components. The small device footprint

allows for compact circuit design.

SC2603 features include a temperature compensated

voltage reference, triangle wave oscillator, current limit

comparator, frequency shift over-current protection, and

an internally compensated error amplifier. Pulse by pulse

current limiting is implemented by sensing the

differential voltage across an external resistor, or an

appropriately sized PC board trace.

The SC2603 operates at a fixed frequency of 200kHz,

providing an optimum compromise between efficiency,

external component size, and cost.

Low cost / small size

Switch mode efficiency up to 95%

1% reference voltage accuracy

Over-current protection

800mA output drive

5V to 16V input power source

No need for external compensation network

SOT23-6 is fully WEEE and RoHS compliant

Portable Devices

Flat Panel TV

TV Set Top Box

Auxiliary Supplies

Peripheral Card Supplies

Industrial Power Supplies

High Density DC/DC Conversion

Description

R2

R3

L1

Q1

D1

C2

C1

R4

VIN

VOUT

GND

D2

optional

U2

SC2603

VIN

5

EN/SS

3

FB

1

GND

2

CS

6

Gate

4

R1

C4

Enable

C3

R5

C5

(open collector)

Open Drain with < 100

pull down impedance