POWER MANAGEMENT

SC4624

Low Input Voltage, High Efficiency, 4A Integrated

FET Synchronous Step down DC/DC Regulator

The SC4624 is a highly integrated synchronous step-down

DC/DC regulator designed for low input voltage range of

2.3V to 5.5 Volts. It can deliver 4A continuous output

current with the output voltage as low as 0.5 Volts. The

internal low R

the need for external Schottky diode while delivering

overall converter efficiency up to 95%.

A power good pin is available to monitor the output voltage

status. Operating frequency is adjustable from 200 kHz

to 2MHz with a single resistor and it can be synchronized

to an external clock.

The SC4624 offers adjustable current limit, soft start and

over temperature protection to safeguard the device under

extreme operating conditions. The soft start provides a

controlled output voltage ramp up at startup. When a

logic low is applied to the Enable pin, the SC4624 enters

the shutdown mode and it consumes less than 1.5µA of

current.

The SC4624 is available in 4x4 MLPQ-20 and SOIC-16EDP

package, and it is rated over -40°C to +105°C ambient

temperature range.

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VIN Range: 2.3 – 5.5V

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4A Continuous Output Current

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Adjustable Output Voltage 0.5V to Vin

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Low R

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Up to 95% Efficiency

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Synchronizable and Programmable Frequency:

200kHz – 2MHz

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Power Good Monitor

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<1.5µA of Shutdown Current

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Programmable Soft Start

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Programmable Current Limit

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Over Temperature protection

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-40 to +105°C Ambient Temperature Range

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Starts into pre-biased output

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4x4mm MLPQ-20 and SOIC-16EDP packages-

WEEE and RoHS Compliant

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Low Voltage Distributed DC-DC Converters

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Telecommunication Power Supplies

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Portable Equipment

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xDSL

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1

Revision: October 08, 2008

Description

Features

Features

Typical Application Circuit

Applications

Vout

Vin

R3

R3

C5

C5

C8

C8

R5

R5

R8

R8

R7

R7

R2

R2

C9

C9

C7

C7

C4

C4

R4

R4

C1

C1

R6

R6

C2

C2

R1

R1

R9

R9

SC4624

SC4624

COMP

FB

PGOOD

SYNC/EN

VCC

SS

FS

PH

ISET

PVIN

C11

C11

R11

R11

C3

C3

L1

L1