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8-Pin N-FET Linear

Regulator Controller

POWER MANAGEMENT

Description

The SC4210A linear regulator controller includes all the

features required for an extremely low dropout linear

regulator that uses an external N-channel MOSFET as

the pass transistor. The device can operate from input

voltages as low as 1.75V and can provide high current

levels, thus providing an efficient linear solution for cus-

tom processor voltages, bus termination voltages, and

other logic level voltages down to 0.5V. The onboard

charge pump creates a gate drive voltage capable of driv-

ing an external N-MOSFET which is optimal for low drop-

out voltage and high efficiency. The wide versatility of

this IC allows the user to optimize the setting of both

current limit and output voltage for applications beyond

or between standard 3-terminal linear regulator ranges.

The 8-pin controller IC features a duty ratio current limit-

ing technique that provides peak transient loading capa-

bility while limiting the average power dissipation of the

pass transistor during fault conditions.

The SC4210A is available in an MSOP-8 surface mount

package.

SC4210A

Features

On-board charge pump to drive external N-MOSFET

Input voltage as low as 1.75V to 5.5V

Duty ratio mode over-current protection

Extremely low dropout voltage

Low external parts count

Output voltages as low as 0.5V

MSOP-8 package

Applications

Telecom and networking cards

Industrial applications

Wireless infrastructure

Set-top boxes

Post regulated power supplies

Typical Application Circuit

R1

0.015

Vin = 3.3V

C1

22碌F

1

C2

0.01

2

VDD

CS

8

CAP

CT

7

C3

0.01

3

GND

FB

6

C5

0.1

Q1

FDB7030BL

4

COMP

VOUT

5

Vout = 1.8V @ 6Ap-k

R3

39k

R4

1.30k

C6

0.01

C7opt.

10碌F

R2

24k

C4

150pF

U1

SC4210A

R5

499

Revision: October 26, 2004

1

www.semtech.com

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