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Voltage Mode PWM Controller With

Linear Power Regulator

POWER MANAGEMENT

Description

The SC2621A provides the control and protection fea-

tures necessary for a synchronous buck converter and a

linear regulator in high performance graphic card appli-

cations.

The SC2621A is designed to directly drive the top and

bottom MOSFETs of the buck converter. It uses an inter-

nal 8.2V supply as the gate drive voltage for minimum

driver power loss and MOSFET switching loss. It allows

the converter to operate with 4V to 25V power rail and

as low as 0.5V output. The SC2621A is capable to drive

a N-type MOSFET in a linear regulator with as low as 0.5V

output.

The SC2621A features soft-start, supply power under

voltage lockout, and hiccup mode over current protec-

tion. The SC2621A monitors the output current by using

the Rdson of the bottom MOSFET in the buck converter

that eliminates the need for a current sensing resistor.

The SC2621A is offered in SOIC-14 package.

SC2621A

Features

u

u

u

u

u

u

u

u

u

4V to 25V power rails

Internal LDO for optimum gate drive voltage

1.5A gate drive current

Adaptive non-overlapping gate drives provide

shoot-through protection for MOSFETs

Programmable output voltages

Internal soft start for both outputs

Power rail under voltage lockout

Hiccup mode short circuit protection

SOIC-14 package, fully RoHS and WEEE compliant

Applications

u

Graphics processor power supplies on PCI-Express

platform

u

Embedded, low cost, high efficiency converters

u

Point of load power supplies

Typical Application Circuit

12V IN

+

1.5V OUT

U2

1

B ST

OCS

COMP

FB

LDOG

LDFB

GND

S C2 621A

DH

PN

GND

DL

DRV

NC

V CC

14

13

12

11

10

9

8

+

1

2

3.3V IN

2

3

4

2.5V OUT

5

6

7

+

February 21, 2007

1

www.semtech.com

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