SC1211_03 SEMTECH [Semtech Corporation], SC1211_03 Datasheet

SC1211_03

Manufacturer Part Number

SC1211_03

Description

High Speed, Combi-SenseTM Synchronous MOSFET Driver

Manufacturer

SEMTECH [Semtech Corporation]

Datasheet

1.SC1211_03.pdf (11 pages)

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The SC1211 is a high speed, Combi-Sense

put driver designed to drive high-side and low-side

MOSFETs in a synchronous Buck converter. These

drivers combined with Combi-Sense PWM controllers,

such as Semtech SC2643VX or SC2643, provide a

cost effective multi-phase voltage regulator for advanced

microprocessors.

The Combi-Sense

current for peak current mode control of voltage regula-

tor without using sensing resistor. It provides the follow-

ing advantages:

The detailed explanation of the technique can be found

in the Applications Information section.

A 30ns max propagation delay from input transition to

the gate of the power FET’s guarantees operation at high

switching frequencies. Internal overlap protection circuit

prevents shoot-through from Vin to PGND in the main

and synchronous MOSFETs. The adaptive overlap pro-

tection circuit ensures the bottom FET does not turn on

until the top FET source has reached 1V, to prevent cross-

conduction.

8.5V gate drive provides optimum enhancement of

MOSFETs at minimum driver and MOSFET switching loss.

High current drive capability allows fast switching, thus

reducing switching losses at high (up to 1.5MHz) frequen-

cies without causing thermal stress on the driver.

Under-voltage-lockout and over-temperature shutdown

features are included for proper and safe operation.

Timed latches and improved robustness are built into

the housekeeping functions such as the Under Voltage

Lockout and adaptive Shoot-through protection circuitry

to prevent false triggering and to assure safe operation.

The SC1211 is offered in a Power SOIC-8L package.

Description

POWER MANAGEMENT

October 12, 2003

- Lossless current sensing

- High level noise free signal

- Only two small signal components (third optional)

- No costly precision sensing resistor

- Fast response

- Suitable for wide range of duty cycle

is a technique to sense the inductor

, dual out-

Features

Applications

High efficiency

+12V supply voltage with internal LDO for optimum

gate drive

High peak drive current

Adaptive non-overlapping gate drives provide

shoot-through protection

Support

Fast rise and fall times (15ns typical with 3000pf

load)

Ultra-low (<30ns) propagation delay (BG going low)

Floating top gate drive

Crowbar function for over voltage protection

High frequency (to 1.5 MHz) operation allows use

of small inductors and low cost ceramic capacitors

Under-voltage-lockout

Low quiescent current

Intel Pentium

AMD Athlon

supplies

High current low voltage DC-DC converter

Combi-Sense

Synchronous MOSFET Driver

High Speed, Combi-Sense

and AMD-K8

processor power supplies

and VID-on-fly operations

processor power

www.semtech.com

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