sc1102cstr Semtech Corporation, sc1102cstr Datasheet

sc1102cstr

Manufacturer Part Number

sc1102cstr

Description

Synchronous Voltage Mode Controller For Distributed Power Supply Applications

Manufacturer

Semtech Corporation

Datasheet

1.SC1102CSTR.pdf (12 pages)

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The SC1102 and SC1102A are low-cost, full featured,

synchronous voltage-mode controllers designed for use

in single ended power supply applications where efficiency

is of primary concern. Synchronous operation allows for

the elimination of heat sinks in many applications. The

SC1102s are ideal for implementing DC/DC converters

needed to power advanced microprocessors in low cost

systems, or in distributed power applications where effi-

ciency is important. Internal level-shift, high-side drive

circuitry, and preset shoot-thru control, allows the use of

inexpensive N-channel power switches.

SC1102s features include temperature compensated

voltage reference, triangle wave oscillator and current

sense comparator circuitry. Power good signaling, shut-

down, and over voltage protection are also provided.

The SC1102 operates at a fixed frequency of 200kHz

and the SC1102A at 500kHz, providing a choice for op-

timum compromise between efficiency, external compo-

nent size, and cost.

Two SC1102s can be used together to sequence power

up of telecom systems. The power good of the first

SC1102 connected to the enable of the second SC1102

makes this possible.

POWER MANAGEMENT

Revision: January 5, 2006

Description

Typical Application Circuit

T T T T T ypical Distribut

Figure 1.

ypical Distribut

ypical Distributed P

PWRGD

OVP

+5V

0.1

opt.

ed P

ed Po o o o o w w w w w er Supply

ed P

MBR0520

0.1

er Supply

VCC

PWRGD

OVP

OCSET

PHASE

DRVH

PGND

SC1102

SS/SHDN

SENSE

DRVL

VREF

BSTH

BSTL

GND

0.1

for Distributed Power Supply Applications

1.0

Synchronous Voltage Mode Controller

+12V

SHDN

VREF

3.9

2.2

Features

Applications

STP40NE

1.265V reference available

Synchronous operation for high efficiency (95%)

On-chip power good and OVP functions

Small size with minimum external components

Soft Start

Enable function

14 Pin SOIC lead free package available. Fully

WEEE and RoHS compliant

Microprocessor core supply

Low cost synchronous applications

Voltage Regulator Modules (VRM)

DDR termination supplies

Networking power supplies

Sequenced power supplies

DS(ON)

current sensing

NOTE:

*) Vout = 1.265 x (1+R8/R7)

2uH

10.0

127

180/4V

680/6.3V

SC1102/SC1102A

C10

180/4V

124*

680/6.3V

C11

180/4V

680/6.3V

C12

180/4V

Vin 5V

C13

180/4V

www.semtech.com

Vout=2.5V*

Related parts for sc1102cstr

sc1102cstr Summary of contents

Page 1

POWER MANAGEMENT Description The SC1102 and SC1102A are low-cost, full featured, synchronous voltage-mode controllers designed for use in single ended power supply applications where efficiency is of primary concern. Synchronous operation allows for the elimination of heat sinks in many ...

Page 2

POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Exposure to Absolute Maximum rated conditions ...

Page 3

POWER MANAGEMENT Electrical Characteristics (Cont.) Unless specified 4.75V to 12.6V; GND = PGND = 0V ...

Page 4

POWER MANAGEMENT Pin Configuration Top View (14-Pin SOIC) Pin Descriptions ...

Page 5

POWER MANAGEMENT Block Diagram Applications Information - Theory of Operation Synchronous Buck Converter Primary V power is provided by a synchronous, volt- CORE age-mode pulse width modulated (PWM) controller. This section has all the features required to build a high ...

Page 6

POWER MANAGEMENT Applications Information (Cont.) Soft Start Initially, SS/SHDN sources 10µA of current to charge an external capacitor. The outputs of the error amplifiers are clamped to a voltage proportional to the voltage on SS/SHDN. This limits the on-time of ...

Page 7

POWER MANAGEMENT Application Circuit Typical 12V Application Circuit with Bootstrapped BSTH + 1.74k C2 SC1102 opt. 0.1 1 VCC PWRGD 2 PWRGD OVP OVP 4 OCSET 5 PHASE D1 MBR0520 ...

Page 8

POWER MANAGEMENT Typical Characteristics Output Ripple Voltage Ch1: Vo_rpl 5V 3.3V 12A IN O OUT PIN Descriptions Ch1: Vo_rpl 5V 1.3V 12A IN OUT OUT 2006 ...

Page 9

POWER MANAGEMENT Typical Characteristics (Cont.) Ch1: Vo_rpl 5V 1.3V 12A IN OUT OUT Error Amplifier, Gain and Phase 40 PIN Descriptions Gain 10 Phase -10 ...

Page 10

POWER MANAGEMENT Typical Characteristics (Cont.) Hiccup Mode Start Up Mode 2006 Semtech Corp. SC1102/SC1102A Ch1: Vin Ch2: Vss Ch3: Top Gate Ch4: Vout Vin = 5V Vout = 3.3V Vbst = 12V Iout = S.C. Iout = S.C. Iout = ...

Page 11

POWER MANAGEMENT Evaluation Board Schematic 2006 Semtech Corp. SC1102/SC1102A 11 www.semtech.com ...

Page 12

... C A-B D GAGE PLANE 0.25 A SEE DETAIL SIDE VIEW -A- AND - DETERMINED AT DATUM PLANE -H- DIM INCHES Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 12 SC1102/SC1102A DIMENSIONS INCHES MILLIMETERS NOM MAX MIN NOM MAX - - .069 1.35 1. .010 0.10 0. ...

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