SC111 Semtech Corporation, SC111 Datasheet

SC111

Manufacturer Part Number

SC111

Description

0.8AMP POSITIVE VOLTAGE REGULATOR

Manufacturer

Semtech Corporation

Datasheet

1.SC111.pdf (7 pages)

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Current page: 1 of 7
Download datasheet (97Kb)

PRELIMINARY - October 9, 2000

DESCRIPTION

The SC1110 is a low-cost, full featured, synchronous

voltage-mode controller designed to generate termina-

tion voltage in double data rate (DDR) memory sys-

tems and other applications where wide data bus need

to be actively terminated. Synchronous control of the

MOSFET half bridge allows power flowing bi-

directionally. The termination voltage can be tightly

regulated to track the chipset voltage, i.e. to be exactly

50% of that at all times.

The SC1110 is ideal for low cost implementation of ter-

mination voltage supplies. SC1110 features include

temperature compensated voltage reference, triangle

wave oscillator and current sense comparator circuitry,

and allows the use of inexpensive N-channel power

switches.

The SC1110 operates at a fixed 250kHz, providing an

optimum compromise between efficiency, transient

performance, external component size, and cost.

TYPICAL APPLICATION CIRCUIT

REFOUT

SS/ENBL

PWRGD

C25

0.01

0.1

1.24k

0.1

C10-14: Sanyo, 4SP560M

C8,9,15-24: TDK, CC3216AX5R0J106K

L1: Panasonic, ETQP6F0R8L or Falco, QPIP1205-809-3

Q1,Q2 options: Si9426DY, FDS6890A, IRF7401

D1: ON Semi (Motorola)

VCC

SS/ENBL

OCSET

PWRGD

GND

PHASE

SC1110

SINK AND SOURCE DC/DC CONTROLLER FOR

TERMINATION POWER SUPPLY APPLICATIONS

REFOUT

SENSE

COMP

REFIN

BSTH

BSTL

TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

4.7k

0.022

0.047

MBRM120

FEATURES

APPLICATIONS

ORDERING INFORMATION

SC1110CSTR

Note:

(1) Only available in tape and reel packaging. A reel

contains 2500 devices.

2.2

652 MITCHELL ROAD NEWBURY PARK CA 91320

DEVICE

Generates termination voltages for active termina-

tion schemes

1% set point accuracy

For ±7A output current, transient regulation is bet-

ter than ±80mV

Buffered V

mode

Soft start and logic input enabling

250kHz switching for best transient and efficiency

performance

Gate drive capable for 0.5A sourcing and sinking

For DDR memory systems

For active termination schemes in high speed logic

systems

REFIN

DSON

Si9426DY

pin available

sensing for over current protection in hiccup

(1)

1.0

REFOUT

PACKAGE

1.0

C8,9

2 x 10uF

SO-14

800 nH

for system usage

C12-14

3 x 560uF

C10,11

2 x 560uF

10 x 10uF

C15-24

Vin 2.5V

+5Vcc

TEMP. RANGE (T

Vout = 1.25V @ 7A

0 - 125°C

SC1110

)

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