sc1112a Semtech Corporation, sc1112a Datasheet

sc1112a

Manufacturer Part Number

sc1112a

Description

Triple Low Dropout Regulator Controllers

Manufacturer

Semtech Corporation

Datasheet

1.SC1112A.pdf (22 pages)

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Company:

Bonase Electronics (HK) Co., Limited

Part Number:

sc1112aS

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Quantity:

1 305

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The SC1112 was designed for the latest high speed

motherboards. It includes three low dropout regulator con-

trollers. The controllers provide the power for the system

AGTL bus Termination Voltage, Chipset, and clock circuitry.

An adjustable controller with a 1.2V reference is available,

while two selectable outputs are provided for the VTT

(1.25 V or 1.5V, SC1112) or (1.2V or 1.5V, SC1112A)

and the AGP (1.5V or 3.3V). The SC1112 low dropout

regulators are designed to track the 3.3V power supply

as the VTTIN supply is cycled On and Off. A latched short

circuit protection is also available for the VTT output.

Other features include an integrated charge pump that

provides adequate gate drives for the external Mosfets,

and a capacitive programable delay for the power good

signal.

POWER MANAGEMENT

Revision 7, October 2001

Description

Typical Application Circuit

ADJ

0.1u

C13

330u

C12

POWER GOOD

VTT

0.1u

22n

C10

C11

VTT SELECT Signal

5VSTBY

ADJGATE

ADJSEN

CAP-

CAP+

DELAY

PWRGD

SC1112/A

AGPGATE

VTTGATE

AGPSEN

AGPSEL

VTTSEN

VTTSEL

VTTIN

GND

Features

Applications

Triple linear controllers

Selectable and Adjustable Output Voltages

LDOs track input voltage within 200mV (Function of

the Mosfets used) until regulation

Integrated Charge Pump

Programmable Power Good delay Signal

Latched Over Current Protection (VTT)

Pentium

Triple power supplies

0.1u

AGP SELECT Signal

C19

330u

III Motherboards

330u

Regulator Controllers

Triple Low Dropout

0.1u

330u

C18

C16

330u

C14

330u

SC1112

www.semtech.com

10u

C17

0.1u

+3.3V

+5V STBY

AGP

VTT

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