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Triple Low Dropout

Regulator Controllers

POWER MANAGEMENT

Description

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.

SC1112

.eatures

K

Triple linear controllers

K

Selectable and Adjustable Output Voltages

K

LDOs track input voltage within 200mV (.unction of

the Mosfets used) until regulation

K

Integrated Charge Pump

K

Programmable Power Good delay Signal

K

Latched Over Current Protection (VTT)

Applications

K

Pentium

廬

III Motherboards

K

Triple power supplies

Typical Application Circuit

+3.3V

VTT

+5V STBY

1K

R1

POWER GOOD

C6

330u

Q2

5VSTBY

ADJGATE

C1

10u

SC1112/A

GND

AGPGATE

AGPSEN

VTTGATE

VTTSEN

AGPSEL

VTTSEL

VTTIN

C3

0.1u

Q3

C14

330u

AGP

Q1

C2 C18

330u

C16

330u

C17

0.1u

VTT

C19

330u

C8

330u

C9

0.1u

ADJ

RA

ADJSEN

0.1u

C11

CAP-

CAP+

1u

C10

FC

DELAY

C13

0.1u

C12

330u

RB

22n C 5

PWRGD

VTT SELECT Signal

AGP SELECT Signal

Revision 7, October 2001

1

www.semtech.com

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