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SC1112EVB

更新时间： 2025-07-23 22:50:19

品牌	Logo	应用领域
商升特 - SEMTECH		稳压器控制器
页数	文件大小	规格书
21页	338K
描述
Triple Low Dropout Regulator Controllers

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数据手册

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SC1112EVB 数据手册

SC1112

Triple Low Dropout

Regulator Controllers

POWER MANAGEMENT

ꢀeatures

Description

u Triple linear controllers

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.

u Selectable and Adjustable Output Voltages

u LDOs track input voltage within 200mV (ꢀunction of

the Mosfets used) until regulation

u Integrated Charge Pump

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.

u Programmable Power Good delay Signal

u Latched Over Current Protection (VTT)

Applications

u Pentium^®III Motherboards

u Triple power supplies

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.

Typical Application Circuit

+3.3V

VTT

+5V STBY

10u

0.1u

SC1112/A

POWER GOOD

5VSTBY

GND

AGPGATE

AGPSEN

VTTGATE

VTTSEN

AGPSEL

VTTSEL

VTTIN

330u

C14

330u

ADJGATE

ADJSEN

CAP-

AGP

VTT

ADJ

0.1u

C11

C2 C18

330u

C16

330u

C17

0.1u

CAP+

C10

DELAY

PWRGD

22n

C19

330u

0.1u

C13

0.1u

C12

330u

VTT SELECT Signal

AGP SELECT Signal

www.semtech.com

Revision 7, October 2001

12 3 4 5 6 7...21

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