US1176

2-1

Rev. 1.1

9/24/99

7.5A ULTRA LOW DROPOUT POSITIVE

ADJUSTABLE REGULATOR WITH SHUTDOWN INPUT

The US1176 product is a 7.5A regulator with extremely

low dropout voltage using a proprietary Bipolar pro-

cess that achieves comparable equivalent on re-

sistance to that of discrete MOSFETs. The US1176

also provides a convenient Shutdown pin that allows the

regulator to be shutdown and reduce the input current

consumption. Unlike the PNP type regulators this de-

vice does not have high quiecent current during the start

up mode making it ideal for applications where there is

limited current capability such operation from the 5V

Standby supply of the computer power supply.One ap-

plication is the new generation of the RDRAM memory

that needs to provide 2.5V from 3.3V input and be able

to operate from 5VSB as well.

DESCRIPTION

DESCRIPTION

Guaranteed <TBDV Dropout at 7.5A

Fast Transient Response

1% Voltage Reference Initial Accuracy

Built-in Thermal Shutdown

PRELIMINARY DATASHEET

APPLICATIONS

APPLICATIONS

FEATURES

FEATURES

3.3V to 2.7V Intel I740 chip set.

TYPICAL APPLICATION

TYPICAL APPLICATION

Tj (

7 PIN PLASTIC

7 PIN PLASTIC

TO263 (M)

POWER FLEX (P)

0 TO 125

US1176CM

US1176CP

Typical application of US1176 .

PACKAGE ORDER INFORMATION

PACKAGE ORDER INFORMATION

3.3V

US1176

2.7V

C1

C3

1176app1-1.1

5V

C2

R1

R2

Vsense

SD

Adj

Vout

Vctrl

Vin

Vin

1

2

3

4

5

6

7

SD

Enable

Q1