US2075

4-1

Rev. 1.2

4/26/98

PWM SWITCHER CONTROLLER & 7.5A

LOW DROPOUT REGULATOR COMBO

TYPICAL APPLICATION

TYPICAL APPLICATION

Typical application of US2075 in a flexible mother board designed for Intel P55

™,P54™

AMD K5,K6

™ as well as Cyrix M1™ and M2™ applications.

PACKAGE ORDER INFORMATION

PACKAGE ORDER INFORMATION

Tj (

7 PIN PLASTIC

7 PIN PLASTIC

TO220 (T)

TO263 (M)

0 TO 125

US2075CT

US2075CM

Notes: P54C,P55C are trade marks of Intel Corp. K5 & K6 are trade marks of AMD corp. Cyrix 6X86L,M1,M2 are trade marks of Cyrix

Corp. Power PC is trade mark of IBM Corp.

DESCRIPTION

DESCRIPTION

The US2075 is a dual function IC combining a switching

controller and a 7.5A low dropout regulator all in a com-

pact 7 pin TO220 and TO263 surface mount pack-

ages providing a total solution for dual supply proces-

sor applications such as an Intel P55C

™, AMD K6™,

as well as Cyrix 6X86L

™ and the M2™processors.

Typically in these applications a dual supply regulator

converts 5V to 3.3V for I/O supply and a jumper pro-

grammable supply of 2.8V to 3.5V for CORE supply .The

linear regulator portion in the US2075 is a fixed 3.30V

output and has a minimum of 7.5A current capability

designed to provide ample current for most applications

while the switching regulator controller uses the 5V sup-

ply to power the controller and the 12V supply to drive

the power MOSFET, allowing a low cost N- MOS switch

to be used. The IC also includes an error comparator for

fastest transient response, a precise voltage reference

for setting the output voltage as well as a direct drive of

the MOSFET for the minimum part count.

FEATURES

FEATURES

The US2075 eliminates the need for a

seperate switching controller IC

Minimum part count allows lower system cost

Fixed 3.30V/7.5A LDO on board

On board MOSFET driver

Fastest transient response of any controller

method. ( 0 to 100% Duty Cycle in 100 nS )

1% internal voltage reference

Internal Thermal shutdown

Internal Under Voltage Lockout protects

MOSFET during start-up

APPLICATIONS

APPLICATIONS

Dual supply low voltage processor applications,

such as: P55C

™,CYRIX M2™, POWER PC™ and

AMD

PATENT PENDING

5V

2.8V / 10A

12V

3.30V / 7.5A

2075ap1a-1.0

US2075

Drv

V12

Vfb

Gnd

Vhyst

Vout

V5

1

2

3

4

5

6

7