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PROGRAMMABLE SYNCHRONOUS

DC/DC HYSTERETIC CONTROLLER

WITH VRM 9.0 VID RANGE

PRELIMINARY - August 7, 2000

SC1155

DESCRIPTION

The SC1155 is a synchronous-buck switch-mode con-

troller designed for use in single ended power supply

applications where efficiency is the primary concern.

The controller is a hysteretic type, with a user se-

lectable hysteresis. The SC1155 is ideal for implement-

ing DC/DC converters needed to power advanced mi-

croprocessors such as Pentium

廬

llI and Athlon

廬

, in both

single and multiple processor configurations. Inhibit,

under-voltage lockout and soft-start functions are in-

cluded for controlled power-up.

SC1155 features include an integrated 5 bit D/A con-

verter, temperature compensated voltage reference,

current limit comparator, over-current protection, and

an adaptive deadtime circuit to prevent shoot-through

of the power MOSFET during switching transitions.

Power good signaling, logic compatible shutdown, and

over-voltage protection are also provided. The inte-

grated D/A converter provides programmability of out-

put voltage from 1.1V to 1.85V in 25mV increments.

The SC1155 high side driver can be configured as

either a grounded reference or as a floating bootstrap

driver. The high and low side MOSFET drivers have a

peak current rating of 2 amps.

FEATURES

鈥?

Programmable hysteresis

鈥?

5 bit DAC programmable output (1.1V-1.85V)

鈥?

On-chip power good and OVP functions

鈥?

Designed to meet latest Intel specifications

鈥?

Up to 95% efficiency

鈥?

+1% voltage tolerance over temperature

APPLICATIONS

鈥?

Server Systems and Workstations

鈥?

Intel Pentium

廬

III Core Supplies

鈥?

AMD Athlon

廬

Core Supplies

鈥?

Multiple Microprocessor Supplies

鈥?

Voltage Regulator Modules

ORDERING INFORMATION

DEVICE

(1)

PACKAGE

SO-28

TEMP. RANGE (T

J

)

0 - 125擄C

SC1155CSW.TR

SC1155EVB

Evaluation Board

TYPICAL APPLICATION CIRCUIT

Note:

(1) Only available in tape and reel packaging. A reel

contains 1000 devices.

U1

SC1155CSW

1

R1

2k

R3

2.7k

2

3

R2

1k

C2

0.01

R4

1k

C3

0.01

R5

100

C4

0.01

R6

20k

C6

0.1

4

5

6

7

C5

0.001

8

C7

0.1

C8

0.01

+5V

9

10

11

12

13

14

IOUT

DROOP

OCP

VHYST

VREFB

VSENSE

AGND

SOFTST

N/C

LODRV

LOHIB

DRVGND

LOWDR

DRV

PWRGD

VID0

VID1

VID2

VID3

VID4

INHIBIT

IOUTLO

LOSENSE

HISENSE

BOOTLO

HIGHDR

BOOT

VIN12V

28

27

26

25

24

23

22

21

20

19

18

17

16

+12V

15

Q2

R12 IRL2203S

3.9

C9

2.2uF

GND

R7

150

C21-C26

150uF/4V

C27

0.1

Q1

R11 IRL3103S

2.2

C13

0.33

L2

1.5uH

Vout

C12

0.33

GND

C16

0.1

L1

1uH

Vin

C17-C19

150uF/16V

C20

0.1

R10

10k

INHIB

R9

10k

+5V

PWRGD

Vin +5 to +12V

R8

10k

Vout = 1.1 to 1.85V

C8

2.2uF

Athlon is a registered trademark of AMD Corporation

Pentium is a registered trademark of Intel Corporation

1

漏 2000 SEMTECH CORP.

TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

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