ADP3198 datasheet(1/32 Pages) AD

Nome de Peças	ADP3198

Descrição Electrónicos	8-Bit Programmable 2- to 4-Phase Synchronous Buck Controller

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Fabricante Electrônico	AD [Analog Devices]

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8-Bit Programmable 2- to 4-Phase

Synchronous Buck Controller

ADP3198

FEATURES

Selectable 2-, 3-, or 4-phase operation at up to

1 MHz per phase

±11 mV worst-case differential sensing error over

temperature

Logic-level PWM outputs for interface to external high

power drivers

Enhanced PWM flex mode for excellent load transient

performance

Active current balancing between all output phases

Built-in power-good/crowbar blanking supports on-the-fly

VID code changes

Digitally programmable 0.5 V to 1.6 V output supports both

VR10.x and VR11 specifications

Programmable short-circuit protection with programmable

latch-off delay

APPLICATIONS

Desktop PC power supplies for next generation

Intel® processors

VRM modules

GENERAL DESCRIPTION

The ADP31981 is a highly efficient, multiphase, synchronous buck

switching regulator controller optimized for converting a 12 V

main supply into the core supply voltage required by high per-

formance Intel processors. It uses an internal 8-bit DAC to read

a voltage identification (VID) code directly from the processor,

which is used to set the output voltage between 0.5 V and 1.6 V.

This device uses a multimode PWM architecture to drive the

logic-level outputs at a programmable switching frequency that

can be optimized for VR size and efficiency. The phase relation-

ship of the output signals can be programmed to provide 2-, 3-,

or 4-phase operation, allowing for the construction of up to

four complementary buck switching stages.

The ADP3198 also includes programmable no load offset and

slope functions to adjust the output voltage as a function of the

load current, optimally positioning it for a system transient. The

ADP3198 also provides accurate and reliable short-circuit

protection, adjustable current limiting, and a delayed power-

good output that accommodates on-the-fly output voltage

changes requested by the CPU.

1 Protected by U.S. Patent Number 6,683,441; other patents pending.

FUNCTIONAL BLOCK DIAGRAM

SHUNT

REGULATOR

VID DAC

DAC

+ 150mV

850mV

DAC

– 500mV

CSREF

2/3/4-PHASE

DRIVER LOGIC

EN

SET

18

1

2

10

9

8

11

7

20

5

3

40

–

+

–

+

UVLO

SHUTDOWN

19

30

29

28

27

25

24

23

22

17

15

16

21

4

14

6

BOOT

VOLTAGE

AND

SOFT START

CONTROL

THERMAL

THROTTLING

CONTROL

DELAY

RESET

VID7

32

VID6

33

VID5

34

VID4

35

VID3

36

VID2

37

VID1

38

VID0

39

ADP3198

+

–

CMP

+

–

CMP

+

–

CMP

+

–

CMP

CROWBAR

CURRENT

LIMIT

CURRENT

MEASUREMENT

AND LIMIT

PRECISION

REFERENCE

31

12

13

+

–

GND

EN

DELAY

ILIMIT

PWRGD

COMP

FBRTN

VIDSEL

IREF

TTSENSE

VRHOT

VRFAN

PWM2

PWM3

PWM4

SW3

SW2

SW1

CSREF

CSCOMP

SW4

CSSUM

FB

PWM1

SS

LLSET

IMON

OD

VCC

RAMPADJ

RT

OSCILLATOR

Figure 1.

The ADP3198 has a built-in shunt regulator that allows the part

to be connected to the 12 V system supply through a series resistor.

The ADP3198 is specified over the extended commercial

temperature range of 0°C to 85°C and is available in a

40-lead LFCSP.

Rev. A

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113

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