ADP3192 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADP3192

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

Analog Devices

ADP3192 Datasheet PDF : 32 Pages

1 2 3 4 5 6 7 8 9 10 Next Last

8-Bit Programmable 2- to 4-Phase

Synchronous Buck Controller

ADP3192

FEATURES

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

1 MHz per phase

±7.7 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 ADP31921 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 ADP3192 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

ADP3192 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.

FUNCTIONAL BLOCK DIAGRAM

VCC

RT RAMPADJ

GND 18

SHUNT

REGULATOR

UVLO

SHUTDOWN

850mV –

EN 1

DAC

–

+ 150mV

CSREF +

DAC –

– 350mV

PWRGD 2

DELAY

OSCILLATOR

19 OD

CMP

–

CMP

–

CMP

–

CMP

–

SET EN

RESET

30 PWM1

RESET

29 PWM2

RESET

28 PWM3

2/3/4-PHASE

DRIVER LOGIC 27 PWM4

RESET

CROWBAR

CURRENT

LIMIT

TTSENSE 10

VRHOT 9

VRFAN 8

THERMAL

THROTTLING

CONTROL

25 SW1

24 SW2

23 SW3

22 SW4

ILIMIT 11

DELAY 7

CURRENT

MEASUREMENT

AND LIMIT

17 CSCOMP

15 CSREF

16 CSSUM

21 IMON

IREF 20

COMP 5

4 FB

FBRTN 3

PRECISION

REFERENCE

VIDSEL 40

VID DAC

32 33 34 35 36 37 38 39

VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0

BOOT

VOLTAGE

AND

SOFT START

CONTROL

14 LLSET

6 SS

ADP3192

Figure 1.

The ADP3192 has a built-in shunt regulator that allows the part

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

The ADP3192 is specified over the extended commercial

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

40-lead LFCSP.

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

Rev. 0

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

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

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

Trademarks and registered trademarks are the property of their respective owners.

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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