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ADP3193A

8-Bit, Programmable, 2-Phase to 3-Phase, Synchronous Buck Controller

Analog Devices 

8-Bit, Programmable, 2- to 3-Phase,

Synchronous Buck Controller

ADP3193A

FEATURES

Selectable 2- or 3-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

Fast enhanced PWM (FEPWM) 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 ADP3193A1 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

performance 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- or

3-phase operation, allowing for the construction of up to three

complementary buck switching stages.

The ADP3193A 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

ADP3193A also provides accurate and reliable short-circuit

protection, adjustable current limiting, and delayed power-good

output that accommodates on-the-fly output voltage changes

requested by the CPU.

FUNCTIONAL BLOCK DIAGRAM

GND 14

VCC

23

SHUNT

REGULATOR

UVLO

SHUTDOWN

850mV –

EN 1

+

DAC

–

+150mV

+

CSREF +

DAC –

–350mV

PWRGD 2

DELAY

ILIMIT 8

DELAY 7

RT RAMPADJ

9

10

OSCILLATOR

+

CMP

–

SET EN

RESET

15 OD

22 PWM1

+

CMP

–

+

CMP

–

21 PWM2

RESET

20 PWM3

2-/3-PHASE

DRIVER LOGIC

RESET

CROWBAR

CURRENT

LIMIT

CURRENT

MEASUREMENT

AND LIMIT

19 SW1

18 SW2

17 SW3

13 CSCOMP

11 CSREF

12 CSSUM

IREF 16

COMP 5

4 FB

FBRTN 3

PRECISION

REFERENCE

BOOT

VOLTAGE

AND

SOFT START

CONTROL

6 SS

VIDSEL 32

VC DAC

ADP3193A

24 25 26 27 28 29 30 31

VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0

Figure 1.

The ADP3193A has a built-in shunt regulator that allows the

part to be connected to the 12 V system supply through a series

resistor.

The ADP3193A is specified over the extended commercial

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

32-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

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Fax: 781.461.3113

©2007 Analog Devices, Inc. All rights reserved.

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