6-Bit, Programmable 2-/3-/4-Phase,

Synchronous Buck Controller

ADP3190

FEATURES

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

1 MHz per phase

±9.5 mV worst-case differential sensing error

over temperature

Logic-level PWM outputs for interface to external

high power drivers

transient performance

Active current balancing between all output phases

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

VID code changes

6-bit digitally programmable 0.8375 V to 1.6 V output

Programmable short circuit protection with programmable

latch-off delay

APPLICATIONS

Desktop PC power supplies for

Next-generation Intel® processors

VRM modules

Games consoles

GENERAL DESCRIPTION

The ADP3190/ADP3190A1 are highly efficient, multiphase,

synchronous buck switching regulator controllers optimized for

converting a 5 V or 12 V main supply into the core supply voltage

required by high performance Intel processors. They use an

internal 6-bit DAC to read a voltage identification (VID) code

directly from the processor, which is used to set the output

voltage between 0.8375 V and 1.6 V. The devices use 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 relationship 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 ADP3190/ADP3190A also include programmable, no-load

offset and slope functions to adjust the output voltage as a function

of the load current, so it is always optimally positioned for a

system transient. The ADP3190/ADP3190A also provide

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

PRECISION

REFERENCE

SOFT

START

DELAY

UVLO

SHUTDOWN

AND BIAS

OSCILLATOR

GND

ADP3190

DELAY

ILIMIT

PWRGD

RT

RAMPADJ

PWM2

PWM3

PWM4

SW1

CSSUM

CSCOMP

SW2

SW3

SW4

CSREF

PWM1

COMP

VID

DAC

DAC

+150mV

DAC

–250mV

CSREF

EN

CURRENT

LIMIT

CIRCUIT

CROWBAR

CURRENT

LIMIT

CMP

CMP

CURRENT

BALANCING

CIRCUIT

CMP

CMP

2-/3-/4-PHASE

DRIVER LOGIC

EN

SET

RESET

RESET

RESET

RESET

SHUNT

REGULATOR

(ADP3190 ONLY)

18

20

21

22

23

24

25

26

27

13

14

28

19

10

15

12

FBRTN

7

VID4

1

VID3

2

VID2

3

VID1

4

VID0

5

VID5

6

FB

8

9

17

16

Figure 1.

The ADP3190 is a replacement for the ADP3188. A built-in

shunt regulator allows the part to be connected to the 12 V

system supply through a series resistor.

The devices are specified over the commercial temperature

range of 0°C to +85°C and are available in a 28-lead TSSOP and

a 28-lead QSOP.

Rev. 0

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