INFINEON TDA21302 User Manual

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Version 1.2 , May 2004

Datasheet

DS-CoreControl-TDA21302

TDA21302

Authors: Edward Chang

Published by Infineon Technologies AG

http://www.infineon.com/DCDC

Power Management & Supply

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Page 1 of 25 DS-CoreControl-TDA21302

Never stop thinking.

Contents:

Features………………………………………………………………………………………………………......3

Application……………………………………………………………………………………………………...…3

Pinout Drawing and Description………………………………………………………………………………..3

General Description……………………………………………………………………………………………...5

Block Diagram…………………………………………………………………………………………………….5

Reference Schematic……………………………………………………………………………………………6

Absolute Maximum Rating.................................................................................................................... 7

Thermal Characteristic.......................................................................................................................... 7

Electrical Characteristic ........................................................................................................................ 7

Operating Condition.............................................................................................................................. 9

VRD10,x VID Table ............................................................................................................................ 10

Application Information ....................................................................................................................... 11

Voltage Control………………………………………………………………………………………..11 Current Balance……………………………………………………………………………………….12

Load Droop…………………………………………………………………………………………….12 Fault Detection………………………………………………………………………………………...12

Phase Setting and Converter Start Up……………………………………………………………...13 Current Sensing Setting………………………………………………………………………………13

DAC Offset Voltage & Droop Tuning………………………………………………………………..14 Protection and SS Function………………………………………………………………………….15

Design Procedure Suggestion ............................................................................................................ 16

Design Example.................................................................................................................................. 17

Layout Guide ...................................................................................................................................... 20

Outline Diemension……………………………………………………………………………………………..22

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Page 2 of 25 DS-CoreControl-TDA21302

Multi-Phase PWM Controller for CPU Core

Power Supply

P-DSO-32

Features :

• Multi-Phase PWM Conversion with Automatically Phase Selection

• VRD10.X Compliant

• Active Droop Compensation For Fast Load Response

• Smooth V

• Power Stage Thermal Balance By Sync FET Rds(on) Current Sense Technique

• Hiccup Mode Over Current Protection

• Programmable Switching Frequency ( 50KHz ~ 400KHz per Phase ), Under

Voltage Lockout, and Soft-Start

• High Output Ripple Frequency times numbers of working Channels

Application :

• Intel Processor Voltage Regulator : VRM10.X

• Low Output Voltage High Output Current DC-DC Converters

• Voltage Regulator Modules

Voltage Transition during the VID On The Fly

CORE

Type Package Marking Ordering Code

TDA21302 P-DSO-32 21302 Q67042-S4229

Pinout Drawing and Description :

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Page 3 of 25 DS-CoreControl-TDA21302

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Page 4 of 25 DS-CoreControl-TDA21302

Number Name Description

1 OVP

2 PGOOD

3 VID4

4 VID3

5 VID2

6 VID1

7 VID0

8 VID125

9 VOSS

10 ADJ

11 SS

12 FB

13 COMP

14 VDIF

15 ISN4

16 ISN3

Over voltage trip output

Open drain power good signal output pin

Voltage Identification DAC Input. Internally pull up to 3V.

Connect a resistor to GND to set the initial offset voltage.

Connect a resistor to GND to set the Droop Voltage.

Soft-Start. Connect with a capacitor to GND to set the Soft-Start Interval. Pulling down this pin

below 1V shall shut the converter down.

Internal error amplifier inverting input pin

Output of the error amplifier and input of the PWM comparator

Output pin of the differential converter output voltage sense

Differential current sense negative input pin connects to the drain pin of channel 4 Sync FET

Differential current sense negative input pin connects to the drain pin of channel 3 Sync FET

17 ISN2

18 ISN1

19 VSEN

20 SGND

21 GND

22 PWM3

23 ISP3

24 ISP1

25 PWM1

26 PWM2

27 ISP2

28 ISP4

29 PWM4

30 VCC

31 DVD

Differential current sense positive input pin connects to the drain pin of channel 2 Sync FET

Differential current sense positive input pin connects to the drain pin of channel 1 Sync FET

The positive input pin of the differential converter output voltage sense amplifier

The negative input pin of the differential converter output voltage sense amplifier

Ground pin of the IC

Channel 3 PWM output pin. Connect to high level for 2 phase operation.

Differential current sense positive input pin connects to the source pin of channel 3 Sync FET

Differential current sense positive input pin connects to the source pin of channel 1 Sync FET

Channel 1 PWM output pin

Channel 2 PWM output pin

Differential current sense positive input pin connects to the source pin of channel 2 Sync FET

Differential current sense positive input pin connects to the source pin of channel 4 Sync FET

Channel 4 PWM output pin. Connect to high level for 2 or 3 phase operation.

IC power supply pin connects to 5V

Connect the external voltage divider to program the controller under voltage lockout based on

the input voltage of the power stage voltage

32 RT

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Connect a resistor to GND to set the channel switching frequency

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Page 5 of 25 DS-CoreControl-TDA21302

g

A

General Description

TDA21302 is a multi-phase DC-DC buck converter controller integrated all control functions for the next generation GHz CPU

voltage regulator. TDA21302 automatically controls 2 to 4 interleaved buck switching power stage operation. The multi-phase

architecture is able to provide high output current with lower power dissipation on the switching devices and minimizing the

input ripple current and output ripple voltage. The equivalent high operation frequency optimizes the voltage regulator design

for better transient response and thermal performance.

TDA21302 utilizes the Sync FET Rds(on) in every channel as the current sense element. The differential current sense in

every channel results precious channel current information to the controller for good droop adjustment, channel current

balance, channel switching devices thermal balance and over current protection.

Block Diagram

VOSS

SGND

VSEN

VID0 VID1 VID2 VID3 VID4

VID DAC

& Step

Offset

Settin

VCC PGOOD

INH

+

I

RT DVD

Oscillatior

& Sawtooth

+

Current

Correction

SUM/M

INH

I

PWM Logic

PWM CMP

INH

PWM Logic

PWM CMP

INH

PWM Logic

PWM CMP

INH

PWM Logic

PWM CMP

+

I

+

I

+

I

+

I

PWM1

PWM2

PWM3

PWM4

ISN1

ISP1

ISN2

ISP2

ISN3

ISP3

ISN4

ISP4

OVP

Power On

Reset

OVP

Settin

PG

Settin

I

+

I

+

I

+

I

OCP

Settin

+

I

Soft

Start

VDIF COMP FB

SS

DJ

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Reference Schmatic

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Page 7 of 25 DS-CoreControl-TDA21302

Absolute Maximum Ratings

At Tj = 25 °C, unless otherwise specified

Parameter

Symbol

Voltage supplied to ‘VCC’ pin; DC VCC -0.3 7

Input, Output or I/O Pin -0.3 Vcc+0.3

Junction temperature TJ 0 125

Value

Min. Max.

Unit

V

°C

Storage temperature TS -65 150

ESD Rating; Human Body Model 2 KV

ESD Rating; Machine M Model 200 V

IEC climatic category; DIN EN 60068-1 55/150/56 -

Thermal Characteristic

Parameter

Symbol

Thermal resistance, junction-soldering point

Values

Unit

Min. Typ. Max.

K/W

Thermal resistance, junction-ambient 50

Electrical Characteristic

At Vcc=5V, Tj = 25 °C, unless otherwise specified

Parameter

Supply Characteristic

Bias supply current ICC PWM1,2,3,4 Open 12 16 mA

Power On Reset Characteristic

POR Threshold

Hysteresis V

V

Threshold V

DVD

V

Hysteresis V

DVD

Oscillator

Symbol

V

CCRTH

CCHYS

DVDTP

DVDHYS

Conditions

Values

Min. Typ. Max.

VCC rising threshold 4,0 4,2 4,5

Unit

V

0,2 0,5

Low to High Enable 1,9 2 2,1

V

falling threshold 0,1

VCC

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Page 8 of 25 DS-CoreControl-TDA21302