22

21

30

28

13

14

8

7

CS2+

PG2

FB2

COMP2

LDRV1

PGND1

ILIM1

CS1+

TPS40322

27

4

5

2

1

32

10

SYNC

PHSET

EN/SS2

PG1

FB1

COMP1

RT

6

AGND

3

EN/SS1

12

CS2–

29

CS1–

31

24

25

23

UVLO

HDRV1

BOOT1

SW1

18

19

11

LDRV2

PGND2

ILIM2

16

15

17

HDRV2

BOOT2

SW2

20

BP6

26

VDD

3 V

to

20 V

UDG-10215

9

DIFFO

TPS40322

www.ti.com

SLUSAF8

– JUNE 2011

Dual Output or Two-Phase Synchronous Buck Controller

1

FEATURES

DESCRIPTION

The TPS40322 is a dual-output, synchronous buck

•

Dual- or Multi-phase Synchronous Buck

controller.

It

can

also

be

configured

as

a

Controller

single-output,

two-phase

controller.

The

180

°

•

180

° Out-of-Phase Reduces Input Ripple

out-of-phase operation reduces the input current

•

Input Voltage Range from 3 V to 20 V

ripple and extends the input capacitor lifetime.

•

Output Voltage Range: 0.6 V to 5.6 V

Bi-directional master/slave synchronization function

provides

evenly

distributed

phase

shift

for

a

•

Adjustable Frequency 100 kHz to 1 MHz

four-output system that reduces input ripple further

•

Bidirectional SYNC with 0

°/180° or 90°/270°

and attenuates the system noise.

Phase Shift

•

Voltage Mode Control With Input Feed-forward

The wide input range can support 3.3-V, 5-V, and

12-V buses. The accurate reference voltage satisfies

•

Accurate Current Sharing for Multi-phase

the precision voltage need of the modern ASICs and

Operation

potentially

reduces

the

output

capacitance

•

Individual PowerGood Outputs

requirement.

Separate

PGOOD

signals

provide

•

Individual Enable and Programmable Soft

flexibility for system monitoring and sequencing. The

Start, With Pre-bias Start-up

two channels are independently controlled and each

•

±0.5%, 600-mV Reference

soft-start time is programmable. Voltage mode control

is implemented to reduce noise sensitivity and also

•

Output UV/OV Protection and Input

ensures low duty ratio conversion.

Undervoltage Lockout

•

Individual Overcurrent Limit Setting

.

•

Hiccup Overcurrent Protection

SIMPLIFIED APPLICATION CIRCUIT

•

Accurate Inductor DCR or Resistive Current

Sensing

•

Remote Sense for Multi-phase Applications

•

Internal N-Channel FET Drivers

•

Integrated Bootstrap Switches

•

Available in 5 mm

× 5 mm 32-Pin QFN Package

APPLICATIONS

•

Multiple Rail Systems

•

Telecom Base Station

•

Switcher/Router Networking

•

xDSL Broadband Access

•

Server and Storage System

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright

© 2011, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.