1

FEATURES

APPLICATIONS

DESCRIPTION

TPS51222RTV

1

2

3

4

24

23

22

21

VIN

VREG3

EN2

DRVH1

V5SW

RF

EN1

5

6

7

8

PGOOD1

SKIPSEL1

CSP1

CSN1

20

19

18

17

PGOOD2

SKIPSEL2

CSP2

CSN2

25

26

27

28

29

30

31

32

16

15

14

13

12

11

10

9

DRVH2

SKIPSEL2

PGOOD2

EN2

VREG3

3.3V/

10mA

VBAT

SKIPSEL1

PGOOD1

EN1

VO1

VO1

IMON1

VO1

5V

VBAT

EN

IMON2

VO2

3.3V

VBAT

VREG5

5V/

100mA

UDG-09009

VO2

TPS51222

www.ti.com............................................................................................................................................................................................... SLUS908 – JANUARY 2009

Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller

2

• Input Voltage Range: 4.5 V to 32 V

• Notebook Computer System and I/O Bus

• Output Voltage Range: 1 V to 12 V

• Point of Load in LCD TV, MFP

• Selectable Light Load Operation

(Continuous / Auto Skip / Out-Of-Audio™ Skip)

• Programmable Droop Compensation

The TPS51222 is a dual synchronous buck regulator

• Voltage Servo Adjustable Soft Start

controller with two LDOs. It is optimized for 5-V/3.3-V

• 200-kHz to 1-MHz Fixed-Frequency PWM

system

controller,

enabling

designers

to

cost

• Current Mode Architecture

effectively complete 2-cell to 4-cell notebook system

power

supply.

The

TPS51222

supports

high

• 180° Phase Shift Between Channels

efficiency, fast transient response, and 99% duty

• Resistor or Inductor DCR Current Sensing

cycle operation. It supports supply input voltage

• Current Monitor Output for Each Channel

ranging from 4.5 V to 32 V, and output voltages from

1 V to 12 V. Peak current mode supports stability

• Adaptive Zero Crossing Circuit

operation with lower ESR capacitor and output

• Powergood Output for Each Channel

accuracy. The high duty cycle (99%) operation and

• OCL/OVP/UVP/UVLO Protections

the wide input/output voltage range supports flexible

• Thermal Shutdown (Non-Latch)

design for small mobile PCs and a wide variety of

other applications. The fixed frequency can be

• Output Discharge Function

adjusted from 200 kHz to 1 MHz by a resistor, and

• Integrated Boot Strap MOSFET Switch

each channel runs 180° out-of-phase. The TPS51222

• QFN-32 (RTV) Package

can also synchronize to the external clock, and the

interleaving ratio can be adjusted by its duty. The

TPS51222 is available in the 32-pin 5 × 5 QFN

package and is specified from –40°C to 85°C.

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.

2

Out-Of-Audio, PowerPAD are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009, 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.