PH

PVIN

GND

BOOT

VSENSE

COMP

EN

RT/CLK

SS

PowerPAD

Css

Rrt

R3

C1

Cboot

Co

Lo

R1

R2

Cin

VIN

VIN

VOUT

PWRGD

SDA

SCL

VDD

Rp1

Rp2

SDA

SCL

VOUT

A1

A0

ADDR1

ADDR0

0

10

20

30

40

50

60

70

80

90

100

0

1

2

3

4

5

6

7

8

9

Output Current - A

C007

V

V

SIMPLIFIED SCHEMATIC

EFFICIENCY

Fsw = 500 kHz, V

= 1.1 V

OUT

TPS56921

www.ti.com

SLVSBL4 – OCTOBER 2012

4.5V to 17V Input, 9A Synchronous Step Down SWIFT™ Converter With VID Control

Check for Samples: TPS56921

1

FEATURES

•

Overcurrent Protection for Both MOSFETs

with Hiccup Mode for Severe Fault Conditions

•

•

Thermal and Overvoltage Protection

Interface: 0.72V to 1.48V in 10mV Steps

•

Adjustable Soft Start

•

•

Power Good Monitor for Under- and Over-

•

±1.5% Output Voltage over Temperature for

Voltage Conditions

VID Control

•

Operating Junction Temperature Range: –40°C

•

±1% Reference Voltage over Temperature for

to 125°C

External Regulation Mode

•

Available in 20-Pin HTSSOP Package with

•

Integrated 26m

Ω / 19mΩ MOSFETs

•

Power Input PVIN Voltage Range: 1.6V to 17V

•

Switching Frequency: 200kHz to 1.6MHz

APPLICATIONS

Internal Oscillator or Synchronizing to

•

Digital TVs

External Clock

•

Set Top Boxes

•

Shutdown Current: 2µA

•

SoC Power

•

Monotonic Start-Up into Pre-biased Output

Voltage

•

High Density Power Distribution Systems

DESCRIPTION

The TPS56921 in thermally enhanced 20-pin HTSSOP package is a full featured 17V, 9A synchronous step

down converter which is optimized for small designs through high efficiency and integrating the high-side and

low-side MOSFETs. After the initial power-up, the output voltage can be changed by codes sent to the IC via an

The output voltage startup ramp is controlled by the SS pin which helps to control startup inrush current. Power

sequencing is supported by configuring the enable and the open drain power good pins. The output voltage is

user-configurable at startup by external voltage divider.

Cycle by cycle current limiting on the high-side fet protects the TPS56921 in overload situations and is enhanced

by a low-side sourcing current limit which prevents current runaway. There is also a low-side sinking current limit

which turns off the low-side MOSFET to prevent excessive reverse current. Hiccup protection will be triggered if

the overcurrent condition has persisted for longer than the preset time. Thermal hiccup protection disables the

part when die temperature exceeds thermal shutdown temperature and enables the part again after the built-in

thermal hiccup time.

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 © 2012, 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.