1

2

3

14

13

12

VBST

DRVH

LL

EN_PSV

TON

VOUT

TPS51117RGY

4

5

6

7

11

10

9

8

TRIP

V5DRV

DRVL

PGND

V5FILT

VFB

PGOOD

GND

+

VOUT

0.75V~5.5V

Q2

L1

Q1

-

PGND

C2

C4

C1

R6

PGOOD

+5V

EN_PSV

R4

R1

R2

R3

R5

VIN

1.8V~28V

C3

GND

+

+

GND

GND

TPS51117

SINGLE SYNCHRONOUS STEP-DOWN CONTROLLER

Check for Samples :TPS51117

1

FEATURES

DESCRIPTION

2

•

High Efficiency, Low Power Consumption,

4.5-

μA Typical Shutdown Current

The TPS51117 is a cost effective, synchronous buck

controller for POL voltage regulation in notebook PC

•

Fixed Frequency Emulated On-Time Control,

applications. The controller is dedicated for Adaptive

Adjustable from 100 kHz to 550 kHz

On-Time D-CAP™ Mode operation that provides

•

D-CAP™ Mode with 100-ns Load Step

ease of use, low external component count, and fast

Response

transient response. Auto-skip mode for high efficiency

•

< 1% Initial Reference Accuracy

down to the milli-ampere load range, or PWM-only

mode for low noise operation is selectable.

•

Output Voltage Range: 0.75 V to 5.5 V

•

Wide Input Voltage Range: 1.8 V to 28 V

The current sensing scheme for positive overcurrent

and negative overcurrent protection is loss-less

•

Selectable Auto-Skip/PWM-Only Operation

low-side

sensing

plus

temperature

•

Temperature Compensated (4500 ppm/°C)

compensation. The device receives a 5-V (4.5 V to

5.5 V) supply from another regulator such as the

•

Negative Overcurrent Limit

TPS51120 or TPS51020. The conversion input can

be either VBAT or a 5-V rail, ranging from 1.8 V to

•

Integrated Boost Diode

28 V, and the output voltage range is from 0.75 V to

•

Integrated OVP/UVP and Thermal Shutdown

5.5 V.

•

Power-Good Signal

The TPS51117 is available in a 14-pin QFN or a

•

Internal 1.2-ms Voltage Softstart

14-pin TSSOP package and is specified from –40°C

•

Integrated Output Discharge (Softstop)

to 85°C.

APPLICATIONS

•

Notebook Computers

•

I/O Supplies

•

System Power Supplies

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

D-CAP is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2005–2009, 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.