TPS53511

16

13

15

14

1

2

3

4

VCC

VREG5

VO

VFB

VIN

VIN

GND

SS

5

8

6

7

EN

PG

PGND

PGND

12

11

10

9

SW

VBST

SW

SW

UDG-13043

–

+

Input Signal

Output Signal

–

+

PGND

SGND

TPS53511

www.ti.com

SLUSBG4 – MARCH 2013

4.5-V to 18-V Input, 1.5-A Step-Down Regulator with Integrated Switcher

Check for Samples: TPS53511

1

FEATURES

APPLICATIONS

2

•

Continuous 1.5-A Output Current

•

Points-of-Load for Server

•

4.5-V to 18-V Supply Voltage Range

•

Distributed Non-Isolated DC-DC Converters for

Computing Power System

•

2-V to 18-V Conversion Voltage Range

•

DCAP2™ Mode Control Enables Fast Transient

DESCRIPTION

Response

The TPS53511 is an adaptive on-time D-CAP2™

•

Low Output Ripple and Support all MLCC

mode synchronous buck converter. The device is

Output Capacitor

suitable for points-of-load (POL) in computing power

•

Skip Mode for Light Load Control

systems,

and

provides

a

cost-effective,

low

component count, low standby current solution. The

•

Highly Efficient Integrated FETs Optimized for

main control loop for the TPS53511 uses the D-

Lower Duty Cycle Applications

CAP2™ mode control providing a fast transient

•

High Efficiency, Less than 10-µA Supply

response with no external components. The adaptive

Current at Shutdown

on-time control supports seamless operation between

PWM mode during heavy load conditions and

•

Adjustable Soft-Start Time

reduced

frequency

operation

during

light

load

•

Support Pre-Biased Soft Start

conditions for high efficiency.

•

700-kHz Switching Frequency

The TPS53511 includes a proprietary circuit that

•

Cycle-By-Cycle Overcurrent Limit

enables the device to adapt to both low equivalent

•

Open Drain Power Good Indication

series resistance (ESR) output capacitors, such as

POSCAP or SP-CAP, and ultra-low ESR ceramic

•

Internal Bootstrap Switch

capacitors. The device operates from 4.5-V to 18-V

•

Small 3 mm × 3 mm, 16-Pin QFN (RGT)

supply input, and from 2-V to 18-V input power supply

Package

voltage. The device features an adjustable slow start

time and a power good function. It also supports pre-

biased soft start. The TPS53511 is available in the

16-pin QFN package, and designed to operate from

–40°C to 85°C.

TYPICAL APPLICATION

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

DCAP2, PowerPAD are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2013, 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.