V

= 1.5 V (50

Iout (2 A/div)

Input Voltage

PGND

PGND

C4

SW1

VIN1

VBST1

EN1

VFB2

VFB1

GND

VREG5

PGND1

6

VIN2

VBST2

EN2

SW2

SS1

5

1

3

SS2

9

10

11

PGND2

2

4

7

13

12

TPS542951

HTSSOP16

14

8

15

16

PGND

SGND

SGND

C11

VO1

C21

R11

R21

L11

C31

C32

L12

C12

VO2

C22

R12

R22

(PowerPAD)

SGND

SGND

TPS542951

www.ti.com

SLVSBI4B – JULY 2012 – REVISED OCTOBER 2013

2A/3A Dual Channel Synchronous Step-Down Switcher with Integrated FET

Check for Samples: TPS542951

1

FEATURES

APPLICATIONS

2

•

D-CAP2™ Control Mode

•

Point-of-Load Regulation in Low Power

Systems for Wide Range of Applications

–

Fast Transient Response

–

Digital TV Power Supply

–

No External Parts Required For Loop

Compensation

–

Networking Home Terminal

–

Compatible with Ceramic Output

–

Digital Set Top Box (STB)

Capacitors

–

DVD Player/Recorder

•

Wide Input Voltage Range : 4.5 V to 18 V

–

Gaming Consoles and Other

•

Output Voltage Range : 0.76V to 7.0V

DESCRIPTION

•

Highly Efficient Integrated FETs Optimized for

The TPS542951 is a dual, adaptive on-time D-

Low Duty Cycle Applications

CAP2™ mode synchronous buck converter. The

–

150 m

Ω (High Side) and 100 mΩ (Low Side)

TPS542951 enables system designers to complete

•

High Initial Reference Accuracy

the suite of various end equipment’s power bus

regulators with a cost effective, low component count,

•

Supports Constant 2 A CH1 and 3 A CH2 Load

and low standby current solution. The main control

Current

loops of the TPS542951 use the D-CAP2™ mode

•

control which provides a very fast transient response

•

Adjustable Soft Start

with no external compensation components. The

adaptive on-time control supports seamless transition

•

Non-Sinking Pre-Biased Soft Start

between PWM mode at higher load conditions and

•

700 kHz Switching Frequency

Eco-mode™ operation at light loads. Eco-mode™

•

Cycle-by-Cycle Over-Current Limit Control

allows the TPS542951 to maintain high efficiency

•

OCL/UVLO/TSD Protections

during lighter load conditions. The TPS542951 is able

to adapt to both low equivalent series resistance

•

Hiccup Timer for Overload Protection

(ESR) output capacitors such as POSCAP or SP-

•

Adaptive Gate Drivers with Integrated Boost

CAP, and ultra-low ESR, ceramic capacitors. The

PMOS Switch

device provides convenient and efficient operation

•

OCP Constant Due To Thermally Compensated

with input voltages from 4.5V to 18V.

℃

The TPS542951 is available in a 4.4mm × 5.0mm 16

•

16-Pin HTSSOP, 16-Pin VQFN

pin TSSOP (PWP) package, and 4mm x 4mm 16 pin

VQFN (RSA) package, and is specified for an

•

Auto-Skip Eco-mode™

　

　for High Efficiency at

ambient temperature range from –40°C to 85°C.

Light Load

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-CAP2, Eco-mode, PowerPAD are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2012–2013, 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.