EN1

PGND2

PVIN2

PVIN2

ISHARE

V7V

VIN

PVIN1

EN2

PVIN1

FB2

RLIM2

BST2

LX2

LX2

COMP2

ROSC

COMP1

LX1

PGND1

LX1

BST1

L1

C19

C9

R16

R15

C14

DVCC

R23

C23

VIN

RLIM1

FB1

PGOOD1

PGOOD2

C20

R17

R18

C3

R2

R1

L2

C30

VOUT2

C29

R32

R31

C26

R26

R24

VOUT 1

TPS 65276

0

10

20

30

40

50

60

70

80

90

100

0

1

2

3

4

5

Loading (A)

Forced PWM

Auto PSM-PWM

C009

TPS65276

www.ti.com

SLVSC83A – AUGUST 2013 – REVISED DECEMBER 2013

4.5-V TO 18-V INPUT VOLTAGE, 6-A/3.5-A DUAL SYNCHRONOUS STEP-DOWN

CONVERTER

Check for Samples: TPS65276

1

FEATURES

•

4.5-V to 18-V Wide Input Voltage Range

•

180° Out-of-Phase Operation to Reduce Input

Capacitance and Power Supply Induced Noise

•

Programmable Slew Rate Control for Output

Voltage Transition

•

Over Temperature Protection

•

Up to 6-A Maximum Continuous Output

•

Available in 32-Pin Thermally Enhanced

Current in Buck 1 and 3.5-A in Buck 2

HTSSOP (DAP) and 36-Pin QFN 6-mm x 6-mm

(RHH) Packages

•

Pulse Skipping Mode to Achieve High

Efficiency in Light Load

APPLICATIONS

•

Adjustable Switching Frequency

•

DTV

200 kHz - 1.6 MHz Set by External Resistor

•

Telecom and Network

•

Dedicated Enable and Soft-Start for Each Buck

•

Point-of-Load

•

Peak Current-Mode Control with Simple

Compensation Circuit

•

Set Top Boxes

•

Cycle-by-Cycle Over Current Protection

•

Tablet PC

DESCRIPTION

TPS65276 is a monolithic dual synchronous buck converter with wide 4.5-V to 18-V operating input voltage

range that encompassed most intermediate bus voltage operating off 5-, 9-, 12- or 15-V power bus or battery.

The converter with constant frequency peak current mode control is designed to simplify its application while

giving the designers options to optimize their usage according to the target applications.

TPS65276 features dedicated enable pin. Independent soft-start pin provides flexibility in power up

programmability. Constant frequency peak current mode control simplifies the compensation and provides fast

transient response. Cycle-by-cycle over current protection and hiccup mode operation limit MOSFET power

dissipation in short circuit or over loading fault conditions. Low side reverse over current protection also prevents

excessive sinking current from damaging the converter. TPS65276 also features a light load pulse skipping mode

(PSM) controlled by MODE pin configuration.

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 © 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.