LX1

FB1

LX2

FB2

LX3

FB3

PVINx

VIN

ENx

PGOOD

MODE

SSx

ROSC

VDIV

RESET

PGND

AGND

Vin

Vout1

Vout3

TPS65261

TPS65261-1

Vout2

0

10

20

30

40

50

60

70

80

90

100

0.01

0.1

1

Output Load (A)

TPS65261

C001

V

V

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TPS65261, TPS65261-1

SLVSCD3B – DECEMBER 2013 – REVISED MAY 2014

TPS6526x 4.5V to 18V Input Voltage, 3A/2A/2A Output Current

Triple Synchronous Step-Down Converter

1 Features

3 Description

The TPS65261, TPS65261-1 is a monolithic triple

1

•

Operating Input Supply Voltage Range

synchronous

step-down

(buck)

converter

with

(4.5 V to 18 V)

3A/2A/2A output currents. A wide 4.5V to 18V input

•

Feedback Reference Voltage 0.6V±1%

supply

voltage

range

encompasses

the

most

•

Maximum Continuous Output Current 3A/2A/2A

intermediate bus voltages operating off 5V, 9V, 12V

or 15V power bus. The converter, with constant

•

Adjustable Clock Frequency from 250kHz to

frequency peak current mode, is designed to simplify

2MHz

its application while giving designers options to

•

Dedicated Enable and Soft Start Pins for Each

optimize

the

system

according

to

targeted

Buck

applications.

The

switching

frequency

of

the

•

Automatic Power-up/Power-down Sequence

converters can be adjusted from 250kHz to 2MHz

with an external resistor. The 180° out-of-phase

•

Pulse Skipping Mode (PSM) at Light Load

operation between Buck1 and Buck2, 3 (Buck2 and 3

(TPS65261 only)

run in phase) minimizes the input filter requirements.

•

Output Voltage Power Good Indicator

The TPS65261, TPS65261-1 features an automatic

•

Input Voltage Power Failure Indicator

power sequence with connecting MODE pin to V7V

•

Thermal Overloading Protection

and configuring EN1/2/3 pins. The device also

features an open drain RESET signal to monitor

2 Applications

power down.

•

DTV

At light load, the TPS65261 automatically operates in

pulse skipping mode (PSM) and the TPS65261-1

•

Set Top Boxes

operates in force continuous current mode (FCC).

•

Home Gateway and Access Point Networks

PSM mode provides high efficiency by reducing

•

Wireless Routers

switching losses at light loads and FCC mode

•

Surveillance

reduces noise susceptibility and RF interference.

•

POS Machine

The

device

features

overvoltage

protection,

overcurrent and short-circuit protection and over-

temperature protection. A power good pin asserts

when any output voltages are out of regulation.

PART NUMBER

PACKAGE

BODY SIZE (NOM)

TPS65261,

VQFN (32)

5.00 mm × 5.00 mm

TPS65261-1

(1)

For all available packages, see the orderable addendum at

the end of the datasheet.

4 Typical Application

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.