1 Features

• Operating input supply voltage range

(4.5 V to 18 V)

• Feedback reference voltage 0.6 V±1%

• Maximum continuous output current 3 A/2 A/2 A

• Adjustable clock frequency from 250 kHz to 2 MHz

• dedicated enable and soft start pins for each buck

• Automatic power-up, power-down sequence

• Pulse Skipping Mode (PSM) at Light Load

(TPS65261 only)

• Output voltage power-good indicator

• Input voltage power failure indicator

• Thermal overloading protection

2 Applications

• DTV

• Set top boxes

• Home gateway and access point networks

• Wireless routers

• Surveillance

• POS machine

3 Description

The TPS65261, TPS65261-1 is a monolithic triple

synchronous step-down (buck) converter with 3-

A/2-A/2-A output currents. A wide 4.5-V to 18-

V input supply voltage range encompasses the

most intermediate bus voltages operating off 5-

V, 9-V, 12-V or 15-V power bus. The converter,

with constant frequency peak current mode, is

designed to simplify its application while giving

designers options to optimize the system according

to targeted applications. The switching frequency of

the converters can be adjusted from 250 kHz to 2

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

operation between Buck1 and Buck2, 3 (Buck2 and 3

run in phase) minimizes the input filter requirements.

The TPS65261, TPS65261-1 features an automatic

power sequence with connecting MODE pin to

V7V and configuring EN1/2/3 pins. The device also

features an open drain RESET signal to monitor

power down.

At light load, the TPS65261 automatically operates

in pulse skipping mode (PSM) and the TPS65261-1

operates in force continuous current mode (FCC).

PSM mode provides high efficiency by reducing

switching losses at light loads and FCC mode reduces

noise susceptibility and RF interference.

The device features overvoltage protection,

overcurrent and short-circuit protection and overtemperature

protection. A power-good pin asserts

when any output voltages are out of regulation.