1 Features

1• Operating Input Voltage Range 2.7 to 6.5 V

• Feedback Reference Voltage 0.6 V ±1%

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

• Dedicated Enable and Soft Start

• Accurate Start-Up Timing Control With Enable

Pins Discharge

• Forced Continuous Current (FCC) Mode at Light

Load

• Cycle-by-Cycle Current Limiting With Hiccup

Mode Overcurrent Protection

• Adjustable Clock Frequency 250 kHz to 2.4 MHz

• External Clock Synchronization

• Power-Good Indicator

• Overtemperature Protection

2 Applications

• Printer and Scanner

• Digital TV

• Set Top Box

• Home Gateway and Access Point Networks

• Surveillance

3 Description

The TPS65266 incorporates 3 channels of high-

efficiency synchronous buck converter for

applications operating off the adaptor or battery with

input voltage lower than 6.5 V.

The buck DC/DC converter integrates power

MOSFETs for optimized power efficiency and

reduces external component counts. The peak

current mode control simplifies the compensation and

fast transient response. High clock frequency allows

smaller and low-value inductors and capacitors. External compensation supports optimized loop

compensation and fast transient response. In light

load condition, the buck converter operates in FCC

mode for a reduction in noise susceptibility and RF

interference. Cycle-by-cycle overcurrent limiting with

hiccup mode limits MOSFET power dissipation in

short circuit or overloading fault conditions.

The TPS65266 features a power-good supervisor

circuit that monitors all converter outputs. The

PGOOD pin is asserted after the output voltages in

each channel are in regulation and sequencing is

done.

When continuous heavy overload or short circuit

increases power dissipation in the buck converter,

internal thermal protection circuit shuts off the device

to prevent damage. Recovery from a thermal

shutdown is automatic after the device has cooled

sufficiently.