1 Features

1• 4.5-V to 18-V Wide Input Voltage Range

• Programmable Slew Rate Control for Output

Voltage Transition

• Up to 5-A Maximum Continuous Output Current in

Buck 1 and Buck 2

• Buck 1 and Buck 2 can be Paralleled to Deliver up

to 10-A Current

• Pulse Skipping Mode to Achieve High Efficiency in

Light Load

• Adjustable Switching Frequency

200 kHz to 1.6 MHz Set by External Resistor

• Dedicated Enable and Soft-Start for Each Buck

• Peak Current-Mode Control With Simple

Compensation Circuit

• Cycle-by-Cycle Overcurrent Protection

• 180° Out-of-Phase Operation to Reduce Input

Capacitance and Power Supply Induced Noise

• Over Temperature Protection

• Available in 32-Pin Thermally Enhanced HTSSOP

(DAP) and 36-Pin VQFN 6-mm × 6-mm (RHH)

Packages

2 Applications

• DTV

• Telecom and Network

• Point-of-Load

• Set Top Boxes

• Tablet PC

3 Description

TPS65279 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.

Two bucks in TPS65279 can be paralleled to delivery

up to 10-A load current by using current sharing mode, connect ISHARE pin high. Two phase

operation in current sharing reduces system filtering

capacitance and inductance, alleviates EMI and

improves output voltage ripple and noise.

TPS65279 features a dedicated enable pin. An

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

overcurrent protection and hiccup mode operation

limit MOSFET power dissipation in short circuit or

over loading fault conditions.