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1 Features

1? Operation Over 4.5-V to 28-V Input Range

? Programmable, Fixed-Frequency, up to 1-MHz,

Voltage-Mode Controller

? Predictive Gate-Drive Anti-Cross-Conduction

Circuitry

? <1% Internal 700-mV Reference

? Internal Gate-Drive Outputs for High-Side and

Synchronous N-Channel MOSFETs

? 16-Pin PowerPAD? Package

? Thermal Shutdown Protection

? Pre-Bias Compatible

? Power-Stage Shutdown Capability

? Programmable High-Side Sense Short-Circuit

Protection

2 Applications

? Power Modules

? Networking/Telecom

? PCI Express

? Industrial

? Servers

3 Description

The TPS40077 is a mid-voltage, wide-input (4.5-V to

28-V), synchronous, step-down controller, offering

design flexibility for a variety of user-programmable

functions, including soft start, undervoltage lockout

(UVLO), operating frequency, voltage feed-forward,

and high-side, FET-sensed, short-circuit protection.

The TPS40077 drives external N-channel MOSFETs

using second-generation, predictive-gate drive to

minimize conduction in the body diode of the low-side

FET and maximize efficiency. Pre-biased outputs are

supported by not allowing the low-side FET to turn on

until the voltage commanded by the closed-loop soft

start is greater than the pre-bias voltage. Voltage

feed-forward provides good response to input

transients and provides a constant PWM gain over a

wide input-voltage operating range to ease

compensation requirements. Programmable shortcircuit

protection provides fault-current limiting and

hiccup recovery to minimize power dissipation with a

shorted output. The 16-pin PowerPAD package gives

good thermal performance and a compact footprint.