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FEATURES

· Operation Over 4.5-V to 28-V Input Range

· Fixed-Frequency Voltage-Mode Controller

· Integrated Unity Gain Amplifier for Remote

Output Sensing

· Predictive Gate Drive? Generation II for

Improved Efficiency

· <1% Internal 700-mV Reference

· Input Voltage Feed Forward Control

· Prebiased Output Compatible

· Internal Gate Drive Outputs for High-Side and

Synchronous N-Channel MOSFETs

· Switching Frequency Programmable to 1 MHz

· 20-Pin QFN Package

· Thermal Shutdown Protection

· Software Design Tool and EVM Available

APPLICATIONS

· Power Modules

· Networking/Telecom

· Industrial

· Servers

DESCRIPTION

The TPS40074 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, UVLO, operating

frequency, voltage feed-forward and high-side FET

sensed short circuit protection.

The TPS40074 incorporates MOSFET gate drivers

for external N-channel high side and synchronous

rectifier (SR) MOSFETs. The gate drive logic

incorporates second generation predictive anti-cross

conduction circuitry to prevent simultaneous high

side and synchronous rectifier conduction, while

minimizing to eliminating current flow in the body

diode of the SR FET. The TPS40074 allows for

starting into pre-biased outputs by not allowing the

synchronous rectifier FET to turn on until the

commanded voltage during soft start is greater than

the existing pre-bias voltage.

The TPS40074 uses voltage feed-forward control

techniques to provide good line regulation over a

wide input voltage range, and fast response to input

line transients. Voltage feed-forward also provides

nearly constant power stage gain with input variation

to ease loop compensation of wide input range

designs. The externally programmable short circuit

protection provides fault current limiting, as well as hiccup mode operation for low power dissipation in

the presence of a shorted output. The TPS40074 is

packaged in a 20-pin QFN package for better

thermal performance at higher voltages and

frequencies, as well as reduced footprint.