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.