TPS40077 4.5-V to 28-V Input, Voltage Mode, Synchronous Buck Controller With Voltage Feed Forward

1 Features

• 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 short-circuit 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.

1. For all available packages, see the orderable addendum at the end of the data sheet.

Device Images

Simplified Application Diagram