TPS40055MPWPREP

FEATURES

• Operating Input Voltage 8 V to 40 V 

• Input Voltage Feed-Forward Compensation

• < 1 % Internal 0.7-V Reference

• Programmable Fixed-Frequency Up to 1-MHz Voltage Mode Controller

• Internal Gate Drive Outputs for High-Side and Synchronous N-Channel MOSFETs

• 16-Pin PowerPAD™ Package (θJC = 25°C/W)

• Thermal Shutdown

• Externally Synchronizable

• Programmable High-Side Sense Short-Circuit Protection

• Programmable Closed-Loop Soft-Start

• TPS40055 Source/Sink SUPPORTS DEFENSE, AEROSPACE, AND MEDICAL APPLICATIONS

• Controlled Baseline

• One Assembly/Test Site

• One Fabrication Site

• Available in Military (–55°C/125°C) Temperature Range(1)

• Extended Product Life Cycle

• Extended Product-Change Notification

• Product Traceability

(1) Additional temperature ranges available - contact factory

APPLICATIONS

• Power Modules

• Networking/Telecom

• Industrial/Servers

DESCRIPTION

The TPS40055 is a family of high-voltage, wide input (8 V to 40 V), synchronous, step-down converters.

The TPS40055 family offers design flexibility with a variety of user programmable functions, including

soft-start, UVLO, operating frequency, voltage feedforward, high-side current limit, and loop compensation.

The TPS40055 are also synchronizable to an external supply. The TPS40055 incorporates MOSFET gate drivers for external N-channel high-side and synchronous rectifier (SR) MOSFETs. Gate drive logic incorporates anti-cross conduction circuitry to prevent simultaneous high-side and synchronous rectifier conduction.

The TPS40055 uses voltage feed-forward control techniques to provide good line regulation over the wide (4:1) input voltage range and fast response to input line transients with near constant gain with input variation which eases loop compensation. The externally programmable current limit provides pulseby-pulse current limit, as well as a hiccup mode operation utilizing an internal fault counter for longer duration overloads.

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