TPS40057PWP

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1. Describe

The TPS40057PWP is a family of high voltage, wide input (8 V to 40 V) synchronous buck controllers. The TPS40057PWP family provides design flexibility through a variety of user-programmable features, including soft-start, UVLO, operating frequency, voltage feedforward, high-side current limit, and loop compensation. The TPS4005x uses a voltage feedforward control technique to provide good line regulation over a wide (4:1) input voltage range and fast response to input line transients. Near-constant modulator gain with input variation simplifies loop compensation. Externally programmable current limit provides pulse-by-pulse current limit, as well as hiccup mode operation using an internal fault counter for longer duration overloads. The new products LM5145 and LM5146 offer lower BOM cost, higher efficiency and smaller solution size, among many other features. Start your WEBENCH® design with the LM5145 and LM5146.

2. Feature

    1. New product launch

        – LM5145 75V synchronous buck controller with wide input voltage and duty cycle range

        – LM5146 100V Synchronous Step-Down DC/DC Controller with Wide Duty Cycle Range

    2. Operating input voltage 8 V to 40 V

    3. Input voltage feedforward compensation

    4. < 1% internal 0.7V reference

    5. Programmable fixed frequency up to 1MHz voltage mode controller

    6. Internal gate drive outputs for high side and synchronous N-channel MOSFETs

    7. 16-Pin PowerPAD™ Package (RθJC = 2°C/W)

    8. Thermal shutdown

    9. External synchronization possible

  10. Programmable high-side detection short-circuit protection

  11. Programmable closed-loop soft-start

  12. TPS40054 source only

  13. TPS40055 source and sink

  14. TPS40057 source and sink with VO pre-bias

3. Application

    1. Power module

    2. Network and Telecom

    3. Industrial and Servers

4. Pin configuration

5. Pin Description

6. Device functional mode

The TPS40057PWP is safe for pre-biased outputs and does not turn on the synchronous rectifier until the high-side FET has started switching. The TPS40054 operates in one quadrant and supplies output current only, allowing paralleling of converters and ensuring that one converter does not sink current from the other. The controller also simulates a non-synchronous buck converter at light loads with discontinuous inductor current. With continuous output inductor current, the controller operates as a synchronous buck converter to optimize efficiency. The TPS40055 operates in two quadrants, sourcing and sinking output current.

7. Application Information

The TPS40057PWP family of synchronous buck controllers is designed to operate over a wide input voltage range (8 V to 40 V). These devices are used to convert higher DC input voltages to lower DC output voltages for a variety of applications. Use the following design procedure to select key component values for this family of devices.