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LM5045

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Data sheet

LM5045

ACTIVE
Data sheet Order now

Product details

Topology Full bridge Control mode Current, Voltage Features Current limiting, Hiccup mode protection, High-voltage startup, Integrated gate drivers, Internal reference, Overtemperature protection, Overvoltage protection, Pre-bias startup, Programmable switching frequency, Secondary-side regulated, Synchronizable, Synchronous rectification Duty cycle (max) (%) 50 Sector Robotics, Test & measurement
Topology Full bridge Control mode Current, Voltage Features Current limiting, Hiccup mode protection, High-voltage startup, Integrated gate drivers, Internal reference, Overtemperature protection, Overvoltage protection, Pre-bias startup, Programmable switching frequency, Secondary-side regulated, Synchronizable, Synchronous rectification Duty cycle (max) (%) 50 Sector Robotics, Test & measurement
HTSSOP (PWP) 28 62.08 mm² (9.7 mm × 6.4 mm) WQFN (RSG) 28 25 mm² (5 mm × 5 mm)
  • Highest Integration Controller for Small Form Factor, High-Density Power Converters
  • High-Voltage Start-Up Regulator
  • Intelligent Sync Rectifier Start-Up Allows Linear Turnon Into Prebiased Loads
  • Synchronous Rectifiers Disabled in UVLO mode and Hiccup Mode
  • Two Independent, Programmable Synchronous Rectifier Dead-Time Adjustments
  • Four High-Current 2A Bridge Gate Drivers
  • Wide-Bandwidth Optocoupler Interface
  • Configurable for Either Current Mode or Voltage Mode Control
  • Dual-Mode Overcurrent Protection
  • Resistor Programmed 2MHz Oscillator
  • Programmable Line UVLO and OVP
  • Highest Integration Controller for Small Form Factor, High-Density Power Converters
  • High-Voltage Start-Up Regulator
  • Intelligent Sync Rectifier Start-Up Allows Linear Turnon Into Prebiased Loads
  • Synchronous Rectifiers Disabled in UVLO mode and Hiccup Mode
  • Two Independent, Programmable Synchronous Rectifier Dead-Time Adjustments
  • Four High-Current 2A Bridge Gate Drivers
  • Wide-Bandwidth Optocoupler Interface
  • Configurable for Either Current Mode or Voltage Mode Control
  • Dual-Mode Overcurrent Protection
  • Resistor Programmed 2MHz Oscillator
  • Programmable Line UVLO and OVP

The LM5045 PWM controller contains all of the features necessary to implement full-bridge topology power converters using either current mode or voltage mode control. This device is intended to operate on the primary side of an isolated DC-DC converter with input voltage up to 100V. This highly integrated controller-driver provides dual 2A high-side and low-side gate drivers for the four external bridge MOSFETs plus control signals for the secondary-side synchronous rectifier MOSFETs. External resistors program the leading and trailing edge dead-time between the main and synchronous rectifier control signals. Intelligent start-up of the synchronous rectifiers allows monotonic turnon of the power converter even with prebias load conditions. Additional features include cycle-by-cycle current limiting, hiccup mode restart, programmable soft-start, synchronous rectifier soft-start, and a 2MHz capable oscillator with synchronization capability and thermal shutdown.

The LM5045 PWM controller contains all of the features necessary to implement full-bridge topology power converters using either current mode or voltage mode control. This device is intended to operate on the primary side of an isolated DC-DC converter with input voltage up to 100V. This highly integrated controller-driver provides dual 2A high-side and low-side gate drivers for the four external bridge MOSFETs plus control signals for the secondary-side synchronous rectifier MOSFETs. External resistors program the leading and trailing edge dead-time between the main and synchronous rectifier control signals. Intelligent start-up of the synchronous rectifiers allows monotonic turnon of the power converter even with prebias load conditions. Additional features include cycle-by-cycle current limiting, hiccup mode restart, programmable soft-start, synchronous rectifier soft-start, and a 2MHz capable oscillator with synchronization capability and thermal shutdown.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet LM5045 Full-Bridge PWM Controller With Integrated MOSFET Drivers datasheet (Rev. I) PDF | HTML May 14, 2026
Selection guide Power Management Guide 2018 (Rev. R) Jun 25, 2018
User guide AN-2111 LM5045 Evaluation Board (Rev. C) May 6, 2013
Application note Applying I2C-Compatible Temperature Sensors in Systems With Slow Clock Edges (Rev. A) May 6, 2013
Application note AN-2213 LM5045 Based 240W Power Converter Using Full-Wave (Rev. A) May 6, 2013

Design & development

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Evaluation board

LM5045EVAL — Evaluation Board for the LM5045

The LM5045 evaluation board is designed to provide the design engineer with a fully functional power converter based on the full-bridge topology to evaluate the LM5045 PWM controller. The evaluation board is provided in an industry standard quarter brick footprint.
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Simulation model

LM5045 PSPICE Model

SNVM006.ZIP (350 KB) - PSpice model
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Calculation tool

SLUC501 — LM5045 Design Calculator

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Reference design

PMP31092 — Low-profile 140-W full-bridge reference design

This power supply is a 140-W full-bridge reference design for applications requiring high density and low component heights due to the planar transformer. The design is based on a hard-switched full bridge topology using Schottky diodes on the secondary side and driven by LM5045. A planar (...)
Supported products & hardware
Package Pins CAD symbols, footprints & 3D models
HTSSOP (PWP) 28 Ultra Librarian
WQFN (RSG) 28 Ultra Librarian
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