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Data sheet
LM5045
- 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.
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 | 14 May 2026 |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| User guide | AN-2111 LM5045 Evaluation Board (Rev. C) | 06 May 2013 | ||
| Application note | AN-2213 LM5045 Based 240W Power Converter Using Full-Wave (Rev. A) | 06 May 2013 | ||
| Application note | Applying I2C-Compatible Temperature Sensors in Systems With Slow Clock Edges (Rev. A) | 06 May 2013 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
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.
Reference designs
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 (...)
Test report:
PDF
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HTSSOP (PWP) | 28 | Ultra Librarian |
| WQFN (RSG) | 28 | Ultra Librarian |
Ordering & quality
Information included:
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