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The LM20145 is a full featured adjustable frequency synchronous buck regulator capable of delivering up to 5A of continuous output current. The current mode control loop can be compensated to be stable with virtually any type of output capacitor. For most cases, compensating the device only requires two external components, providing maximum flexibility and ease of use. The device is optimized to work over the input voltage range of 2.95V to 5.5V making it suited for a wide variety of low voltage systems.
The device features internal over voltage protection (OVP) and over current protection (OCP) circuits for increased system reliability. A precision enable pin and integrated UVLO allows the turn-on of the device to be tightly controlled and sequenced. Start-up inrush currents are limited by both an internally fixed and externally adjustable Soft-Start circuit. Fault detection and supply sequencing is possible with the integrated power good circuit.
The LM20145 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin. If the output of the LM20145 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin.
The frequency of this device can be adjusted from 250 kHz to 750 kHz by connecting an external resistor from the RT pin to ground.
The LM20145 is offered in a 16-pin HTSSOP package with an exposed pad that can be soldered to the PCB, eliminating the need for bulky heatsinks.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | PowerWise Adj Freq Sync Buck Reg datasheet (Rev. E) | 27 Mar 2013 | |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| EVM User's guide | AN-1693 LM20145 Evaluation Board (Rev. B) | 05 May 2013 | ||
| Application note | AN-1752 5A LM20k Reference Designs (Rev. C) | 03 May 2013 | ||
| Application note | AN-2077 LM20k POL Module (Rev. A) | 03 May 2013 | ||
| User guide | LM20145 Demonstration Board User Guide | 27 Jan 2012 |
For additional terms or required resources, click any title below to view the detail page where available.
The LM20145 is a full featured buck switching regulator capable of driving up to 5A of load current. The switching frequency of the LM20145 can be varied from 250kHz to 750kHz with an external resistor allowing the size of the power stage components to be reduced while still providing efficient (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HTSSOP (PWP) | 16 | Ultra Librarian |
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