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The LM20343 is a full featured synchronous buck regulator capable of delivering up to 3A of load current. The current mode control loop is externally compensated with only two components, offering both high performance and ease of use. The device is optimized to work over the input voltage range of 4.5V to 36V making it well suited for high 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. Startup inrush currents are limited by both an internally fixed and externally adjustable soft-start circuit. Fault detection and supply sequencing are possible with the integrated power good (PGOOD) circuit.
The frequency of this device can be adjusted from 250 kHz to 1.0 MHz by connecting an external resistor from the RT pin to ground.
The LM20343 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 LM20343 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 LM20343 is offered in an exposed pad 20-pin HTSSOP package that can be soldered to the PCB, eliminating the need for bulky heatsinks.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM20343 36V, 3A Adjustable Frequency Synchronous Buck Regulator datasheet (Rev. B) | 03 Apr 2013 | |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| EVM User's guide | AN-1792 LM20343 Evaluation Board (Rev. B) | 05 May 2013 | ||
| Application note | AN-2077 LM20k POL Module (Rev. A) | 03 May 2013 |
For additional terms or required resources, click any title below to view the detail page where available.
This evaluation board provides a solution to examine the full featured LM20343 buck switching regulator that is capable of driving up to 3A of load current. The device features a frequency adjust pin that allows the switching frequency to be adjusted from 250 kHz to 1.0 MHz. This board is capable (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HTSSOP (PWP) | 20 | Ultra Librarian |
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