The LM20323 is a 36V, 3A synchronous buck regulator from TI that operates at a frequency of up to 500kHz. The device uses current mode control and requires only two external components for compensation, providing both high performance and ease of use. LM20323's input voltage range is 4.5V to 36V, making it suitable for high voltage systems. The device features internal overvoltage protection (OVP) and overcurrent protection (OCP) circuits to improve system reliability. A precision enable pin and integrated UVLO allow the device to be tightly controlled and sequenced during startup. 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. LM20323 is designed to perform well in multi-rail power supply architectures. Using the SS/TRK pin, the device's output voltage can be configured to track a higher voltage power rail. If the LM20323 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. LM20323 is offered in an exposed pad 20-pin eTSSOP package that can be directly soldered to the PCB, eliminating the need for bulky heatsinks.
The LM20323 is a full‑featured 500 kHz synchronous buck regulator that delivers up to 3 A of load current. It operates over a wide input range of 4.5 V to 36 V and includes internal over‑voltage, over‑current, and under‑voltage lockout protection, as well as a programmable soft‑start circuit and a power‑good output.
The device is supplied in an exposed‑pad eTSSOP‑20 package and the pinout provides dedicated pins for soft‑start/tracking, feedback, power‑good, enable, and boost. Typical applications include high‑efficiency point‑of‑load regulation for DSPs, FPGAs, ASICs, microprocessors, and communication or automotive systems.
| Input voltage range | 4.5 V to 36 V |
|---|---|
| Output current | 3 A (5.2 A peak) |
| Switching frequency | Fixed 500 kHz |
| Peak efficiency | 93 % (with synchronous rectification) |
| Package | eTSSOP‑20 exposed‑pad |
| Soft‑start / tracking pin | SS/TRK – Soft‑Start or Tracking control input |
The regulator accepts an input voltage from 4.5 V up to 36 V.
It operates at a fixed switching frequency of 500 kHz.
The device includes integrated over‑voltage protection (OVP), over‑current protection (OCP), under‑voltage lockout (UVLO), and a power‑good (PGOOD) output.
It is offered in an exposed‑pad eTSSOP‑20 package.