The LT ®3431 is a 500kHz monolithic buck switching regu- lator that accepts input voltages up to 60V. A high efficiency 3A, 0.1Ω switch is included on the die along with all the nec- essary oscillator, control and logic circuitry.
The LT3431 is a monolithic buck switching regulator that operates from 5.5 V to 60 V input and delivers up to 3 A of output current. It features a constant 500 kHz switching frequency, a 1.2 V feedback reference, and a shutdown current as low as 30 pA, making it suitable for high‑efficiency power‑supply designs.
The device is supplied in a 16‑lead plastic TSSOP package with an exposed pad for optimal thermal performance. Detailed pin functions, electrical characteristics, and typical performance graphs are provided to aid designers in implementing the regulator in industrial, automotive, and portable applications.
| Input voltage range | 5.5 V to 60 V |
|---|---|
| Peak switch current | 3 A |
| Switching frequency | 500 kHz (constant) |
| Supply current (typical) | 2.5 mA |
| Shutdown current | 30 pA |
| Feedback reference voltage | 1.2 V |
| Package | 16‑lead plastic TSSOP (4.4 mm) with exposed pad |
The LT3431 operates from 5.5 V up to 60 V input.
It uses a constant 500 kHz switching frequency.
The shutdown current is specified as 30 pA.
The device is offered in a 16‑lead plastic TSSOP package with an exposed pad.