The LT3437 is a high voltage 500mA, 200kHz step-down switching regulator with 100µA quiescent current. It supports 1.25V feedback voltage, wide input range and low static current
The LT3437 is a constant‑frequency, current‑mode buck converter designed for high‑efficiency power conversion. It operates from 3.3 V to 60 V input and delivers up to 500 mA peak switch current, featuring burst‑mode operation for ultra‑low quiescent current.
The device is offered in a 10‑pin DFN package or a 16‑lead TSSOP, with an exposed pad for thermal grounding. Pin functions, electrical characteristics, and typical performance graphs are provided for design reference.
| Input Voltage Range | 3.3 V to 60 V |
|---|---|
| Switching Frequency | 200 kHz |
| Peak Switch Current | 500 mA |
| Quiescent Current (Burst Mode) | 100 µA |
| Shutdown Current | < 1 pA |
| Maximum Duty Cycle | 95 % |
The minimum input voltage is 2.5 V (typical) and 3 V (minimum) as specified in the electrical characteristics.
Burst‑mode can be defeated by applying a logic‑high signal to the SYNC pin, which disables the low‑load mode.
The SHDN pin requires a voltage above 1.3 V to exit shutdown.
It is available in a 10‑pin DFN package (0.75 mm low profile) and a 16‑lead TSSOP package, both with exposed pad leadframes.