The LT®1977 is a high voltage 1.5A, 500kHz step-down switching regulator that accepts input voltages up to 60V. It features a high efficiency 1.5A, 0.2Ω switch, current mode topology, and innovative design techniques to achieve high efficiency over a wide input range.
The LT1977 is a high‑voltage, 500 kHz buck switching regulator that accepts input voltages from 3.3 V to 60 V and delivers up to 1.5 A peak switch current. It features a low quiescent current of 100 µA in Burst Mode, a programmable Power‑Good flag, and a soft‑start capability.
Typical applications include automotive 14 V and 42 V systems, industrial power supplies, distributed power, and battery‑powered equipment. The device is supplied in a 16‑lead thermally enhanced TSSOP package with an exposed pad for heat sinking.
| Input Voltage Range | 3.3 V to 60 V |
|---|---|
| Peak Switch Current | 1.5 A |
| Switching Frequency | 500 kHz |
| Quiescent Current (Burst Mode) | 100 µA |
| Feedback Reference Voltage | 1.25 V |
| Switch On‑Resistance | 0.20 Ω |
| Package | 16‑lead Plastic TSSOP |
| Power‑Good Flag | Programmable threshold |
| Shutdown Current | < 1 µA |
The LT1977 can operate with an input voltage up to 60 V.
In Burst Mode the quiescent current can be as low as 100 µA.
It is offered in a 16‑lead plastic TSSOP package with an exposed pad for heat sinking.
Yes, it includes a Power‑Good flag with a programmable threshold.