LT1976/LT1976B are 200kHz monolithic step-down switching regulators that accept input voltages up to 60V. It includes a high efficiency 1.5A, 0.2Ω switch, as well as all necessary oscillator, control and logic circuitry. It uses current mode topology for fast transient response and good loop stability. Innovative design techniques and a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by employing Burst Mode operation at low currents, utilizing the output to bias the internal circuitry, and by using a supply boost.
The LT1976 and LT1976B are monolithic step‑down switching regulators offering a wide input range of 3.3 V to 60 V and up to 1.5 A peak switch current. They feature ultra‑low quiescent current (100 µA for LT1976, 1.6 mA for LT1976B) and include a power‑good flag, soft‑start, and burst‑mode operation for high efficiency across a broad load range.
The device is supplied in a 16‑lead TSSOP package with an exposed pad for optimal thermal performance. Detailed pin functions, absolute maximum ratings, electrical characteristics, and typical application circuits are provided to aid designers in implementing the regulator in automotive, industrial, and battery‑powered systems.
| Input Voltage Range | 3.3 V to 60 V |
|---|---|
| Peak Switch Current (LT1976) | 1.5 A |
| Quiescent Current (LT1976) | 100 µA |
| Switching Frequency | 200 kHz |
| Package | 16‑lead Plastic TSSOP (4.4 mm) |
The regulator operates from 3.3 V up to 60 V input.
The LT1976 has a typical quiescent current of 100 µA.
The BOOST pin provides a drive voltage higher than the input voltage to the internal power switch, improving switch saturation.