The LT1776 is a wide input range, high efficiency Buck (step-down) switching regulator. It can accept input voltages as high as 60V and contains an output switch rated at 700mA peak current. Current mode control delivers excellent dynamic input supply rejection and short-circuit protection.
The LT1776 is a wide input range, high‑efficiency buck (step‑down) switching regulator designed for automotive DC/DC converters, cellular phone battery chargers, and IEEE 1394 step‑down converters. It features a 7.4 V to 40 V input range, 700 mA peak switch rating, adaptive switch drive, and true current‑mode control for excellent efficiency across load conditions.
The device is supplied in 8‑lead SO‑8 and PDIP packages and includes detailed pin functions, timing diagrams, and typical performance curves. Key specifications such as a 200 kHz fixed switching frequency, 30 pA shutdown current, and operation from –40 °C to 125 °C are provided, along with guidelines for selecting inductors and implementing the regulator in high‑efficiency battery‑charging applications.
| Input Voltage Range | 7.4 V to 40 V |
|---|---|
| Output Switch Peak Current | 700 mA |
| Switching Frequency | 200 kHz (fixed) |
| Shutdown Mode Supply Current | 30 pA |
| Operating Temperature Range | -40 °C to 125 °C |
It operates at a fixed 200 kHz switching frequency (typical range 180‑220 kHz).
The regulator is offered in 8‑lead SO‑8 and 8‑lead PDIP packages.
The shutdown mode current is only 30 pA.