The LT ®1765 is a monolithic buck switching regulator from Texas Instruments. It integrates a high efficiency 3A, 0.09Ω switch and all the control circuitry required to construct a high frequency, current mode switching regulator. The chip can operate at a wide input voltage range of 3V to 25V and output a maximum current of 3A.
The LT1765 family provides a constant‑frequency, current‑mode buck converter that delivers up to 3 A with a typical switching frequency of 1.25 MHz. It operates over a wide input voltage range (3 V to 25 V) and offers high efficiency, low shutdown current, and synchronizable operation up to 2 MHz. Applications include DSL modems, portable computers, wall adapters, battery‑powered systems, and distributed power.
The device is available in 8‑lead SO and 16‑lead thermally enhanced TSSOP packages. Pin functions include FB (feedback), BOOST (drive voltage), VIN, GND, VSW, SYNC, SHDN, and VE, each with specific roles for voltage regulation, current sensing, and shutdown control. Detailed electrical characteristics, typical performance graphs, and package dimensions are provided for design reference.
| Maximum Switch Current Limit | 4 A (typ) |
|---|---|
| Input Voltage Range | 3 V to 25 V |
The device is offered in an 8‑lead plastic SO package and a 16‑lead thermally enhanced TSSOP package.