LT1777 is a low noise step-down switching regulator designed by Linear Technology. It features programmable di/dt limit, internally limited dv/dt, high input voltage(48V), 700mA peak switch rating, true current mode control, 100kHz fixed operating frequency, synchronizable to 250kHz, low supply current in shutdown(30µA), low thermal resistance 16-pin SO package.
The LT1777 is a low‑noise step‑down (buck) switching regulator designed for noise‑sensitive applications. It features programmable dl/dt limiting, internally limited dV/dt, a high input voltage capability up to 48 V, and a fixed 100 kHz switching frequency. The device includes a current‑mode control architecture and a 16‑lead SO package with low thermal resistance.
The document provides absolute maximum ratings, electrical characteristics, pin functions, typical performance graphs, and example circuit layouts. It also lists related parts and ordering information for the LT1777 series.
| Maximum Input Voltage | 48 V |
|---|---|
| Peak Switch Current Rating | 700 mA |
| Fixed Switching Frequency | 100 kHz |
| Shutdown Mode Supply Current | 30 µA |
The regulator can operate with an input voltage up to 48 V.
The internal switch is rated for a peak current of 700 mA.
The device uses a fixed switching frequency of 100 kHz.
In shutdown mode the regulator draws about 30 µA.