This document describes the features and characteristics of the LTC3809 3809fb product, including no current sense resistor required, selectable spread spectrum frequency modulation, constant frequency current mode operation, etc.
The LTC3809 is a synchronous step‑down switching regulator controller that operates without a current‑sense resistor and offers low EMI, spread‑spectrum modulation, and selectable burst‑mode operation. It supports an input voltage range of –0.3 V to 10 V and a switching frequency from 250 kHz to 750 kHz.
The document includes absolute maximum ratings, detailed electrical characteristics, pin descriptions, functional diagrams, operation modes, package dimensions, and typical application circuits. It also lists recommended part numbers for related devices and provides mechanical drawing information for the DFN and MSOP packages.
| Input Supply Voltage | -0.3 V to 10 V |
|---|---|
| Switching Frequency Range | 250 kHz to 750 kHz |
| SW Voltage Rating | -2 V to Viy + 1 V (10 V Max) |
The LTC3809 can be programmed to operate from 250 kHz up to 750 kHz.
The device has ten pins, numbered Pin 1 through Pin 10.
The maximum input voltage is 10 V.