The LTC4365 is a low-dropout, low-voltage-difference, single-channel, high-side switch regulator that uses a high-performance P-channel MOSFET as the power switch and features adjustable output voltage, overvoltage protection, undervoltage protection, and reverse input voltage protection.
The document describes design features of the LTC4365, an integrated circuit designed to protect sensitive circuits from unpredictable high or negative supply voltages. It utilizes a unique architecture that requires only a single external dual N-channel MOSFET to block positive and negative voltages at the input pin.
Key capabilities include accurate overvoltage and undervoltage protection with user-selectable thresholds, novel reverse supply protection without needing blocking diodes, and AC line voltage filtering via a recovery delay timer. The device operates within a wide voltage range of 2.5V to 34V.
| Operating Range | 2.5V to 34V |
|---|---|
| Undervoltage Block Limit | Down to -40V |
| External Component Requirement | Dual N-channel MOSFET |
| Shutdown Current | 10pA |
It employs a novel circuit that connects the GATE pin to the input voltage when sensing a negative voltage, allowing back-to-back external MOSFETs to block without a diode drop.
Yes, with the part in shutdown, the input and output pins can be driven by different supplies; the device drives the gate below the lower supply to prevent current flow.