The MAX869L is a P-channel load switch with accurate user-set current limit and low on-resistance. It is designed to protect the power source from shorts and surges by limiting current and preventing the system supply from being pulled low. The input voltage range is 2.7V to 5.5V. The MAX869L features a 2A, 45mΩ switch controlled by a logic signal. The current limit can be set from 400mA to 2.4A with ±21% accuracy using a single resistor. The device has a low quiescent supply current of 12µA, which reduces to a maximum of 2µA in shutdown. It also includes thermal shutdown protection and a logic signal output pin (FAULT) for indicating overcurrent or overtemperature conditions. For other devices in this family, please refer to the Selector Guide.
The MAX869L is a high‑side P‑channel load switch that provides precise, user‑set current limiting and low on‑resistance. It operates from 2.7 V to 5.5 V, supports up to 2 A continuous current, and includes thermal‑shutdown and a fault‑indicator output.
Typical applications include USB power management, notebook computers, handheld instruments, and portable medical devices. The datasheet lists pin functions, absolute maximum ratings, electrical characteristics, and layout recommendations for optimal performance.
| Input voltage range | 2.7 V to 5.5 V |
|---|---|
| On‑resistance (RON) | 45 mΩ at 3 V |
| Continuous switch current | 2 A |
| Quiescent supply current | 12 µA typ |
| Shutdown current | 0.01 µA typ |
| Operating temperature range | -40 °C to +85 °C |
| Leakage to output when off | 0.04 µA typ |
The device operates from 2.7 V up to 5.5 V.
By connecting a resistor RSET from the SET pin to ground; the current limit is set using ISET = ILIMIT/955 and RSET = 1.24 V / ISET.
The typical on‑resistance is 45 mΩ at a 3 V input.