The MAX1812 is a dual current-limited switch specifically made for USB applications. Each channel is guaranteed to supply 500mA and meets USB specifications. The MAX1812’s low quiescent supply current (45µA) and shutdown current (3µA) conserve battery power in portable applications. The MAX1812 has multiple safety features to ensure that the USB port is protected. Built-in thermal-overload protection limits power dissipation and junction temperature. The device also has accurate internal current-limiting circuitry to protect the input supply against both overload and short-circuit conditions. Independent fault signals (FAULTA and FAULTB) notify the microprocessor when a thermal-overload, current limit, undervoltage lockout, or short-circuit fault occurs. A 20ms fault-blanking feature enables the circuit to ignore momentary faults, such as those caused when hot-swapping a capacitive load, thereby preventing false alarms to the host system. The MAX1812 is available in a space-saving 10-pin µMAX package. For single versions of this device, refer to the MAX1693, MAX1694, and MAX1607 data sheets.
The MAX1812 is a dual current‑limited USB switch designed for USB applications. Each channel can supply a guaranteed 500 mA, includes built‑in thermal‑overload protection, fault‑blanking, and independent FAULT indicator outputs. The device operates from a 4.0 V to 5.5 V input range and fits in a 10‑pin µMAX package.
The datasheet provides absolute maximum ratings, electrical characteristics, typical operating curves, pin descriptions, and layout recommendations. Key parameters such as on‑resistance, quiescent current, fault‑blanking timeout, and power‑dissipation limits are listed for designers.
| Supply Voltage Range | 4.0 V to 5.5 V |
|---|---|
| Quiescent Supply Current (both switches enabled) | 45 µA |
| FAULT Output Current | 20 mA |
The device operates from 4.0 V to 5.5 V.
The quiescent supply current is 45 µA.