The MAX1823 is a dual, current-limited switch with autoreset specifically made for USB applications. The autoreset feature latches the switch off if the output is shorted, saving system power. The switch reactivates when the short circuit is removed. Each channel is guar- anteed to supply 720mA and meet USB specifications. Low quiescent supply current (50µA) and standby current (3µA) conserve battery power in portable applications. The MAX1823 has multiple safety features to ensure that the USB port is protected. Built-in thermal-overload protection limits power dissipation and junction temper- ature. Accurate internal current-limiting circuitry pro- tects the input supply against both overload and short-circuit conditions. Independent fault signals (FAULTA and FAULTB) notify the microprocessor (µP) when a thermal-overload, current-limit, undervoltage- lockout (UVLO), or short-circuit fault occurs. A 20ms fault-blanking feature ignores momentary faults, such as those caused when hot swapping a capacitive load, preventing false alarms to the host system. The MAX1823A/MAX1823B also block reverse current (cur- rent from OUT_ to IN_) while in shutdown. The MAX1823 is available in a space-saving 10-pin µMAX package. The MAX1823/MAX1823A are enabled with an active-low signal, and the MAX1823B/MAX1823H are enabled with an active-high signal. For a single ver- sion of this device, refer to the MAX1946 data sheet. For a triple version, refer to the MAX1940 data sheet.
The MAX1823 family provides a dual, current‑limited USB switch that automatically latches off on a short‑circuit and restores power when the fault clears. Each channel supplies up to 720 mA, features built‑in thermal‑overload protection, a 20 ms fault‑blanking interval, and independent FAULT_ indicator outputs.
The device operates from a 4.0 V to 5.5 V supply, consumes only 50 µA quiescent current (both channels on) and 100 µA in standby, and is packaged in a space‑saving 10‑pin µMAX footprint. Variants MAX1823A/B block reverse current when disabled, and the part is rated for –40 °C to +85 °C operation.
| Supply Voltage Range | 4.0 V to 5.5 V |
|---|---|
| Continuous Load Current | 720 mA per channel |
| Quiescent Supply Current (both channels on) | 50 µA |
| Operating Temperature Range | -40 °C to +85 °C |
Each channel can supply a guaranteed 720 mA continuous load current.
The device includes a built‑in 20 ms fault‑blanking interval to ignore momentary faults.
It operates from 4.0 V to 5.5 V supply voltage.