The MAX1922 is a 1A current-limited switch with built-in fault blanking that provides an accurate, preset 1.4A to 2.1A current limit, making it ideal for dual USB applications. Its low quiescent supply current (16µA) and standby current (1µA) conserve battery power in portable applications. The MAX1922 operates with inputs from 2.7V to 5.5V, making it ideal for both 3V and 5V systems. An overcurrent signal (OC) notifies the microprocessor that the internal current limit has been reached. A 10ms overcurrent-blanking feature allows momentary faults (such as those caused when hot-swapping into a capacitive load) to be ignored, thus preventing false alarms to the host system. This blanking also prevents an OC signal from being issued when the device is powering up. The MAX1922 has several 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 overload. The MAX1922 is offered in a space-saving 8-pin SO package and a 10-pin TDFN package.
The MAX1922 is a p‑channel MOSFET power switch that limits output current to a preset range of 1.4 A – 2.1 A, making it suitable for dual‑USB applications. It operates from 2.7 V to 5.5 V and includes built‑in fault‑blanking, thermal‑overload protection, and undervoltage lockout.
Key features include a 10 ms overcurrent‑blanking timeout, low quiescent supply current (16 µA) and standby current (1 µA), short‑circuit protection, and a maximum operating temperature of +85 °C. The device is offered in 8‑pin SO and 10‑pin TDFN packages and is intended for notebook computers, USB hubs, docking stations, and other portable USB power applications.
| Input Voltage Range | 2.7 V – 5.5 V |
|---|---|
| Switch Turn‑On Time (tON) | 200 µs typ |
| Overcurrent (OC) Threshold | 1.1 A |
| Thermal Shutdown Threshold | 165 °C |
| Operating Temperature Range | -40 °C to +85 °C |
It is offered in an 8‑pin SO package and a 10‑pin TDFN package.