MAX1558/MAX1558H is a dual, current-limited switch with autoreset for USB applications. Autoreset latches the switch off if it is shorted for more than 20ms, saving system power. The shorted output is then tested to determine when the short is removed to automatically restart the channel. Each channel delivers up to 1.2A and meets all IEC specifications for USB ports. Low quiescent supply current (45µA) and standby current (3µA) conserve battery power in portable applications. The MAX1558/MAX1558H safety features ensure that the USB port is protected. Built-in thermal-overload protection limits power dissipation and junction temperature. Accurate, programmable current-limiting circuitry pro- tects the input supply against both overload and short-cir- cuit conditions. 20ms fault blanking enables the circuit to ignore transient faults, such as those caused when hot swapping a capacitive load, preventing false alarms to the host system. The MAX1558/MAX1558H also feature reverse-current protection circuitry to block current flow from the output to the input when the switches are off. The MAX1558/MAX1558H are available in space-sav- ing 3mm x 3mm, 10-pin TDFN packages. The MAX1558 is enabled with an active-low signal, and the MAX1558H is enabled with an active-high signal.
The MAX1558 and MAX1558H are dual, current‑limited USB switches that feature an autoreset function. Each channel can deliver up to 1.2 A, operates from a 2.7 V‑5.5 V supply, and includes thermal‑overload, fault‑blanking, and reverse‑current protection.
The devices are offered in a compact 3 mm × 3 mm 10‑pin TDFN package. They are intended for USB ports and hubs in notebooks, desktops, PDAs, docking stations, and other portable applications where power‑saving and fault protection are required.
| Supply Voltage Range | 2.75 V – 5.5 V |
|---|---|
| Switch On‑Resistance (typical) | 64 mΩ |
| Standby Supply Current (both switches disabled) | 3 µA – 6 µA |
| Quiescent Supply Current (both switches enabled) | 45 µA – 75 µA |
| Continuous Load Current per channel | 1.2 A |
The devices operate from 2.75 V up to 5.5 V supply voltage.
Each channel can supply up to 1.2 A continuously.
Typical on‑resistance is 64 mΩ at a 3.3 V supply.
Yes, reverse current is internally blocked when the switch is disabled.