The MAX1693/(MAX1693H)/MAX1694 are current-limited, 60mΩ switches with built-in fault blanking. Their accurate preset current limit of 0.7A to 1.0A makes them ideally suited for USB applications. Their low quiescent supply current (14µA) and shutdown current (1µA) con- serve battery power in portable applications. The MAX1693/(MAX1693H)/MAX1694 operate with inputs from 2.7V to 5.5V, making them ideal for both 3V and 5V systems. A fault signal notifies the microprocessor that the inter- nal current limit has been reached. A 10ms fault-blank- ing 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 fault blanking also prevents a fault signal from being issued when the device is powering up. In the MAX1693/(MAX1693H), an output overcurrent condition causes the switch to current limit at 0.7A to 1.0A and FAULT to go low after the 10ms blanking peri- od. When the overcurrent condition is removed, FAULT returns to its high-impedance state. In the MAX1694, any overcurrent longer than 10ms will latch the switch open and set FAULT low. The latch is cleared by cycling the ON input or by powering up the device again. This feature saves power by preventing the device from ther- mal cycling on and off in case of a persistent short-cir- cuit condition. The MAX1693/(MAX1693H)/MAX1694 have several safety features to ensure that the USB port is protected.
The MAX1693, MAX1693H, and MAX1694 are P‑channel MOSFET power switches designed for USB applications. They provide an accurate preset current limit of 0.7 A to 1.0 A, a 10 ms internal fault‑blanking timer, and built‑in thermal‑shutdown protection. Their low quiescent supply current (14 µA) and shutdown current (1 µA) help conserve battery power in portable devices.
Typical applications include USB ports and hubs, notebook computers, docking stations, and hot‑plug power supplies. The devices operate from 2.7 V to 5.5 V, feature a 125 mΩ on‑resistance, and can dissipate up to 1.2 A (internally limited). Proper layout with short traces and decoupling capacitors is recommended for optimal performance.
| Supply Voltage Range | 2.7 V to 5.5 V |
|---|---|
| Current Limit | 0.7 A min, 1.0 A max |
| Quiescent Supply Current | 14 µA |
| Fault‑Blanking Timeout | 10 ms |
| Maximum Continuous Switch Current | 1.2 A (internally limited) |
The internal fault‑blanking timer is 10 ms.
The quiescent supply current is typically 14 µA.
They operate with input voltages from 2.7 V to 5.5 V.