The uP7558T/U is a current limited high-side switch designed for applications where heavy capacitive loads and short-circuits are likely to be met. This device operates with inputs from 2.7V to 5.5V for both 3V and 5V systems. Its low quiescent current and shutdown current(<1uA) conserve battery power in portable. The power switch is controlled by a logic enable input and driven by an internal charge pump circuit. When the output load exceeds the current-limit threshold or a short is present, the uP7558T/U asserts over current protection and limits the output current to a safe level by driving the power switch into saturation mode. The uP7558T/U features glitch-blank fault flag that is asserted by over current and over temperature. The 8ms glitch-blanking time allows momentary faults to be ignored, thus preventing false alarms to the host system.

Other features include soft-start to limit inrush current during plug-in, thermal shutdown to prevent catastrophic switch failure from high-current loads, under-voltage lockout (UVLO) to ensure that the device remains off unless there is a valid input voltage present, and output reverse voltage to turn off the power switch when the output voltage is higher than input voltage. The uP7558T/U is available in SOT23-5L package.

• Notebook and Desktop PCs
• USB Power Management
• ACPI Power Distribution
• Hot-Plug Power Supplies
• Battery-Powered Equipments
• Battery-Charger Circuits