The uP7558 is a current limited high-side switch designed for applications where heavy capacitive loads and shortcircuits 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 uP7558 asserts over current protection and limits the output current to a safe level by driving the power switch into saturation mode.
The uP7558 features glitch-blank fault flag that is asserted by over current and over temperature. The 8ms glitchblanking 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 uP7558 is available in TSOT23-5L, TSOT23-5L(Flip-Chip), SOT23 – 5L, and MSOP-8L packages.

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