Regulated 5V USB Charge Pump with Programmable Current Limit

The MAX5008 charge-pump regulator generates a regulated 5V output up to 125mA with a 2.95V to 5.5V input voltage range. The device includes resistor-programmable overcurrent limit. The MAX5008 requires a minimum number of external components for normal operation. The high 1MHz switching frequency allows the use of small surface-mount ceramic capacitors.

The fault-protection circuitry limits the output current when it exceeds the limit set by an external resistor. The output current can range from 1mA to 150mA to accommodate circuit requirements. A FAULT-bar output indicates when the device is in current limit or the output is out of regulation.

A low-power shutdown mode reduces supply current to less than 1µA and places the output in a high-impedance state. The MAX5008 is offered in a space-saving 10-pin µMAX® package that is only 1.1mm high.

Applications

* 3.3V to 5V Local Conversion Applications * Battery-Powered Applications * Flash Memory Supplies * USB Host Devices

* Regulated 5V Output Up to 125mA

* Indefinite Short-Circuit Protection

* Adjustable Output Current Limit

* No Inductors Required

* 0.1µA Shutdown Current

* Thermal Shutdown

* Fault Output Indicates Overcurrent or Output Voltage Out of Regulation

* 2.95V to 5.5V Input Voltage Range

* 10-Pin µMAX Package