The MAX8620Y micro-power-management integrated circuit (µPMIC) powers low-voltage microprocessors or DSPs in portable devices. The µPMIC includes a high efficiency step-down DC-DC converter, two lowdropout linear regulators (LDOs), a microprocessor reset output, and power-on/off control logic. This device maintains high efficiency at light loads with a low 115µA supply current, and its miniature TDFN package makes it ideal for portable devices. The MAX8620Y's step-down DC-DC converter utilizes a proprietary 4MHz hysteretic-PWM control scheme that allows for ultra-small external components. Internal synchronous rectification improves efficiency and eliminates the external Schottky diode that is required in conventional step-down converters. The output voltage is adjustable from 0.6V to 3.3V, with guaranteed output current up to 500mA. The MAX8620Y's two LDOs offer low 45µVRMS output noise and a low dropout of only 200mV at 200mA. Each LDO delivers at least 300mA of continuous output current. The output voltages are pin selectable from 1.8V to 3.3V for flexibility. A microprocessor reset output (active-low RESET) monitors OUT1 and warns the system of impending power loss allowing safe shutdown. Active-low RESET asserts during power-up, power-down, shutdown, and fault conditions where VOUT1 is below its regulation voltage. Applications * Cellular Handsets * Microprocessor and DSP Solutions including MSM™, Intel XScale™, ARM™, and OMAP™ * PDAs * Smartphones/PDA Phones * Wireless Local Area Networks (WLANs) * Three Regulators and a Reset in One Package * High-Efficiency Step-Down Converter * Up to 4MHz Fixed Switching Frequency * 500mA Guaranteed Output Current * 0.6V to 3.3V Adjustable Output Voltage * ±2% Initial Accuracy * Fast Voltage-Positioning Transient Response * Internal Synchronous Rectifier * Two 300mA LDO Regulators * 200mV Dropout at 200mA Load * Low 45µVRMS Output Noise * 3% Accuracy over Line, Load, and Temperature * Overcurrent Protection * Nine Pin-Selectable Output-Voltage Settings * 30ms (min) Active-Low RESET Output Flag * 2.7V to 5.5V Input * 115µA (typ) Supply Current at No Load * Thermal-Overload Protection * Tiny 3mm x 3mm x 0.8mm TDFN Package