MAX8620Y Datasheet | Maxim Integrated

.. 19-3564; Rev 0; 1/05 KIT ATION EVALU E L B A AVAIL µPMIC for Microprocessors or DSPs in Portable Equipment General Description Features - Three Regulators and a Reset in One Package - High-Efficiency Step-Down Converter Up to 4MHz Fixed Switching Frequency 500m A Guaranteed Output Current 0.6V to 3.3V Adjustable Output Voltage ±2% Initial Accuracy Fast Voltage-Positioning Transient Response Internal Synchronous Rectifier - Two 300m A LDO Regulators 200m V Dropout at 200m A Load Low 45µVRMS Output Noise 3% Accuracy over Line, Load, and Temperature Overcurrent Protection Nine Pin-Selectable Output-Voltage Settings - 30ms (min) 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 The MAX8620Y micro-power-management integrated circuit (µPMIC) powers low-voltage microprocessors or DSPs in portable devices. The µPMIC includes a highefficiency 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 ponents. 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 500m A. The MAX8620Y’s two LDOs offer low 45µVRMS output noise and a low dropout of only 200m V at 200m A. Each LDO delivers at least 300m A of continuous output current. The output voltages are pin selectable from 1.8V to 3.3V for flexibility. A microprocessor reset output (RESET) monitors OUT1 and warns the system of impending power loss allowing...