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MAX8620Y：µPMIC for Microprocessors or DSPs in Portable Equipment

Step-Down DC-DC Integrates 2 LDOs and Reset in Tiny TDFN to Power Microprocessor in Portables

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.

Key Features 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

MAX8620Y: Typical Operating Circuit Applications/Uses Cellular Handsets Microprocessor and DSP Solutions including MSM™, Intel XScale™, ARM™, and OMAP™ PDAs Smartphones/PDA Phones Wireless Local Area Networks (WLANs)

DataSheet

Parametrics

Design kits & evaluation modules

• MAX8620YEVKIT

Quality and Environmental Data

• MAX8620Y.pdf

Ordering Information