The MAX8620YETD 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.
Feature
- 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
Applications
- Cellular Handsets
- Microprocessor and DSP Solutions including MSM?, Intel XScale?, ARM?, and OMAP?
- PDAs
- Smartphones/PDA Phones
- Wireless Local Area Networks (WLANs)