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
MAX8620Y: Typical Operating Circuit
  • Cellular Handsets
  • Microprocessor and DSP Solutions including MSM™, Intel XScale™, ARM™, and OMAP™
  • PDAs
  • Smartphones/PDA Phones
  • Wireless Local Area Networks (WLANs)
titleDownload file
MAX8620Y Data SheetMAX8620Y.pdf
Part NumberPrimary TopologyMonitor/Control FeaturesDC-DC/Power FeaturesVIN
Oper. Freq.
minmaxminmaxSee Notes
MAX8620YStep-DownReset Output
Adj. Frequency
Current Limit
Internal Switch
Soft Start
Sync. Rectifier$2.37 @1k
Design kits & evaluation modules
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX8620YC/DWNo Longer AvailableWAFER;0°C to +70°CSee data sheet
MAX8620YC/WNo Longer AvailableWAFER;0°C to +70°CSee data sheet
MAX8620YETD+ActiveTDFN-EP,;14 pin;9.6 mm²-40°C to +85°CLead Free
MAX8620YETD+TActiveTDFN-EP,;14 pin;9.6 mm²-40°C to +85°CLead Free
MAX8620YETD-TNo Longer AvailableMAX8620YETD+TTDFN-EP,;14 pin;9.6 mm²-40°C to +85°CNo
MAX8620Y.pdf MAX8620Y
MAX8620Y.pdf MAX8620Y
MAX8620Y.pdf MAX8620Y
MAX8620Y.pdf MAX8620Y
典型工作电路 MAX8620Y