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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


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Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 416kB)
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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.

An evaluation kit is available:  MAX8620YEVKIT  

Key Features   Applications/Uses
  • 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
 

Key Specifications:  Multifunction PMICs
Part Number Primary Topology Monitor/Control Features DC-DC/Power Features VIN
(V)
VIN
(V)
VOUT
(V)
VOUT
(V)
Max. IOUT
(A)
Max. IOUT
(A)
Oper. Freq.
(kHz)
Package/Pins Smallest Available Pckg.
(mm2)
Price
min max min max max w/pins See Notes
MAX8620Y  Step-Down
Reset Output
Shutdown
Adj. Frequency
Current Limit
Internal Pwr. FETs
Soft Start
Sync. Rectifier
2.7 5.5 0.6 3.3 0.5 0.5 4000
TDFN-EP/14
9.6 $2.20 @1k
See All Multifunction PMICs (83)

Diagram
MAX8620Y: Typical Operating Circuit
Typical Operating Circuit

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    Document Ref.: 19-3564; Rev 0; 2005-02-08
    This page last modified: 2009-12-09


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