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MAX629
28V, Low-Power, High-Voltage, Boost or Inverting DC-DC Converter


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Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 144kB)
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The MAX629 low-power DC-DC converter features an internal N-channel MOSFET switch and programmable current limiting. It is designed to supply positive or negative bias voltages up to ±28V from input voltages in the 0.8V to VOUT range, and can be configured for boost, flyback, and SEPIC topologies.

The MAX629's current-limited pulse-frequency-modulation (PFM) control scheme provides high efficiency over a wide range of load conditions. An internal, 0.5A N-channel MOSFET switch reduces the total part count, and a high switching frequency (up to 300kHz) allows for tiny surface-mount magnetics.

The MAX629's combination of low supply current, logic-controlled shutdown, small package, and tiny external components makes it an extremely compact and efficient high-voltage biasing solution that's ideal for battery-powered applications. The MAX629 is available in an 8-pin SO package.

An evaluation kit is available:  MAX629EVKIT  

Key Features   Applications/Uses
  • Internal, 500mA, 28V N-Channel Switch (No External FET Required)
  • Generates Positive or Negative Output Voltages
  • 80µA Supply Current
  • 1µA Max Shutdown Current
  • Up to 300kHz Switching Frequency
  • Adjustable Current Limit Allows Use of Small, Inexpensive Inductors
  • 8-Pin SO Package

 
  • 2-Cell and 3-Cell Battery-Powered Applications
  • High-Efficiency DC-DC Boost Converters
  • Palmtop Computers
  • Positive or Negative LCD Bias Generators
  • Varactor Tuning Diode Bias

    Key Specifications:  Inverting Switching Regulators
    Part Number VIN
    (V)
    VIN
    (V)
    Max. IOUT
    (A)
    Max. IOUT
    (A)
    Output Adjust. Method DC-DC Outputs Alternate Topology Oper. Freq.
    (kHz)
    Package/Pins Smallest Available Pckg.
    (mm2)
    Price
    min max max w/pins See Notes
    MAX629  2.7 5.5 0.5 0.5 Resistor 1
    Inverting
    Step-Up
    300
    SOIC(N)/8
    31 $2.85 @1k
    See All Inverting Switching Regulators (25)

    Key Specifications:  Step-Up Switching Regulators
    Part Number VIN
    (V)
    VIN
    (V)
    Max. IOUT
    (A)
    Max. IOUT
    (A)
    Output Adjust. Method DC-DC Outputs Oper. Freq.
    (kHz)
    Package/Pins Smallest Available Pckg.
    (mm2)
    Price
    min max max w/pins See Notes
    MAX629  2.7 5.5 0.5 0.5 Resistor 1 300
    SOIC(N)/8
    31 $2.85 @1k
    See All Step-Up Switching Regulators (90)

    Diagram
    Typical Operating Circuit



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    Document Ref.: 19-1219; Rev 1; 1997-06-01
    This page last modified: 2007-06-01


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