MAX639

5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters

Low Supply Current, High-Efficiency Over Wide Load Range


Please check latest availability status for a specific part variant.

Description

The MAX639/MAX640/MAX653 step-down switching regulators provide high efficiency over a wide range of load currents, delivering up to 225mA. A current-limiting pulse-frequency-modulated (PFM) control scheme gives the devices the benefits of pulse-width-modulated (PWM) converters (high efficiency at heavy loads), while using only 10µA of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over a wide range of loads.

The MAX639/MAX640/MAX653 input range is 4V to 11.5V, and the devices provide lower preset output voltages of 5V, 3.3V, and 3V, respectively. Or, the output can be user-adjusted to any voltage from 1.3V to the input voltage.

The MAX639/MAX640/MAX653 have an internal 1A power MOSFET switch, making them ideal for minimum-component, low- and medium-power applications. For increased output drive capability, use the MAX649/MAX651/MAX652 step-down controllers, which drive an external P-channel FET to deliver up to 5W.
MAX639, MAX640, MAX653: Typical Operating Circuit MAX639, MAX640, MAX653: Typical Operating Circuit Enlarge+

Key Features

  • High Efficiency for a Wide Range of Load Currents
  • 10µA Quiescent Current
  • Output Currents Up to 225mA
  • Preset or Adjustable Output Voltage:
    • 5.0V (MAX639)
    • 3.3V (MAX640)
    • 3.0V (MAX653)
  • Low-Battery Detection Comparator
  • Current-Limiting PFM Control Scheme

Applications/Uses

  • 5V to 3.3V Conversion
  • 9V Battery to 5V, 3.3V, or 3V Conversion
  • High-Efficiency Linear Regulator Replacement
  • Portable Instruments and Handy-Terminals
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypePower Good SignalDC-DC OutputsPackage/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX639 411.51.311.5
3
3.3
5
Preset
Resistor
0.225InternalYes1
PDIP/8
SOIC (N)/8
$3.38 @1k
MAX640 3.3
PDIP/8
SOIC (N)/8
$3.38 @1k
MAX653 3
CDIP/8
PDIP/8
SOIC (N)/8
$1.55 @1k
See All Step-Down Switching Regulators (367)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

App Note 414 Solar Cells and Switching Regular Charge Batteries at Optimum Rates

Quality and Environmental Data

Request Reliability Report for: MAX639 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

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  • MAX6390XS30D7+T
  • MAX6390XS31D1+T
  • MAX6390XS31D1-T
  • MAX6390XS31D2+T
  • MAX6390XS31D2-T
  • MAX6390XS31D3+T
  • MAX6390XS31D3-T
  • MAX6390XS31D4+
  • MAX6390XS31D4+T
  • MAX6390XS31D4-T
  • MAX6390XS31D5+T
  • MAX6390XS31D5-T
  • MAX6390XS31D6+T
  • MAX6390XS31D6-T
  • MAX6390XS31D7+
  • MAX6390XS31D7+T
  • MAX6390XS32D1+T
  • MAX6390XS32D1-T
  • MAX6390XS32D2+T
  • MAX6390XS32D3+T
  • MAX6390XS32D3-T
  • MAX6390XS32D4+T
  • MAX6390XS32D4-T
  • MAX6390XS32D5+T
  • MAX6390XS32D5-T
  • MAX6390XS32D6+T
  • MAX6390XS32D6-T
  • MAX6390XS33D1+T
  • MAX6390XS33D1-T
  • MAX6390XS33D2+T
  • MAX6390XS33D2-T
  • MAX6390XS33D3+T
  • MAX6390XS33D3-T
  • MAX6390XS33D4+T
  • MAX6390XS33D4-T
  • MAX6390XS33D5+T
  • MAX6390XS33D5-T
  • MAX6390XS33D6+T
  • MAX6390XS33D6-T
  • MAX6390XS34D1+T
  • MAX6390XS34D1-T
  • MAX6390XS34D2+T
  • MAX6390XS34D2-T
  • MAX6390XS34D3+T
  • MAX6390XS34D3-T
  • MAX6390XS34D4+T
  • MAX6390XS34D4-T
  • MAX6390XS34D5+T
  • MAX6390XS34D5-T
  • MAX6390XS34D6+T
  • MAX6390XS34D6-T
  • MAX6390XS35D1+T
  • MAX6390XS35D1-T
  • MAX6390XS35D2+T
  • MAX6390XS35D2-T
  • MAX6390XS35D3+T
  • MAX6390XS35D3-T
  • MAX6390XS35D4+T
  • MAX6390XS35D4-T
  • MAX6390XS35D5+T
  • MAX6390XS35D5-T
  • MAX6390XS35D6+T
  • MAX6390XS35D6-T
  • MAX6390XS36D1+T
  • MAX6390XS36D1-T
  • MAX6390XS36D2+T
  • MAX6390XS36D2-T
  • MAX6390XS36D3+T
  • MAX6390XS36D3-T
  • MAX6390XS36D4+T
  • MAX6390XS36D4-T
  • MAX6390XS36D5+T
  • MAX6390XS36D5-T
  • MAX6390XS36D6+T
  • MAX6390XS36D6-T
  • MAX6390XS37D1+T
  • MAX6390XS37D1-T
  • MAX6390XS37D2+T
  • MAX6390XS37D2-T
  • MAX6390XS37D3+T
  • MAX6390XS37D3-T
  • MAX6390XS37D4+T
  • MAX6390XS37D4-T
  • MAX6390XS37D5+T
  • MAX6390XS37D5-T
  • MAX6390XS37D6+T
  • MAX6390XS37D6-T
  • MAX6390XS38D1+T
  • MAX6390XS38D1-T
  • MAX6390XS38D2+T
  • MAX6390XS38D2-T
  • MAX6390XS38D3+T
  • MAX6390XS38D3-T
  • MAX6390XS38D4+T
  • MAX6390XS38D4-T
  • MAX6390XS38D5+T
  • MAX6390XS38D5-T
  • MAX6390XS38D6+T
  • MAX6390XS38D6-T
  • MAX6390XS39D1+T
  • MAX6390XS39D1-T
  • MAX6390XS39D2+T
  • MAX6390XS39D2-T
  • MAX6390XS39D3+T
  • MAX6390XS39D3-T
  • MAX6390XS39D4+T
  • MAX6390XS39D4-T
  • MAX6390XS39D5+T
  • MAX6390XS39D5-T
  • MAX6390XS39D6+T
  • MAX6390XS39D6-T
  • MAX6390XS40D1+T
  • MAX6390XS40D1-T
  • MAX6390XS40D2+T
  • MAX6390XS40D2-T
  • MAX6390XS40D3+T
  • MAX6390XS40D3-T
  • MAX6390XS40D4+T
  • MAX6390XS40D4-T
  • MAX6390XS40D5+T
  • MAX6390XS40D5-T
  • MAX6390XS40D6+T
  • MAX6390XS40D6-T
  • MAX6390XS41D1+T
  • MAX6390XS41D1-T
  • MAX6390XS41D2+T
  • MAX6390XS41D2-T
  • MAX6390XS41D3+T
  • MAX6390XS41D3-T
  • MAX6390XS41D4+T
  • MAX6390XS41D4-T
  • MAX6390XS41D5+T
  • MAX6390XS41D5-T
  • MAX6390XS41D6+T
  • MAX6390XS41D6-T
  • MAX6390XS42D1+T
  • MAX6390XS42D1-T
  • MAX6390XS42D2+T
  • MAX6390XS42D2-T
  • MAX6390XS42D3+T
  • MAX6390XS42D3-T
  • MAX6390XS42D4+T
  • MAX6390XS42D4-T
  • MAX6390XS42D5+T
  • MAX6390XS42D5-T
  • MAX6390XS42D6+T
  • MAX6390XS42D6-T
  • MAX6390XS43D1+T
  • MAX6390XS43D1-T
  • MAX6390XS43D2+T
  • MAX6390XS43D2-T
  • MAX6390XS43D3+T
  • MAX6390XS43D3-T
  • MAX6390XS43D4+T
  • MAX6390XS43D4-T
  • MAX6390XS43D5+T
  • MAX6390XS43D5-T
  • MAX6390XS43D6+T
  • MAX6390XS43D6-T
  • MAX6390XS44D1+T
  • MAX6390XS44D1-T
  • MAX6390XS44D2+T
  • MAX6390XS44D2-T
  • MAX6390XS44D3+T
  • MAX6390XS44D3-T
  • MAX6390XS44D4+
  • MAX6390XS44D4+T
  • MAX6390XS44D4-T
  • MAX6390XS44D5+T
  • MAX6390XS44D5-T
  • MAX6390XS44D6+T
  • MAX6390XS44D6-T
  • MAX6390XS45D1+T
  • MAX6390XS45D1-T
  • MAX6390XS45D2+T
  • MAX6390XS45D2-T
  • MAX6390XS45D3+T
  • MAX6390XS45D3-T
  • MAX6390XS45D4+T
  • MAX6390XS45D4-T
  • MAX6390XS45D5+T
  • MAX6390XS45D5-T
  • MAX6390XS45D6+T
  • MAX6390XS45D6-T
  • MAX6390XS46D1+T
  • MAX6390XS46D1-T
  • MAX6390XS46D2+T
  • MAX6390XS46D2-T
  • MAX6390XS46D3+T
  • MAX6390XS46D3-T
  • MAX6390XS46D4+
  • MAX6390XS46D4+T
  • MAX6390XS46D4-T
  • MAX6390XS46D5+T
  • MAX6390XS46D5-T
  • MAX6390XS46D6+T
  • MAX6390XS46D6-T
  • MAX6391KA16+
  • MAX6391KA16+T
  • MAX6391KA16-T
  • MAX6391KA17+T
  • MAX6391KA17-T
  • MAX6391KA22+T
  • MAX6391KA22-T
  • MAX6391KA23+T
  • MAX6391KA23-T
  • MAX6391KA26+
  • MAX6391KA26+T
  • MAX6391KA26-T
  • MAX6391KA29+
  • MAX6391KA29+T
  • MAX6391KA29-T
  • MAX6391KA31+
  • MAX6391KA31+T
  • MAX6391KA31-T
  • MAX6391KA44+T
  • MAX6391KA44-T
  • MAX6391KA46+
  • MAX6391KA46+T
  • MAX6391KA46-T
  • MAX6392KA16+
  • MAX6392KA16+T
  • MAX6392KA16-T
  • MAX6392KA17+
  • MAX6392KA17+T
  • MAX6392KA17-T
  • MAX6392KA22+
  • MAX6392KA22+T
  • MAX6392KA22-T
  • MAX6392KA23+
  • MAX6392KA23+T
  • MAX6392KA23-T
  • MAX6392KA26+
  • MAX6392KA26+T
  • MAX6392KA26-T
  • MAX6392KA29+
  • MAX6392KA29+T
  • MAX6392KA29-T
  • MAX6392KA31+
  • MAX6392KA31+T
  • MAX6392KA31-T
  • MAX6392KA44+
  • MAX6392KA44+T
  • MAX6392KA44-T
  • MAX6392KA46+
  • MAX6392KA46+T
  • MAX6392KA46-T
  • MAX6394US240D1+T
  • MAX6394US240D2+T
  • MAX6394US240D3+
  • MAX6394US240D3+T
  • MAX6394US240D4+T
  • MAX6394US294D1+T
  • MAX6394US294D2+T
  • MAX6394US294D3+T
  • MAX6394US294D4+T
  • MAX6394US300D1+
  • MAX6394US300D1+T
  • MAX6394US300D2+
  • MAX6394US300D2+T
  • MAX6394US300D3+T
  • MAX6394US300D4+T
  • MAX6394US310D1+T
  • MAX6394US310D2+T
  • MAX6394US310D3+
  • MAX6394US310D3+T
  • MAX6394US310D4+
  • MAX6394US310D4+T
  • MAX6394US317D1+
  • MAX6394US317D1+T
  • MAX6394US317D1/V+
  • MAX6394US317D1/V+T
  • MAX6394US317D2+
  • MAX6394US317D2+T
  • MAX6394US317D2/V+
  • MAX6394US317D2/V+T
  • MAX6394US317D3+
  • MAX6394US317D3+T
  • MAX6394US317D4+T
  • MAX6394US445D1+T
  • MAX6394US445D2+T
  • MAX6394US445D3+T
  • MAX6394US445D4+T
  • MAX6394US455D1+
  • MAX6394US455D1+T
  • MAX6394US455D2+
  • MAX6394US455D2+T
  • MAX6394US455D3+
  • MAX6394US455D3+T
  • MAX6394US455D4+T
  • MAX6394US470D1+
  • MAX6394US470D1+T
  • MAX6394US470D1/V+
  • MAX6394US470D1/V+T
  • MAX6394US470D2+T
  • MAX6394US470D3+T
  • MAX6394US470D4+T
  • MAX6394US480D1+
  • MAX6394US480D1+T
  • MAX6394US480D2+
  • MAX6394US480D2+T
  • MAX6394US480D3+
  • MAX6394US480D3+T
  • MAX6394US480D3/V+
  • MAX6394US480D3/V+T
  • MAX6394US480D4+T
  • MAX6397LATA+
  • MAX6397LATA+T
  • MAX6397LATA-T
  • MAX6397MATA+
  • MAX6397MATA+T
  • MAX6397MATA-T
  • MAX6397SATA+
  • MAX6397SATA+T
  • MAX6397SATA-T
  • MAX6397TATA+
  • MAX6397TATA+T
  • MAX6397TATA-T
  • MAX6397VATA+T
  • MAX6397VATA-T
  • MAX6397WATA+T
  • MAX6397YATA+T
  • MAX6397YATA-T
  • MAX6397ZATA+T
  • MAX6397ZATA-T
  • MAX6398ATT+
  • MAX6398ATT+T
  • MAX6398ATT-T
  • MAX6399ATA+
  • MAX6399ATA+T
  • MAX6399ATA-T
  • MAX639CPA+
  • MAX639CSA+
  • MAX639CSA+T
  • MAX639EPA+
  • MAX639ESA+
  • MAX639ESA+T
  • MAX639ESA+T_1
  • MAX639MJA
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

     
    Status:
    Package:
    Temperature:

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