MAX639
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MAX639

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

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Low Supply Current, High-Efficiency Over Wide Load Range

Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Models 6
1ku List Price Starting From $4.62
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
Additional Details
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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.

Applications

  • 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 Models 6
1ku List Price Starting From $4.62

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Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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MAX639EPA+
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MAX639ESA+
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MAX639ESA+T
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PCN

Jun 2, 2023

- 2361E

WAFER FAB

MAX639CSA+

PRODUCTION

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PRODUCTION

MAX639ESA+

PRODUCTION

MAX639ESA+T

PRODUCTION

Oct 30, 2020

- 1702R2

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MAX639CSA+

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Part Models

Product Lifecycle

PCN

Jun 2, 2023

- 2361E

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WAFER FAB

MAX639CSA+

PRODUCTION

MAX639CSA+T

PRODUCTION

MAX639ESA+

PRODUCTION

MAX639ESA+T

PRODUCTION

Oct 30, 2020

- 1702R2

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ASSEMBLY

MAX639CSA+

PRODUCTION

MAX639CSA+T

PRODUCTION

MAX639ESA+

PRODUCTION

MAX639ESA+T

PRODUCTION

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