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

See parametric specs for Step-Down Switching Regulators (409)


Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypePower Good SignalDC-DC OutputsPackage/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX639 411.51.311.5
3
3.3
5
Preset
Resistor
0.225InternalYes1
DICE SALES/N
PDIP/8
SOIC (N)/8
$3.55 @1k
MAX640 3.3
DICE SALES/N
PDIP/8
SOIC (N)/8
$3.55 @1k
MAX653 3
CDIP/8
PDIP/8
SOIC (N)/8
$1.63 @1k

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.
Request Reliability Report for: MAX639 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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:

Related Resources


MAX20710
Integrated, Step-Down Switching Regulator with PMBus

  • High Power Density and Low Component Count
  • Optimized Component Performance and Efficiency with Reduced Design-In Time
  • Increased Power-Supply Reliability with System and IC Self-Protection Features

MAX17760
4.5V to 76V, 300mA, High-Efficiency, Synchronous Step-Down DC-DC Converter

  • Reduces External Components and Total Cost
  • Reduces Number of DC-DC Regulators to Stock
  • Reduces Power Dissipation

MAX20430
Four-Output Mini PMIC for Safety Applications

  • Multiple Functions for Small Size
  • High-Precision for ASIL Applications
  • Diagnostics and Redundant Circuits

MAX18066
High-Efficiency, 4A, Step-Down DC-DC Regulator with Internal Power Switches

  • Feature Integration Shrinks Solution Size
  • High Efficiency Conserves Power
  • Safe, Reliable, Accurate Operation

MAX18166
High-Efficiency, 4A, Step-Down DC-DC Regulator with Internal Power Switches

  • Feature Integration Shrinks Solution Size
  • High Efficiency Conserves Power
  • Safe, Reliable, Accurate Operation

MAX77511
10V Input, Quad-Phase Configurable, 3A/Phase, High-Efficiency Buck Converter

  • 3A/Phase Configurable Buck Regulator
  • 2.3V to 10V Input Voltage Range
  • 0.25V to 5.2V Output Voltage Range

MAX77711
10V Input, Quad-Phase Configurable, 3A/Phase, High-Efficiency Buck Converter

  • 3A/Phase Configurable Buck Regulator
  • 2.3V to 10V Input Voltage Range
  • 0.25V to 5.2V Output Voltage Range

MAX15158, MAX15158A
High-Voltage Multiphase Boost Controller

  • Wide Operating Range
  • Integration Reduces Design Footprint
  • Robust Fault Protection Improves Quality and Reliability

MAX15158A
High-Voltage Multiphase Boost Controller

  • Wide Operating Range
  • Integration Reduces Design Footprint
  • Robust Fault Protection Improves Quality and Reliability

MAX25201
36V Automotive Low-IQ 200kHz to 2.2MHz Synchronous Boost Controller

  • Meets Stringent OEM Module Power Consumption and Performance Specifications
    • 20µA Quiescent Current in Skip Mode
    • ±1.5% FB Voltage Accuracy
    • Output Voltage Range: Fixed or Adjustable Between 3.5V and 60V
  • Enables Crank-Ready Designs
    • Operates Down to 1.8V After Startup
    • Wide Input Supply Range from 4.5V to 36V
  • EMI Reduction Features Reduce Interference with Sensitive Radio Bands Without Sacrificing Wide Input Voltage Range
    • Spread-Spectrum Option
    • Frequency-Synchronization Input
    • Resistor-Programmable Frequency Between 200kHz and 2.2MHz

  • MAX25202
    36V Automotive Low-IQ 200kHz to 2.2MHz Synchronous Boost Controller

  • Meets Stringent OEM Module Power Consumption and Performance Specifications
    • 20µA Quiescent Current in Skip Mode
    • ±1.5% FB Voltage Accuracy
    • Output Voltage Range: Fixed or Adjustable Between 3.5V and 60V
  • Enables Crank-Ready Designs
    • Operates Down to 1.8V After Startup
    • Wide Input Supply Range from 4.5V to 36V
  • EMI Reduction Features Reduce Interference with Sensitive Radio Bands Without Sacrificing Wide Input Voltage Range
    • Spread-Spectrum Option
    • Frequency-Synchronization Input
    • Resistor-Programmable Frequency Between 200kHz and 2.2MHz

  • MAX25200
    36V Automotive Low-IQ 200kHz to 2.2MHz Sepic/Flyback Controller

  • Meets Stringent OEM Module Power Consumption and Performance Specifications
  • 20μA Quiescent Current in Skip Mode
  • ±1.5% FB Voltage Accuracy

  • MAX20499
    Automotive Core Power Supply 5V, 8A/12A Step-Down Converter

  • High-Efficiency DC-DC Converter
  • Up to 12A peak output current:
    • MAX20499A: 8A
    • MAX20499B: 12A
  • Differential Remote Voltage Sensing

  • MAX20076E
    36V, 600mA/1.2A Mini Buck Converter with 3.5µA IQ

    • Synchronous DC-DC Converter with Integrated FETs
    • 20ns Minimum On-Time Small Solution Size Saves Space
    • PGOOD Output and High-Voltage EN Input Simplify Power Sequencing

    MAX25276D
    36V, 600mA/1.2A Mini Buck Converter with 3.5µA IQ

    • Synchronous DC-DC Converter with Integrated FETs
    • 20ns Minimum On-Time Small Solution Size Saves Space
    • PGOOD Output and High-Voltage EN Input Simplify Power Sequencing

    MAX20076D
    36V, 600mA/1.2A Mini Buck Converter with 3.5µA IQ

    • Synchronous DC-DC Converter with Integrated FETs
    • 20ns Minimum On-Time Small Solution Size Saves Space
    • PGOOD Output and High-Voltage EN Input Simplify Power Sequencing

    MAX20075D
    36V, 600mA/1.2A Mini Buck Converter with 3.5µA IQ

    • Synchronous DC-DC Converter with Integrated FETs
    • 20ns Minimum On-Time Small Solution Size Saves Space
    • PGOOD Output and High-Voltage EN Input Simplify Power Sequencing

    MAXM17720
    Integrated 4V-60V, 150mA, Himalaya uSLIC Power Module DC-DC Converter with 50mA Linear Regulator

    • Easy to Use
    • High Efficiency
    • Flexible Design

    MAXM17724
    Integrated 4V-60V, 150mA, Himalaya uSLIC Power Module DC-DC Converter with 50mA Linear Regulator

    • Easy to Use
    • High Efficiency
    • Flexible Design

    MAXM17712
    Integrated 4V-60V, 150mA, Himalaya uSLIC Power Module DC-DC Converter with 50mA Linear Regulator

    • Easy to Use
    • High Efficiency
    • Flexible Design

    MAXM15068
    7.5V to 60V, 200mA Himalaya uSLIC Step-Down Power Module

    • Easy to Use
    • High Efficiency
    • Flexible Design

    MAXM17633
    4.5V to 36V, 2A Himalaya uSLIC Step-Down Power Modules

    • Easy to Use
    • High Efficiency
    • Flexible Design

    MAXM17634
    4.5V to 36V, 2A Himalaya uSLIC Step-Down Power Modules

    • Easy to Use
    • High Efficiency
    • Flexible Design

    MAXM17635
    4.5V to 36V, 2A Himalaya uSLIC Step-Down Power Modules

    • Easy to Use
    • High Efficiency
    • Flexible Design

    MAXM17537
    4.5V to 60V, 3A High-Efficiency, DC-DC Step-Down SiP Power Module with Integrated Inductor

    • Reduces Design Complexity, Manufacturing Risks, and Time to Market
    • Saves Board Space in Space-Constrained Applications
    • Offers Flexibility for Power-Design Optimization

    MAXM17632
    4.5V to 36V, 1A Himalaya uSLIC Step-Down Power Module

    • Easy to Use
    • High Efficiency
    • Flexible Design

    MAXM17631
    4.5V to 36V, 1A Himalaya uSLIC Step-Down Power Module

    • Easy to Use
    • High Efficiency
    • Flexible Design

    MAXM17630
    4.5V to 36V, 1A Himalaya uSLIC Step-Down Power Module

    • Easy to Use
    • High Efficiency
    • Flexible Design