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MAX1837

MAX1837

24V Internal Switch, 100% Duty Cycle, Step-Down Converters

Data Sheet
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Overview

Description

The MAX1836/MAX1837 high-efficiency step-down converters provide a preset 3.3V or 5V output voltage from supply voltages as high as 24V. Using external feedback resistors, the output voltage can be adjusted from 1.25V to VIN. An internal current-limited switching MOSFET delivers load currents up to 125mA (MAX1836) or 250mA (MAX1837).

The unique current-limited control scheme, operating with duty cycles up to 100%, minimizes the dropout voltage (120mV at 100mA). Additionally, this control scheme reduces supply current under light loads to 12µA. High switching frequencies allow the use of tiny surface-mount inductors and output capacitors.

The MAX1836/MAX1837 step-down converters with internal switching MOSFETs are available in 6-pin SOT23 and 3mm x 3mm TDFN packages, making them ideal for low-cost, low-power, space-sensitive applications. For increased output drive capability, use the MAX1776 step-down converter that uses an internal 24V switch to deliver up to 500mA. For even higher currents, use the MAX1626/MAX1627 step-down controllers that drive an external P-channel MOSFET to deliver up to 20W.
MAX1836, MAX1837: Functional Diagram MAX1836, MAX1837: Functional Diagram Enlarge+

Key Features

  • 4.5V to 24V Input Voltage Range
  • Preset 3.3V or 5V Output
  • Adjustable Output from 1.25V to VIN
  • Output Currents Up to 125mA (MAX1836) or 250mA (MAX1837)
  • Efficiency Over 90%
  • 12µA Quiescent Current
  • 3µA Shutdown Current
  • 100% Maximum Duty Cycle for Low Dropout
  • Small 6-Pin SOT23 and TDFN Packages

Applications/Uses

  • 4mA to 20mA Loop Power Supplies
  • 9V Battery Systems
  • Backup Supplies
  • Distributed Power Systems
  • Handheld Devices
  • Industrial Control Supplies
  • Notebook Computers

Parametric Specs

Part NumberVIN
(V)		VIN
(V)		VOUT1
(V)		VOUT1
(V)		Preset VOUT
(V)		Output Adjust. MethodIOUT1
(A)		Switch TypeDC-DC OutputsOper. Freq.
(kHz)		Design ToolsPackage/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX1836 4.5241.2524
3.3
5
Preset
Resistor
0.125Internal1200EE-Sim
SOT-23/6
SOT/6
TDFN-EP/6
$2.07 @1k
MAX1837 0.25
SOT-23/6
SOT/6
TDFN-EP/6
See All Step-Down Switching Regulators (358)
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.

Design Resources


MAX1837EVKIT: Evaluation Kit for the MAX1836, MAX1837

Technical Documents

User Guide 5861 EE-SIM Design and Simulation Environment User Guide
Reference Schematic 960 Portable Supply Derives +5V and +3.3V Power from USB Port

Quality and Environmental Data

Product Reliability Reports: MAX1837.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Topmark Coding MAX1837

Tools & Models

  • EE-Sim: Design & Simulate MAX1837
  • MAX1837 SIMPLIS Schematic

    • CAD Symbols and Footprints

  • MAX1837ETT33+
  • MAX1837ETT33+T
  • MAX1837ETT50+
  • MAX1837ETT50+T
  • MAX1837EUT33
  • MAX1837EUT33#G16
  • MAX1837EUT33#TG16
  • MAX1837EUT33+
  • MAX1837EUT33+T
  • MAX1837EUT33-T
  • MAX1837EUT50
  • MAX1837EUT50#G16
  • MAX1837EUT50#TG16
  • MAX1837EUT50+
  • MAX1837EUT50+T
  • MAX1837EUT50-T
    •

    Quality And Environmental

    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 >

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    Tools & Models

    Technical Docs

    Type ID PDF Title
    User Guide 5861 EE-SIM Design and Simulation Environment User Guide
    Reference Schematic 960 Portable Supply Derives +5V and +3.3V Power from USB Port

    Reference Designs

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    Reference Circuit960Portable Supply Derives +5V and +3.3V Power from USB Port
    Evaluation Board2515MAX1837EVKIT Evaluation Kit for the MAX1836, MAX1837