MAX1836

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


Please check latest availability status for a specific part variant.

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

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


Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
IOUT1
(A)
Switch Type
minmaxminmaxmax
MAX1836 4.5241.25240.125Internal
MAX1837 0.25

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.

MAX1837EVKIT: Evaluation Kit for the MAX1836, MAX1837

Tools & Models

  • EE-Sim: Design & Simulate MAX1836
  • MAX1836 SIMPLIS Schematic
  • Product Reliability Reports: MAX1836.pdf 
    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 >
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