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

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 24
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 24
IOUT1 (A) (max) 0.25
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 200
Design Tools EE-Sim
Package/Pins SOT23/6
TDFN/6
Budgetary
Price (See Notes)
2.3
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 24
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 24
IOUT1 (A) (max) 0.25
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 200
Design Tools generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=7681', '')
Package/Pins SOT23/6
TDFN/6
Budgetary
Price (See Notes)
2.3

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

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.

Simplified Block Diagram

MAX1836, MAX1837: Functional Diagram MAX1836, MAX1837: Functional Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .