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 may 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.
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