Analog Devices Inc.

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 withinternal switching MOSFETs are available in 6-pinSOT23 and 3mm x 3mm TDFN packages, making themideal for low-cost, low-power, space-sensitive applications.For increased output drive capability, use theMAX1776 step-down converter that uses an internal24V switch to deliver up to 500mA. For even higher currents,use the MAX1626/MAX1627 step-down controllersthat drive an external P-channel MOSFET todeliver up to 20W.Applications4mA to 20mA Loop Power Supplies9V Battery SystemsBackup SuppliesDistributed Power SystemsHandheld DevicesIndustrial Control SuppliesNotebook Computers