MAX1837EUT33-T 24V Internal Switch Integrated Circuit Chip 100 Duty Cycle Step Down Converters

♦ 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)

♦ Internal P-Channel MOSFET

♦ Efficiency Over 90%

♦ 12µA Quiescent Current

♦ 3µA Shutdown Current

♦ 100% Maximum Duty Cycle for Low Dropout

♦ Current-Limiting and Overtemperature Protection

♦ Small 6-Pin SOT23 Package

General 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 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 a 6-pin SOT23 package, making them ideal for low-cost, lowpower, 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 a

Typical Operating Characteristics

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