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General Description

The MAX1832–MAX1835 are high-efficiency step-up converters with complete reverse battery protection that protects the device and the load when the battery is reversed. They feature a built-in synchronous rectifier, which allows for over 90 efficiency and reduces size and cost by eliminating the need for an external Schottky diode.

These step-up converters operate from a +1.5V to +5.5V input voltage range and deliver up to 150mA of load current. The MAX1833EUT/MAX1835EUT (SOT devices) have a fixed 3.3V output voltage. The MAX1833ETT30 (TDFN device) has a fixed 3.0V output voltage. The MAX1832/MAX1834 have adjustable outputs from +2V to +5.5V. In shutdown, the MAX1832/MAX1833 connect the battery input to the voltage output, allowing the input battery to be used as a backup or real-time clock supply when the converter is off (see Selector Guide).

MAX183_EUT devices are available in a miniature 6-pin SOT23 package. The MAX1833ETT30 is available in a 3mm ? 3mm thin DFN package. The MAX1832EVKIT is available to speed designs.

Features

? Reverse Battery Protection for DC-DC Converter and Load

? Up to 90 Efficiency

? No External Diode or FETs Needed

? Internal Synchronous Rectifier

? 4μA Quiescent Current

? <1μA Shutdown Supply Current

? +1.5V to +5.5V Input Voltage Range

? Accurate SHDN Threshold for Low-Battery Cutoff

? BATT Connected to OUT in Shutdown for Backup Power (MAX1832/MAX1833)

? RST Output (MAX1833/MAX1835)

? Fixed 3.3V/3.0V Output Voltage

? Adjustable Output Voltage (MAX1832/MAX1834)

? Up to 150mA Output Current

? Tiny 6-Pin SOT23 Package

? Tiny 6-Pin Thin QFN Package (MAX1833ETT30)

Applications

Medical Diagnostic Equipment

Pagers

Hand-Held Instruments

Remote Wireless Transmitters

Digital Cameras

Cordless Phones

Battery Backup

PC Cards

Local 3.3V or 5V Supply