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