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General Description

The MAX866 and MAX867 are ultra-small, high-efficiency, CMOS, step-up, DC-DC switching regulators for 1-cell battery-powered systems. The MAX866 accepts a positive input voltage between 0.8V and VOUT and converts it to a higher, pin-selectable output voltage of 3.3V or 5V. The MAX867 adjustable version accepts 0.8V to 6.0V input voltages and generates a higher adjustable output voltage in the 2.7V to 6.0V range. Typical efficiencies are greater than 80. Typical no-load supply current is 100μA (1μA in shutdown).

The MAX866/MAX867 combine ultra-low quiescent supply current and high efficiency to give maximum battery life. Its high switching frequency permits the use of small, low-cost inductors and capacitors. Additionally, internal peak-current limiting protects the IC.

Features

? 0.8V to 6.0V Input Supply Voltage

? 0.9V Guaranteed Start-Up Supply Voltage

? >80 Efficiency Over Wide Load Range

? 100μA No-Load Battery Current (VOUT = 3.3V)

? 1μA Shutdown Mode

? Up to 250kHz Switching Frequency

? ±1.5 Reference Tolerance

? Low-Battery Detector (LBI/LBO)

? Available in Ultra-Small 8-Pin μMAX Package (1.11mm high)

? Circuit Fits in 0.2in2

Applications

?? Pagers

?? Remote Controls

?? Detectors

?? 1-Cell Battery-Operated Equipment

?? Backup Supplies