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