3.3V/5V or Adjustable Output, Single-Cell DC-DC Converters

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.

Applications

* 1-Cell Battery-Operated Equipment * Backup Supplies * Detectors * Pagers * Remote Controls

* 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