MAX865EUA+T

The MAX865 is a CMOS charge-pump DC-DC converter in an ultra-small μMAX package. It produces positive and negative outputs from a single positive input, and requires only four capacitors. The charge pump first doubles the input voltage, then inverts the doubled voltage. The input voltage ranges from +1.5V to +6.0V. The MAX865 contains all the circuitry needed to implement a voltage doubler/inverter. Only four external capacitors are needed. These may be polarized electrolytic or ceramic capacitors with values ranging from 1μF to 100μF. The MAX865 is not a voltage regulator: the output source resistance of either charge pump is approximately 150Ω at room temperature with VIN = +5V, and V+ and V- will approach +10V and -10V, respectively, when lightly loaded.

Applications

• Low-Voltage GaAsFET Bias in Wireless Handsets
• VCO and GaAsFET Supplies
• Split Supply from 3 Ni Cells or 1 Li+ Cell
• Low-Cost Split Supply for Low-Voltage Data-Acquisition Systems
• Split Supply for Analog Circuitry
• LCD Panels

Key features

• 1.11mm-High μMAX Package
• Compact: Circuit Fits in 0.08in²
• Requires Only Four Capacitors
• Dual Outputs (positive and negative)
• +1.5V to +6.0V Input Voltage
• 20kHz (min) Frequency (above the audio range)
• The internal oscillator is guaranteed to be between 20kHz and 38kHz, keeping noise above the audio range while consuming minimal supply current.
• A 75Ω output impedance permits useful output currents up to 20mA.