19-0478; Rev 0; 3/96
Dual-Output Charge Pump with Shutdown
_______________General Description
The MAX864 CMOS, charge-p...
19-0478; Rev 0; 3/96
Dual-Output Charge Pump with Shutdown
_______________General Description
The MAX864
CMOS, charge-pump, DC-DC
voltage converter produces a positive and a negative output 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 +1.75V to +6.0V. The internal oscillator can be pin-programmed from 7kHz to 185kHz, allowing the quiescent current, capacitor size, and switching frequency to be optimized. The 55Ω output impedance permits useful output currents up to 20mA. The MAX864 also has a 1µA logic-controlled shutdown. The MAX864 comes in a 16-pin QSOP package that uses the same board area as a standard 8-pin SOIC. For more space-sensitive applications, the MAX865 is available in an 8-pin µMAX package, which uses half the board area of the MAX864.
____________________________Features
o Requires Only Four
Capacitors o Dual Outputs (Positive and Negative) o Low Input
Voltages: +1.75V to +6.0V o 1µA Logic-Controlled Shutdown o Selectable Frequencies Allow Optimization of Capacitor Size and Supply Current
MAX864
______________Ordering Information
PART MAX864C/D MAX864EEE TEMP. RANGE 0°C to +70°C -40°C to +85°C PIN-PACKAGE Dice* 16 QSOP
________________________Applications
Low-
Voltage GaAsFET Bias in Wireless Handsets VCO and GaAsFET Supply Split Supply from 2 to 4 Ni Cells or 1 Li+ Cell Low-Cost Split Supply for Low-
Voltage Data-Acquisition...