MAX864

Features:

 Requires Only Four Capacitors
 Dual Outputs (Positive and Negative)
 Low Input Voltages: +1.75V to +6.0V
 1µA Logic-Controlled Shutdown
 Selectable Frequencies Allow Optimization of Capacitor Size and Supply Current


Application

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 Systems
Split Supply for Analog Circuitry
LCD Panels


Pinout




Specifications

V+ to GND ..............................................................-0.3V to +12V
SHDN, FC0, FC1 to GND .............................-0.3V to (V+ + 0.3V)
IN to GND ..............................................................-0.3V to +6.2V
V- to GND ...............................................................+0.3V to -12V
V- Output Current .............................................................100mA
V- Short Circuit to GND ..............................................IndefiniteOperating Temperature Range
MAX864EEE...................................................-40°C to +85°C Continuous Power Dissipation (TA = +70°C)
QSOP (derate 8.70mW/°C above +70°C).....................696mW
Storage Temperature Range ............................ -65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C


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 of MAX864 can be pin-programmed from 7kHz to 185kHz, allowing the quiescent current, capacitor size, and switching frequency to be optimized. The55½ output impedance permits useful output currents up to 20mA. The MAX864 also has a 1µA logic-controlledshutdown.
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.