Rainbow Electronics MAX864 - Manual

_______________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, capac-
itor size, and switching frequency to be optimized. The
55
Ω
output impedance permits useful output currents
up to 20mA. The MAX864 also has a 1µA logic-con-
trolled 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.
________________________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 Systems
Split Supply for Analog Circuitry
LCD Panels
____________________________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
MAX864
Dual-Output Charge Pump with Shutdown
________________________________________________________________ Maxim Integrated Products 1
MAX864
C1+
IN V+
V-
SHDN FC1 GND FC0
C1-
C2+
V IN V IN V IN
C2-
+2V IN
V IN
(+1.75V TO +6.0V)
-2V IN
__________________Pin Configuration
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
C1+
V+
N.C.
N.C.
IN
GND
N.C.
N.C.
C1-
C2+
GND
C2-
V-
SHDN
FC1
FC0
TOP VIEW
MAX864
QSOP
__________Typical Operating Circuit
19-0478; Rev 0; 3/96
PART
MAX864C/D
MAX864EEE -40°C to +85°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
Dice*
16 QSOP
______________Ordering Information
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
* Contact factory for dice specifications.