MAX864 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Dual-Output Charge Pump with Shutdown

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, capac-
itor 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-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
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
______________Ordering Information
PART
MAX864C/D
MAX864EEE
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
Dice*
16 QSOP
* Contact factory for dice specifications.
__________Typical Operating Circuit
__________________Pin Configuration
TOP VIEW
C1- 1
C2+ 2
GND 3
C2- 4
V- 5
SHDN 6
FC1 7
FC0 8
MAX864
QSOP
16 C1+
15 V+
14 N.C.
13 N.C.
12 IN
11 GND
10 N.C.
9 N.C.
VIN
(+1.75V TO +6.0V)
IN
V+
C1+
MAX864
C1-
C2+
V-
C2-
FC0 FC1 SHDN GND
V_IN V_IN V_IN
+2VIN
-2VIN
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