MAX865 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – Compact, Dual-Output Charge Pump

19-0472; Rev 1; 7/97
Compact, Dual-Output Charge Pump
_______________General Description
The MAX865 is a CMOS charge-pump DC-DC convert-
er 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 volt-
age. The input voltage ranges from +1.5V to +6.0V.
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.
The MAX865 comes in a 1.11mm-high, 8-pin µMAX
package that occupies half the board area of a stan-
dard 8-pin SOIC. For a device with selectable frequen-
cies and logic-controlled shutdown, refer to the MAX864
data sheet.
________________________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
__________________Pin Configuration
TOP VIEW
C1- 1
C2+ 2
C2- 3
V- 4
MAX865
µMAX
8 C1+
7 V+
6 IN
5 GND
____________________________Features
o 1.11mm-High µMAX Package
o Compact: Circuit Fits in 0.08in²
o Requires Only Four Capacitors
o Dual Outputs (positive and negative)
o +1.5V to +6.0V Input Voltage
o 20kHz (min) Frequency (above the audio range)
______________Ordering Information
PART
MAX865C/D
MAX865EUA
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
Dice
8 µMAX
__________Typical Operating Circuit
VIN
(+1.5V to +6.0V)
IN
C1+ _MAX865
V+
C1-
C2+
V-
C2-
GND
+2*VIN
-2*VIN
GND
GND
+V_IN to ±2V_IN CONVERTER
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