Rainbow Electronics MAX681 - Manual

________________General Description
The MAX680/MAX681 are monolithic, CMOS, dual
charge-pump voltage converters that provide ±10V out-
puts from a +5V input voltage. The MAX680/MAX681 pro-
vide both a positive step-up charge pump to develop
+10V from +5V input and an inverting charge pump to
generate the -10V output. Both parts have an on-chip,
8kHz oscillator. The MAX681 has the capacitors internal to
the package, and the MAX680 requires four external
capacitors to produce both positive and negative voltages
from a single supply.
The output source impedances are typically 150
Ω
, pro-
viding useful output currents up to 10mA. The low quies-
cent current and high efficiency make this device suitable
for a variety of applications that need both positive and
negative voltages generated from a single supply.
The MAX864/MAX865 are also recommended for new
designs. The MAX864 operates at up to 200kHz and uses
smaller capacitors. The MAX865 comes in the smaller
µMAX package.
________________________Applications
The MAX680/MAX681 can be used wherever a single
positive supply is available and where positive and nega-
tive voltages are required. Common applications include
generating ±6V from a 3V battery and generating ±10V
from the standard +5V logic supply (for use with analog
circuitry). Typical applications include:
____________________________Features
♦ 95% Voltage-Conversion Efficiency
♦ 85% Power-Conversion Efficiency
♦ +2V to +6V Voltage Range
♦ Only Four External Capacitors Required (MAX680)
♦ No Capacitors Required (MAX681)
♦ 500µA Supply Current
♦ Monolithic CMOS Design
MAX680/MAX681
+5V to ±10V Voltage Converters
________________________________________________________________ Maxim Integrated Products 1
V CC C2-
GND V-
1
2
8
7
V+
C1+ C2+
C1-
MAX680
DIP/SO
TOP VIEW
3
4
6
5
14
13
12
11
10
9
8
1
2
3
4
5
6
7
V CC
V CC
V CC
V
CC
C2+
C1-
C1-
V+
MAX681
V+
GND
GND V-
C2-
C2-
DIP
_________Typical Operating Circuits
MAX680 +10V
4.7 µ F
4.7 µ F
4.7 µ F
4.7 µ F -10V
GND
+10V
-10V
GND
FOUR PINS REQUIRED
(MAX681 ONLY)
+5V
GND
GND
+5V
C1-
C1+
V-
V+
C2-
V
CC
GND
+5V to ±10V CONVERTER
MAX681
V-
V+
V CC
GND
C1+
_________________Pin Configurations
19-0896; Rev 1; 7/96
PART
MAX680 CPA
MAX680CSA
MAX680C/D 0°C to +70°C
0°C to +70°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
8 Plastic DIP
8 Narrow SO
Dice
_______________Ordering Information
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAX680EPA
MAX680ESA -40°C to +85°C
-40°C to +85°C 8 Plastic DIP
8 Narrow SO
MAX680MJA -55°C to +125°C 8 CERDIP
MAX681 CPD
MAX681EPD -40°C to +85°C
0°C to +70°C 14 Plastic DIP
14 Plastic DIP
±6V from 3V Lithium Cell
Hand-Held Instruments
Data-Acquisition Systems
Panel Meters
±10V from +5V Logic
Supply
Battery-Operated
Equipment
Operational Amplifier
Power Supplies