Datasheet

General Description
The MAX680/MAX681 are monolithic, CMOS, dual charge-
pump voltage converters that provide ±10V outputs from a
+5V input voltage. The MAX680/MAX681 provide 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 150Ω, provid-
ing useful output currents up to 10mA. The low quiescent
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
19-0896; Rev 2; 7/19
● ±6V from 3V Lithium Cell
● Hand-Held Instruments
● Data-Acquisition Systems
● Panel Meters
● ±10V from +5V Logic
Supply
● Battery-Operated
Equipment
● Operational Amplier
Power Supplies
PART TEMP. RANGE PIN-PACKAGE
MAX680CPA 0°C to +70°C 8 Plastic DIP
MAX680CSA 0°C to +70°C 8 Narrow SO
MAX680C/D 0°C to +70°C Dice
MAX680EPA -40°C to +85°C 8 Plastic DIP
MAX680ESA -40°C to +85°C 8 Narrow SO
MAX680MJA -55°C to +125°C 8 CERDIP
MAX681CPD 0°C to +70°C 14 Plastic DIP
MAX681EPD -40°C to +85°C 14 Plastic DIP
Pin Congurations
Typical Operating Circuits
V
CC
C2-
GNDV-
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
GNDV-
C2-
C2-
DIP
MAX680
+10V
4.7µF
4.7µF
4.7µF
4.7µF
-10V
GND
+10V
-10V
GND
FOUR PINS REQUIRED
(MAX681 ONLY)
+5V
GND
GND
+5V
C1-
C2+
V-
V+
C2-
V
CC
GND
+5V to ±10V CONVERTER
MAX681
V-
V+
V
CC
GND
C1+
Ordering Information
MAX680/MAX681 +5V to ±10V Voltage Converters
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