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, providing 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.
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
Applications
The MAX680/MAX681 can be used wherever a singlepositive supply is
available and where positive and negative 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:
±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
