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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 150?, 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