MAX680

 

Part Number	Replacement	Explanation

Description

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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.

MAX680, MAX681: Typical Operating Circuits Enlarge+

Key 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/Uses

• ±10V from +5V Logic Supply
• ±6V from 3V Lithium Cell
• Battery-Powered Applications
• Data Acquisition
• Handheld Instruments (PDAs, Palmtops)
• Operational Amplifier Power Supplies
• Panel Meters