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+5V to ±10V Voltage Converters

Generates Positive and Negative Doubled Outputs Simultaneously

Product Details

Key Features

Parametric specs for Charge Pumps
Topology Doubler
Dual Output
Inverter
Unregulated
VIN (V) (min) 2
VIN (V) (max) 6
IOUT (A) (typ) 0.01
Unadj. VOUT (V) +2xVIN
-2xVIN
IQ (mA) (max) 2
Switching Frequency (kHz) 8
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins CDIP/8
PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
2.16
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Simplified Block Diagram

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Parameters

Parametric specs for Charge Pumps
Topology Doubler
Dual Output
Inverter
Unregulated
VIN (V) (min) 2
VIN (V) (max) 6
IOUT (A) (typ) 0.01
Unadj. VOUT (V) +2xVIN
-2xVIN
IQ (mA) (max) 2
Switching Frequency (kHz) 8
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins CDIP/8
PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
2.16

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

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.

Simplified Block Diagram

MAX680, MAX681: Typical Operating Circuits MAX680, MAX681: Typical Operating Circuits Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .