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Charge Pumps 
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MAX680
+5V to ±10V Voltage Converters
Generates Positive and Negative Doubled Outputs Simultaneously
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Key Features
Applications/Uses
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
Technical Docs
| Data Sheet | +5V to ±10V Voltage Converters | Jul 23, 2019 | |
| App Note | MOSFET Pass Element Yields 100mV-Dropout Regulator | ||
| App Note | Load-Disconnect Switch Halts Battery Discharge to Protect Rechargeable Batteries |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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.
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.
Technical Docs
| Data Sheet | +5V to ±10V Voltage Converters | Jul 23, 2019 | |
| App Note | MOSFET Pass Element Yields 100mV-Dropout Regulator | ||
| App Note | Load-Disconnect Switch Halts Battery Discharge to Protect Rechargeable Batteries |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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