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Charge Pumps 
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A charge pump (or Switched Capacitor Converter) IC converts, and optionally regulates, voltages using switching technology and capacitive-energy storage elements. Charge pumps offer high-efficiency and compact solutions with an inductor-less design. Unregulated charge pumps maintain a fixed integer ratio of input to output voltage and exhibit higher efficiency and compact solution size than buck or boost converters. Regulated charge pumps maintain a constant output with a varying voltage input. Maxim’s offerings include both unregulated and regulated output charge pumps that support a wide range of output power.
Technical Documentation
Featured Products
MAX77932C 8A Dual-Phase Switched-Capacitor Converter
The MAX77932C is a standalone, dual-phase switched-capacitor converter with integrated power swi...
- 8A Switched Capacitor Converter
- 2S to 1S Battery Voltage Conversion (VOUT = VIN/2)
- Integrated Power Switches
- Low IQ: 30μA Operating, 4μA Shutdown
- Soft-Start with Programmable Current and Timeout
- Programmable Input Overvoltage Lockout
- Programmable Output Overvoltage Lockout
- Programmable Overcurrent Protection
- Programmable Switching Frequency 0.25MHz to 1.5MHz
- Thermal Alarm and Protection
- Chip Enable Input
- Power Good Indicator Output
- Frequency Dithering
- I2C Interface with Interrupt
MAX1044 Switched-Capacitor Voltage Converters
The MAX1044 and ICL7660 are monolithic, CMOS switched-capacitor voltage converters that invert, ...
- Miniature µMAX Package
- 1.5V to 10.0V Operating Supply Voltage Range
- 98% Typical Power-Conversion Efficiency
- Invert, Double, Divide, or Multiply Input Voltages
- BOOST Pin Increases Switching Frequencies (MAX1044)
- No-Load Supply Current: 200µA Max at 5V
- No External Diode Required for Higher-Voltage Operation
ICL7660 Switched-Capacitor Voltage Converters
The MAX1044 and ICL7660 are monolithic, CMOS switched-capacitor voltage converters that invert, ...
- Miniature µMAX Package
- 1.5V to 10.0V Operating Supply Voltage Range
- 98% Typical Power-Conversion Efficiency
- Invert, Double, Divide, or Multiply Input Voltages
- BOOST Pin Increases Switching Frequencies (MAX1044)
- No-Load Supply Current: 200µA Max at 5V
- No External Diode Required for Higher-Voltage Operation
MAX680 +5V to ±10V Voltage Converters
The MAX680/MAX681 are monolithic, CMOS, dual charge-pump voltage converters that provide ±10V ou...
- 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
MAX681 +5V to ±10V Voltage Converters
The MAX680/MAX681 are monolithic, CMOS, dual charge-pump voltage converters that provide ±10V ou...
- 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
MAX16945 30mA Inverting Charge Pump in SOT23 for EMI-Sensitive Automotive Applications
The MAX16945 ultra-small, monolithic, CMOS charge-pump voltage inverter accepts an input voltage...
- +1.4V to +5.5V Input Voltage Range
- 30mA Guaranteed Output Current at +105°C
- Slew-Rate Limited to Reduce EMI
- 0.1µA Logic-Controlled Shutdown
- Low 12Ω Output Resistance
- Startup Current Limited
- 6-Pin SOT23 Package
- AEC-Q100 Qualified
MAX860 50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
The MAX860/MAX861 charge-pump voltage converters invert input voltages ranging from +1.5V to +5....
- 8-Pin, 1.11mm High µMAX Package
- Invert or Double the Input Supply Voltage
- Three Selectable Switching Frequencies
- High Frequency Reduces Capacitor Size
- 87% Efficiency at 50mA
- 200µA Quiescent Current (MAX860)
- 1µA Shutdown Supply Current
- 600mV Voltage Drop at 50mA Load
- 12Ω Output Resistance
MAX861 50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
The MAX860/MAX861 charge-pump voltage converters invert input voltages ranging from +1.5V to +5....
- 8-Pin, 1.11mm High µMAX Package
- Invert or Double the Input Supply Voltage
- Three Selectable Switching Frequencies
- High Frequency Reduces Capacitor Size
- 87% Efficiency at 50mA
- 200µA Quiescent Current (MAX860)
- 1µA Shutdown Supply Current
- 600mV Voltage Drop at 50mA Load
- 12Ω Output Resistance
MAX1595 Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump
The MAX1595 charge-pump regulator generates either 3.3V or 5V from a 1.8V to 5.5V input. The uni...
- Ultra-Small: Requires Only Three Ceramic Capacitors
- No Inductors Required
- Up to 125mA Output Current
- Regulated ±3% Output Voltage
- 1MHz Switching Frequency
- 1.8V to 5.5V Input Voltage
- 220µA Quiescent Current
- 0.1µA Shutdown Current
- Load Disconnect in Shutdown
MAX1683 Switched-Capacitor Voltage Doublers
The ultra-small MAX1682/MAX1683 monolithic, CMOS charge-pump voltage doublers accept input volta...
- 5-Pin SOT23 Package
- +2.0V to +5.5V Input Voltage Range
- 98% Voltage-Conversion Efficiency
- 110µA Quiescent Current (MAX1682)
- Requires Only Two Capacitors
- Up to 45mA Output Current
MAX1682 Switched-Capacitor Voltage Doublers
The ultra-small MAX1682/MAX1683 monolithic, CMOS charge-pump voltage doublers accept input volta...
- 5-Pin SOT23 Package
- +2.0V to +5.5V Input Voltage Range
- 98% Voltage-Conversion Efficiency
- 110µA Quiescent Current (MAX1682)
- Requires Only Two Capacitors
- Up to 45mA Output Current
MAX1697 60mA, SOT23 Inverting Charge Pump with Shutdown
The MAX1697 ultra-small, monolithic, CMOS charge-pump voltage inverter accepts an input voltage ...
- 60mA Output Current
- Low 12Ω Output Resistance
- 150µA Supply Current (MAX1697R)
- Requires Only Two 1µF Capacitors (MAX1697U)
- Start-Up Current Limited
- +1.25V to +5.5V Input Voltage Range
- Slew-Rate Limited to Reduce EMI
MAX5008 Regulated 5V USB Charge Pump with Programmable Current Limit
The MAX5008 charge-pump regulator generates a regulated 5V output up to 125mA with a 2.95V to 5....
- Regulated 5V Output Up to 125mA
- Indefinite Short-Circuit Protection
- Adjustable Output Current Limit
- No Inductors Required
- 0.1µA Shutdown Current
- Thermal Shutdown
- Fault Output Indicates Overcurrent or Output Voltage Out of Regulation
- 2.95V to 5.5V Input Voltage Range
- 10-Pin µMAX Package
MAX881R Low-Noise Bias Supply in µMAX with Power OK for GaAsFET PA
The MAX881R low-noise, inverting power supply is designed for biasing GaAsFET power amplifiers i...
- Small µMAX Package
- 1mVP-P Output Voltage Ripple and Noise
- Power-OK Signal to Control GaAsFET Drain Switch
- 0.05µA Logic-Controlled Shutdown
- 1ms Guaranteed Startup
- 2.5V to 5.5V Input
- -0.5V to (-VIN + 0.6V) Output at up to 4mA
- Operates with One 4.7µF and Three 0.22µF Capacitors (no inductors needed)
MAX1720 SOT23, Switched-Capacitor Voltage Inverters with Shutdown
The ultra-small MAX1719/MAX1720/MAX1721 monolithic, CMOS charge-pump inverters accept input volt...
- 1nA Logic-Controlled Shutdown
- 6-Pin SOT23 Package
- 99.9% Voltage Conversion Efficiency
- 50µA Quiescent Current (MAX1720)
- +1.5V to +5.5V Input Voltage Range
- 25mA Output Current
- Requires Only Two 1µF Capacitors (MAX1719/MAX1721)
MAX1721 SOT23, Switched-Capacitor Voltage Inverters with Shutdown
The ultra-small MAX1719/MAX1720/MAX1721 monolithic, CMOS charge-pump inverters accept input volt...
- 1nA Logic-Controlled Shutdown
- 6-Pin SOT23 Package
- 99.9% Voltage Conversion Efficiency
- 50µA Quiescent Current (MAX1720)
- +1.5V to +5.5V Input Voltage Range
- 25mA Output Current
- Requires Only Two 1µF Capacitors (MAX1719/MAX1721)
MAX1719 SOT23, Switched-Capacitor Voltage Inverters with Shutdown
The ultra-small MAX1719/MAX1720/MAX1721 monolithic, CMOS charge-pump inverters accept input volt...
- 1nA Logic-Controlled Shutdown
- 6-Pin SOT23 Package
- 99.9% Voltage Conversion Efficiency
- 50µA Quiescent Current (MAX1720)
- +1.5V to +5.5V Input Voltage Range
- 25mA Output Current
- Requires Only Two 1µF Capacitors (MAX1719/MAX1721)
MAX871 Switched-Capacitor Voltage Inverters
The ultra-small MAX870/MAX871 monolithic, CMOS charge-pump inverters accept input voltages rangi...
- 5-Pin SOT23-5 Package
- 99% Voltage Conversion Efficiency
- Invert Input Supply Voltage
- 0.7mA Quiescent Current (MAX870)
- +1.4V to +5.5V Input Voltage
- Require Only Two Capacitors
- 25mA Output Current
- Shutdown Control
MAX870 Switched-Capacitor Voltage Inverters
The ultra-small MAX870/MAX871 monolithic, CMOS charge-pump inverters accept input voltages rangi...
- 5-Pin SOT23-5 Package
- 99% Voltage Conversion Efficiency
- Invert Input Supply Voltage
- 0.7mA Quiescent Current (MAX870)
- +1.4V to +5.5V Input Voltage
- Require Only Two Capacitors
- 25mA Output Current
- Shutdown Control
MAX1759 Buck/Boost Regulating Charge Pump in µMAX
The MAX1759 is a buck/boost regulating charge pump that generates a regulated output voltage fro...
- Regulated Output Voltage (Fixed 3.3V or Adjustable 2.5V to 5.5V)
- 100mA Guaranteed Output Current
- +1.6V to +5.5V Input Voltage Range
- Low 50µA Quiescent Supply Current
- 1µA Shutdown Mode
- Load Disconnected from Input in Shutdown
- High 1.5MHz Operating Frequency
- Uses Small Ceramic Capacitors
- Short-Circuit Protection and Thermal Shutdown
- Small 10-Pin µMAX Package
MAX77932C 8A Dual-Phase Switched-Capacitor Converter
The MAX77932C is a standalone, dual-phase switched-capacitor converter with integrated power swi...
- 8A Switched Capacitor Converter
- 2S to 1S Battery Voltage Conversion (VOUT = VIN/2)
- Integrated Power Switches
- Low IQ: 30μA Operating, 4μA Shutdown
- Soft-Start with Programmable Current and Timeout
- Programmable Input Overvoltage Lockout
- Programmable Output Overvoltage Lockout
- Programmable Overcurrent Protection
- Programmable Switching Frequency 0.25MHz to 1.5MHz
- Thermal Alarm and Protection
- Chip Enable Input
- Power Good Indicator Output
- Frequency Dithering
- I2C Interface with Interrupt
MAX1044 Switched-Capacitor Voltage Converters
The MAX1044 and ICL7660 are monolithic, CMOS switched-capacitor voltage converters that invert, ...
- Miniature µMAX Package
- 1.5V to 10.0V Operating Supply Voltage Range
- 98% Typical Power-Conversion Efficiency
- Invert, Double, Divide, or Multiply Input Voltages
- BOOST Pin Increases Switching Frequencies (MAX1044)
- No-Load Supply Current: 200µA Max at 5V
- No External Diode Required for Higher-Voltage Operation
ICL7660 Switched-Capacitor Voltage Converters
The MAX1044 and ICL7660 are monolithic, CMOS switched-capacitor voltage converters that invert, ...
- Miniature µMAX Package
- 1.5V to 10.0V Operating Supply Voltage Range
- 98% Typical Power-Conversion Efficiency
- Invert, Double, Divide, or Multiply Input Voltages
- BOOST Pin Increases Switching Frequencies (MAX1044)
- No-Load Supply Current: 200µA Max at 5V
- No External Diode Required for Higher-Voltage Operation
MAX680 +5V to ±10V Voltage Converters
The MAX680/MAX681 are monolithic, CMOS, dual charge-pump voltage converters that provide ±10V ou...
- 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
MAX681 +5V to ±10V Voltage Converters
The MAX680/MAX681 are monolithic, CMOS, dual charge-pump voltage converters that provide ±10V ou...
- 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
MAX16945 30mA Inverting Charge Pump in SOT23 for EMI-Sensitive Automotive Applications
The MAX16945 ultra-small, monolithic, CMOS charge-pump voltage inverter accepts an input voltage...
- +1.4V to +5.5V Input Voltage Range
- 30mA Guaranteed Output Current at +105°C
- Slew-Rate Limited to Reduce EMI
- 0.1µA Logic-Controlled Shutdown
- Low 12Ω Output Resistance
- Startup Current Limited
- 6-Pin SOT23 Package
- AEC-Q100 Qualified
MAX860 50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
The MAX860/MAX861 charge-pump voltage converters invert input voltages ranging from +1.5V to +5....
- 8-Pin, 1.11mm High µMAX Package
- Invert or Double the Input Supply Voltage
- Three Selectable Switching Frequencies
- High Frequency Reduces Capacitor Size
- 87% Efficiency at 50mA
- 200µA Quiescent Current (MAX860)
- 1µA Shutdown Supply Current
- 600mV Voltage Drop at 50mA Load
- 12Ω Output Resistance
MAX861 50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
The MAX860/MAX861 charge-pump voltage converters invert input voltages ranging from +1.5V to +5....
- 8-Pin, 1.11mm High µMAX Package
- Invert or Double the Input Supply Voltage
- Three Selectable Switching Frequencies
- High Frequency Reduces Capacitor Size
- 87% Efficiency at 50mA
- 200µA Quiescent Current (MAX860)
- 1µA Shutdown Supply Current
- 600mV Voltage Drop at 50mA Load
- 12Ω Output Resistance
MAX1595 Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump
The MAX1595 charge-pump regulator generates either 3.3V or 5V from a 1.8V to 5.5V input. The uni...
- Ultra-Small: Requires Only Three Ceramic Capacitors
- No Inductors Required
- Up to 125mA Output Current
- Regulated ±3% Output Voltage
- 1MHz Switching Frequency
- 1.8V to 5.5V Input Voltage
- 220µA Quiescent Current
- 0.1µA Shutdown Current
- Load Disconnect in Shutdown
MAX1683 Switched-Capacitor Voltage Doublers
The ultra-small MAX1682/MAX1683 monolithic, CMOS charge-pump voltage doublers accept input volta...
- 5-Pin SOT23 Package
- +2.0V to +5.5V Input Voltage Range
- 98% Voltage-Conversion Efficiency
- 110µA Quiescent Current (MAX1682)
- Requires Only Two Capacitors
- Up to 45mA Output Current
MAX1682 Switched-Capacitor Voltage Doublers
The ultra-small MAX1682/MAX1683 monolithic, CMOS charge-pump voltage doublers accept input volta...
- 5-Pin SOT23 Package
- +2.0V to +5.5V Input Voltage Range
- 98% Voltage-Conversion Efficiency
- 110µA Quiescent Current (MAX1682)
- Requires Only Two Capacitors
- Up to 45mA Output Current
MAX1697 60mA, SOT23 Inverting Charge Pump with Shutdown
The MAX1697 ultra-small, monolithic, CMOS charge-pump voltage inverter accepts an input voltage ...
- 60mA Output Current
- Low 12Ω Output Resistance
- 150µA Supply Current (MAX1697R)
- Requires Only Two 1µF Capacitors (MAX1697U)
- Start-Up Current Limited
- +1.25V to +5.5V Input Voltage Range
- Slew-Rate Limited to Reduce EMI
MAX5008 Regulated 5V USB Charge Pump with Programmable Current Limit
The MAX5008 charge-pump regulator generates a regulated 5V output up to 125mA with a 2.95V to 5....
- Regulated 5V Output Up to 125mA
- Indefinite Short-Circuit Protection
- Adjustable Output Current Limit
- No Inductors Required
- 0.1µA Shutdown Current
- Thermal Shutdown
- Fault Output Indicates Overcurrent or Output Voltage Out of Regulation
- 2.95V to 5.5V Input Voltage Range
- 10-Pin µMAX Package
MAX881R Low-Noise Bias Supply in µMAX with Power OK for GaAsFET PA
The MAX881R low-noise, inverting power supply is designed for biasing GaAsFET power amplifiers i...
- Small µMAX Package
- 1mVP-P Output Voltage Ripple and Noise
- Power-OK Signal to Control GaAsFET Drain Switch
- 0.05µA Logic-Controlled Shutdown
- 1ms Guaranteed Startup
- 2.5V to 5.5V Input
- -0.5V to (-VIN + 0.6V) Output at up to 4mA
- Operates with One 4.7µF and Three 0.22µF Capacitors (no inductors needed)
MAX1720 SOT23, Switched-Capacitor Voltage Inverters with Shutdown
The ultra-small MAX1719/MAX1720/MAX1721 monolithic, CMOS charge-pump inverters accept input volt...
- 1nA Logic-Controlled Shutdown
- 6-Pin SOT23 Package
- 99.9% Voltage Conversion Efficiency
- 50µA Quiescent Current (MAX1720)
- +1.5V to +5.5V Input Voltage Range
- 25mA Output Current
- Requires Only Two 1µF Capacitors (MAX1719/MAX1721)
MAX1721 SOT23, Switched-Capacitor Voltage Inverters with Shutdown
The ultra-small MAX1719/MAX1720/MAX1721 monolithic, CMOS charge-pump inverters accept input volt...
- 1nA Logic-Controlled Shutdown
- 6-Pin SOT23 Package
- 99.9% Voltage Conversion Efficiency
- 50µA Quiescent Current (MAX1720)
- +1.5V to +5.5V Input Voltage Range
- 25mA Output Current
- Requires Only Two 1µF Capacitors (MAX1719/MAX1721)
MAX1719 SOT23, Switched-Capacitor Voltage Inverters with Shutdown
The ultra-small MAX1719/MAX1720/MAX1721 monolithic, CMOS charge-pump inverters accept input volt...
- 1nA Logic-Controlled Shutdown
- 6-Pin SOT23 Package
- 99.9% Voltage Conversion Efficiency
- 50µA Quiescent Current (MAX1720)
- +1.5V to +5.5V Input Voltage Range
- 25mA Output Current
- Requires Only Two 1µF Capacitors (MAX1719/MAX1721)
MAX871 Switched-Capacitor Voltage Inverters
The ultra-small MAX870/MAX871 monolithic, CMOS charge-pump inverters accept input voltages rangi...
- 5-Pin SOT23-5 Package
- 99% Voltage Conversion Efficiency
- Invert Input Supply Voltage
- 0.7mA Quiescent Current (MAX870)
- +1.4V to +5.5V Input Voltage
- Require Only Two Capacitors
- 25mA Output Current
- Shutdown Control
MAX870 Switched-Capacitor Voltage Inverters
The ultra-small MAX870/MAX871 monolithic, CMOS charge-pump inverters accept input voltages rangi...
- 5-Pin SOT23-5 Package
- 99% Voltage Conversion Efficiency
- Invert Input Supply Voltage
- 0.7mA Quiescent Current (MAX870)
- +1.4V to +5.5V Input Voltage
- Require Only Two Capacitors
- 25mA Output Current
- Shutdown Control
MAX1759 Buck/Boost Regulating Charge Pump in µMAX
The MAX1759 is a buck/boost regulating charge pump that generates a regulated output voltage fro...
- Regulated Output Voltage (Fixed 3.3V or Adjustable 2.5V to 5.5V)
- 100mA Guaranteed Output Current
- +1.6V to +5.5V Input Voltage Range
- Low 50µA Quiescent Supply Current
- 1µA Shutdown Mode
- Load Disconnected from Input in Shutdown
- High 1.5MHz Operating Frequency
- Uses Small Ceramic Capacitors
- Short-Circuit Protection and Thermal Shutdown
- Small 10-Pin µMAX Package
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