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Charge Pumps 
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MAX1682
Switched-Capacitor Voltage Doublers
SOT23 Voltage Doubler Needs Only two External Caps; Ultra-Small LCD Supply for PDAs and Cell Phones
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Key Features
Applications/Uses
Parametric specs for Charge Pumps
| Topology | Doubler Unregulated |
| VIN (V) (min) | 2 |
| VIN (V) (max) | 5.5 |
| IOUT (A) (typ) | 0.045 |
| Unadj. VOUT (V) | +2xVIN |
| ICC (mA) (max) | 0.145 |
| Switching Frequency (kHz) | 12 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | SOT23/5 |
| Budgetary Price (See Notes) | 0.75 |
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Simplified Block Diagram
Technical Docs
| Data Sheet | Switched-Capacitor Voltage Doublers | Dec 15, 2010 | |
| Tutorial | Properties of the Charge-Pump Voltage Splitter | ||
| Tutorial | DC-DC Conversion Without Inductors | ||
| Tutorial | Choosing the Right Power-Supply IC for your Application | ||
| App Note | Doubler/Inverter Charge Pumps Divide by Two | ||
| App Note | Negative Step-Down Converter Requires No Inductor | ||
| App Note | Simple Current Limiter Is Programmable |
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 Unregulated |
| VIN (V) (min) | 2 |
| VIN (V) (max) | 5.5 |
| IOUT (A) (typ) | 0.045 |
| Unadj. VOUT (V) | +2xVIN |
| ICC (mA) (max) | 0.145 |
| Switching Frequency (kHz) | 12 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | SOT23/5 |
| Budgetary Price (See Notes) | 0.75 |
Key Features
- 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
Applications/Uses
- Cell Phones
- Handy Terminals
- PDAs
- Small LCD Panels
Description
The ultra-small MAX1682/MAX1683 monolithic, CMOS charge-pump voltage doublers accept input voltages ranging from +2.0V to +5.5V. Their high voltage-conversion efficiency (over 98%) and low operating current (110µA for MAX1682) make these devices ideal for both battery-powered and board-level voltage-doubler applications.
Oscillator control circuitry and four power MOSFET switches are included on-chip. The MAX1682 operates at 12kHz, and the MAX1683 operates at 35kHz. A typical application includes generating a 6V supply to power an LCD display in a hand-held PDA. Both parts are available in a 5-pin SOT23 package and can deliver 30mA with a typical voltage drop of 600mV.
Oscillator control circuitry and four power MOSFET switches are included on-chip. The MAX1682 operates at 12kHz, and the MAX1683 operates at 35kHz. A typical application includes generating a 6V supply to power an LCD display in a hand-held PDA. Both parts are available in a 5-pin SOT23 package and can deliver 30mA with a typical voltage drop of 600mV.
Technical Docs
| Data Sheet | Switched-Capacitor Voltage Doublers | Dec 15, 2010 | |
| Tutorial | Properties of the Charge-Pump Voltage Splitter | ||
| Tutorial | DC-DC Conversion Without Inductors | ||
| Tutorial | Choosing the Right Power-Supply IC for your Application | ||
| App Note | Doubler/Inverter Charge Pumps Divide by Two | ||
| App Note | Negative Step-Down Converter Requires No Inductor | ||
| App Note | Simple Current Limiter Is Programmable |
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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