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Charge Pumps 
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MAX1719
SOT23, Switched-Capacitor Voltage Inverters with Shutdown
Smallest, High-Efficiency Bias for Small LCD/GaAsFET PA Bias: Small Cap Size, No Inductors and Low Supply Current
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Key Features
Applications/Uses
Parametric specs for Charge Pumps
| Topology | Inverter Unregulated |
| VIN (V) (min) | 1.5 |
| VIN (V) (max) | 5.5 |
| IOUT (A) (typ) | 0.025 |
| Unadj. VOUT (V) | -VIN |
| IQ (mA) (max) | 0.65 |
| Switching Frequency (kHz) | 125 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | SOT23/6 |
| Budgetary Price (See Notes) | 0.8 |
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Simplified Block Diagram
Technical Docs
| Data Sheet | SOT23, Switched-Capacitor Voltage Inverters with Shutdown | Jun 02, 2004 |
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 | Inverter Unregulated |
| VIN (V) (min) | 1.5 |
| VIN (V) (max) | 5.5 |
| IOUT (A) (typ) | 0.025 |
| Unadj. VOUT (V) | -VIN |
| IQ (mA) (max) | 0.65 |
| Switching Frequency (kHz) | 125 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | SOT23/6 |
| Budgetary Price (See Notes) | 0.8 |
Key Features
- 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)
Applications/Uses
- Battery-Powered Applications
- GaAs PA Bias Supply
- Handy-Terminals, PDAs
- Local Negative Supply from a Positive Supply
- Small LCD Panels
Description
The ultra-small MAX1719/MAX1720/MAX1721 monolithic, CMOS charge-pump inverters accept input voltages ranging from +1.5V to +5.5V. The MAX1720 operates at 12kHz, and the MAX1719/MAX1721 operate at 125kHz. High efficiency, small external components, and logic-controlled shutdown make these devices ideal for both battery-powered and board-level voltage conversion applications.
Oscillator control circuitry and four power MOSFET switches are included on-chip. A typical MAX1719/MAX1720/MAX1721 application is generating a -5V supply from a +5V logic supply to power analog circuitry. All three parts come in a 6-pin SOT23 package and can deliver a continuous 25mA output current.
For pin-compatible SOT23 switched-capacitor voltage inverters without shutdown (5-pin SOT23), see the MAX828/MAX829 and MAX870/MAX871 data sheets. For applications requiring more power, the MAX860/MAX861 deliver up to 50mA. For regulated outputs (up to -2 x VIN), refer to the MAX868. The MAX860/MAX861 and MAX868 are available in space-saving µMAX® packages.
Oscillator control circuitry and four power MOSFET switches are included on-chip. A typical MAX1719/MAX1720/MAX1721 application is generating a -5V supply from a +5V logic supply to power analog circuitry. All three parts come in a 6-pin SOT23 package and can deliver a continuous 25mA output current.
For pin-compatible SOT23 switched-capacitor voltage inverters without shutdown (5-pin SOT23), see the MAX828/MAX829 and MAX870/MAX871 data sheets. For applications requiring more power, the MAX860/MAX861 deliver up to 50mA. For regulated outputs (up to -2 x VIN), refer to the MAX868. The MAX860/MAX861 and MAX868 are available in space-saving µMAX® packages.
Technical Docs
| Data Sheet | SOT23, Switched-Capacitor Voltage Inverters with Shutdown | Jun 02, 2004 |
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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