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Charge Pumps 
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MAX828
Switched-Capacitor Voltage Inverters
Inductorless Power Supply for Pager LCD
MyMaxim SubscriptionsProduct Details
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) | 0.09 |
| Switching Frequency (kHz) | 12 |
| Oper. Temp. (°C) | -40 to +85 0 to +70 |
| Package/Pins | SOT23/5 |
| Budgetary Price (See Notes) | 2.41 |
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Simplified Block Diagram
Technical Docs
How to Design a Negative Voltage Reference Using MAX828
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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) | 0.09 |
| Switching Frequency (kHz) | 12 |
| Oper. Temp. (°C) | -40 to +85 0 to +70 |
| Package/Pins | SOT23/5 |
| Budgetary Price (See Notes) | 2.41 |
Key Features
- 5-Pin SOT23-5 Package
- 95% Voltage Conversion Efficiency
- Inverts Input Supply Voltage
- 60µA Quiescent Current (MAX828)
- +1.5V to +5.5V Input Voltage Range
- Requires Only Two Capacitors
- 25mA Output Current
Applications/Uses
- Battery-Powered Applications
- Cell Phones
- Handy-Terminals, PDAs
- Medical Instruments
- Small LCD Panels
Description
The ultra-small MAX828/MAX829 monolithic, CMOS charge-pump inverters accept input voltages ranging from +1.5V to +5.5V. The MAX828 operates at 12kHz, and the MAX829 operates at 35kHz. Their high efficiency (greater than 90% over most of the load-current range) and low operating current (60µA for the MAX828) make these devices ideal for both battery-powered and board-level voltage-conversion applications.
The MAX828/MAX829 combine low quiescent current and high efficiency. Oscillator control circuitry and four power MOSFET switches are included on-chip. Applications include generating a -5V supply from a +5V logic supply to power analog circuitry. Both parts come in a 5-pin SOT23-5 package and can deliver 25mA with a voltage drop of 500mV.
For a similar device with logic-controlled shutdown, refer to the MAX1719/MAX1720/MAX1721. For applications requiring more power, the MAX860 delivers up to 50mA with a voltage drop of 600mV, in a space-saving µMAX® package.
The MAX828/MAX829 combine low quiescent current and high efficiency. Oscillator control circuitry and four power MOSFET switches are included on-chip. Applications include generating a -5V supply from a +5V logic supply to power analog circuitry. Both parts come in a 5-pin SOT23-5 package and can deliver 25mA with a voltage drop of 500mV.
For a similar device with logic-controlled shutdown, refer to the MAX1719/MAX1720/MAX1721. For applications requiring more power, the MAX860 delivers up to 50mA with a voltage drop of 600mV, in a space-saving µMAX® package.
Technical Docs
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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