MAX860
50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
Inductorless Inverter/Positive Doubler Switches Up to 250kHz
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Key Features
Applications/Uses
| Topology | Doubler Inverter Unregulated |
| VIN (V) (min) | 1.5 |
| VIN (V) (max) | 5.5 |
| IOUT (A) (typ) | 0.05 |
| Unadj. VOUT (V) | +2xVIN -VIN |
| IQ (mA) (max) | 0.3 |
| Switching Frequency (kHz) | 130 |
| Oper. Temp. (°C) | -55 to +125 -40 to +85 0 to +70 |
| Package/Pins | SOIC (N)/8 UMAX/8 |
| Budgetary Price (See Notes) | 1.3 |
Simplified Block Diagram
Technical Docs
| Data Sheet | 50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters | Aug 20, 2013 | |
| App Note | Two AA Cells Power Dual-Supply µP | ||
| Tutorial | Guide to Integrated Charge Pump DC-DC Conversion | Maxim Integrated |
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
| Topology | Doubler Inverter Unregulated |
| VIN (V) (min) | 1.5 |
| VIN (V) (max) | 5.5 |
| IOUT (A) (typ) | 0.05 |
| Unadj. VOUT (V) | +2xVIN -VIN |
| IQ (mA) (max) | 0.3 |
| Switching Frequency (kHz) | 130 |
| Oper. Temp. (°C) | -55 to +125 -40 to +85 0 to +70 |
| Package/Pins | SOIC (N)/8 UMAX/8 |
| Budgetary Price (See Notes) | 1.3 |
Key Features
- 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
Applications/Uses
- Handheld Instruments (PDAs, Palmtops)
- Interface Power Supplies
- Medical Instruments
- Operational Amplifier Power Supplies
- Portable Computing
Description
The MAX860/MAX861 charge-pump voltage converters invert input voltages ranging from +1.5V to +5.5V, or double input voltages ranging from +2.5V to +5.5V. Because of their high switching frequencies, these devices use only two small, low-cost capacitors. Their 50mA output makes switching regulators unnecessary, eliminating inductors and their associated cost, size, and EMI. Greater than 90% efficiency over most of the load-current range, combined with a typical operating current of only 200µA (MAX860), provides ideal performance for both battery-powered and board-level voltage-conversion applications.
A frequency-control (FC) pin provides three switching-frequencies to optimize capacitor size and quiescent current and to prevent interference with sensitive circuitry. Each device has a unique set of three available frequencies. A shutdown (active-low SHDN) pin reduces current consumption to less than 1µA. The MAX860/MAX861 are suitable for use in applications where the ICL7660 and MAX660's switching frequencies are too low. The MAX860/MAX861 are available in 8-pin µMAX® and SO packages.
Technical Docs
| Data Sheet | 50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters | Aug 20, 2013 | |
| App Note | Two AA Cells Power Dual-Supply µP | ||
| Tutorial | Guide to Integrated Charge Pump DC-DC Conversion | Maxim Integrated |
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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