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MAX680 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX680 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 8 page ________________General Description The MAX680/MAX681 are monolithic, CMOS, dual charge-pump voltage converters that provide ±10V out- puts from a +5V input voltage. The MAX680/MAX681 pro- vide both a positive step-up charge pump to develop +10V from +5V input and an inverting charge pump to generate the -10V output. Both parts have an on-chip, 8kHz oscillator. The MAX681 has the capacitors internal to the package, and the MAX680 requires four external capacitors to produce both positive and negative voltages from a single supply. The output source impedances are typically 150 Ω, pro- viding useful output currents up to 10mA. The low quies- cent current and high efficiency make this device suitable for a variety of applications that need both positive and negative voltages generated from a single supply. The MAX864/MAX865 are also recommended for new designs. The MAX864 operates at up to 200kHz and uses smaller capacitors. The MAX865 comes in the smaller µMAX package. ________________________Applications The MAX680/MAX681 can be used wherever a single positive supply is available and where positive and nega- tive voltages are required. Common applications include generating ±6V from a 3V battery and generating ±10V from the standard +5V logic supply (for use with analog circuitry). Typical applications include: ____________________________Features o 95% Voltage-Conversion Efficiency o 85% Power-Conversion Efficiency o +2V to +6V Voltage Range o Only Four External Capacitors Required (MAX680) o No Capacitors Required (MAX681) o 500µA Supply Current o Monolithic CMOS Design +5V to ±10V Voltage Converters ________________________________________________________________ Maxim Integrated Products 1 VCC C2- GND V- 1 2 8 7 V+ C1+ C2+ C1- MAX680 DIP/SO TOP VIEW 3 4 6 5 14 13 12 11 10 9 8 1 2 3 4 5 6 7 VCC VCC VCC VCC C2+ C1- C1- V+ MAX681 V+ GND GND V- C2- C2- DIP _________Typical Operating Circuits MAX680 +10V 4.7 µF 4.7 µF 4.7 µF 4.7 µF -10V GND +10V -10V GND FOUR PINS REQUIRED (MAX681 ONLY) +5V GND GND +5V C1- C1+ V- V+ C2- VCC GND +5V to ±10V CONVERTER MAX681 V- V+ VCC GND C1+ _________________Pin Configurations 19-0896; Rev 1; 7/96 PART MAX680CPA MAX680CSA MAX680C/D 0°C to +70°C 0°C to +70°C 0°C to +70°C TEMP. RANGE PIN-PACKAGE 8 Plastic DIP 8 Narrow SO Dice _______________Ordering Information For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 MAX680EPA MAX680ESA -40°C to +85°C -40°C to +85°C 8 Plastic DIP 8 Narrow SO MAX680MJA -55°C to +125°C 8 CERDIP MAX681CPD MAX681EPD -40°C to +85°C 0°C to +70°C 14 Plastic DIP 14 Plastic DIP ±6V from 3V Lithium Cell Hand-Held Instruments Data-Acquisition Systems Panel Meters ±10V from +5V Logic Supply Battery-Operated Equipment Operational Amplifier Power Supplies |
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