MAX680 Maxim Integrated Products, MAX680 Datasheet
MAX680
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MAX680 Summary of contents
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... 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 ...
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Voltage Converters ABSOLUTE MAXIMUM RATINGS V ................................................................................... +6. ...................................................................................... +12V V- ..........................................................................................-12V V- Short-Circuit Duration ...........................................Continuous V+ Current ..........................................................................75mA ∆V/∆T ..........................................................................1V/µ Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage ...
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... A OUTPUT RESISTANCE vs. SUPPLY VOLTAGE 250 C1- 200 R + OUT 150 100 R - OUT 50 0 2.0 3.0 4.0 5.0 V (V) OUTPUT VOLTAGE vs. OUTPUT CURRENT (FROM V+ TO V-) 10 MAX680, MAX681 C1– OUTPUT CURRENT (mA) _______________________________________________________________________________________ +5V to ±10V Voltage Converters OUTPUT VOLTAGE vs. LOAD CURRENT ...
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... Description The MAX681 contains all circuitry needed to implement a dual charge pump. The MAX680 needs only four capacitors. These may be inexpensive electrolytic capacitors with values in the 1µF to 100µF range. The MAX681 contains two 1.5µF capacitors as C1 and C2, and two 2.2µ ...
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... Minimal power is consumed by the drive circuitry • The impedances of the reservoir and pump capaci- tors are negligible For the MAX680/MAX681, the energy loss per clock cycle is the sum of the energy loss in the positive and negative converters as below: LOSS ...
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... GND Figure 4. Paralleling MAX680s For Lower Source Resistance The MAX680/MAX681 are not voltage regulators: the output source resistance of either charge pump is approximately 150Ω at room temperature with V 5V. Under light load with an input V approach +10V and V- will be at -10V. However both, ...
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... MAX663, and MAX664 is less than 500µA, while the out- put current capability is 5mA. The MAX680/MAX681 input can vary from without affecting regulation appreciably. With higher input voltage, more current can be drawn from the MAX680/MAX681 outputs. With 10mA can be drawn from both regulated outputs CC simultaneously. Assuming 150Ω ...
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... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1989 Maxim Integrated Products ...