ICL7660S Intersil Corporation, ICL7660S Datasheet
ICL7660S
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ICL7660S Summary of contents
Page 1
... ICL7660 offering an extended operating supply voltage range up to 12V, with lower supply current. No external diode is needed for the ICL7660S. In addition, a Frequency Boost pin has been incorporated to enable the user to achieve lower output impedance despite using smaller capacitors. All improvements are highlighted in the Electrical Specifications section ...
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... ICL7660SM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 ICL7660SI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 ICL7660SC CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. ...
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... In the test circuit, there is no external capacitor applied to pin 7. However, when the device is plugged into a test socket, there is usually a very small but finite stray capacitance present, of the order of 5pF. 5. The Intersil ICL7660S can operate without an external diode over the full temperature and voltage range. This device will function in existing designs which incorporate an external diode with no degradation in overall circuit performance. ...
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... FIGURE 7. OUTPUT VOLTAGE AS A FUNCTION OF OUTPUT CURRENT LOAD CURRENT (mA) FIGURE 9. OUTPUT VOLTAGE AS A FUNCTION OF OUTPUT CURRENT 3-39 ICL7660S (Test Circuit Figure 12) (Continued -55 100 1k FIGURE 6. UNLOADED OSCILLATOR FREQUENCY AS A 100 ...
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... FIGURE 11. OUTPUT SOURCE RESISTANCE AS A FUNCTION OF OSCILLATOR FREQUENCY NOTE: 7. These curves include in the supply current that current fed directly into the load R supply current goes directly to the positive side of the load, and the other half, through the ICL7660S, to the negative side of the load. Ideally ...
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... Do not short circuit the output to V voltages above 5.5V for extended periods, however, tran- sient conditions including start-up are okay. 4. When using polarized capacitors, the + terminal of C must be connected to pin 2 of the ICL7660S and the + terminal of C must be connected to GND the voltage supply driving the ICL7660S has a large source impedance ( then a 2 ...
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... OUT R = OUT n (number of devices) Cascading Devices The ICL7660S may be cascaded as shown to produce larger negative multiplication of the initial supply voltage. However, due to the finite efficiency of each device, the practical limit is 10 devices for light loads. The output voltage is defined by -n(V ), ...
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... R Regulated Negative Voltage Supply In Some cases, the output impedance of the ICL7660S can be a problem, particularly if the load current varies substantially. The circuit of Figure 23 can be used to overcome this by controlling the input voltage, via an 1 ICL7611 low-power CMOS op amp, in such a way as to maintain a nearly constant output voltage. Direct feedback is inadvisable, since the ICL7660S’ ...
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... NORTH AMERICA Intersil Corporation P. O. Box 883, Mail Stop 53-204 Melbourne, FL 32902 TEL: (407) 724-7000 FAX: (407) 724-7240 3-44 ICL7660S Further information on the operation and use of the ICL7660S may be found in AN051 “Principles and Applications of the ICL7660 CMOS Voltage Converter” ...