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ICL7660CPA Datasheet(PDF) 10 Page - Maxim Integrated Products |
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ICL7660CPA Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 12 page Positive Voltage Doubler Figure 9 illustrates the recommended voltage doubler circuit for the MAX1044/ICL7660. To reduce the voltage drops contributed by the diodes (VD), use Schottky diodes. For true voltage doubling or higher output cur- rents, use the MAX660. Voltage Divider The voltage divider shown in Figure 10 splits the power supply in half. A third capacitor can be added between V+ and VOUT. Combined Positive Multiplication and Negative Voltage Conversion Figure 11 illustrates this dual-function circuit. Capacitors C1 and C3 perform the bucket and reser- voir functions for generating the negative voltage. Capacitors C2 and C4 are the bucket and reservoir capacitors for the doubled positive voltage. This circuit has higher output impedances resulting from the use of a common charge-pump driver. Cascading Devices Larger negative multiples of the supply voltage can be obtained by cascading MAX1044/ICL7660 devices (Figure 12). The output voltage is nominally VOUT = -n(V+) where n is the number of devices cascaded. The out- put voltage is reduced slightly by the output resistance of the first device, multiplied by the quiescent current of the second, etc. Three or more devices can be cascaded in this way, but output impedance rises dramatically. For example, the output resistance of two cascaded MAX1044s is approximately five times the output resis- tance of a single voltage converter. A better solution may be an inductive switching regulator, such as the MAX755, MAX759, MAX764, or MAX774. Switched-Capacitor Voltage Converters 10 ______________________________________________________________________________________ MAX1044 ICL7660 4 3 2 1 5 6 7 8 C2 10µF C1 10µF V+ VOUT = V+ 1 2 LV Figure 10. Voltage Divider MAX1044 ICL7660 4 3 VOUT = 2(V+) - 2VD 2 1 5 6 7 8 C4 C1 C2 V+ VOUT = -(V+) C3 LV Figure 11. Combined Positive and Negative Converter MAX1044 ICL7660 4 3 2 1 5 6 7 8 MAX1044 ICL7660 4 3 2 1 5 6 7 8 10µF 10µF V+ 10µF 10µF 10µF VOUT = -n(V+) 10µF MAX1044 ICL7660 4 3 2 1 5 6 7 8 12 3 Figure 12. Cascading MAX1044/ICL7660 for Increased Output Voltage |
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