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ICL7660EPA Datasheet(PDF) 6 Page - Maxim Integrated Products |
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ICL7660EPA Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page current is: I = f x ∆Q = f x C1(V+ - V OUT). Rewriting this equation in Ohm’s law form defines an equivalent resis- tance synthesized by the switched-capacitor circuit where: where f is one-half the oscillator frequency. This resis- tance is a major component of the output impedance of switched-capacitor circuits like the MAX1044/ICL7660. As shown in Figure 4, the MAX1044/ICL7660 contain MOSFET switches, the necessary transistor drive cir- cuitry, and a timing oscillator. ________________Design Information The MAX1044/ICL7660 are designed to provide a simple, compact, low-cost solution where negative or doubled supply voltages are needed for a few low- power components. Figure 5 shows the basic negative voltage converter circuit. For many applications, only two external capacitors are needed. The type of capacitor used is not critical. Proper Use of the Low-Voltage (LV) Pin Figure 4 shows an internal voltage regulator inside the MAX1044/ICL7660. Use the LV pin to bypass this regulator, in order to improve low-voltage performance I (V+ - V ) 1 / (f x C1) R 1 f x C1 OUT EQUIV = = and Switched-Capacitor Voltage Converters 6 _______________________________________________________________________________________ S1 V+ S2 S3 S4 C1 C2 VOUT = -(V+) Figure 2. Ideal Voltage Inverter V+ C1 f C2 RLOAD VOUT Figure 3a. Switched Capacitor Model REQUIV = REQUIV VOUT RLOAD 1 V+ f × C1 C2 Figure 3b. Equivalent Circuit 1M BOOST pin 1 OSC pin 7 LV pin 6 GND pin 3 CAP- pin 4 S2 S1 S4 S3 CAP+ pin 2 V+ pin 8 VOUT pin 5 ÷ 2 Q Q Figure 4. MAX1044 and ICL7660 Functional Diagram |
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