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GS7660IP Datasheet(PDF) 5 Page - Vishay Siliconix |
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GS7660IP Datasheet(HTML) 5 Page - Vishay Siliconix |
5 / 9 page GS7660 Vishay formerly General Semiconductor Document Number 74819 www.vishay.com 24-May-02 5 Pin Description Pin Name Function BOOST Frequency Boost. Connecting BOOST to VIN increases the oscillator frequency by a factor of five. 1 When the oscillator is driven externally, BOOST has no effect and should be left open. N.C. No Connection 2 CAP+ Connection to positive terminal of Charge-Pump Capacitor 3 GND Ground. For most applications, the positive terminal of the reservoir capacitor is connected to this pin. 4 CAP– Connection to negative terminal of Charge-Pump Capacitor 5VOUT Negative Voltage Output. For most applications, the negative terminal of the reservoir capacitor is connected to this pin. 6 LV Low-Voltage Operation. Connect to ground for supply voltages below 3.5V. 7 OSC Oscillator Control Input. Connecting an external capacitor reduces the oscillator frequency. 8VIN Power Supply Positive Voltage Input. (1.5V to 6V). VIN is also the substrate connection. Detailed Description The GS7660 is a charge-pump voltage converter. The basic operations is as follows: Switch pairs S1, S2 and S3, S4 (Fig.7) are alternately closed and opened at the rate of the oscillator frequency divided by two. During the first half of the cycle, when S1 and S2 are closed and S3 and S4 are open, bucket capacitor C1 is charged by input voltage. During the second half of the cycle, when the switches assume the opposite state, capacitor C1 is connected in parallel with output capacitor C2 and any voltage differential causes a transfer of charge from C1 to C2. This process will continue until the voltage across C2 equals the –VIN voltage. In normal operation, the output voltage will be less than –VIN, since the switches have internal resistance and C2 is being discharged by the load. S1 VIN S2 S3 S4 C1 C2 VOUT = -(VIN) Fig. 7 – Ideal Voltage Inverter |
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