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TC7660SMJA Datasheet(PDF) 4 Page - Microchip Technology |
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TC7660SMJA Datasheet(HTML) 4 Page - Microchip Technology |
4 / 11 page 4 TC7660S SUPER CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER TC7660S-14 9/16/96 © 2001 Microchip Technology Inc. DS21467A The output characteristics of the circuit in Figure 3 are those of a nearly ideal voltage source in series with 70 Ω. Thus, for a load current of –10mA and a supply voltage of +5V, the output voltage would be – 4.3V. The dynamic output impedance of the TC7660S is due, primarily, to capacitive reactance of the charge transfer capacitor (C1). Since this capacitor is connected to the output for only 1/2 of the cycle, the equation is: Paralleling Devices Any number of TC7660S voltage converters may be paralleled to reduce output resistance (Figure 4). The reser- voir capacitor, C2, serves all devices, while each device requires its own pump capacitor, C1. The resultant output resistance would be approximately: XC = = 3.18 Ω, where f = 10kHz and C1 = 10µF. Figure 4. Paralleling Devices Lowers Output Impedance Dos and Don'ts • Do not exceed maximum supply voltages. • Do not connect the LV terminal to GND for supply voltages greater than 3.5V. • Do not short circuit the output to V + supply for voltages above 5.5V for extended periods; however, transient conditions including start-up are okay. • When using polarized capacitors in the inverting mode, the + terminal of C1 must be connected to pin 2 of the TC7660S and the + terminal of C2 must be connected to GND. Simple Negative Voltage Converter Figure 3 shows typical connections to provide a nega- tive supply where a positive supply is available. A similar scheme may be employed for supply voltages anywhere in the operating range of +1.5V to +12V, keeping in mind that pin 6 (LV) is tied to the supply negative (GND) only for supply voltages below 3.5V. Figure 3. Simple Negative Converter 1 2 3 4 8 7 6 5 TC7660S V + 1 2 3 4 8 7 6 5 TC7660S C1 RL C2 C1 "n" "1" + 1 2 3 4 8 7 6 5 TC7660S 10 µF + V + 10 µF + VOUT* NOTES: * C1 C2 2 2 πf C1 ROUT (of TC7660S) n (number of devices) ROUT = |
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