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TC7660EOATR Datasheet(PDF) 5 Page - Microchip Technology |
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TC7660EOATR Datasheet(HTML) 5 Page - Microchip Technology |
5 / 18 page © 2005 Microchip Technology Inc. DS21486C-page 5 TCM680 3.0 PIN DESCRIPTION The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE 3.1 First Charge Pump Capacitor (C1 -) Negative connection for the charge pump capacitor (flying capacitor) used to transfer charge from the input source to a second charge pump capacitor. This charge pump capacitor is used to double the input volt- age and store the charge in the second charge pump capacitor. It is recommended that a low ESR (equivalent series resistance) capacitor be used. Additionally, larger values will lower the output resistance. 3.2 Second Charge Pump Capacitor (C2 +) Positive connection for the second charge pump capacitor (flying capacitor) used to transfer charge from the first charge pump capacitor to the output. It is recommended that a low ESR (equivalent series resistance) capacitor be used. Additionally, larger values will lower the output resistance. 3.3 Second Charge Pump Capacitor (C2 -) Negative connection for the second charge pump capacitor (flying capacitor) used to transfer charge from the first charge pump capacitor to the output. Proper orientation is imperative when using a polarized capacitor. 3.4 Negative Output Voltage (VOUT -) Negative connection for the negative charge pump out- put capacitor. The negative charge pump output capac- itor supplies the output load during the first, third and fourth phases of the switching cycle. During the second phase of the switching cycle, charge is restored to the negative charge pump output capacitor. The negative output voltage magnitude is approximately twice the input voltage. It is recommended that a low ESR (equivalent series resistance) capacitor be used. Additionally, larger values will lower the output ripple. 3.5 Ground (GND) Input zero volt reference. 3.6 Power Supply Input (VIN) Positive power supply input voltage connection. It is recommended that a low ESR (equivalent series resis- tance) capacitor be used to bypass the power supply input to ground (GND). 3.7 First Charge Pump Capacitor (C1 +) Positive connection for the charge pump capacitor (fly- ing capacitor) used to transfer charge from the input source to a second charge pump capacitor. Proper orientation is imperative when using a polarized capacitor. 3.8 Positive Output Voltage (VOUT +) Positive connection for the positive charge pump out- put capacitor. The positive charge pump output capac- itor supplies the output load during the first, second and third phases of the switching cycle. During the fourth phase of the switching cycle, charge is restored to the positive charge pump output capacitor. The positive output voltage magnitude is approximately twice the input voltage. It is recommended that a low ESR (equivalent series resistance) capacitor be used. Additionally, larger values will lower the output ripple. Pin No. (8-Pin PDIP, SOIC) Symbol Description 1C1 - Input. First charge pump capacitor. Negative connection 2C2 + Input. Second charge pump capacitor. Positive connection. 3C2 - Input. Second charge pump capacitor. Negative connection. 4VOUT - Output. Negative Output voltage 5 GND Input. Ground connection. 6VIN Input. Power supply. 7C1 + Input. First charge pump capacitor. Positive connection. 8VOUT + Output. Positive Output Voltage. |
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