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TC2683EUA Datasheet(PDF) 4 Page - Microchip Technology |
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TC2683EUA Datasheet(HTML) 4 Page - Microchip Technology |
4 / 10 page TC2682/TC2683/TC2684 DS21548B-page 4 2002 Microchip Technology Inc. 3.0 DETAILED DESCRIPTION The TC2682/TC2683/TC2684 inverting charge pumps perform a -2x multiplication of the voltage applied to the VIN pin. Conversion is performed using two synchronous switching matrices and three external capacitors. Figure 3-1 is a block diagram representation of the TC2682/TC2683/TC2684 architecture. The first switch- ing stage inverts the voltage present at VIN and the second stage uses the ‘-VIN’ output generated from the first stage to produce the ‘-2X’ output function from the second stage switching matrix. Each device contains an on-board oscillator that synchronously controls the operation of the charge pump switching matrices. The TC2682 synchronously switches at 12kHz, the TC2683 synchronously switches at 35kHz, and the TC2684 synchronously switches at 125kHz. The different oscillator frequencies for this device family allow the user to trade-off capacitor size versus supply current. Faster oscillators can use smaller external capacitors, but will consume more supply current (see Section 1.0 Electrical Characteristics). FIGURE 3-1: TC2682/TC2683/TC2684 ARCHITECTURE VOUT = -2VIN -VIN + COUT VIN Switch Matrix (1st Stage) Switch Matrix (2nd Stage) Oscillator C1 + C2 + |
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