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TC1683EUA Datasheet(PDF) 4 Page - Microchip Technology |
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TC1683EUA Datasheet(HTML) 4 Page - Microchip Technology |
4 / 10 page TC1682/TC1683/TC1684 DS21537B-page 4 2002 Microchip Technology Inc. 3.0 DETAILED DESCRIPTION The TC1682/TC1683/TC1684 inverting charge pump converters perform a -2x multiplication of the voltage applied to the VIN pin. Conversion is performed using two synchronous switching matrices and three external capacitors. When the shutdown input is held at a logic high, the device goes into a very low power mode of operation consuming less than 1 µA of supply current. Figure 3-1 is a block diagram representation of the TC1682/TC1683/TC1684 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 TC1682 synchronously switches at 12kHz, the TC1683 synchronously switches at 35kHz, and the TC1684 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). When the shutdown input is in a high state, the oscillator and both switch matrices are powered off placing the TC1682/TC1683/TC1684 in the shutdown mode. When the VIN supply input is powered from an external battery, the shutdown mode minimizes power consumption, which in turn will extend the life of the battery. FIGURE 3-1: TC1682/TC1683/TC1684 ARCHITECTURE SHDN ENABLE ENABLE ENABLE VOUT = -2VIN -VIN + COUT VIN Switch Matrix (1st Stage) Switch Matrix (2nd Stage) Oscillator C1 + C2 + |
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