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TC3684EUA 数据表(PDF) 4 Page - Microchip Technology |
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TC3684EUA 数据表(HTML) 4 Page - Microchip Technology |
4 / 10 page TC3682/TC3683/TC3684 DS21556B-page 4 2002 Microchip Technology Inc. 3.0 DETAILED DESCRIPTION The TC3682/TC3683/TC3684 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. When the shutdown input is held at a logic low, 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 TC3682/TC3683/TC3684 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 TC3682 synchronously switches at 12kHz, the TC3683 synchronously switches at 35kHz, and the TC3684 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 low state, the oscillator and both switch matrices are powered off placing the TC3682/TC3683/TC3684 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: TC3682/TC3683/TC3684 ARCHITECTURE SHDN ENABLE ENABLE ENABLE -2VIN -VIN + COUT2 VIN Switch Matrix (1st Stage) Switch Matrix (2nd Stage) Oscillator C1 + C2 + + COUT1 |
类似零件编号 - TC3684EUA |
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类似说明 - TC3684EUA |
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