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TC3682EUA датащи(PDF) 4 Page - Microchip Technology

номер детали TC3682EUA
подробное описание детали  Inverting Charge Pump Voltage Doublers with Active Low Shutdown
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
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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


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