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TC1682_05 Datenblatt(Datasheet) 4 Page - Microchip Technology

Teile-Nr. TC1682_05
Beschreibung  Inverting Charge Pump Voltage Doublers with Active High Shutdown
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Hersteller  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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TC1682/TC1683/TC1684
DS21537C-page 4
© 2005 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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