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PDF TC3683 Data sheet ( Hoja de datos )

Número de pieza TC3683
Descripción (TC3682 - TC3684) Inverting Charge Pump Voltage Doublers
Fabricantes Microchip Technology 
Logotipo Microchip Technology Logotipo



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M TC3682/TC3683/TC3684
Inverting Charge Pump Voltage Doublers with Active Low Shutdown
Features
• Small 8-Pin MSOP Package
• Operates from 1.8V to 5.5V
• 120 Ohms (typ) Output Resistance
• 99% Voltage Conversion Efficiency
• Only 3 External Capacitors Required
• Power-Saving Shutdown Mode
• Low Active Supply Current
- 95µA (typ) for TC3682
- 225µA (typ) for TC3683
- 700µA (typ) for TC3684
• Fully Compatible with 1.8V Logic Systems
Applications
• LCD Panel Bias
• Cellular Phones PA Bias
• Pagers
• PDAs, Portable Data Loggers
• Battery-Powered Devices
Device Selection Table
Part
Number
www.DataSheet4TUC.c3o6m82EUA
TC3683EUA
TC3684EUA
Package
8-Pin MSOP
8-Pin MSOP
8-Pin MSOP
Osc.
Freq.
(kHz)
12
35
125
Operating
Temp.
Range
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Package Type
8-Pin MSOP
C1– 1
C2+ 2
C2– 3
VOUT 4
TC3682
TC3683
TC3684
8 SHDN
7 C1+
6 VIN
5 GND
General Description
The TC3682/TC3683/TC3684 are CMOS charge pump
converters that provide an inverted doubled output
from a single positive supply. An on-board oscillator
provides the clock and only three external capacitors
are required for full circuit implementation. Switching
frequencies are 12kHz for the TC3682, 35kHz for the
TC3683, and 125kHz for the TC3684. When the SHDN
pin is held at a logic low, the device goes into a very low
power mode of operation consuming less than 1µA
(typ) of supply current.
Low output source impedance (typically 120), pro-
vides output current up to 10mA. The TC3682/TC3683/
TC3684 feature a 1.8V to 5.5V operating voltage range
and high efficiency, which make them an ideal choice
for a wide variety of applications requiring a negative
doubled voltage derived from a single positive supply
(for example: generation of -7.2V from a +3.6V lithium
cell or -10V generated from a +5V logic supply).
The minimum external part count, small physical size
and shutdown mode feature make this family of prod-
ucts useful for a wide variety of negative bias power
supply applications.
Functional Block Diagram
+ C1+
C1
VIN
C1
SHDN
C2+ TC3682
+ TC3683
C2 C2TC3684
Input
ON
OFF
GND
VOUT
VOUT = -(2 x VIN)
COUT
+
C1 must have a voltage rating VIN
C2 and COUT must have a voltage rating 2VIN
2002 Microchip Technology Inc.
DS21556B-page 1

1 page




TC3683 pdf
TC3682/TC3683/TC3684
4.0 APPLICATIONS INFORMATION
4.1 Output Voltage Considerations
The TC3682/TC3683/TC3684 perform inverting
voltage conversions but do not provide any type of
regulation. The output voltage will droop in a linear
manner with respect to the output load current. The
value of the equivalent output resistance of the -VIN
output is approximately 50nominal at +25°C and
VIN = +5V. The value of the -2VINoutput is approxi-
mately 140nominal at +25°C and VIN = +5V. In this
particular case, -VINis approximately -5V and -2VIN
is approximately -10V at very light loads and each
stage will droop according to the equation below:
VDROOP = IOUT x ROUT
4.2 Capacitor Selection
In order to maintain the lowest output resistance and
output ripple voltage, it is recommended that low ESR
capacitors be used. Additionally, larger values of C1
and C2 will lower the output resistance and larger
values of COUT will reduce output ripple.
Note: For proper charge pump operation, C1
must have a voltage rating greater than or
equal to VIN, while C2 and COUT must have
a voltage rating greater than or equal to
2VIN.
Table 4-1 shows various values of C1/C2 and the
corresponding output resistance values for VIN = 5V
@ +25°C.
Table 4-2 shows the output voltage ripple for various
values of COUT (again assuming VIN = 5V @ +25°C).
The VRIPPLE values assume a 1mA output load current
and a 0.1ESRCOUT.
www.DataSheet4U.com
TABLE 4-1: OUTPUT RESISTANCE
VS. C1/C2 (ESR = 0.1)
C1, C2
(µF)
0.33
1
3.3
TC3682
ROUT()
633
262
120
TC3683
ROUT()
184
120
95
TC3684
ROUT()
120
102
84
TABLE 4-2:
OUTPUT VOLTAGE RIPPLE
VS. COUT (ESR = 0.1)
IOUT = 1mA
COUT
(µF)
TC3682
VRIPPLE
(mV)
TC3683
VRIPPLE
(mV)
TC3684
VRIPPLE
(mV)
0.33 192
1 63
3.3 17
60
21
8
27
16
7
4.3 Input Supply Bypassing
The VIN input should be capacitively bypassed to
reduce AC impedance and minimize noise effects due
to the switching internal to the device. It is
recommended that a large value capacitor (at least
equal to C1) be connected from VIN to GND for optimal
circuit performance.
4.4 Shutdown Input
The TC3682/TC3683/TC3684 is enabled when SHDN
is high, and disabled when SHDN is low. This input
cannot be allowed to float. (If SHDN is not required, see
the TC2682/TC2683/TC2684 data sheet.) The SHDN
input should be limited to 0.3V above VIN.
4.5 Inverting Voltage Doubler
The most common application for the TC3682/TC3683/
TC3684 devices is the inverting voltage doubler
(Figure 4-1). This application uses three external
capacitors: C1, C2 and COUT.
Note: A power supply bypass capacitor is
recommended.
The output is equal to -2VIN plus any voltage drops due
to loading. Refer to Table 4-1 and Table 4-2 for
capacitor selection guidelines.
FIGURE 4-1:
INVERTING VOLTAGE
DOUBLER TEST CIRCUIT
VIN
+
CIN
+
C1
+
C2
7 C1+
68
VIN SHDN
1 C1TC3682
2 C2+
TC3683
TC3684
-2VIN 4
3 C2
GND
COUT
+
5
RL
VOUT
Device
TC3682
TC3683
TC3684
CIN
3.3µF
1µF
0.33µF
C1
3.3µF
1µF
0.33µF
C2
3.3µF
1µF
0.33µF
COUT
3.3µF
1µF
0.33µF
4.6 Layout Considerations
As with any switching power supply circuit, good layout
practice is recommended. Mount components as close
together as possible to minimize stray inductance and
capacitance. Also use a large ground plane to minimize
noise leakage into other circuitry.
2002 Microchip Technology Inc.
DS21556B-page 5

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