鈥?/div>
TC3682/TC3683/TC3684
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 1碌A(chǔ)
(typ) of supply current.
Low output source impedance (typically 120鈩?, 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.
Operating
Temp.
Range
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
+
C2
C2鈥?/div>
Inverting Charge Pump Voltage Doublers with Active Low Shutdown
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
- 95碌A(chǔ) (typ) for TC3682
- 225碌A(chǔ) (typ) for TC3683
- 700碌A(chǔ) (typ) for TC3684
鈥?Fully Compatible with 1.8V Logic Systems
Applications
鈥?/div>
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鈥?/div>
鈥?/div>
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LCD Panel Bias
Cellular Phones PA Bias
Pagers
PDAs, Portable Data Loggers
Battery-Powered Devices
Device Selection Table
Part
Number
Package
Osc.
Freq.
(kHz)
12
35
125
Functional Block Diagram
+
C1
C1+
C1鈥?/div>
C2+
V
IN
SHDN
Input
ON
OFF
TC3682EUA 8-Pin MSOP
TC3683EUA 8-Pin MSOP
TC3684EUA 8-Pin MSOP
Package Type
8-Pin MSOP
C1鈥?/div>
C2+
C2鈥?/div>
V
OUT
1
2
3
4
8
SHDN
C1+
V
IN
GND
TC3682
TC3683
TC3684
V
OUT
GND
V
OUT
= -(2 x V
IN
)
鈥?C
OUT
+
TC3682
TC3683
TC3684
7
6
5
C1 must have a voltage rating
鈮?/div>
V
IN
C2 and C
OUT
must have a voltage rating
鈮?/div>
2V
IN
錚?/div>
2002 Microchip Technology Inc.
DS21556B-page 1
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