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TC2682/TC2683/TC2684
General Description
The TC2682/TC2683/TC2684 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 TC2682, 35kHz for the
TC2683, and 125kHz for the TC2684.
Low output source impedance (typically 120鈩?,
provides output current up to 10mA. The TC2682/
TC2683/TC2684 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 and small physical
size make this family of products useful for a wide
variety of negative bias power supply applications.
Inverting Charge Pump Voltage Doublers
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 TC2682
- 225碌A(chǔ) (typ) for TC2683
- 700碌A(chǔ) (typ) for TC2684
Applications
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LCD Panel Bias
Cellular Phones PA Bias
Pagers
PDAs, Portable Data Loggers
Battery-Powered Devices
Device Selection Table
Part
Number
TC2682EUA
TC2683EUA
TC2684EUA
Package
8-Pin MSOP
8-Pin MSOP
8-Pin MSOP
Osc.
Freq.
(kHz)
12
35
125
Operating
Temp.
Range
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
Functional Block Diagram
+
C1
C1+
C1鈥?/div>
C2+
+
C2
C2鈥?/div>
GND
V
OUT
V
IN
Input
TC2682
TC2683
TC2684
V
OUT
= -(2 x V
IN
)
鈥?C
OUT
+
Package Type
8-Pin MSOP
C1鈥?/div>
C2+
C2鈥?/div>
V
OUT
1
2
3
4
8
NC
C1+
V
IN
GND
TC2682
TC2683
TC2684
7
6
5
C1 must have a voltage rating
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VIN
C2 and C
OUT
must have a voltage rating
鈮?/div>
2V
IN
錚?/div>
2002 Microchip Technology Inc.
DS21548B-page 1
TC2682EUA相關(guān)型號(hào)PDF文件下載
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