鈥?/div>
TC1682/TC1683/TC1684
General Description
The TC1682/TC1683/TC1684 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 TC1682, 35kHz for the
TC1683, and 125kHz for the TC1684. When the SHDN
pin is held at a logic high, the device goes into a very
low power mode of operation consuming less than 1碌A
(typ) of supply current.
Low output source impedance (typically 120鈩?,
provides output current up to 10mA. The TC1682/
TC1683/TC1684 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
products useful for a wide variety of negative bias
power supply applications.
Operating
Temp.
Range
-40掳C to +85掳C
-40掳C to +85掳C
-40掳C to +85掳C
+
C2
C2鈥?/div>
Inverting Charge Pump Voltage Doublers with Active High 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 (typ) for TC1682
- 225碌A (typ) for TC1683
- 700碌A (typ) for TC1684
鈥?Fully Compatible with 1.8V Logic Systems
Applications
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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
TC1682EUA
TC1683EUA
TC1684EUA
Package
8-Pin MSOP
8-Pin MSOP
8-Pin MSOP
Osc.
Freq.
(kHz)
12
35
125
Functional Block Diagram
+
C1
C1+
C1鈥?/div>
C2+
V
IN
SHDN
Input
OFF
ON
Package Type
8-Pin MSOP
C1鈥?/div>
C2+
C2鈥?/div>
V
OUT
1
2
3
4
8
SHDN
C1+
V
IN
GND
TC1682
TC1683
TC1684
V
OUT
GND
V
OUT
= -(2 x V
IN
)
鈥?C
OUT
+
TC1682
TC1683
TC1684
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
铮?/div>
2002 Microchip Technology Inc.
DS21537B-page 1
TC1682 PDF文件相关型号
TC1683,TC1684,TC170
TC1682相关型号PDF文件下载
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