TC2682/TC2683/TC2684
M
Inverting Charge Pump Voltage Doublers
Features
General Description
• 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 TC2682
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 120Ω),
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).
- 225µA (typ) for TC2683
- 700µA (typ) for TC2684
Applications
• LCD Panel Bias
• Cellular Phones PA Bias
• Pagers
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.
• PDAs, Portable Data Loggers
• Battery-Powered Devices
Functional Block Diagram
Device Selection Table
Osc.
Freq.
(kHz)
Operating
Temp.
Range
C1+
V
+
C1
IN
Input
Part
Number
Package
C1–
TC2682EUA 8-Pin MSOP
TC2683EUA 8-Pin MSOP
12
35
-40°C to +85°C
-40°C to +85°C
C2+ TC2682
+
C2
TC2683
TC2684
TC2684EUA 8-Pin MSOP 125 -40°C to +85°C
C2–
V
= -(2 x V )
IN
OUT
GND
Package Type
V
OUT
–
C
OUT
8-Pin MSOP
+
1
2
3
4
8
7
6
5
NC
C1 must have a voltage rating ≥ V
IN
must have a voltage rating ≥ 2V
C2+
OUT
C1+
TC2682
TC2683
TC2684
C2 and C
OUT
IN
V
IN
V
GND
2002 Microchip Technology Inc.
DS21548B-page 1