TC1682/TC1683/TC1684
M
Inverting Charge Pump Voltage Doublers with Active High Shutdown
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
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 1µA
(typ) of supply current.
- 95µA (typ) for TC1682
- 225µA (typ) for TC1683
Low output source impedance (typically 120Ω),
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).
- 700µA (typ) for TC1684
• Fully Compatible with 1.8V Logic Systems
Applications
• LCD Panel Bias
• Cellular Phones PA Bias
• Pagers
• PDAs, Portable Data Loggers
• Battery-Powered Devices
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.
Device Selection Table
Osc.
Freq.
(kHz)
Operating
Temp.
Range
Part
Number
Functional Block Diagram
Package
C1+
V
+
IN
Input
OFF
TC1682EUA 8-Pin MSOP
TC1683EUA 8-Pin MSOP
TC1684EUA 8-Pin MSOP
12
35
-40°C to +85°C
-40°C to +85°C
C1
C1–
SHDN
ON
125 -40°C to +85°C
C2+ TC1682
+
C2
TC1683
Package Type
TC1684
C2–
8-Pin MSOP
V
= -(2 x V )
IN
OUT
GND
V
OUT
–
1
2
3
4
8
7
6
5
SHDN
C
OUT
+
C2+
OUT
C1+
TC1682
TC1683
TC1684
V
IN
C1 must have a voltage rating ≥ V
IN
C2 and C
must have a voltage rating ≥ 2V
OUT
IN
V
GND
2002 Microchip Technology Inc.
DS21537B-page 1