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  Microchip Technology Semiconductor Electronic Components Datasheet  

TC168x Datasheet

Inverting Charge Pump Voltage Doublers with Active High Shutdown

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TC168x pdf
M TC1682/TC1683/TC1684
Inverting Charge Pump Voltage Doublers with Active High Shutdown
Features
• 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 TC1682
- 225µA (typ) for TC1683
- 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
Device Selection Table
Part
Number
TC1682EUA
TC1683EUA
TC1684EUA
Package
8-Pin MSOP
8-Pin MSOP
8-Pin MSOP
Osc.
Freq.
(kHz)
Operating
Temp.
Range
12 -40°C to +85°C
35 -40°C to +85°C
125 -40°C to +85°C
Package Type
8-Pin MSOP
C1– 1
C2+ 2
C2– 3
VOUT 4
TC1682
TC1683
TC1684
8 SHDN
7 C1+
6 VIN
5 GND
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 1µA
(typ) of supply current.
Low output source impedance (typically 120),
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.
Functional Block Diagram
+ C1+
C1
VIN
C1
SHDN
C2+ TC1682
+ TC1683
C2 C2TC1684
Input
OFF
ON
GND
VOUT
VOUT = -(2 x VIN)
COUT
+
C1 must have a voltage rating VIN
C2 and COUT must have a voltage rating 2VIN
2002 Microchip Technology Inc.
DS21537B-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

TC168x Datasheet

Inverting Charge Pump Voltage Doublers with Active High Shutdown

No Preview Available !

TC168x pdf
TC1682/TC1683/TC1684
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Input Voltage (VIN to GND)....................... +6.0V, -0.3V
Output Voltage (VOUT to GND)............... -12.0V, +0.3V
Current at VOUT Pin.............................................20mA
Short-Circuit Duration VOUT to GND ..............Indefinite
Power Dissipation (TA 70°C)
8-Pin MSOP .............................................320mW
Operating Temperature Range.............-40°C to +85°C
Storage Temperature (Unbiased) .......-65°C to +150°C
*Stresses above those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device. These
are stress ratings only and functional operation of the device
at these or any other conditions above those indicated in the
operation sections of the specifications is not implied.
Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability.
TC1682/TC1683/TC1684 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: TA = -40°C to +85°C, VIN = +5V, C1 = C2 = 3.3µF (TC1682), C1 = C2 = 1µF (TC1683),
C1 = C2 = 0.33µF (TC1684), SHDN = GND, Typical values are at TA = +25°C
Symbol
Parameter
Min Typ Max Units Device
Test Conditions
IDD Supply Current
95 160 µA TC1682
225 480
TC1683
700 1500
TC1684
ISHDN Shutdown Supply Current
0.5
2
µA All
SHDN = VIN = +5V
VMIN
Minimum Supply Voltage
1.8
V All
RLOAD = 1k
VMAX
Maximum Supply Voltage
— — 5.5
V All
RLOAD = 1k
FOSC
Oscillator Frequency
8.4 12
24.5 35
65 125
15.6
45.5
170
kHz TC1682
TC1683
TC1684
VIH SHDN Input Logic High
1.4
V All
VIN = VMIN to VMAX
VIL SHDN Input Logic Low
— — 0.4
V All
VIN = VMIN to VMAX
VEFF
Voltage Conversion Efficiency
95 99
% All
RLOAD =
ROUT
Output Resistance
120 170
All
ILOAD = 0.5mA to 10mA (Note 1)
TWK
Wake-up Time From Shutdown Mode
1800
600
µsec TC1682 RLOAD = 2k
TC1683
200
TC1684
Note 1: Capacitor contribution is approximately 20% of the output impedance (ESR = 1/ pump frequency x capacitance).
DS21537B-page 2
2002 Microchip Technology Inc.


Part Number TC168x
Description Inverting Charge Pump Voltage Doublers with Active High Shutdown
Maker Microchip Technology
Total Page 10 Pages
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