TC1227 반도체 회로 부품 판매점
(TC1225 / TC1226 / TC1227) Inverting Dual Charge Pump Voltage Converters
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 Microchip Technology |
TC1225
TC1226
TC1227
Inverting Dual (–VIN, –2VIN) Charge Pump Voltage Converters
FEATURES
s Small 8-Pin MSOP Package
s Operates from 1.8V to 5.5V
s Up to 5mA Output Current at –VIN Pin
s Up to 1mA Output Current at –2VIN Pin
s –VIN and –2VIN Outputs Available
s Low Supply Current
.......................................... 120µA (MAX) for TC1225
.......................................... 360µA (MAX) for TC1226
.......................................... 1.5mA (MAX) for TC1227
TYPICAL APPLICATIONS
s LCD Panel Bias
s Cellular Phones PA Bias
s Pagers
s PDAs, Portable Data loggers
s Battery Powered Devices
TYPICAL OPERATING CIRCUIT
+ C1+
C1
VIN INPUT
C1– –VIN OUTPUT 1
C2+ – COUT1
+ TC1225
+
C2 TC1226
C2– TC1227
GND
–2 VIN
OUTPUT 2
– COUT2
+
Notes:
1) C1 and COUT1 must have a voltage rating greater
than or equal to VIN
2) C2 and COUT2 must have a voltage rating greater
than or equal to 2VIN
GENERAL DESCRIPTION
The TC1225/1226/1227 are CMOS dual inverting charge
pump voltage converters in 8-Pin MSOP packages. An on-
board oscillator provides the clock, and only four external
capacitors are required for full circuit implementation. Switch-
ing frequencies are 12kHz for the TC1225, 35kHz for the
TC1226, and 125kHz for the TC1227.
These devices provide both a negative voltage inversion
(available at the –VIN output) and a negative doubling
voltage inversion (available at the –2 VIN output), with a low
output impedance capable of providing output currents up to
5mA for the –VIN output and 1mA for the –2VIN output. The
input voltage can range from +1.8V to +5.5V.
ORDERING INFORMATION
Part No. Package Osc Freq (kHz) Temp Range
TC1225EUA 8-Pin MSOP
TC1226EUA 8-Pin MSOP
TC1227EUA 8-Pin MSOP
12
35
125
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
PIN CONFIGURATION
8-Pin MSOP
C1– 1
C2+ 2
C2– 3
–2VIN 4
TC1225
TC1226
TC1227
8 –VIN
7 C1+
6 VIN
5 GND
© 2001 Microchip Technology Inc. DS21369A
TC1225/6/7-1 3/24/00
TC1225
TC1226
TC1227
Inverting Dual (–VIN, –2VIN)
Charge Pump Voltage Converters
ABSOLUTE MAXIMUM RATINGS*
Input Voltage (VIN to GND) ......................... +6.0V, – 0.3V
Output Voltage (–VIN, –2VIN to GND) ........ –12.0V, + 0.3V
Current at –VIN, –2VIN Pins ...................................... 10mA
Short-Circuit Duration –VIN, –2VIN to GND ........ Indefinite
Operating Temperature Range ............... – 40°C to +85°C
Power Dissipation (TA ≤ 70°C) MSOP-8 ............... 320mW
Storage Temperature (Unbiased) ......... – 65°C to +150°C
Lead Temperature (Soldering, 10sec) .................. +260°C
*This is a stress rating only and functional operation of the device at these
or any other conditions above those indicated in the operational sections
of the specifications is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS: TA = –40°C to +85°C, VIN = +5V, C1 = 3.3µF, C2 = 1µF (TC1225); C1 = 1µF,
C2 = 0.33µF (TC1226); C1 = 0.33µF, C2 = 0.1µF (TC1227) unless otherwise noted. Typical values are at TA = +25°C.
Symbol Parameter
Device Test Conditions
Min Typ Max Unit
IDD Supply Current
TC1225
TC1226
TC1227
— 75
— 200
— 625
VMIN
Minimum Supply Voltage All
RLOAD = 1kΩ for –VIN output
RLOAD = 10kΩ for –2VIN output
1.8 —
VMAX
Maximum Supply Voltage All
RLOAD = 1kΩ for –VIN output
RLOAD = 10kΩ for –2VIN output
——
FOSC
Oscillator Frequency
TC1225
TC1226
TC1227
8.4 12
24.5 35
65 125
VEFF1
Voltage Conversion
Efficiency (Stage 1)
All
RLOAD = ∞ for –VIN output
RLOAD = ∞ for –2VIN output
96 99.5
VEFF2
Voltage Conversion
Efficiency (Stage 2)
All
RLOAD = ∞ for –VIN output
RLOAD = ∞ for –2VIN output
94 99
ROUT1
Output Resistance
All
for –VIN output (Note 1)
ILOAD = 0.5mA to 5mA
No Load at -2VIN Output
— 45
ROUT2
Output Resistance
All
for –2VIN output (Note 1)
ILOAD = 0.1mA to 1mA
No Load at -VIN Output
— 135
NOTES: 1. Capacitor contribution is approximately 20% of the output impedance [ESR = 1/ pump frequency x capacitance)].
120
360
1500
—
5.5
15.6
45.5
170
—
—
80
420
µA
V
V
kHz
%
%
Ω
Ω
PIN DESCRIPTION
Pin Number
1
2
3
4
5
6
7
8
Name
C1–
C2+
C2–
–2VIN
GND
VIN
C1+
–VIN
Description
C1 Commutation Capacitor Negative Terminal.
C2 Commutation Capacitor Positive Terminal.
C2 Commutation Capacitor Negative Terminal.
Doubling Inverting Charge Pump Output (–2 x VIN).
Ground.
Positive Power Supply Input.
C1 Commutation Capacitor Positive Terminal.
Inverting Charge Pump Output (–1 x VIN).
TC1225/6/7-1 3/24/00
2 © 2001 Microchip Technology Inc. DS21369A
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TC1227 converter
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