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TC1227 Datasheet PDF : 10 Pages
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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
120
µA
—
200
360
—
625
1500
VMIN
Minimum Supply Voltage All
RLOAD = 1kΩ for –VIN output
RLOAD = 10kΩ for –2VIN output
1.8
—
—
V
VMAX
Maximum Supply Voltage All
RLOAD = 1kΩ for –VIN output
RLOAD = 10kΩ for –2VIN output
—
—
5.5
V
FOSC
Oscillator Frequency
TC1225
TC1226
TC1227
8.4
12
24.5
35
65
125
15.6 kHz
45.5
170
VEFF1
Voltage Conversion
All
Efficiency (Stage 1)
RLOAD = ∞ for –VIN output
RLOAD = ∞ for –2VIN output
96
99.5
—
%
VEFF2
Voltage Conversion
All
Efficiency (Stage 2)
RLOAD = ∞ for –VIN output
RLOAD = ∞ for –2VIN output
94
99
—
%
ROUT1
ROUT2
Output Resistance
All
for –VIN output (Note 1)
Output Resistance
All
for –2VIN output (Note 1)
ILOAD = 0.5mA to 5mA
No Load at -2VIN Output
ILOAD = 0.1mA to 1mA
No Load at -VIN Output
—
45
80
Ω
—
135
420
Ω
NOTES: 1. Capacitor contribution is approximately 20% of the output impedance [ESR = 1/ pump frequency x capacitance)].
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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