TC1226EUA [MICROCHIP]
Inverting Dual (-VIN, -2VIN) Charge Pump Voltage Converters; 反向双（ -VIN ， -2VIN ）电荷泵电压转换器
| 型号： | TC1226EUA |
| 厂家： | 
MICROCHIP |
| 描述： | Inverting Dual (-VIN, -2VIN) Charge Pump Voltage Converters |
| 文件： | 总10页 (文件大小：1198K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TC1225
TC1226
TC1227
Inverting Dual (–VIN, –2VIN) Charge Pump Voltage Converters
FEATURES
GENERAL DESCRIPTION
■ Small 8-Pin MSOP Package
■ Operates from 1.8V to 5.5V
■ Up to 5mA Output Current at –VIN Pin
■ Up to 1mA Output Current at –2VIN Pin
■ –VIN and –2VIN Outputs Available
■ Low Supply Current
TheTC1225/1226/1227areCMOS dualinvertingcharge
pump voltage converters in 8-Pin MSOP packages. An on-
board oscillator provides the clock, and only four external
capacitorsarerequiredforfullcircuitimplementation.Switch-
ing frequencies are 12kHz for the TC1225, 35kHz for the
TC1226, and 125kHz for the TC1227.
.......................................... 120µA (MAX) for TC1225
.......................................... 360µA (MAX) for TC1226
.......................................... 1.5mA (MAX) for TC1227
Thesedevicesprovidebothanegativevoltageinversion
(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.
TYPICAL APPLICATIONS
■ LCD Panel Bias
■ Cellular Phones PA Bias
■ Pagers
ORDERING INFORMATION
■ PDAs, Portable Data loggers
■ Battery Powered Devices
Part No.
Package Osc Freq (kHz) Temp Range
TC1225EUA 8-Pin MSOP
TC1226EUA 8-Pin MSOP
TC1227EUA 8-Pin MSOP
12
35
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
TYPICAL OPERATING CIRCUIT
125
C1+
VIN
+
INPUT
PIN CONFIGURATION
C1
C1–
8-Pin MSOP
–VIN
OUTPUT 1
OUT1
–
C
C2+
–VIN
C1–
1
2
3
4
8
7
6
5
+
+
TC1225
TC1226
TC1227
C2
C1+
C2+
C2–
TC1225
TC1226
TC1227
VIN
C2–
GND
–2 VIN
OUTPUT 2
–2VIN
GND
–
C
OUT2
+
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
© 2001 Microchip Technology Inc. DS21369A
TC1225/6/7-1 3/24/00
Inverting Dual (–VIN, –2VIN)
Charge Pump Voltage Converters
TC1225
TC1226
TC1227
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.
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
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
120
360
1500
µA
VMIN
VMAX
FOSC
Minimum Supply Voltage All
RLOAD = 1kΩ for –VIN output
RLOAD = 10kΩ for –2VIN output
1.8
—
—
V
V
Maximum Supply Voltage All
RLOAD = 1kΩ for –VIN output
RLOAD = 10kΩ for –2VIN output
—
—
5.5
Oscillator Frequency
TC1225
8.4
24.5
65
12
35
125
15.6
45.5
170
kHz
TC1226
TC1227
VEFF1
VEFF2
ROUT1
ROUT2
Voltage Conversion
Efficiency (Stage 1)
All
All
All
All
RLOAD = ∞ for –VIN output
RLOAD = ∞ for –2VIN output
96
94
—
—
99.5
99
—
%
%
Ω
Ω
Voltage Conversion
Efficiency (Stage 2)
RLOAD = ∞ for –VIN output
RLOAD = ∞ for –2VIN output
—
Output Resistance
for –VIN output (Note 1)
ILOAD = 0.5mA to 5mA
No Load at -2VIN Output
45
80
Output Resistance
for –2VIN output (Note 1)
ILOAD = 0.1mA to 1mA
No Load at -VIN Output
135
420
NOTES: 1. Capacitor contribution is approximately 20% of the output impedance [ESR = 1/ pump frequency x capacitance)].
PIN DESCRIPTION
Pin Number
Name
Description
1
2
3
4
5
6
7
8
C1–
C2+
C2–
–2VIN
GND
VIN
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+
–VIN
C1 Commutation Capacitor Positive Terminal.
Inverting Charge Pump Output (–1 x VIN).
© 2001 Microchip Technology Inc. DS21369A
2
TC1225/6/7-1 3/24/00
Inverting Dual (–VIN, –2VIN)
Charge Pump Voltage Converters
TC1225
TC1226
TC1227
nominal at +25°C and VIN = +5V. The value of the ‘-2VIN’
outputandisapproximately140Ω nominalat+25°CandVIN
= +5V. In this particular case, ‘-VIN’ is approximately – 5V
and ‘–2VIN’ is approximately –10V at very light loads, and
each stage will droop according to the equation below:
DETAILED DESCRIPTION
TheTC1225/1226/1227dualchargepumpconvert-
ers perform both a –1x and –2x multiply of the voltage
applied to the VIN pin. Output ‘– VIN’ provides a negative
voltage inversion of the VIN supply, while output ‘-2 VIN’
provides a negative doubling inversion of VIN. Conversion
is performed using two synchronous switching matrices
and four external capacitors.
VDROOP = IOUT x ROUT
[-VIN OUTPUT] = VOUT1 = – (VIN – VDROOP1
)
[-2VIN OUTPUT] = VOUT2 = VOUT1 – (VIN – VDROOP2
)
Figure1(below)isablockdiagramrepresentationofthe
TC1225/1226/1227 architecture. The first switching stage
invertsthevoltagepresentatVIN andthesecondstageuses
the ‘–VIN’ output generated from the first stage to produce
the ‘–2VIN’ output function from the second stage switching
matrix.
where VDROOP1 is the output voltage droop contributed from
stage 1 loading , and VDROOP2 is the output voltage droop
from stage 2 loading.
Charge Pump Efficiency
Each device contains an on-board oscillator that syn-
chronouslycontrolstheoperationofthechargepumpswitch-
ingmatrices. TheTC1225synchronouslyswitchesat12KHz,
the TC1226 synchronously switches at 35KHz, and the
TC1227 synchronously switches at 125KHz. The different
oscillator frequencies for this device family allow the user to
trade-off capacitor size versus supply current. Faster oscil-
lators can use smaller external capacitors but will consume
moresupplycurrent(seeElectricalCharacteristicsTable).
The overall power efficiency of the two charge pump
stages is affected by four factors:
(1) Losses from power consumed by the internal oscil-
lator, switch drive, etc. (which vary with input voltage,
temperature and oscillator frequency).
(2) I2R losses due to the on-resistance of the MOSFET
switches on-board each charge pump.
V
IN
(3) Charge pump capacitor losses due to effective
series resistance (ESR).
+
—V
IN
C1
SWITCH MATRIX
(1st STAGE)
C
OUT1
(4) Losses that occur during charge transfer (from the
commutation capacitor to the output capacitor) when a
voltage difference between the two capacitors exists.
+
OSCILLATOR
Most of the conversion losses are due to factor (2), (3)
and (4) above. The losses for the first stage are given by
Equation 1a and the losses for the second stage are given
by Equation 1b.
+
—2V
IN
C2
SWITCH MATRIX
(2nd STAGE)
C
OUT2
+
P1LOSS (2, 3, 4) = IOUT1 2 x ROUT1
where ROUT1 = [ 1 / [ fOSC (C1) ] + 8RSWITCH1
+
4ESRC1 + ESRCOUT1
]
Figure 1. Functional Block Diagram
Equation 1a.
P2LOSS (2, 3, 4) = IOUT2 2 x ROUT2
where ROUT2 = [ 1 / [fOSC(C2) ] + 8RSWITCH2
APPLICATIONS INFORMATION
+
Output Voltage Considerations
4ESRC2 + ESRCOUT2
]
The TC1225/1226/1227 performs voltage conversions
but does not provide any type of regulation. The two output
voltage stages will droop in a linear manner with respect to
their respective load currents. The value of the equivalent
output resistance of the ‘-VIN’ output is approximately 50Ω
Equation 1b.
© 2001 Microchip Technology Inc. DS21369A
TC1225/6/7-1 3/24/00
3
Inverting Dual (–VIN, –2VIN)
Charge Pump Voltage Converters
TC1225
TC1226
TC1227
The internal switch resistance for the first stage (i.e.
RSWITCH1) is approximately 3 and the switch resistance for
the second stage (i.e. RSWITCH2) is approximately 7
values of COUT1 and Table 2b shows the output voltage
ripple for various values of COUT2 (again assuming VIN=5V
@ +25oC). The VRIPPLE1 values assume a 3mA output load
Ω
Ω.
current for stage 1 and a 0.1
values assume a 200uA output load current for stage 2 and
a 0.1 ESRCOUT1
Ω ESRCOUT1. The VRIPPLE2
The losses in the circuit due to factor (4) above are also
shown in Equation 2a for stage 1 and Equation 2b for stage
2. The output voltage ripple for stage 1 is given by Equation
3a and the output voltage ripple for stage 2 is given by
Equation 3b.
Ω
.
Table 1a. Output Resistance vs. C1 (ESR = 0.1
Ω
). For Stage 1
C1 (
µ
F)
TC1225 ROUT
(
Ω
)
TC1226 ROUT
(
Ω
)
TC1227 ROUT (Ω)
PLOSS1 (4) = [ (0.5)(C1)(VIN 2 – VOUT12 ) + (0.5)
(COUT1) (VRIPPLE1 - 2VOUT1 VRIPPLE1) ] x fOSC
2
0.47
1
202
108
50
85
53
33
42
33
27
3.3
Equation 2a.
PLOSS2 (4) = [ (0.5) (C2) (VIN 2 – VOUT22 ) + (0.5)
(COUT2) (VRIPPLE2 - 2VOUT2 VRIPPLE2) ] x fOSC
Table 1b. Output Resistance vs. C2 (ESR = 0.1
Ω
). For Stage 2
2
C2 (
µ
F)
TC1225 ROUT
(
Ω
)
TC1226 ROUT
(
Ω
)
TC1227 ROUT (Ω)
0.1
0.47
1
890
239
140
342
117
85
137
74
Equation 2b.
VRIPPLE1 = [ IOUT1 / (fOSC) (COUT1) ] + 2 (IOUT1
(ESRCOUT1
)
)
65
)
Table 2a. Output Voltage Ripple vs. COUT1 (ESR = 0.1
Ω
) For Stage 1
Equation 3a.
(IOUT1 = 3mA)
VRIPPLE2 = [ IOUT2 / (fOSC) (COUT2) ] + 2 (IOUT2
COUT1
F)
TC1225 VRIPPLE1
TC1226 VRIPPLE1
TC1227 VRIPPLE1
(mV)
(ESRCOUT2
)
(
µ
(mV)
(mV)
0.47
1
533
251
76
183
86
52
25
8
Equation 3b.
Capacitor Selection
3.3
27
In order to maintain the lowest output resistance and
output ripple voltage, it is recommended that low ESR
capacitorsbeused. Additionally, largervaluesofC1andC2
will lower the output resistance and larger values of COUT1
and COUT2 will reduce output ripple. (See Equations 1a, 1b,
3a, and 3b). NOTE: For proper charge pump operation,
C1 and COUT1 must have a voltage rating greater than or
equal to VIN, while C2 and COUT2 must have a voltage
rating greater than or equal to 2VIN.
Table 2b. Output Voltage Ripple vs. COUT2 (ESR = 0.1Ω) For Stage 2
(IOUT2 = 200µA)
COUT2
F)
TC1225 VRIPPLE2
(mV)
TC1226 VRIPPLE2
(mV)
TC1227 VRIPPLE2
(mV)
(
µ
0.1
0.47
1
167
36
57
12
16
3.4
1.6
17
5.8
Input Supply Bypassing
Table 1a shows various values of C1 and the corre-
sponding output resistance values for VIN=5V @ +25°C for
stage 1 and Table 1b shows various values of C2 and the
correspondingoutputresistancevaluesforVIN=5V@+25°C
TheVIN inputshouldbecapacitivelybypassedtoreduce
ACimpedanceandminimizenoiseeffectsduetotheswitch-
ing internal to the device. It is recommended that a large
value capacitor (at least equal to C1) be connected from VIN
to GND for optimal circuit performance.
for stage 2. It assumes a 0.1
RSWITCH1, and a 7 RSWITCH2
Table 2a shows the output voltage ripple for various
Ω ESRC1, a 0.1Ω ESRC2, a 3Ω
Ω
.
© 2001 Microchip Technology Inc. DS21369A
4
TC1225/6/7-1 3/24/00
Inverting Dual (–VIN, –2VIN)
Charge Pump Voltage Converters
TC1225
TC1226
TC1227
Figure 3 is a schematic of the TC1225 DEMO Card, and
Figure 4 shows the assembly drawing and artwork for the
board. Table 3 lists the voltages that are monitored by the
test points and Table 4 lists the currents that can be
measured using the jumpers.
Dual Voltage Inverter
The most common application for the TC1225/1226/
1227 devices is the dual voltage inverter (Figure 2). This
application uses four external capacitors: C1, C2, COUT1
,
and COUT2 (NOTE: a power supply bypass capacitor is
recommended). The outputs are equal to – VIN and –2VIN
plus any voltage drops due to loading. Refer to Tables 1a,
1b, 2a, and 2b for capacitor selection guidelines.
Table 3. TC1225 DEMO Card Test Points
TEST POINT VOLTAGE MEASUREMENT
TP1
TP2
TP3
TP4
TP5
TP6
TP7
VIN [+5V]
GROUND
Device
TC1225
TC1226
TC1227
CIN
3.3µF 3.3µF
1µF
C1
C2
COUT1
COUT2
GROUND
1µF
3.3µF
1µF
TCM828 U1 OUTPUT [-5V(1)]
TCM828 U2 OUTPUT [-10V(1)]
TC1225 STAGE 1 OUTPUT [-5V(2)]
TC1225 STAGE 2 OUTPUT [-10V(2)]
1µF 0.33µF
1µF 0.33µF
0.33µF 0.33µF 0.1µF 0.33µF
0.1µF
V
IN
C
IN
6
Table 4. TC1225 DEMO Card Jumpers
V
7
IN
+
C1
JUMPER
CURRENT MEASUREMNT
8
–V
IN
V
C1
C2
OUT1
J1
J2
J3
J4
J5
J6
DUAL TCM828 QUIESCENT CURRENT
TC1225 QUIESCENT CURRENT
C
OUT1
1
2
–
R
R
C1
L1
TC1225
TC1226
TC1227
+
TCM828 U1 [-5V(1)] LOAD CURRENT
TCM828 U2 [-10V(1)] LOAD CURRENT
TC1225 STAGE 1 [-5V(2)] LOAD CURRENT
TC1225 STAGE 2 [-10V(2)] LOAD CURRENT
C2
4
V
–2V
OUT2
IN
C
3
OUT2
–
C2
GND
5
L2
Figure 2. Dual Voltage Inverter Test Circuit
Layout Considerations
As with any switching power supply circuit good layout
practice is recommended. Mount components as close
together as possible to minimize stray inductance and
capacitance. Also use a large ground plane to minimize
noise leakage into other circuitry.
TC1225 DEMO CARD
The TC1225 DEMO Card is a 2.0” x 2.0” card containing
both a TC1225 and two cascaded TCM828s that allow the
user to compare the operation of each approach for gener-
atinga–1Xand–2Xfunction. Eachcircuitisfullyassembled
with the required external capacitors along with variable
load resistors that allow the user to vary the output load
current of each stage. For convenience, several test points
and jumpers are available for measuring various voltages
and currents on the demo board.
© 2001 Microchip Technology Inc. DS21369A
TC1225/6/7-1 3/24/00
5
Inverting Dual (–VIN, –2VIN)
Charge Pump Voltage Converters
TC1225
TC1226
TC1227
Figure 3. TC1225 DEMO Card Schematic
Figure 4. TC1225 DEMO Card Assembly Drawing and Artwork
© 2001 Microchip Technology Inc. DS21369A
6
TC1225/6/7-1 3/24/00
Inverting Dual (–VIN, –2VIN)
Charge Pump Voltage Converters
TC1225
TC1226
TC1227
TYPICAL RIPPLE WAVEFORMS
© 2001 Microchip Technology Inc. DS21369A
TC1225/6/7-1 3/24/00
7
Inverting Dual (–VIN, –2VIN)
Charge Pump Voltage Converters
TC1225
TC1226
TC1227
TAPING FORM
Component Taping Orientation for 8-Pin MSOP Devices
User Direction of Feed
User Direction of Feed
PIN 1
W
PIN 1
P
Standard Reel Component Orientation
for TR Suffix Device
Reverse Reel Component Orientation
for RT Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
8-Pin MSOP
12 mm
8 mm
2500
13 in
PACKAGE DIMENSIONS
8-Pin MSOP
PIN 1
.197 (5.00)
.189 (4.80)
.122 (3.10)
.114 (2.90)
.026 (0.65) TYP.
.122 (3.10)
.114 (2.90)
.043 (1.10)
MAX.
.008 (0.20)
.005 (0.13)
6° MAX.
.016 (0.40)
.010 (0.25)
.006 (0.15)
.002 (0.05)
.028 (0.70)
.016 (0.40)
Dimensions: inches (mm)
© 2001 Microchip Technology Inc. DS21369A
8
TC1225/6/7-1 3/24/00
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2001 Microchip Technology Incorporated. Printed in the USA. 1/01
Printed on recycled paper.
Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by
updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual
property rights arising from such use or otherwise. Use of Microchipís products as critical components in life support systems is not authorized except with
express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, except as maybe explicitly expressed herein, under any intellec-
tual property rights. The Microchip logo and name are registered trademarks of Microchip Technology Inc. in the U.S.A. and other countries. All rights
reserved. All other trademarks mentioned herein are the property of their respective companies.
© 2001 Microchip Technology Inc. DS21369A
TC1225/6/7-1 3/24/00
9
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