TC962EPAG [MICROCHIP]
SWITCHED CAPACITOR CONVERTER, 24 kHz SWITCHING FREQ-MAX, PDIP8, PLASTIC, DIP-8;
| 型号： | TC962EPAG |
| 厂家： | 
MICROCHIP |
| 描述： | SWITCHED CAPACITOR CONVERTER, 24 kHz SWITCHING FREQ-MAX, PDIP8, PLASTIC, DIP-8 转换器 泵 |
| 文件： | 总12页 (文件大小：436K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TC962
M
High Current Charge Pump DC-to-DC Converter
Features
General Description
• Pin Compatible With TC7662/ICL7662/SI7661
• High Output Current 80mA
The TC962 is an advanced version of the industry
standard TC7662 high voltage DC-to-DC converter.
Using improved design techniques and CMOS
construction, the TC962 can source as much as 80mA
versus the 7662’s 20mA capability.
• No External Diodes Required
• Wide Operating Range 3V to 18V
• Low Output Impedance 28Ω Typ.
• No Low Voltage Terminal Required
• Application Zener On-Chip
As an inverter, the TC962 can put out voltages as high
as 18V and as low as 3V without the need for external
diodes. The output impedance of the device is a low
28Ω (with the proper capacitors), voltage conversion
efficiency is 99.9%, and power conversion efficiency is
97%.
• OSC Frequency Doubling Pin Option for Smaller
Output Capacitors
Applications
The low voltage terminal (pin 6) required in some
TC7662 applications has been eliminated. Grounding
this terminal will double the oscillator frequency from
12kHz to 24kHz. This will allow the use of smaller
capacitors for the same output current and ripple, in
most applications. Only two external capacitors are
required for inverter applications. In the event an
external clock is needed to drive the TC962 (such as
paralleling), driving this pin directly will cause the
internal oscillator to sync to the external clock.
• Laptop Computers
• Disk Drives
• Process Instrumentation
• µP-Based Controllers
Device Selection Table
Operating
Part
Package
Temp.
Range
Number
Pin 1, which is used as a test pin on the 7662, is a
voltage reference zener on the TC962. This zener
(6.4V at 5mA) has a dynamic impedance of 12Ω and is
intended for use where the TC962 is supplying current
to external regulator circuitry and a reference is needed
for the regulator circuit. (See Section 3.0 Applications
Information).
TC962COE 16-Pin SOIC Wide
0°C to +70°C
0°C to +70°C
TC962CPA
TC962EPA
TC962IJA
TC962MJA
8-Pin Plastic DIP
8-Pin Plastic DIP
8-Pin CERDIP
8-Pin CERDIP
-40°C to +85°C
-25°C to +85°C
-55°C to +125°C
The TC962 is compatible with the LTC1044, SI7661
and ICL7662. It should be used in designs that require
greater power and/or less input to output voltage drop.
It offers superior performance over the ICL7660S.
Package Type
16-Pin SOIC Wide
Zener
Cathode
1
2
3
4
5
6
7
8
16
15
V
DD
8-Pin DIP
8-Pin CERDIP
NC
NC
+
Zener
Cathode
14 C
C
OSC
V
1
2
3
4
8
7
6
5
DD
•
NC
GND
NC
13
12
11
NC
+
TC962CPA
TC962EPA
TC962IJA
TC962MJA
C
C
OSC
TC962COE
FREQ x 2
NC
GND
FREQ x 2
–
C
V
OUT
–
C
10 V
9
OUT
NC
NC
2002 Microchip Technology Inc.
DS21484B-page 1
TC962
Functional Block Diagram
8
V
DD
6
I
I
FREQ x 2
TC962
–
7
OSC/C
Timing
Level
Shift
P SW1
N SW4
Q
2
+
+
F/F
CAP
C
–
Q
Level
Shift
+
C
P
Comparator
with Hysteresis
External
3
GND
1
Zener
V
Cathode
REF
6.4V
+
OUT
C
R
Level
Shift
N SW2
N SW3
EXT
4
–
CAP
R
L
Level
Shift
5
V
OUT
DS21484B-page 2
2002 Microchip Technology Inc.
TC962
*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.
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Supply Voltage (VDD to GND) ..............................+18V
Input Voltage Any Pin
......................... (VDD +0.3) to (VSS -0.3) (Note 1)
Current Into Any Pin............................................10mA
ESD Protection ................................................±2000V
Output Short Circuit ........... Continuous (at 5.5V Input)
Package Power Dissipation (TA ≤ 70°C)
SOIC .......................................................760 mW
PDIP........................................................730 mW
CERDIP ..................................................800 mW
Package Thermal Resistance
CERDIP, RθJ-A .........................................90°C/W
PDIP, RθJ-A ............................................140°C/W
Operating Temperature Range
CPA, COE ....................................... 0°C to +70°C
IJA................................................-25°C to +85°C
EPA ..............................................-40°C to +85°C
MJA............................................-55°C to +125°C
Storage Temperature Range .............-65°C to +150°C
TC962 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: V = 15V, T = 25°C (See Figure 3-1) unless otherwise noted.
DD
A
Symbol
Parameter
Min
Typ
Max
Units
Test Conditions
V
I
Supply Voltage
Supply Current
3
—
18
V
DD
—
—
—
—
—
—
—
—
—
700
—
—
—
µA
R = ∞
L
S
V
= 15V
510
560
650
190
210
210
T = +25°C
DD
A
0 ≤ T ≤ +70°C
A
-55°C ≤ T ≤ +125°C
A
V
= 5V
T = +25°C
DD
A
—
—
0 ≤ T ≤ +70°C
A
-55°C ≤ T ≤ +125°C
A
R
Output Source
Resistance
—
—
—
32
35
—
37
40
50
Ω
I = 20mA, V = 15V
O
L
DD
I = 80mA, V = 15V
L
DD
I = 3mA, V = 5V
L
DD
F
Oscillator Frequency
Power Efficiency
—
—
12
24
—
—
kHz
%
Pin 6 Open
Pin 6 GND
OSC
P
93
—
97
—
—
—
R = 2kΩ
EFF
DEF
L
V
Voltage Efficiency
99
—
96
99.9
—
—
—
—
—
%
R = ∞
L
Over temperature range
V
Z
Zener Voltage
6.0
6.2
6.4
V
I = 5mA
Z
Z
Zener Impedance
—
12
—
Ω
I = 2.5mA to 7.5mA
ZT
L
Note 1: Connecting any input terminal to voltages greater than V+ or less than GND may cause destructive latch-up. It is recommended that no
inputs from sources operating from external supplies be applied prior to "power up" of the TC962.
2002 Microchip Technology Inc.
DS21484B-page 3
TC962
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin No.
(8-Pin DIP)
Symbol
Description
(8-Pin CERDIP)
1
2
3
4
5
6
7
8
Zener Cathode Cathode of internal zener diode.
+
C
Positive side of external CP capacitor (pump cap).
Ground terminal.
GND
-
C
Negative side of external CP capacitor (pump cap).
Output voltage.
V
OUT
FREQ x 2
If grounded, frequency doubles.
Capacitor to GND will decrease frequency.
Input voltage.
C
OSC
V
DD
Pin No.
(16-Pin SOIC)
Symbol
Zener Cathode Cathode of internal zener diode.
Description
1
2
NC
No connect.
+
3
C
Positive side of external CP capacitor (pump cap).
4
NC
GND
NC
No connect.
5
Ground terminal.
6
No connect.
-
7
C
Negative side of external CP capacitor (pump cap).
No connect.
8
NC
NC
9
No connect.
10
11
12
13
14
15
16
V
Output voltage.
OUT
NC
FREQ x 2
NC
No connect.
If grounded, frequency doubles.
No connect.
C
Capacitor to GND will decrease frequency.
No connect.
OSC
NC
V
Input voltage.
DD
DS21484B-page 4
2002 Microchip Technology Inc.
TC962
internal to the TC962. Grounding pin 6 will turn on a
current source and double the frequency. This will
double the charge current going into the internal
capacitor, as well as any capacitor added to pin 7.
3.0
3.1
APPLICATIONS INFORMATION
Theory of Operation
The TC962 is a capacitive pump (sometimes called a
switched capacitor circuit), where four MOSFET
switches control the charge and discharge of a
capacitor.
A zener diode has been added to the TC962 for use as
a reference in building external regulators. This zener
runs from pin 1 to ground.
The functional block diagram shows how the switching
action works. SW1 and SW2 are turned on simulta-
neously, charging CP to the supply voltage, VIN. This
assumes that the on resistance of the MOSFETs in
series with the capacitor results in a charging time
(3 time constants) that is less than the on time provided
by the oscillator frequency as shown:
3.2
Latch Up
All CMOS structures contain a parasitic SCR. Care
must be taken to prevent any input from going above or
below the supply rail, or latch up will occur. The result
of latch up is an effective short between VDD and VSS
.
Unless the power supply input has a current limit, this
latch up phenomena will result in damage to the device.
(See AN763 Latch-up Protection of CMOS ICs.)
3 (RDS(ON) CP) < CP/(0.5 fOSC
)
In the next cycle, SW1 and SW2 are turned off and after
a very short interval of all switches being off (this
prevents large currents from occurring due to cross
conduction), SW3 and SW4 are turned on. The charge
in CP is then transferred to CR, but with the polarity
inverted. In this way, a negative voltage is now derived.
FIGURE 3-1:
TEST CIRCUIT
690
I
S
+
V
1
8
7
NC
(+5V)
I
L
2
An oscillator supplies pulses to a flip-flop that is then
fed to a set of level shifters. These level shifters then
drive each set of switches at one-half the oscillator
frequency.
+
10µF
C
3
4
TC962
R
OSC
L
C
P
V
5
OUT
(–5V)
The oscillator has two pins that control the frequency of
oscillation. Pin 7 can have a capacitor added that is
returned to ground. This will lower the frequency of the
oscillator by adding capacitance to the timing capacitor
C
10µF
R
+
FIGURE 3-2:
TYPICAL APPLICATIONS
Combined Negative Converter and Positive Multiplier
+
Split V In Half
+
+
V
V
1
2
8
7
1
2
8
7
V
D1
10µF
V
+
D2
+
10µF
V
=
TC962
OUT
+
C
P
3
4
6
3
4
6
5
C
TC962
P2
+
= –V
V
OUT
2V –2V
D
5
+
C
10µF
R1
+
10µF
V
2
+
V
OUT
C
P1
+
+
C
R
10µF
Lowering Output Resistance by Paralleling Devices
Positive Voltage Multiplier
+
V
+
V
1
2
8
8
1
2
1
2
8
7
V
D1
7
6
5
7
V
D2
+
+
10µF
10µF
V
=
TC962
OUT
+
3
4
TC962
C
3
4
TC962
6
5
3
4
6
5
C
P2
P1
2V –2V
D
+
+
10µF
C
C
P
P
10µF
V
OUT
C
R
10µF
+
2002 Microchip Technology Inc.
DS21484B-page 5
TC962
4.0
TYPICAL CHARACTERISTICS
Note: The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein are
not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
Circuit of Figure 3-1, CP = CR = 10µF, CPESR ≈ CRESR ≈ 1Ω.
Frequency vs. Temperature
Oscillator Frequency vs. C
Supply Current vs. Temperature
OSC
20
18
16
700
600
T
= +25°C
C
= FREQ x 2 = OPEN
A
OSC
10k
500
400
300
200
+
1k
14
12
10
V
= 15V
100
+
V
= 15V
8
6
100
0
10
1
10
100
1000
10,000
-60 -40 -20
0
20 40 60 80 100 120 140
-60 -40 -20
0
20 40 60 80 100 120 140
CAPACITANCE (pF)
TEMPERATURE (°C)
TEMPERATURE (°C)
Output Resistance vs. Temperature
Current vs. Zener Voltage
Power Conversion Efficiency vs. I LOAD
80
70
T
= +25°C
T
= +25°C
A
150
50
100
90
A
135
120
EFFICIENCY
60
50
40
40
30
20
80
70
60
+
105
90
V
= 5V I = 3mA
L
SUPPLY
CURRENT
50
75
40
30
20
10
0
60
45
30
15
0
+
30
20
10
V
= 15V I = 20mA
L
10
0
4.5
4.0
ZENER VOLTAGE (V)
5.5
6.0
6.5
7.0
8
16 24 32 40 48 56 64 72 80
LOAD CURRENT (mA)
-60 -40 -20
0
20 40 60 80 100 120 140
TEMPERATURE (°C)
Output Resistance vs. Input Voltage
110
100
90
T
= +25°C
A
80
70
60
50
40
30
20
3mA
20mA
10
0
2
4
6
8
10 12 14 16 18 20
INPUT VOLTAGE (V)
DS21484B-page 6
2002 Microchip Technology Inc.
TC962
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
Package marking data not available at this time.
5.2
Package Dimensions
8-Pin CDIP (Narrow)
.110 (2.79)
.090 (2.29)
PIN 1
.300 (7.62)
.230 (5.84)
.020 (0.51) MIN.
.055 (1.40) MAX.
.320 (8.13)
.290 (7.37)
.400 (10.16)
.370 (9.40)
.040 (1.02)
.020 (0.51)
.200 (5.08)
.160 (4.06)
.015 (0.38)
.008 (0.20)
3MIN.
.150 (3.81)
MIN.
.200 (5.08)
.125 (3.18)
.400 (10.16)
.320 (8.13)
.065 (1.65)
.045 (1.14)
.020 (0.51)
.016 (0.41)
Dimensions: inches (mm)
8-Pin Plastic DIP
PIN 1
.260 (6.60)
.240 (6.10)
.045 (1.14)
.030 (0.76)
.070 (1.78)
.040 (1.02)
.310 (7.87)
.290 (7.37)
.400 (10.16)
.348 (8.84)
.200 (5.08)
.140 (3.56)
.040 (1.02)
.020 (0.51)
.015 (0.38)
.008 (0.20)
3MIN.
.150 (3.81)
.115 (2.92)
.400 (10.16)
.310 (7.87)
.110 (2.79)
.090 (2.29)
.022 (0.56)
.015 (0.38)
Dimensions: inches (mm)
2002 Microchip Technology Inc.
DS21484B-page 7
TC962
Package Dimensions (Continued)
16-Pin SOIC (Wide)
PIN 1
.299 (7.59) .419 (10.65)
.291 (7.40) .398 (10.10)
.413 (10.49)
.398 (10.10)
.104 (2.64)
.097 (2.46)
8°
MAX.
.013 (0.33)
.009 (0.23)
.012 (0.30)
.019 (0.48)
.014 (0.36)
.004 (0.10)
.050 (1.27) TYP.
.050 (1.27)
.016 (0.40)
Dimensions: inches (mm)
DS21484B-page 8
2002 Microchip Technology Inc.
TC962
Sales and Support
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-
mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1. Your local Microchip sales office
2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
3. The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
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Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
2002 Microchip Technology Inc.
DS21484B-page9
TC962
NOTES:
DS21484B-page10
2002 Microchip Technology Inc.
TC962
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 Microchip’s products as critical com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, implicitly or otherwise, under any intellectual property
rights.
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dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
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Serialized Quick Turn Programming (SQTP) is a service mark
of Microchip Technology Incorporated in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2002, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
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2002 Microchip Technology Inc.
DS21484B-page 11
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Centro Direzionale Colleoni
Palazzo Taurus 1 V. Le Colleoni 1
20041 Agrate Brianza
Tel: 408-436-7950 Fax: 408-436-7955
Toronto
Milan, Italy
Tel: 39-039-65791-1 Fax: 39-039-6899883
6285 Northam Drive, Suite 108
Mississauga, Ontario L4V 1X5, Canada
Tel: 905-673-0699 Fax: 905-673-6509
India
Microchip Technology Inc.
India Liaison Office
United Kingdom
Arizona Microchip Technology Ltd.
505 Eskdale Road
Winnersh Triangle
Wokingham
Divyasree Chambers
1 Floor, Wing A (A3/A4)
No. 11, O’Shaugnessey Road
Bangalore, 560 025, India
Tel: 91-80-2290061 Fax: 91-80-2290062
Berkshire, England RG41 5TU
Tel: 44 118 921 5869 Fax: 44-118 921-5820
03/01/02
'ꢀꢁꢂꢃ!%!ꢄ'
DS21484B-page 12
2002 Microchip Technology Inc.
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