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PDF TC962EPA Data sheet ( Hoja de datos )

Número de pieza TC962EPA
Descripción High Current Charge Pump DC-to-DC Converter
Fabricantes Microchip Technology 
Logotipo Microchip Technology Logotipo




1. TC962EPA






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M
TC962
High Current Charge Pump DC-to-DC Converter
Features
• Pin Compatible With TC7662/ICL7662/SI7661
• High Output Current 80mA
• No External Diodes Required
• Wide Operating Range 3V to 18V
• Low Output Impedance 28Typ.
• No Low Voltage Terminal Required
• Application Zener On-Chip
OSC Frequency Doubling Pin Option for Smaller
Output Capacitors
Applications
Laptop Computers
Disk Drives
Process Instrumentation
µP-Based Controllers
Device Selection Table
Part
Number
TC962COE
TC962CPA
TC962EPA
TC962IJA
TC962MJA
Package
Operating
Temp.
Range
16-Pin SOIC Wide
8-Pin Plastic DIP
8-Pin Plastic DIP
8-Pin CERDIP
8-Pin CERDIP
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-25°C to +85°C
-55°C to +125°C
General Description
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 7662s 20mA capability.
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
28(with the proper capacitors), voltage conversion
efficiency is 99.9%, and power conversion efficiency is
97%.
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.
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 12and 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).
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
C+
GND
C–
8-Pin DIP
8-Pin CERDIP
1• 8
2 TC962CPA 7
TC962EPA
3 TC962IJA 6
4 TC962MJA 5
VDD
COSC
FREQ x 2
VOUT
Zener
Cathode
NC
C+
NC
GND
NC
C
1
2
3
4
5
6
7
TC962COE
16 VDD
15 NC
14 COSC
13 NC
12 FREQ x 2
11 NC
10 VOUT
NC 8
9 NC
2002 Microchip Technology Inc.
DS21484B-page 1

1 page




TC962EPA pdf
TC962
3.0 APPLICATIONS INFORMATION
3.1 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.
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 (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.
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.
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
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.
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.
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.)
FIGURE 3-1:
TEST CIRCUIT
690
NC 1
2
8
7
+ 10µF
CP
3
TC962
45
COSC
IS V +
IL (+5V)
RL
VOUT
(5V)
CR + 10µF
FIGURE 3-2:
TYPICAL APPLICATIONS
Combined Negative Converter and Positive Multiplier
V+
1
2
CP2 + 10µF 3
4
TC962
CP1
+
8
7
6
5 VOUT = V+
+ 10µF
VD1
VD2
+
CR1
VOUT =
2V+ 2VD
10µF
Split V+ In Half
1
2
+ 10µF
CP 3
4
TC962
V+
8
7
6
5
+
CR
VOUT
=
V+
2
10µF
Lowering Output Resistance by Paralleling Devices
V+
1
2
+
CP1
10µF 3
4
TC962
8
7
6
5
1
2
+
CP2
10µF
3
4
TC962
8
7
6
5
CR
+
VOUT
10µF
Positive Voltage Multiplier
V+
18
27
3 TC962 6
VD1
VD2
4
5
CP
+
10µF
+
CP
VOUT =
2V+2VD
10µF
2002 Microchip Technology Inc.
DS21484B-page 5

5 Page





TC962EPA arduino
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 Microchips 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.
Trademarks
The Microchip name and logo, the Microchip logo, FilterLab,
KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER,
PICSTART, PRO MATE, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip Tech-
nology Incorporated in the U.S.A. and other countries.
dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, microPort,
Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,
MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode
and Total Endurance are trademarks of Microchip Technology
Incorporated in the U.S.A.
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.
2002 Microchip Technology Inc.
Microchip received QS-9000 quality system
certification for its worldwide headquarters,
design and wafer fabrication facilities in
Chandler and Tempe, Arizona in July 1999
and Mountain View, California in March 2002.
The Company’s quality system processes and
procedures are QS-9000 compliant for its
PICmicro® 8-bit MCUs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals,
non-volatile memory and analog products. In
addition, Microchips quality system for the
design and manufacture of development
systems is ISO 9001 certified.
DS21484B-page 11

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