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PDF TC1044S Data sheet ( Hoja de datos )

Número de pieza TC1044S
Descripción Charge Pump DC-TO-DC Voltage Converter
Fabricantes Microchip Technology 
Logotipo Microchip Technology Logotipo



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No Preview Available ! TC1044S Hoja de datos, Descripción, Manual

EVALUATION
KIT
AVAILABLE
TC1044S
Charge Pump DC-TO-DC Voltage Converter
FEATURES
s Converts +5V Logic Supply to ±5V System
s Wide Input Voltage Range .................... 1.5V to 12V
s Efficient Voltage Conversion ......................... 99.9%
s Excellent Power Efficiency ............................... 98%
s Low Power Consumption ............ 80µA @ VIN = 5V
s Low Cost and Easy to Use
— Only Two External Capacitors Required
s RS-232 Negative Power Supply
s Available in 8-Pin Small Outline (SOIC) and 8-Pin
Plastic DIP Packages
s Improved ESD Protection ..................... Up to 10kV
s No External Diode Required for High Voltage
Operation
s Frequency Boost Raises FOSC to 45kHz
GENERAL DESCRIPTION
The TC1044S is a pin-compatible upgrade to the Indus-
try standard TC7660 charge pump voltage converter. It
converts a +1.5V to +12V input to a corresponding –1.5V
to –12V output using only two low cost capacitors, eliminat-
ing inductors and their associated cost, size and EMI.
Added features include an extended supply range to 12V,
and a frequency boost pin for higher operating frequency,
allowing the use of smaller external capacitors.
The on-board oscillator operates at a nominal frequency
of 10kHz. Frequency is increased to 45kHz when pin 1 is
connected to V+. Operation below 10kHz (for lower supply
current applications) is possible by connecting an external
capacitor from OSC to ground (with pin 1 open).
The TC1044S is available in both 8-pin DIP and
8-pin small outline (SOIC) packages in commercial and
extended temperature ranges.
PIN CONFIGURATION (DIP AND SOIC)
BOOST 1
8 V+
CAP + 2 TC1044SCPA 7 OSC
TC1044SEPA
GND
3
TC1044SIJA 6
TC1044SMJA
LOW
VOLTAGE (LV)
CAP 4
5 VOUT
BOOST 1
8 V+
CAP + 2 TC1044SCOA 7 OSC
GND
3 TC1044SEOA 6
LOW
VOLTAGE (LV)
CAP 4
5 VOUT
FUNCTIONAL BLOCK DIAGRAM
1
BOOST
ORDERING INFORMATION
Part No.
Package
Temp. Range
TC1044SCOA
TC1044SCPA
TC1044SEOA
TC1044SEPA
TC1044SIJA
TC1044SMJA
TC7660EV
8-Pin SOIC
0°C to +70°C
8-Pin Plastic DIP
0°C to +70°C
8-Pin SOIC
– 40°C to +85°C
8-Pin Plastic DIP – 40°C to +85°C
8-Pin CerDIP
– 25°C to +85°C
8-Pin CerDIP
– 55°C to +125°C
Charge Pump Family Evaluation Kit
V + CAP +
82
7
OSC
RC
OSCILLATOR
6
LV
2
INTERNAL
VOLTAGE
REGULATOR
TC1044S
VOLTAGE
LEVEL
TRANSLATOR
3
GND
4 CAP
5 VOUT
LOGIC
NETWORK
© 2001 Microchip Technology Inc. DS21348A
TC1044S-12 9/16/96

1 page




TC1044S pdf
Charge Pump DC-TO-DC Voltage Converter
TC1044S
+
10µF
V+
18
27
TC1044S
36
4 "1" 5
* NOTES:
1. VOUT = n(V+) for 1.5V V+ 12V
+
10µF
18
2 TC1044S 7
36
4 "n" 5
+ 10µF
VOUT*
+ 10µF
Figure 5. Increased Output Voltage by Cascading Devices
Cascading Devices
The TC1044S may be cascaded as shown (Figure 5) to
produce larger negative multiplication of the initial supply
voltage. However, due to the finite efficiency of each device,
the practical limit is 10 devices for light loads. The output
voltage is defined by:
VOUT = n(VIN)
where n is an integer representing the number of devices
cascaded. The resulting output resistance would be ap-
proximately the weighted sum of the individual TC1044S
ROUT values.
Changing the TC1044S Oscillator Frequency
It may be desirable in some applications (due to noise or
other considerations) to increase the oscillator frequency.
Pin 1, frequency boost pin may be connected to V+ to
increase oscillator frequency to 45kHz from a nominal of
10kHz for an input supply voltage of 5.0 volts. The oscillator
may also be synchronized to an external clock as shown in
Figure 6. In order to prevent possible device latch-up, a 1k
resistor must be used in series with the clock output. In a
+
10µF
18
27
TC1044S
36
45
V+
1k
V+
CMOS
GATE
VOUT
10µF
+
situation where the designer has generated the external
clock frequency using TTL logic, the addition of a 10kpull-
up resistor to V+ supply is required. Note that the pump
frequency with external clocking, as with internal clocking,
will be 1/2 of the clock frequency. Output transitions occur on
the positive-going edge of the clock.
It is also possible to increase the conversion efficiency
of the TC1044S at low load levels by lowering the oscillator
frequency. This reduces the switching losses, and is achieved
by connecting an additional capacitor, COSC, as shown in
Figure 7. Lowering the oscillator frequency will cause an
undesirable increase in the impedance of the pump (C1) and
the reservoir (C2) capacitors. To overcome this, increase the
values of C1 and C2 by the same factor that the frequency
has been reduced. For example, the addition of a 100pF
capacitor between pin 7 (OSC) and pin 8 (V+) will lower the
oscillator frequency to 1kHz from its nominal frequency of
10kHz (a multiple of 10), and necessitate a corresponding
increase in the values of C1 and C2 (from 10µF to 100µF).
Positive Voltage Multiplication
The TC1044S may be employed to achieve positive
voltage multiplication using the circuit shown in Figure 8. In
this application, the pump inverter switches of the TC1044S
are used to charge C1 to a voltage level of V+ VF (where V+
is the supply voltage and VF is the forward voltage drop of
diode D1). On the transfer cycle, the voltage on C1 plus the
supply voltage (V+) is applied through diode D2 to capacitor
C2. The voltage thus created on C2 becomes (2V+) (2VF),
or twice the supply voltage minus the combined forward
voltage drops of diodes D1 and D2.
The source impedance of the output (VOUT) will depend
on the output current, but for V+ = 5V and an output current
of 10mA, it will be approximately 60.
Figure 6. External Clocking
© 2001 Microchip Technology Inc. DS21348A
5
TC1044S-12 9/16/96

5 Page





TC1044S arduino
Charge Pump DC-TO-DC Voltage Converter
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TC1044S
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All rights reserved. © 2001 Microchip Technology Incorporated. Printed in the USA. 1/01
Printed on recycled paper.
01/09/01
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. DS21348A
11
TC1044S-12 9/16/96

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