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PDF TC7662B Data sheet ( Hoja de datos )
| Número de pieza | TC7662B | |
| Descripción | CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER | |
| Fabricantes | Microchip Technology | |
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EVALUATION
KIT
AVAILABLE
TC7662B
CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
FEATURES
s Wide Operating Voltage Range: 1.5V to 15V
s Boost Pin (Pin 1) for Higher Switching Frequency
s High Power Efficiency is 96%
s Easy to Use – Requires Only 2 External Non-Critical
Passive Components
s Improved Direct Replacement for Industry Stan-
dard ICL7660 and Other Second Source Devices
APPLICATIONS
s Simple Conversion of +5V to ±5V Supplies
s Voltage Multiplication VOUT = ±nVIN
s Negative Supplies for Data Acquisition Systems
and Instrumentation
s RS232 Power Supplies
s Supply Splitter, VOUT = ±VS/2
PIN CONFIGURATION (DIP AND SOIC)
BOOST 1
8 V+
BOOST 1
8 V+
CAP + 2
7 OSC
CAP + 2
7 OSC
GND
3
TC7662BCPA
TC7662BEPA
6
LOW
VOLTAGE (LV)
CAP – 4
5 VOUT
GND
3
TC7662BCOA
TC7662BEOA
6
LOW
VOLTAGE (LV)
CAP – 4
5 VOUT
GENERAL DESCRIPTION
The TC7662B is a pin-compatible upgrade to the Indus-
try standard TC7660 charge pump voltage converter. It
converts a +1.5V to +15V input to a corresponding – 1.5 to
– 15V output using only two low-cost capacitors, eliminating
inductors and their associated cost, size and EMI.
The on-board oscillator operates at a nominal fre-
quency of 10kHz. Frequency is increased to 35kHz when
pin 1 is connected to V+, allowing the use of smaller external
capacitors. Operation below 10kHz (for lower supply current
applications) is also possible by connecting an external
capacitor from OSC to ground (with pin 1 open).
The TC7662B is available in both 8-pin DIP and 8-pin
small outline (SO) packages in commercial and extended
temperature ranges.
ORDERING INFORMATION
Part No.
Package
Temperature
Range
TC7662BCOA
TC7662BCPA
TC7662BEOA
TC7662BEPA
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
Evaluation Kit for
Charge Pump Family
FUNCTIONAL BLOCK DIAGRAM
BOOST
1
OSC
LV
7 RC
OSCILLATOR
6
÷2
INTERNAL
VOLTAGE
REGULATOR
TC7662B
© 2001 Microchip Technology Inc. DS21469A
V + CAP +
82
VOLTAGE–
LEVEL
TRANSLATOR
3
GND
4 CAP –
5 VOUT
LOGIC
NETWORK
TC7662B-8 9/11/96
1 page  
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
TC7662B
Paralleling Devices
Changing the TC7662B Oscillator Frequency
Any number of TC7662B voltage converters may be
paralleled to reduce output resistance (Figure 5). The reser-
voir capacitor, C2, serves all devices, while each device
requires its own pump capacitor, C1. The resultant output
resistance would be approximately:
ROUT =
ROUT (of TC7662B)
n (number of devices)
V+
18
27
C1
TC7662B
36
4 "1" 5
18
27
C1 3 TC7662B 6
4 "n" 5
RL
+ C2
Figure 5. Paralleling Devices
Cascading Devices
The TC7662B may be cascaded as shown 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 TC7662B
ROUT values.
It may be desirable in some applications (due to noise or
other considerations) to increase the oscillator frequency.
This is achieved by one of several methods described
below:
By connecting the BOOSTPin (Pin 1) to V+, the oscillator
charge and discharge current is increased and, hence the
oscillator frequency is increased by approximately 3-1/2
times. The result is a decrease in the output impedance and
ripple. This is of major importance for surface mount appli-
cations where capacitor size and cost are critical. Smaller
capacitors, e.g., 0.1µF, can be used in conjunction with the
Boost Pin in order to achieve similar output currents com-
pared to the device free running with C1 = C2 = 1µF or 10µF.
(Refer to graph of Output Source Resistance as a Function
of Oscillator Frequency).
Increasing the oscillator frequency can also be achieved
by overdriving the oscillator from an external clock as shown
in Figure 7. In order to prevent device latchup, a 1kΩ resistor
must be used in series with the clock output. In a situation
where the designer has generated the external clock fre-
quency using TTL logic, the addition of a 10kΩ pullup
resistor to V+ supply is required. Note that the pump fre-
quency 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.
+
10µF
18
27
3 TC7662B 6
45
V+
1 kΩ
V+
CMOS
GATE
VOUT
10µF
+
Figure 7. External Clocking
+
10µF
V+
18
27
3 TC7662B 6
4 "1" 5
+
10µF
*VOUT = –nV+
10µF
18
27
3 TC7662B 6
4 "n" 5
VOUT
+ 10µF
Figure 6. Cascading Devices for Increased Output Voltage
© 2001 Microchip Technology Inc. DS21469A
It is also possible to increase the conversion efficiency
of the TC7662B at low load levels by lowering the oscillator
frequency. This reduces the switching losses, and is shown
in Figure 8. However, lowering the oscillator frequency will
cause an undesirable increase in the impedance of the
pump (C1) and reservoir (C2) capacitors; this is overcome by
increasing 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 V+ will lower
the oscillator frequency to 1kHz from its nominal frequency
of 10kHz (multiple of 10), and thereby necessitate a corre-
sponding increase in the value of C1 and C2 (from 10µF to
100µF).
5 TC7662B-8 9/11/96
5 Page 
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
TC7662B
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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. DS21469A
11
TC7662B-8 9/11/96
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet TC7662B.PDF ] | |
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