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PDF TC7660 Data sheet ( Hoja de datos )
| Número de pieza | TC7660 | |
| Descripción | CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER | |
| Fabricantes | TelCom Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TC7660 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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EVALUATION
KIT
AVAILABLE
1
TC7660
CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
FEATURES
GENERAL DESCRIPTION
2
s Converts +5V Logic Supply to ±5V System
s Wide Input Voltage Range .................... 1.5V to 10V
s Efficient Voltage Conversion ......................... 99.9%
s Excellent Power Efficiency ............................... 98%
s Low Power Supply ...............................80µA @ 5VIN
s Low Cost and Easy to Use
— Only Two External Capacitors Required
s RS232 Negative Power Supply
s Available in Small Outline (SO) Package
s Improved ESD Protection ....................... Up to 3kV
s No Dx Diode Required for High Voltage Operation
PIN CONFIGURATION (DIP and SOIC)
The TC7660 is a pin-compatible replacement for the
Industry standard TC7660 charge pump voltage converter.
It converts a +1.5V to +10V input to a corresponding – 1.5V
to – 10V output using only two low-cost capacitors, eliminat-
ing inductors and their associated cost, size and EMI.
The on-board oscillator operates at a nominal fre-
quency of 10kHz. Operation below 10kHz (for lower supply
current applications) is possible by connecting an external
capacitor from OSC to ground (with pin 1 open).
The TC7660 is available in both 8-pin DIP and 8-pin
SOIC packages in commercial and extended temperature
ranges.
ORDERING INFORMATION
3
4
NC 1
8 V+
CAP + 2
7 OSC
GND
CAP –
3
4
TC7660CPA
TC7660EPA
TC7660IJA
6
5
LOW
VOLTAGE (LV)
VOUT
NC 1
CAP + 2
GND 3
CAP – 4
8 V+
7 OSC
TC7660COA
TC7660CPA
6
LOW
VOLTAGE (LV)
5 VOUT
NC = NO INTERNAL CONNECTION
Part No.
TC7660COA
TC7660CPA
TC7660EOA
TC7660EPA
TC7660IJA
TC7660MJA
TC7660EV
Package
Temperature
Range
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
– 40°C to +85°C
8-Pin CerDIP
– 55°C to +125°C
Evaluation Kit for
Charge Pump Family
5
FUNCTIONAL BLOCK DIAGRAM
V + CAP +
6
82
OSC
7
6
LV
RC
OSCILLATOR
÷2
INTERNAL
VOLTAGE
REGULATOR
TC7660
TELCOM SEMICONDUCTOR, INC.
VOLTAGE–
LEVEL
TRANSLATOR
3
GND
4 CAP –
5 VOUT
7
LOGIC
NETWORK
TC7660-7 9/30/96
4-51
8
1 page  
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
1
TC7660
C1 +
10µF
18
27
3 TC7660 6
45
COSC*
IS
V+
(+5V)
IL
RL
VO
C2
+ 10µF
NOTES: * For large values of COSC (>1000pF), the values
of C1 and C2 should be increased to 100µF.
Figure 1. TC7660 Test Circuit
Detailed Description
The TC7660 contains all the necessary circuitry to
implement a voltage inverter, with the exception of two
external capacitors, which may be inexpensive 10 µF polar-
ized electrolytic capacitors. Operation is best understood by
considering Figure 2, which shows an idealized voltage
inverter. Capacitor C1 is charged to a voltage, V+, for the half
cycle when switches S1 and S3 are closed. (Note: Switches
S2 and S4 are open during this half cycle.) During the second
half cycle of operation, switches S2 and S4 are closed, with
S1 and S3 open, thereby shifting capacitor C1 negatively by
V+ volts. Charge is then transferred from C1 to C2, such that
the voltage on C2 is exactly V+, assuming ideal switches and
no load on C2.
The four switches in Figure 2 are MOS power switches;
S1 is a P-channel device, and S2, S3 and S4 are N-channel
devices. The main difficulty with this approach is that in
integrating the switches, the substrates of S3 and S4 must
always remain reverse-biased with respect to their sources,
but not so much as to degrade their ON resistances. In
addition, at circuit start-up, and under output short circuit
conditions (VOUT = V+), the output voltage must be sensed
and the substrate bias adjusted accordingly. Failure to
accomplish this will result in high power losses and probable
device latch-up.
This problem is eliminated in the TC7660 by a logic
network which senses the output voltage (VOUT) together
with the level translators, and switches the substrates of S3
and S4 to the correct level to maintain necessary reverse
bias.
The voltage regulator portion of the TC7660 is an
integral part of the anti-latch-up circuitry. Its inherent voltage
drop can, however, degrade operation at low voltages. To
improve low-voltage operation, the LV pin should be
connected to GND, disabling the regulator. For supply
voltages greater than 3.5V, the LV terminal must be left
open to ensure latch-up-proof operation and prevent device
damage.
2
3
4
Theoretical Power Efficiency
Considerations
In theory, a capacitive charge pump can approach
100% efficiency if certain conditions are met:
(1) The drive circuitry consumes minimal power.
(2) The output switches have extremely low ON
resistance and virtually no offset.
(3) The impedances of the pump and reservoir
capacitors are negligible at the pump frequency.
5
6
V+ S1
GND
S3
S2
C2
S4
VOUT
= – VIN
7
Figure 2. Idealized Charge Pump Inverter
TELCOM SEMICONDUCTOR, INC.
8
4-55
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet TC7660.PDF ] | |
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