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PDF TC7660S Data sheet ( Hoja de datos )

Número de pieza TC7660S
Descripción Super Charge Pump DC-to-DC Voltage Converter
Fabricantes Microchip Technology 
Logotipo Microchip Technology Logotipo



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TC7660S
Super Charge Pump DC-to-DC Voltage Converter
Features
• Oscillator boost from 10 kHz to 45 kHz
• Converts +5V Logic Supply to ±5V System
• Wide Input Voltage Range: +1.5V to +12V
• Efficient Voltage Conversion (99.9%, typical)
• Excellent Power Efficiency (98%, typical)
• Low PowerConsumption:80 µA(typical)@VIN=5V
• Low Cost and Easy to Use
- Only Two External Capacitors Required
• Available in 8-Pin Small Outline (SOIC) and 8-Pin
PDIP Packages
• Improved ESD Protection (10 kV HBM)
• No External Diode Required for High-Voltage
Operation
Applications
• RS-232 Negative Power Supply
• Simple Conversion of +5V to ±5V Supplies
• Voltage Multiplication VOUT = ± n V+
• Negative Supplies for Data Acquisition Systems
and Instrumentation
Package Types
PDIP/SOIC
BOOST 1
CAP+ 2
GND 3
CAP- 4
TC7660S
8 V+
7 OSC
6
LOW
VOLTAGE (LV)
5 VOUT
General Description
The TC7660S device is a pin-compatible replacement
for the industry standard 7660 charge pump voltage
converter. It converts a +1.5V to +12V input to a corre-
sponding -1.5V to -12V output using only two low-cost
capacitors, eliminating inductors and their associated
cost, size and electromagnetic interference (EMI).
Added features include an extended supply range to
12V, and a frequency boost pin for higher operating fre-
quency, allowing the use of smaller external capacitors.
The on-board oscillator operates at a nominal fre-
quency of 10 kHz. Frequency is increased to 45 kHz
when pin 1 is connected to V+. Operation below 10 kHz
(for lower supply current applications) is possible by
connecting an external capacitor from OSC to ground
(with pin 1 open).
The TC7660S is available in 8-Pin PDIP and 8-Pin
Small Outline (SOIC) packages in commercial and
extended temperature ranges.
2001-2015 Microchip Technology Inc.
DS20001467C-page 1

1 page




TC7660S pdf
TC7660S
2.0 TYPICAL PERFORMANCE CURVES
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.
Note: Unless otherwise indicated, C1 = C2 = 10 µF, ESRC1 = ESRC2 = 1 , TA = 25°C. See Figure 4-1.
IN
12 60
10 50
8 40
VIN = 5V
6
VIN = 5V
30
VIN = 12V
4 20
VIN = 12V
2 10
0-40 -20 0 20 40 60
TEMPERATURE (°C)
80
FIGURE 2-1:
Unloaded Oscillator
Frequency vs. Temperature.
100
0-40 -20 0 20 40 60
TEMPERATURE (°C)
80 100
FIGURE 2-4:
Unloaded Oscillator
Frequency vs. Temperature with Boost Pin = VIN.
1000
800
600 VIN = 12V
400
200
VIN = 5V
0-40 -20 0
20 40 60
TEMPERATURE (°C)
80
FIGURE 2-2:
Supply Current vs.
Temperature (with Boost Pin = VIN).
100
100
70
50
30
101.0
100.5
100.0
Without Load
99.5
99.0
10K Load
98.5
TA = 25°C
98.01 2 3 4 5 6 7 8 9 10 11 12
INPUT VOLTAGE VIN (V)
FIGURE 2-5:
Voltage Conversion.
100
80 VIN = 2.5V
60
VIN = 5.5V
40
IOUT = 20mA
TA = 25°C
10
1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10.5 11.5 12
SUPPLY VOLTAGE (V)
FIGURE 2-3:
Output Source Resistance
vs. Supply Voltage.
20
0
-40 -20
0
20 40 60 80 100
TEMPERATURE (°C)
FIGURE 2-6:
Output Source Resistance
vs. Temperature.
2001-2015 Microchip Technology Inc.
DS20001467C-page 5

5 Page





TC7660S arduino
5.6 Combined Negative Voltage
Conversion and Positive Supply
Multiplication
Figure 5-7 combines the functions shown in Figure 5-3
and Figure 5-6 to provide negative voltage conversion
and positive voltage multiplication simultaneously. For
example, this approach would be suitable for generat-
ing +9V and -5V from an existing +5V supply. In this
instance, capacitors C1 and C3 perform the pump and
reservoir functions, respectively, for the generation of
the negative voltage, while capacitors C2 and C4 are
pump and reservoir, respectively, for the multiplied pos-
itive voltage. There is a penalty in this configuration
which combines both functions, however, in that the
source impedances of the generated supplies will be
somewhat higher due to the finite impedance of the
common charge pump driver at pin 2 of the device.
18
27
3 TC7660S 6
+C1 4
5
+
C2
V+
VOUT
= -V+
D1 + C3
VOUT =
D2 (2 V+) - (2 VF)
+
C4
FIGURE 5-7:
Combined Negative
Converter and Positive Multiplier.
5.7 Efficient Positive Voltage
Multiplication/Conversion
Since the switches that allow the charge pumping
operation are bidirectional, the charge transfer can be
performed backwards as easily as forwards.
Figure 5-8 shows a TC7660S transforming -5V to +5V
(or +5V to +10V, etc.). The only problem is that the
internal clock and switch-drive section will not operate
until some positive voltage has been generated. An ini-
tial inefficient pump, as shown in Figure 5-7, could be
used to start this circuit up, after which it will bypass the
other (D1 and D2 in Figure 5-7 would never turn on), or
else the diode and resistor shown dotted in Figure 5-8
can be used to “force” the internal regulator on.
TC7660S
VOUT = -V-
C1 +
10 µF
18
27
3 TC7660S 6
45
1 M
V- input
+
10 µF
FIGURE 5-8:
Conversion.
Positive Voltage
5.8 Voltage Splitting
The same bidirectional characteristics used in
Figure 5-8 can also be used to split a higher supply in
half, as shown in Figure 5-9. The combined load will be
evenly shared between the two sides. Once again, a
high value resistor to the LV pin ensures start-up.
Because the switches share the load in parallel, the
output impedance is much lower than in the standard
circuits, and higher currents can be drawn from the
device. By using this circuit, and then the circuit of
Figure 5-3, +15V can be converted (via +7.5V and -7.5V)
to a nominal -15V, though with rather high series
resistance (~250).
+
RL1 50μF
VOUT =
V + V
2
RL2
50μF
+
100 kΩ
50μF
+
V+
18
27
3 TC7660S 6
45
1 MΩ
V
FIGURE 5-9:
Splitting a Supply in Half.
5.9 Negative Voltage Generation for
Display ADCs
The TC7106 is designed to work from a 9V battery.
With a fixed power supply system, the TC7106 will
perform conversions with input signal referenced to
power supply ground.
5.10 Negative Supply Generation for
4½ Digit Data Acquisition System
The TC7135 is a 4½ digit ADC operating from ±5V
supplies. The TC7660S provides an inexpensive -5V
source. (See AN16 and AN17 for TC7135 interface
details and software routines.)
2001-2015 Microchip Technology Inc.
DS20001467C-page 11

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