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PDF TC7660 Data sheet ( Hoja de datos )
| Número de pieza | TC7660 | |
| Descripción | Charge Pump DC-to-DC Voltage Converter | |
| Fabricantes | Microchip Technology | |
| 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 20 Páginas | ||
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TC7660
Charge Pump DC-to-DC Voltage Converter
Features
• Wide Input Voltage Range: +1.5V to +10V
• Efficient Voltage Conversion (99.9%, typ)
• Excellent Power Efficiency (98%, typ)
• Low Power Consumption: 80 µA (typ) @ VIN = 5V
• Low Cost and Easy to Use
- Only Two External Capacitors Required
• Available in 8-Pin Small Outline (SOIC), 8-Pin
PDIP and 8-Pin CERDIP Packages
• Improved ESD Protection (3 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
Functional Block Diagram
Package Types
PDIP/CERDIP/SOIC
NC 1
CAP+ 2
GND 3
CAP- 4
TC7660
8 V+
7 OSC
6
LOW
VOLTAGE (LV)
5 VOUT
General Description
The TC7660 device is a pin-compatible replacement
for the industry standard 7660 charge pump voltage
converter. It converts a +1.5V to +10V input to a corre-
sponding -1.5V to -10V output using only two low-cost
capacitors, eliminating inductors and their associated
cost, size and electromagnetic interference (EMI).
The on-board oscillator operates at a nominal fre-
quency of 10 kHz. Operation below 10 kHz (for lower
supply current applications) is possible by connecting
an external capacitor from OSC to ground.
The TC7660 is available in 8-Pin PDIP, 8-Pin Small
Outline (SOIC) and 8-Pin CERDIP packages in
commercial and extended temperature ranges.
V+ CAP+
82
OSC 7
LV 6
RC
Oscillator
2
Inntteerrnnaal l
VVooltltaaggee
RReegguulalatotror
TC7660
Voltage
Level
Translator
3
GND
4 CAP-
5 VOUT
Logic
Network
2002-2011 Microchip Technology Inc.
DS21465C-page 1
1 page  
TC7660
3.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
Pin No.
1
2
3
4
5
6
7
8
PIN FUNCTION TABLE
Symbol
Description
NC
CAP+
GND
CAP-
VOUT
LV
OSC
V+
No connection
Charge pump capacitor positive terminal
Ground terminal
Charge pump capacitor negative terminal
Output voltage
Low voltage pin. Connect to GND for V+ < 3.5V
Oscillator control input. Bypass with an external capacitor to slow the oscillator
Power supply positive voltage input
3.1 Charge Pump Capacitor (CAP+)
3.5 Low Voltage Pin (LV)
Positive connection for the charge pump capacitor, or
flying capacitor, used to transfer charge from the input
source to the output. In the voltage-inverting configura-
tion, the charge pump capacitor is charged to the input
voltage during the first half of the switching cycle. Dur-
ing the second half of the switching cycle, the charge
pump capacitor is inverted and charge is transferred to
the output capacitor and load.
It is recommended that a low ESR (equivalent series
resistance) capacitor be used. Additionally, larger
values will lower the output resistance.
3.2 Ground (GND)
Input and output zero volt reference.
3.3 Charge Pump Capacitor (CAP-)
Negative connection for the charge pump capacitor, or
flying capacitor, used to transfer charge from the input
to the output. Proper orientation is imperative when
using a polarized capacitor.
The low voltage pin ensures proper operation of the
internal oscillator for input voltages below 3.5V. The low
voltage pin should be connected to ground (GND) for
input voltages below 3.5V. Otherwise, the low voltage
pin should be allowed to float.
3.6 Oscillator Control Input (OSC)
The oscillator control input can be utilized to slow down
or speed up the operation of the TC7660. Refer to
Section 5.4 “Changing the TC7660 Oscillator Fre-
quency”, for details on altering the oscillator
frequency.
3.7 Power Supply (V+)
Positive power supply input voltage connection. It is
recommended that a low ESR (equivalent series resis-
tance) capacitor be used to bypass the power supply
input to ground (GND).
3.4 Output Voltage (VOUT)
Negative connection for the charge pump output
capacitor. In the voltage-inverting configuration, the
charge pump output capacitor supplies the output load
during the first half of the switching cycle. During the
second half of the switching cycle, charge is restored to
the charge pump output capacitor.
It is recommended that a low ESR (equivalent series
resistance) capacitor be used. Additionally, larger
values will lower the output ripple.
2002-2011 Microchip Technology Inc.
DS21465C-page 5
5 Page 
TC7660
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2002-2011 Microchip Technology Inc.
DS21465C-page 11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet TC7660.PDF ] | |
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