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TC7660SVOA Fiches technique(PDF) 7 Page - Microchip Technology

No de pièce TC7660SVOA
Description  SUPER CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
Download  24 Pages
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Fabricant  MICROCHIP [Microchip Technology]
Site Internet  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC7660SVOA Fiches technique(HTML) 7 Page - Microchip Technology

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 2001-2015 Microchip Technology Inc.
DS20001467C-page 7
TC7660S
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
3.1
Switching Frequency Boost Pin
(Boost)
By connecting the boost pin (pin 1), the switching
frequency of the charge pump is increased from 10 kHz
typical to 45 kHz typical. By connecting the boost pin
(pin1), to the V+ pin (pin 8), the switching frequency of
the charge pump is increased from 10 kHz typical to
45 kHz typical.
3.2
Charge Pump Capacitor (CAP+)
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
configuration, the charge pump capacitor is charged to
the input voltage during the first half of the switching
cycle. During 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.
3.3
Ground (GND)
Input and output zero volt reference.
3.4
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.
3.5
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 capacitor be used.
Additionally, larger values will lower the output ripple.
3.6
Low Voltage Pin (LV)
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.
3.7
Oscillator Control Input (OSC)
The oscillator control input can be utilized to slow down
or speed up the operation of the TC7660S. Refer to
Section 5.4 “Changing the TC7660S Oscillator
Frequency”
, for details on altering the oscillator
frequency.
3.8
Power Supply (V+)
Positive power supply input voltage connection. It is
recommended that a low ESR capacitor be used to
bypass the power supply input to ground (GND).
TABLE 3-1:
PIN FUNCTION TABLE
Pin No.
Symbol
Description
1
BOOST
Switching Frequency boost pin
2CAP+
Charge pump capacitor positive terminal
3
GND
Ground terminal
4CAP-
Charge pump capacitor negative terminal
5VOUT
Output voltage
6
LV
Low voltage pin. Connect to GND for V+ < 3.5V
7
OSC
Oscillator control input. Bypass with an external capacitor to slow the oscillator.
8V+
Power supply positive voltage input


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