參數(shù)資料
型號(hào)： TC7660MJAG
元件分類： 穩(wěn)壓器
英文描述： SWITCHED CAPACITOR REGULATOR, 10 kHz SWITCHING FREQ-MAX, CDIP8
封裝： CERDIP-8
文件頁(yè)數(shù)： 14/18頁(yè)
文件大?。?/td> 396K
代理商： TC7660MJAG
2002 Microchip Technology Inc.
DS21465B-page 5
TC7660
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
PIN FUNCTION TABLE
3.1
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 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.
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.
3.5
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.
3.6
Oscillator Control Input (OSC)
The oscillator control input can be utilized to slow down
or speed up the operation of the TC7660. Refer to
“Changing
the
TC7660
Oscillator
Frequency”, 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).
Pin No.
Symbol
Description
1
NC
No connection
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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