TC7660SCPA Microchip Technology, TC7660SCPA Datasheet - Page 5

• Manufacturer Part Number: TC7660SCPA
• Description: IC CHARGE PUMP DC/DC CONV 8-DIP
• Manufacturer: Microchip Technology
• Type: Switched Capacitor (Charge Pump), Invertingr

Specifications of TC7660SCPA

• Package / Case: 8-DIP (0.300", 7.62mm)
• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: -1.5 ~ -12 V
• Current - Output: 20mA
• Frequency - Switching: 10kHz ~ 45kHz
• Voltage - Input: 1.5 ~ 12 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Power - Output: 730mW
• Minimum Operating Temperature: 0 C
• Mounting Style: Through Hole
• Function: Inverting/Step Up
• Output Voltage: - 12 V to - 1.5 V or 3 V to 24 V
• Output Current: 20 mA
• Maximum Operating Temperature: + 70 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

3.0
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
3.1
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
Input and output zero volt reference.
3.3
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
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 Microchip Technology Inc.
Pin No.
1
2
3
4
5
6
7
8
PIN DESCRIPTIONS
Charge Pump Capacitor (CAP
Ground (GND)
Charge Pump Capacitor (CAP
Output Voltage (V
PIN FUNCTION TABLE
Symbol
CAP
CAP
V
GND
OSC
NC
OUT
LV
V
+
+
-
OUT
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
)
+
-
)
)
3.5
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
The oscillator control input can be utilized to slow down
or speed up the operation of the TC7660. Refer to
Section 5.4,
Frequency”, for details on altering the oscillator
frequency.
3.7
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).
Description
Low Voltage Pin (LV)
Oscillator Control Input (OSC)
Power Supply (V
“Changing
the
+
)
TC7660
TC7660
DS21465B-page 5
Oscillator