AN7703 View Datasheet(PDF) - Panasonic Corporation
Part Name
Description
Manufacturer
AN7703 Datasheet PDF : 21 Pages
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Voltage Regulators
AN7700, AN7700F, AN7700SP Series
s Usage Notes
1. Input short-circuit protection circuit
When the DC input pin (pin1) and the ground pin
(pin2) of our conventional three-pin regulators (AN7800
series, etc.) were short-circuited at normal use condi-
tions in some cases, the voltage of the output pin (pin3)
becomes higher than that of the DC input pin and elec-
trons charged in the output capacitor COUT flow into the
input side, resulting in break of the element.
VIN
In those cases, it was necessary for you to connect a
general silicon diode as shown in the figure on the right.
In the AN7700/AN7700F/AN7700SP series, however,
it is not necessary to connect the protection diode be-
cause these series have a built-in protection circuit to
safeguard the element from discharge current.
Not required
1
3
CIN
2
0.33 µF
VOUT
COUT
33 µF
2. Capacitor for external compensation
To maintain the stability, insert a 33-mF capacitor as
close to pin 3 and pin 2 as possible. In case of using at low
temperature, decrease in capacity of the aluminum elec-
trolytic capacitor and increase of ESR of this capacitor
may lead to oscillation.
In the AN7700/AN7700F/AN7700SP series, for the
output capacitor COUT , it is recommended to use an
aluminum electrolytic capacitor or tantalum capacitor
whose equivalent series resistance (ESR) has the tem-
perature characteristic within the recommended area
shown on the right.
Output capacitor ESR
(Equivalent series resistance) Ta = 25°C
10 000
1 000
VIN = Refer to the
table below.
IOUT = 0 A to 1 A
COUT = 33 µF
100
10 Ω (typ.)
10
Usable range
1.0
1
2
3
CIN
0.33 µF
VIN IOUT
GND
COUT
33 µF
ESR
3. Others
Cautions for the input voltage that exceeds the
operating supply voltage:
1) The overvoltage protection is activated with the ASO
protection circuit when VIN = 30 V is applied, and
the output shuts down occasionally. (3-V type to
10-V type)
2) Please note that at IOUT < 2 mA, the output voltage
rises and may exceed the maximum of the operation
range. (12-V type to 24-V type)
0.1
0.01
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4
IOUT (A)
Part No.
AN7703/F
AN77033SP
AN77035SP
AN7704/F
AN7705/F/SP
AN7706/F/SP
AN7707/F/SP
AN7708/F/SP
AN7709/F/SP
AN7710/F/SP
AN7712/F/SP
AN7715/F/SP
AN7718/F
AN7720/F
AN7724/F
VIN
4 V to 14 V
4.3 V to 14 V
4.5 V to 14 V
5 V to 15 V
6 V to 16 V
7 V to 17 V
8 V to 18 V
9 V to 19 V
10 V to 20 V
11 V to 21 V
13 V to 23 V
16.5 V to 26.5 V
19.5 V to 29.5 V
21.5 V to 29.5 V
25.5 V to 29.5 V
19
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