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Part No.
Publication date: October 2008
AN7712SP
Package Code No.
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DATA SHEET
SP-3SUA
SFF00078BEB
1
AN7712SP
Contents
Overview ……………………………………………………………………………………………………………. 3
Features …………………………………………………………………………………………………………….. 3
Applications ………………………………………………………………………………………………………… 3
Package ……………………………………………………………………………………………………………. 3
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Type …………………………………...……………………………………………………………………………. 3
Block Diagram ………………...……………………………………………………………………………………. 4
Pin Descriptions ……………………………………………………………………………………………………. 5
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Absolute Maximum Ratings ………………………………………………………………………………………. 6
Operating Supply Voltage Range ……………..…………………………………………………………………. 6
Electrical Characteristics …………………………………………………………………………………………. 7
Electrical Characteristics (Reference values for design) ………...…………………………………………..... 8
Technical Data ……………………………………………………………………………………………………… 9
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Usage Notes ……………………………………………………………………………………………………….. 10
SFF00078BEB
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AN7712SP
AN7712SP
3-pin, positive output, low dropout voltage regulator (1.2 A type)
Overview
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AN77xxSP series is suitable for low-voltage, battery driven equipment, and home appliances and industrial equipment with great
fluctuation of the supply voltage.
The output voltage ranges : 3.3 V, 3.5 V, 5 V, 6 V, 7 V, 8 V, 9 V, 10 V, 12 V, and 15 V
The AN7712SP is the 12 V output voltage type in these series.
Features
Applications
y Power supply equipment.
Package
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y Minimum I/O voltage difference: 0.5 V typ.
y On-chip overcurrent limiter
y On-chip thermal protection circuit
y On-chip inrush current protection circuit at the time of input voltage start-up
y On-chip input short-circuit protection circuit
(When the input pin is short-circuited to the ground, the circuit between pins 1 and 3 is shut down to prevent current flow.)
y 3 pin Plastic Surface Mount Power Package (SP Type).
Type
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y Silicon monolithic bipolar IC.
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3
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Voltage reference
Starter
Vref
+
Error amplifier
–
Thermal
protection
1
2
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Output driver
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CIN : 0.33 μF
COUT : 33 μF
int
VIN
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AN7712SP
Block Diagram
Input short-circuit
protection
SFF00078BEB
Pass Tr
Overcurrent
limiter
Inrush current
protection
R1
R2
3
VOUT
COUT
4
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Pin name
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AN7712SP
Pin Descriptions
Type
Description
1
Input
Input
Input pin
2
Common
GND
Ground pin
3
Output
Output
Output pin
SFF00078BEB
5
AN7712SP
Absolute Maximum Ratings
A
No.
Parameter
Symbol
Rating
Unit
Note
Supply voltage
VCC
30
V
*1
2
Supply current
ICC
2.4
A
*2
3
Power dissipation
PD
364.9
mW
*3
4
Operating ambient temperature
Topr
−30 to +85
°C
*4
5
Storage temperature
Tstg
−55 to +150
°C
*4
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1
Note) 1. This IC is not applicable to automotive electronic parts.
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2. *1: The values under the condition not exceeding the above absolute maximum ratings and the power dissipation.
At the application of VCC = 30 V, the overvoltage protection may be operated by the ASO protection circuit, leading to the output shut down.
*2: The current value does not exceed this criterion because of the on-chip current limiter.
*3: The internal circuit shuts off the output when Tj ≥ 150°C (designed value).
The power dissipation shown is the value at Ta = 85°C for the independent (unmounted) IC package without a heat sink.
When using this IC, refer to the y PD – Ta diagram in the Technical Data and use under the condition not exceeding the allowable value.
*4: Except for the power dissipation, operating ambient temperature, and storage temperature, all ratings are for Ta = 25°C
Operating supply voltage range
Parameter
Supply voltage range
Symbol
Range
Unit
Note
VCC
13 to 23
V
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Note) The values under the condition not exceeding the above absolute maximum ratings and the power dissipation.
SFF00078BEB
6
AN7712SP
Electrical Characteristics
Note) Unless otherwise specified, Ta = 25°C±2°C
B
No.
Parameter
Symbol
Conditions
VIN = 13 V, Tj = 25°C
IOUT = 500 mA
Limits
Unit
Note
12.3
6
V
—
Min
Typ
Max
11.6
4
12.0
Output voltage
VOUT
2
Line regulation
REGIN
VIN = 13 V to 23 V
IOUT = 500 mA, Tj = 25°C
—
12
120
mV
—
3
Load regulation
REGLOA
VIN = 13 V, Tj = 25°C
IOUT = 0 mA to 1 200 mA,
—
60
240
mV
—
4
Input dependency of bias current
ΔIbias(IN)
VIN = 13 V to 23 V,
IOUT = 500 mA , Tj = 25°C
—
1
10
mA
—
5
Load dependency of bias current
ΔIbias(LOA)
VIN = 13 V,
IOUT = 0 mA to 1 200 mA,
Tj = 25°C
—
10
50
mA
—
6
Bias current at no load
Ibias
VIN = 13 V, IOUT = 0 mA
—
2.6
5.0
mA
—
7
Bias current
before the regulation starts
Irush
VIN = 10.8 V, IOUT = 0 mA
—
3.0
5.0
mA
—
8
Minimum I/O voltage difference 1
VDIF(min)1
VIN = 10.8 V, IOUT = 500 mA
Tj = 25°C
—
0.4
0.6
V
—
9
Minimum I/O voltage difference 2
VDIF(min)2
VIN = 10.8 V, IOUT = 1 200 mA
Tj = 25°C
—
0.5
1.0
V
—
10
Peak output current 1
IO(peak)1
VIN = 13 V, Tj = 25°C
1.2
1.8
2.4
A
*
11
Ripple rejection ratio
R.R
VIN = 13 V to 15 V,
IOUT = 100 mA, f = 120 Hz
42
62
—
dB
—
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This current exceeds PD(max) because it is a parameter during abnormal (overcurrent) operation. However, normally, it shall conform to
the y PD – Ta diagram in the Technical Data.
Ma
Note) *:
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1
SFF00078BEB
7
AN7712SP
Electrical Characteristics (Reference values for design)
Note) Unless otherwise specified, Ta = 25°C±2°C
The characteristics listed below are reference values for design of the IC and are not guaranteed by inspection.
If a problem does occur related to these characteristics, Panasonic will respond in good faith to user concerns.
B
No.
Symbol
Conditions
IO(peak)2
VIN = 22 V, Tj = 25°C
Peak output current 2
Reference values
Min
—
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1
Parameter
Typ Max
Unit
Note
1.5
—
A
*
Peak output current 3
IO(peak)3
VIN = 27 V, Tj = 25°C
—
1.0
—
A
*
3
Output short-circuit current
IO(short)
VIN = 30 V, Tj = 25°C
The load is shorted.
—
10
—
mA
—
4
Thermal protection operating
temperature
Tj(TH)
5
Output voltage temperature
coefficient
6
Output noise voltage
a
Vno
VIN = 13 V
—
150
—
°C
—
VIN = 13 V
Tj = 25°C to 125°C
—
−40
—
ppm/°C
—
VIN = 13 V, Tj = 25°C
IOUT = 500 mA
f = 10 Hz to 100 kHz
—
158
—
μV[rms]
—
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This current exceeds PD(max) because it is a parameter during abnormal (overcurrent) operation. However, normally, it shall conform to
the y PD – Ta diagram in the Technical Data.
Ma
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2
SFF00078BEB
8
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AN7712SP
Technical Data
y PD — Ta diagram
SFF00078BEB
9
AN7712SP
Usage Notes
1. Input short-circuit protection circuit
When the DC input pin (pin 1) and the ground pin (pin 2) of our conventional three-pin regulators (AN78xx/SP series, etc.)
were short-circuited at normal use conditions in some cases, the voltage of the output pin (pin 3) becomes higher than that of the DC
input pin and electrons charged in the output capacitor COUT flow into the input side, resulting in break of the element.
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In those cases, it was necessary for you to connect a general silicon diode as shown in the figure on the right. In the AN77xxSP
series, however, it is not necessary to connect the protection diode because these series have a built-in protection circuit to safeguard
the element from discharge current.
1
VIN
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Not required
3
CIN
0.33 μF
2
2. Capacitor for external compensation
VOUT
COUT
33 μF
To maintain the stability, insert a 33 μF capacitor as close to pin 3 and pin 2 as possible. In case of using at low temperature,
decrease in capacity of the aluminum electrolytic capacitor and increase of ESR of this capacitor may lead to oscillation.
Output capacitor ESR
(Equivalent series resistance)
Ta = 25°C
VIN = 13 V to 23 V
IOUT = 0 A to 1 A
COUT = 33 μF
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In the AN77xxSP 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 temperature characteristic within the recommended area shown on the
right.
1 IN
CIN
0.33 μF
VIN
2 GND
3 OUT
IOUT
COUT
33 μF
ESR
IOUT (A)
SFF00078BEB
10
Request for your special attention and precautions in using the technical information and
semiconductors described in this book
(1) If any of the products or technical information described in this book is to be exported or provided to non-residents, the laws and
regulations of the exporting country, especially, those with regard to security export control, must be observed.
(2) The technical information described in this book is intended only to show the main characteristics and application circuit examples
of the products. No license is granted in and to any intellectual property right or other right owned by Panasonic Corporation or any
other company. Therefore, no responsibility is assumed by our company as to the infringement upon any such right owned by any
other company which may arise as a result of the use of technical information described in this book.
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(3) The products described in this book are intended to be used for standard applications or general electronic equipment (such as office
equipment, communications equipment, measuring instruments and household appliances).
Consult our sales staff in advance for information on the following applications:
– Special applications (such as for airplanes, aerospace, automobiles, traffic control equipment, combustion equipment, life support
systems and safety devices) in which exceptional quality and reliability are required, or if the failure or malfunction of the products may directly jeopardize life or harm the human body.
– Any applications other than the standard applications intended.
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(4) The products and product specifications described in this book are subject to change without notice for modification and/or improvement. At the final stage of your design, purchasing, or use of the products, therefore, ask for the most up-to-date Product
Standards in advance to make sure that the latest specifications satisfy your requirements.
(5) When designing your equipment, comply with the range of absolute maximum rating and the guaranteed operating conditions
(operating power supply voltage and operating environment etc.). Especially, please be careful not to exceed the range of absolute
maximum rating on the transient state, such as power-on, power-off and mode-switching. Otherwise, we will not be liable for any
defect which may arise later in your equipment.
Even when the products are used within the guaranteed values, take into the consideration of incidence of break down and failure
mode, possible to occur to semiconductor products. Measures on the systems such as redundant design, arresting the spread of fire
or preventing glitch are recommended in order to prevent physical injury, fire, social damages, for example, by using the products.
(6) Comply with the instructions for use in order to prevent breakdown and characteristics change due to external factors (ESD, EOS,
thermal stress and mechanical stress) at the time of handling, mounting or at customer's process. When using products for which
damp-proof packing is required, satisfy the conditions, such as shelf life and the elapsed time since first opening the packages.
(7) This book may be not reprinted or reproduced whether wholly or partially, without the prior written permission of our company.
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