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Publication date: October 2008 SDB00163BEB
DATA SHEET
AN34070A
Part No.
Package Code No. SSMINI-5DA
AN34070A
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Contents
Overview ………………………………………………….…………………………………………………………. 3
Features ………………………………………………….…………………………………………………………. 3
Applications ……….………………………………………………………………………………………………… 3
Package ……………………………………………………………………………………………………………. 3
Type …………………………………...……………………………………………………………………………. 3
Application Circuit Example (Block Diagram) ….……………………………………………………………… 4
Pin Descriptions …………………..………………………………………………………………………………. 4
Absolute Maximum Ratings ……………………..……………..…………………………………………………. 5
Operating Supply Voltage Range …………..……………………………………………………………………. 5
Electrical Characteristics ………………….………………….………………….………………………………. 6
Electrical Characteristics (Reference values for design) ………………….………………….………………. 6
Technical Data …………………………………….………………….……………………………………………. 8
•I/O block circuit diagrams and pin function descriptions …………........……………………………………. 8
•Input and output timing chart …………................................…….…………………………………………. 9
•PD⎯Tadiagram …………........………….………………….…………………………………………………. 10
Usage Notes ……….…..…………………….………………….…………………………………………………. 11
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AN34070A
Integrated load switch with soft start implemented
Overview
The AN34070A is a low power load switch with output short to ground protection.
Features
yMiniature package
yLow ON-resistance of 0.45 Ω
yOutput short to ground protection
ySoft start capability controllable by external capacitor
Applications
yMemory card slot for camera
Package
y5 pin plastic small surface mount package (SMINI type)
Type
yBi-CMOS IC
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Application Circuit Example (Block Diagram)
RLOAD = 6 Ω
R1
300 Ω
on / off
control
Q1
Q2
CSS = 0.1 μF
3.3 V 3.3 V
CLOAD = 1 μF
1
5
3
4
2
Vin
EN
SS
GND
Vout
Pin Descriptions
Input voltage of 3.3 V typicalInputEN5
Connect to soft start capacitorInputSS4
Signal outputOutputVout3
Signal groundGroundGND2
Input voltage of 3.3 V typicalPower supplyVin1
DescriptionTypePin namePin No.
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Absolute Maximum Ratings
Operating Supply Voltage Range
*1V3.8VCC
Supply voltage1
Storage temperature
Operating ambient temperature
Power dissipation
Supply current
Parameter
*3
°C
–55 to +125Tstg
5
*3
°C
–25 to +75Topr
4
*2mW60PD
3
⎯
mA500ICC
2
NoteUnitRatingSymbolA No.
2.7 to 3.6
VCC
Range
⎯
VSupply voltage range
NoteUnitSymbolParameter
Note) *1: The range under absolute maximum ratings, power dissipation.
*2: Power dissipation shows the value of only package at Ta= 75°C.
When using this IC, refer to the •PD–T
adiagram in the Technical Data and use under the condition not exceeding the allowable value.
*3: Expect for the storage temperature and operating ambient temperature, all ratings are for Ta= 25°C.
Note) The values under the condition not exceeding the above absolute maximum ratings and the power dissipation.
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⎯
0.45RON Ω
0.6—
IL= 500 mA, VOUT ≥VIN – 0.3 V
ON resistance
⎯
V
⎯⎯
2
VOUT ≥3 V
VENH
EN high threshold4
⎯
V0.5
⎯⎯VOUT ≤0.2 V
VENL
EN low threshold5
⎯Ω
390330270No loadRDIS
Discharge impedance6
3
⎯
A
⎯⎯
0.5VIN –V
OUT = 0.3 VIL
Load current2
EN = 0 V, No load
OFF characteristic
⎯μA
1
⎯⎯
ISTB
Standby current7
ON characteristic
⎯μA
100
⎯⎯
No loadIQ
Quiescent current1
Limits
Typ Unit
Max Note
Min
ConditionsSymbolParameter
B
No.
⎯
ms
⎯
1
⎯⎯
tD
Soft start delay9
Soft start characteristic
⎯
ms
⎯
1
⎯⎯
tR
Soft start8
Limits
Typ Unit
Max Note
Min
ConditionsSymbolParameter
B
No.
Electrical Characteristics (Reference values for design) at CSS = 0.1 μF, RLOAD = 6 Ω, VIN = EN = 3.3 V
Note) Ta=25°C±2°C unless otherwise specified.
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.
Electrical Characteristics at CSS = 0.1 μF, RLOAD = 6 Ω, VIN = EN = 3.3 V
Note) Ta=25°C±2°C unless otherwise specified.
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Electrical Characteristics (Reference values for design) at CSS = 0.1 μF, RLOAD = 6 Ω, VIN = EN = 3.3 V
(continued)
Note) Ta=25°C±2°C unless otherwise specified.
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.
Soft start characteristic with soft start capacitor
Note) Δt = Time delay between VCC (= Vin) and EN. (eg. VCC have to be on first before EN)
Minimum recommended time for Δt is 20 ms in order to accommodate 2 μF of soft start capacitor.
It is possible to reduce Δt to 1 ms with 0.1 μF of soft start capacitor.
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To provide soft start characteristic to the
output pin.
To be connected to external capacitor to
ground.
Typical value of capacitor is 0.1 μF.
to 42 kΩ
(when EN is
High)
SS4
Output of the IC.
To be connected to external load.
to 330 Ω
(Discharge
impedance)
Vout3
IC ground.—GND2
EN is enable signal.
To provide control to the output signal.
—
EN
(Typ. 3.3 V)
5
Power supply of the IC.
To provide current for the load.
—
Vin
(Typ. 3.3 V)
1
Impedance DescriptionInternal circuit
Waveform
and voltage
Pin
No.
3Vout
300
Control
Circuit
Vin 1
GND 2
Vin
GND
1
2
GND 2
SS
4
40k
Control
Circuit
2k
GND 2
Vin 1
Vin
EN
1
5
GND 2
Technical Data
•I/O block circuit diagrams and pin function descriptions
Note) The characteristics listed below are reference values based on the IC design and are not guaranteed.
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Technical Data (continued)
•Input and output timing chart
Soft start
Soft start delay
tR
tD
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Technical Data (continued)
•PD⎯Tadiagram
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Usage Notes
1. Pay attention to the PCB (Printed-Circuit-Board) pattern layout in order to prevent damage due to short circuit between pins. In
addition, for the pin configuration, refer to the pin functional description diagram.
2. Unless specified in the product specifications, make sure that negative voltage or excessive voltage are not applied to the pins
because the device might be damaged.
3. Carry out visual inspection on the PCB (Printed-Circuit-Board) before applying the power, otherwise damage might happen due
to problems such as solder-bridge between the pins of the semiconductor device. Also, perform a full technical verification on the
assembly quality, because the same damage may happen due to conductive substances, such as solder ball, that adhere to the LSI
during transportation.
4. ake notice in the use of this product that it might be damaged or occasionally emit smoke when an abnormal state occurs such as
output pin-Vcc short, output-to-output-pin short (load short), pin to pin short or pin to pin leakage current. (And safety measures
such as an installation of fuses are recommended because the extent of the above-mentioned damage and smoke emission will
depend on the current capability of the power supply.)
5. Carry out thermal design with sufficient margin such that the power dissipation will not be exceeded under the necessary
conditions of power supply voltage, load impedance and ambient temperature
6. When carrying out derivative product expansion or when the product is going to be used in a new set, verify the safety including
the long-term reliability for each set.
7. Check the risk that is caused by the failure of external components.
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.
(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 prod-
ucts may directly jeopardize life or harm the human body.
– Any applications other than the standard applications intended.
(4)The products and product specifications described in this book are subject to change without notice for modification and/or im-
provement. 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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