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BD3951F PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BD3951F
기능 System Regulator
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BD3951F 데이터시트, 핀배열, 회로
Power Management IC Series for Automotive Body Control
Regulator with Voltage Detector IC
BD3951F
No.09039EAT05
Description
BD3951F is a 5V LDO system regulator particularly developed for automotive applications. The output current of the
regulator can be drawn up to 150mA, and it has built-in power-on reset and input voltage sense. This device can withstand
50V surge input voltage as well as wide ambient temperature operations from -40to +125. The adjustable reset delay
time and detection input voltage allow to meet with wide range of design requirements.
Features
1) Micro processor power supply 5.0V, Adjustable Reset, Adjustable Comparator.
2) 5V is Pch DMOS type low drop out voltage regulator. Iomax=150mA.
3) Low ESR capacitor (Ceramic Capacitor) is available for the Output Capacitor.
4) Over Current Protection built in to prevent the destruction of IC.
5) Thermal Shut Down is built in to prevent the heat runaway.
6) VCC absolute Maximum Ratings 36V.
7) Vcc peak input voltage 50V (*1)
8) Small surface mount package SOP8.
Applications
Automotive application (Rain Sensor and Cluster Panel etc.) and all other electronics application.
Absolute Maximum Ratings (Ta=25)
Parameter
Vcc Input Voltage
Out Terminal Voltage
RES Terminal Voltage
Symbol
Vcc
Vout
Vres
Limit
-0.3+36
-0.3+7
-0.3+7
SOUT Terminal Voltage
Vsout
-0.3+7
RES Output Current
Ires 0.2
SOUT Output Current
Isout
2.5
SIN Input Voltage
Vsin
-0.3+36 *3
Power Dissipation
Pd 687 *2
Operating Temperature Range
Topr -40+125
Storage Temperature Range
Tstg -55+150
Vcc Peak Input Voltage
Vccpeak
50*1
*1 tr (rising time) is over 1msec, applied voltage is less than 400msec
*2 Pd is derated at 5.5mW/for temperature above Ta=25, mounted on 70mm×70mm×1.6mm PCB.
*3 Input current from Vcc to SIN PIN has to be equal and less than 5mA when Vcc voltage is less than SIN PIN voltage.
Unit
V
V
V
V
mA
mA
V
mV
V
Operating Conditions (Ta=-40℃~+125)
Parameter
Symbol
Recommended Supply Voltage *4
Operatinal Supply Voltage *5
Vcc
Vcc
Reset Adjustable Range
Vdet
Reset Delay Time Controllable Range
Cct
Vcc Detection Adjustable Range
Vcc
*4 The range within test condition of the electrical characteristics.
*5 The range exceeding the test condition of the electrical characteristics.
Min.
6.0
5.5
4
-
5
Limit
Typ.
13.5
13.5
-
-
-
Max.
20
36
4.7
10
-
Unit
V
V
V
μF
V
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
1/9
2009.07 - Rev.A




BD3951F pdf, 반도체, 판매, 대치품
BD3951F
Block Diagram, Application Circuit, Pin Description
Vcc
1
0.33μF
R2:36k
PreReg
R1:10k
Vref
OUT
8
3.3μF
OUT SOUT RES GND
Technical Note
RADJ 3
VCC
VCC
2
SIN
GND
5
20k
6 RES
CT
4
0.1μF
20k
SOUT
7
Fig.13
Vcc SIN RADJ CT
PIN
Vcc
OUT
CT
SIN
RADJ
External
Component
Capacitor :Cin
Capacitor :Co
Capacitor :Cct
Resistor :R1,R2
Resistor :R3,R4
Fig.14
Value
0.33μF
10mF
3.3μF
2200μF
0.01μF10μF
0100k
0100k
ESR range of the output capacitor Co is 0 (ceramic capacitor) to 100.
VCC must be more than 5V under the condition SIN is used for VCC voltage drop detection.
Ex. Vcc=5.8V detection, Since 1.26V(R1+R2)/R1=5.8V,
R1=10k,R2=36k
Reset detection voltage must be more than 4V under the condition RADJ is used for OUT voltage drop detection.
Ex. OUT=4.5V detection, Since 1.26V(R3+R4)/R3=4.5V,
R3=10k,R4=26k
OUT
(8PIN)
3.3μF
R4=26k
R3=10k
RADJ
(3PIN)
RESET function can be discarded while RADJ terminal pulls up to OUT terminal, which in case RES terminal output “H”.
Battery detection function can be discarded while SIN terminal pulls up to OUT terminal, which in case SOUT terminal output
“H”. 047Kpull up resistors are recommended in both condition. Set application board test is necessary to select the
right pull up resistor value.
Terminal Description
Pin. No
Pin Name
1 Vcc
2 SIN
3 RADJ
4 CT
5 GND
6 RES
7 SOUT
8 OUT
Function
Battery power supply
Battery voltage detection input terminal. Must be connected to OUT terminal while this
function is not employed.
RESET voltage adjustment terminal. Connect to GND in case internal detect voltage is
employed
RESET delay time control terminal
IC GND terminal
RESET output terminal. Built in 20Kpull up.
Battery voltage detection output terminal. Built in 20Kpull up.
5.0V output terminal
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
4/9
2009.07 - Rev.A

4페이지










BD3951F 전자부품, 판매, 대치품
BD3951F
Technical Note
Notes for use
1. This product are produced with strict quality control, but might be destroyed in using beyond absolute maximum ratings.
The destroyed IC failure mode cannot be defined (like Short mode, or Open mode).
Therefore physical safety guard, like fuse, is recommended to prevent unexpected extreme condition which might
beyond absolute maximum ratings.
2. BD3951F can operate within the operating supply voltage range and operating temperature range.
The Limits over the input voltage is not warranted, however electric characteristics curve in operating condition should
be within the expected linearity.
3. GND terminal voltage must be always forced with the lowest voltage among the terminals.
4. Power GND pattern and Small signal GND pattern should be separated each other and is recommended to supply one
point GND on the board to eliminate the surge current influences. External components GND pattern should not be
long to avoid electrical interferences.
5. For thermal design, refer to the thermal de-rating characteristics and be sure to use this IC within the power dissipation
range at any conditions.
6. Short circuits among the output terminals and short circuits between output terminals and VCC/GND terminal due to
metallic foreign particles would result in permanent damage to the device. And this IC’s Pin Assignment is 1pin=Vcc,
5pin=GND. So if this IC is mounted upside down, the device damaged permanently due to the huge current from GND
pin to Vcc pin.
7. The extent electromagnetic condition might cause wrong operation of BD3951F.
8. Note that running set testing procedure using capacitors connected to low-impedance terminals may produce stress on
the IC. Therefore, be certain to use proper discharge procedure before each process of the Testing. To prevent
electrostatic stress in the assembly process, thoroughly ground yourself and any equipment that could sustain ESD
potential, and continue observing ESD-prevention procedures in all handling, transfer and storage operations. Before
attempting to any component to the test system, make certain that the power supply is OFF. Likewise, be sure to turn
the power supply OFF before removing any component connected to the test system.
9. This IC is a Monolithic IC which has P+ isolation in the P substrate. A P-N junction is formed from this P layer and the
N layer produces various types of parasitic devices. Fig. 18 shows parasitic devices around resistor and NPN transistor.
f lower voltages than GND level are applied for A and B terminals, parasitic Di (P-N junction) would ON in both resistor
and NPN transistor examples.
Moreover, in above condition, parasitic NPN transistor which is formed with parasitic Di and adjoined N layer would ON
in NPN transistor example. Parasitic devices are inevitable in the structure of the IC. The operation of parasitic devices
can result in mutual interference among circuits as well as operation faults and physical damage. Accordingly, you
must not use methods by which parasitic diodes operate, such as applying a voltage that is lower than the GND (P
substrate) voltage to an input pin.
Terminal A
Resistor
Terminal B
NPN Transistor
B
CE
P
N
N
P layer
P P
N
Parasitic
GND
P
N
Parasitic
P
N
P layer
GND
P
N
Terminal A
GND
(Terminal B
B
Parasitic
Adjoined N layer
Fig.18 Bipolar Transistor
C
E
GND
Parasitic
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
7/9
2009.07 - Rev.A

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BD3951F

System Regulator

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