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PDF BD3951F Data sheet ( Hoja de datos )
| Número de pieza | BD3951F | |
| Descripción | System Regulator | |
| Fabricantes | ROHM Semiconductor | |
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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 -40℃ to +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
1 page  
BD3951F
●Input/Output terminal Circuit
SIN(2pin)
Vcc
SIN(2pin)
200k
RADJ(3pin)
Vcc
RADJ(3pin)
340
RES(6pin)
OUT(8pin)
20k
RES(6pin)
SOUT(7pin)
OUT(8pin)
20k
SOUT(7pin)
Technical Note
CT(4pin)
300k
4.1k
Vcc
CT(4pin)
OUT(8pin)
Vcc
1260k
420k
OUT(8pin)
Fig.15
●How to set RESET delay time using CT terminal capacitor
There are three factors to define the RESET delay time TdLH. External capacitor value Cct of the CT terminal, internal
charge resistor and internal reference voltage. RESET delay time is approximately described as below equation.
(TYP): TdLH≒300K × Cct(sec)
Internal charge resistor 300k has some inaccuracy. The deviation of this inaccuracy is shown in Fig. 16. However, as
TdLH delay time may be effected by application board, application board test is recommended to select the right Cct.
10,000
1,000
100
(MAX): TdLH≒530k×Cct
(TYP): TdLH≒300k×Cct
(MIN): TdLH≒170k×Cct
10
1
0.01
0.1 1
Cct[μF]
Fig.16
10
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
5/9
2009.07 - Rev.A
5 Page 
Datasheet
Precautions Regarding Application Examples and External Circuits
1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the
characteristics of the Products and external components, including transient characteristics, as well as static
characteristics.
2. You agree that application notes, reference designs, and associated data and information contained in this document
are presented only as guidance for Products use. Therefore, in case you use such information, you are solely
responsible for it and you must exercise your own independent verification and judgment in the use of such information
contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses
incurred by you or third parties arising from the use of such information.
Precaution for Electrostatic
This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper
caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be
applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron,
isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control).
Precaution for Storage / Transportation
1. Product performance and soldered connections may deteriorate if the Products are stored in the places where:
[a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2
[b] the temperature or humidity exceeds those recommended by ROHM
[c] the Products are exposed to direct sunshine or condensation
[d] the Products are exposed to high Electrostatic
2. Even under ROHM recommended storage condition, solderability of products out of recommended storage time period
may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is
exceeding the recommended storage time period.
3. Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads
may occur due to excessive stress applied when dropping of a carton.
4. Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of
which storage time is exceeding the recommended storage time period.
Precaution for Product Label
QR code printed on ROHM Products label is for ROHM’s internal use only.
Precaution for Disposition
When disposing Products please dispose them properly using an authorized industry waste company.
Precaution for Foreign Exchange and Foreign Trade act
Since our Products might fall under controlled goods prescribed by the applicable foreign exchange and foreign trade act,
please consult with ROHM representative in case of export.
Precaution Regarding Intellectual Property Rights
1. All information and data including but not limited to application example contained in this document is for reference
only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any
other rights of any third party regarding such information or data. ROHM shall not be in any way responsible or liable
for infringement of any intellectual property rights or other damages arising from use of such information or data.:
2. No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any
third parties with respect to the information contained in this document.
Other Precaution
1. This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM.
2. The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written
consent of ROHM.
3. In no event shall you use in any way whatsoever the Products and the related technical information contained in the
Products or this document for any military purposes, including but not limited to, the development of mass-destruction
weapons.
4. The proper names of companies or products described in this document are trademarks or registered trademarks of
ROHM, its affiliated companies or third parties.
Notice - GE
© 2014 ROHM Co., Ltd. All rights reserved.
Rev.002
11 Page | ||
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