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BD4201FV
Regulators
Battery Backup IC
BD4201FV
BD4201FV is a battery backup IC. Switch that detect battery voltage and switch into back up power supply and 3-channel regulator are incorporated into a single chip. Current consumption is 15A (Max.). This IC is perfect for portable appliances.
Applications Portable video, Digital camera
External dimensions (Unit : mm)
3.00.2
8 5
Features 1) Low quiescent current Normal operation < 15.0A Max. Backup mode < 2.1A Max. 2) 3 high accurate voltage regulators 3) Low dropout voltage, and high accurate voltage detectors (CS, RESET) 4) Control circuit; Backup 5) Special sequence; For shifting to the backup mode. It need to make main battery over +Vdet1 once.
6.40.3 4.40.2
1
4
0.150.1 0.1
1.150.1 0.1
0.220.1 0.65
(0.52)
SSOP-B8
Absolute maximum ratings (Ta=25C)
Parameter Main power supply input Voltage Back up power supply input Voltage CS output Voltage RESRT output Voltage Power dissipation Operating temperature Storage temperature
+ +
Symbol Vin Vbat Vcs VRES Pd Topr Tstg
Limits 15 15 15 15 350 -30 to +85 -40 to +125
Unit V V V V mW C C
70mm 70mm 1.6mm Glass fiber basis subtract 3.5mW / C when over 25 C
Commendable operating status (Ta=25C)
Parameter Power supply range Backup power supply range Load current range1 Load current range2 Load current range3 Symbol Vin Vbat Iro Iout Ich Min. 2.0 2.0 0 0 0 Typ. Max. 15.0 15.0 20.0 60.0 20.0 Unit V V mA mA mA
0.3Min.
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Regulators
Block diagram
Vout
Vin M1 RESET Voltage detector
Vbat
REG2
Vch
Fig. 1
Vsw1 Detection circuit DELAY REG1
Q R S Q R S
CS
CS Voltage detection
REG3
RESET
Switch control circuit
Vsw2 Detection circuit
Vro
Vss
BD4201FV
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BD4201FV
Regulators
Circuit around pin
Pin No. 1 Pin Name Vss Function Ground Pin Pin No. 2 Pin Name Vch Vch Vss Function Regulator 3 output Pin Vin
3
Vbat Vbat
Back up power supply input Pin
4
CS CS
CS voltage detector output Pin
5
RESET
RESET voltage detector output Pin
6
Vout
Regulator2 output Pin
Vin RESET Vout
Vbat
7
Vin
Main power supply input Pin
8
Vro Vin
Regulator1 output Pin Vin
Vin Vro
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BD4201FV
Regulators
Electrical characteristics (Unless otherwise specified Vin=6V, Ta=25C)
Parameter Symbol lin1 lbat1 lbat2 Vro Vdif1 Vlo1 Vli1 Vout Vdif2 Vlo2 Vli2 Vch Vdif3 Vlo3 Vli3 -Vdet1 +Vdet1 -Vdet2 +Vdet2 +Tdet2 Vopr lcss lcst lres lrel Vsw1 Vsw2 IIek Rsw Min. - - - 2.93 - - - 2.93 - - - 3.32 - - - 3.235 3.320 2.156 2.232 200 2.0 250 - 150 - 2.822 2.79 - - Typ. 10 0.0 1.5 3.00 0.1 30 50 3.00 0.25 30 60 3.30 0.1 30 50 3.300 3.400 2.200 2.312 300 - 500 - 300 - 2.89 2.85 - 30 - - 0.1 - 0.1 2.958 2.91 1 60 Max. 15 0.5 2.1 3.07 0.35 100 100 3.07 0.35 110 110 3.38 0.35 110 110 3.365 3.480 2.244 2.391 Units A A A V V mV mV V V mV mV V V mV mV V V V V S V A A A A V V A Vin or Vbat Vcs=0.5V, Vin=Vbat=2.0V Vcs=15V, Vin=15V Vreset=0.5V, Vin=Vbat=2.0V Vreset=15V, Vin=15V Vbat=2.8V Vbat=3V Vin=3.6V, Vbat=0V Vin=OPEN, Vbat=3V, Iout=10~500A Vout voltage detection Vin=3.6V Conditions No load No load No load
[General spec]
Main circuit current1 Backup circuit current1 Backup circuit current2 Vin=3.6V Vbat=3V Vin : Open Vbat=3V Vin=7.2V, lro=3mA lro=3mA Vin=7.2V, lro=100A20mA Vin=410V, lro=3mA Vin=7.2V, lout=23mA lout=23mA Vin=7.2V, lout=100A60mA Vin=410V, lout=23mA Vin=7.2V, lch=3mA lch=3mA Vin=7.2, Ich=100A20mA Vin=410V, lch=3mA Vin voltage detection
[Regulator1]
Output voltage 1 Dropout voltage 1 Load regulation 1 Linc regulation 1
[Regulator2]
Output voltage 2 Dropout voltage 2 Load regulation 2 Linc regulation 2 [Regulator3] Output voltage 3 Dropout voltage 3 Load regulation 3 Linc regulation 3 [Voltage detect block] CS detect voltatge CS release voltage RESET detect voltage RESET release voltage RESET release delay time Low operating voltage CS sink current CS leak current RESET sink current RESET leak curent [Switch control block] Switch voltage CS no output voltage Vbat switch leak current Vbat switch resistor
This product is not designed for protection against radioactive rays.
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BD4201FV
Regulators
Measurement circuit
1 Vss
Vro
8
10F V
V5 a
SW7 b Iro
SW1 a Ich
2 Vch
b V V1 10F
Vin
7
SW6 a A I1 b
3 Vbat
SW2 a A I2 b
Vout 6
10F
SW5 V V4 a bcd A I6
4
SW3 b a A I3 V V2
CS
RESET 5
V3 V I4 ab A SW4
Iout
Fig.2
Application circuit
1 Vss
Vro 8
10F
Vro
Vch 10F
2 Vch
Vin 7
6V
Vout 100k CS
3
3V
Vbat
Vout 6
22F
Vout 100k
4
0.01F
CS
RESET 5
0.01F
RESET
Fig.3
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BD4201FV
Regulators
Note for use 1. The application circuit is recommended for use. Make sure to confirm the adequacy of the characteristics. When using the circuit with changes to the external circuit constants, make sure to leave an adequate margin for external components including static and transitional characteristics as well as dispersion of the IC. Operation supply voltage range The circuit functionality is guaranteed within the operation of ambient temperature range, as long as it is within the operation supply voltage range. The standard of electrical characteristic values cannot be guaranteed at other voltages in the operating range, however, the variation will be small. The regulator output circuit of this IC does not include protect circuit for the unusual situations such as over voltage current protection, short detect circuit and thermal shut-down circuit. Therefore, this IC might be broken down when it is loaded exceeding the package power, or when it is shorted. To design application circuit, please deal it with enough consideration. Oscillation stopper of output and bypass capacitor Please put into capacitor to stop oscillation between output pin and GND. It has a possibility of oscillation if capacitance is changed due to temperature range, and it recommends to use small tantalum electrolytic capacitor of equivalents serial resistor (ESR). If extremely big capacitor is used, it may have a case to occur oscillation of low frequency. Please confirm this point. And it recommend to put into bypass capacitor into the nearest position between input pin and GND. For the grounding shown in the application circuit, wire every ground to GND terminal in a short pattern arrangement to avoid electrical disturbance. This product is produced with strict quality control, but might be destroyed in using beyond absolute maximum ratings is considered. Open IC destroyed a failure mode cannot be defined (I like short mode, or open mode). Therefore, physical security countermeasure, like fuse, is to be given when a specific mode to be beyond absolute maximum ratings is considered. Mal-function may happen when the device is used in the strong electromagnetic field. Recommended to put DIODE for protection purpose in case of output pin connected with large load of inpedance or reserve current occurred at initial and output off.
2.
3.
4.
5. 6.
7. 8.
(Example)
OUTPUT
PIN
9.
This IC is monolithic IC which (as shown in Figure-4) has P+ isolation in the P substrate and between the various pins. A P-N junction is formed from this P layer and N layer of each pin. For example, the relation between each potentials is as follows; (When GND > pinB and GND > pinA, the P-N junction operates as parasitic diode.) (When > pinB > GND > pinA, the P-N junction operates as parasitic transistor.) Parasitic diodes can occur inevitably in the structure of the IC. The operation of parasitic diodes can result in mutual interference among circuits as well as operation faults and physical damage. Accordingly, Please do not use methods by which parasitic diode operate, such as applying a voltage that is lower than the GND (P substrate) voltage to an input pin.
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BD4201FV
Regulators
Transistor (NPN) Resistance (Pin A) (Pin B) C E
~
N P+ N N P substrate P substrate Parasitic diode Parasitic diode or transistor N N P P P N N GND P P+
(Pin A)
(Pin B)
~
parasitic diode
~
GND Parasitic diode or transistor
B
GND
Fig.4 Simplified structure of IC
Pin layout
Vss Vch Vbat CS
1 2 3 4
8 7 6 5
Fig. 5
~
C
B
Vro Vin Vout RESET
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BD4201FV
Regulators
Electrical characteristic curves
(mW) 500
Power dissipation
400 300 200 100
25
50
75 100 Temperature
125
150 ( C)
Fig.6 Power dissipation curve
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Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product described in this document are for reference only. Upon actual use, therefore, please request that specifications to be separately delivered. Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. Any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by ROHM CO., LTD. is granted to any such buyer. Products listed in this document use silicon as a basic material. Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). Should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of with would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. About Export Control Order in Japan Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control Order in Japan. In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause) on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
Appendix1-Rev1.0

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