BD2046AFJ [ROHM]

2ch Small Current Output USB High Side Switch ICs; 2ch的小电流输出USB高端开关IC
BD2046AFJ
型号: BD2046AFJ
厂家: ROHM    ROHM
描述:

2ch Small Current Output USB High Side Switch ICs
2ch的小电流输出USB高端开关IC

驱动器 MOSFET驱动器 驱动程序和接口 开关 接口集成电路 光电二极管
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中文:  中文翻译
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Power Management Switch IC Series for PCs and Digital Consumer Product  
2ch Small Current Output  
USB High Side Switch ICs  
BD2046AFJ, BD2056AFJ  
No.09029JAT05  
Description  
High side switch for USB is a high side switch having over current protection used in power supply line of universal serial bus  
(USB). Its switch unit has two channels of N-channel power MOSFET. And, over current detection circuit, thermal shutdown  
circuit, under voltage lockout and soft start circuit are built in.  
Features  
1) Dual N-MOS high side switch  
2) Continuous current load 0.25A  
3) Control input logic  
Active-Low : BD2046AFJ  
Active-High : BD2056AFJ  
4) Soft start circuit  
5) Over current detection  
6) Thermal shutdown  
7) Under voltage lockout  
8) Open drain error flag output  
9) Reverse-current protection when switch off  
10) Flag output delay filter built in  
Applications  
USB hub in consumer appliances, Car accessory, PC, PC peripheral equipment, and so forth  
Lineup  
Parameter  
BD2046AFJ  
0.25  
BD2056AFJ  
0.25  
Continuous current load (A)  
Over current detection (A)  
Control input logic  
0.5  
0.5  
Low  
High  
Absolute Maximum Ratings  
Parameter  
Symbol  
VIN  
Limits  
-0.3 to 6.0  
-0.3 to 6.0  
-0.3 to 6.0  
10  
Unit  
V
Supply voltage  
Enable voltage  
/OC voltage  
VEN, V/EN  
V/OC  
V
V
/OC current  
IS/OC  
VOUT  
TSTG  
mA  
V
OUT voltage  
-0.3 to 6.0  
-55 to 150  
560*1  
Storage temperature  
Power dissipation  
°C  
mW  
Pd  
*1  
*
In the case of exceeding Ta = 25°C, 4.48mW should be reduced per 1°C.  
This chip is not designed to protect itself against radioactive rays.  
Operating conditions  
Parameter  
Symbol  
VIN  
Limits  
Unit  
V
Operating voltage  
2.7 to 5.5  
-40 to 85  
Operating temperature  
Continuous output current  
TOPR  
ILO  
°C  
0
to 250  
mA  
www.rohm.com  
2009.05 - Rev.A  
1/13  
© 2009 ROHM Co., Ltd. All rights reserved.  
Technical Note  
BD2046AFJ, BD2056AFJ  
Electrical characteristics  
BD2046AFJ (Unless otherwise specified, VIN = 5.0V, Ta = 25°C)  
Limits  
Parameter  
Symbol  
Unit  
Condition  
Min.  
Typ.  
110  
0.01  
-
Max.  
140  
1
Operating Current  
Standby Current  
IDD  
-
μA  
μA  
V
V/EN = 0V, OUT = OPEN  
V/EN = 5V, OUT = OPEN  
High input  
ISTB  
-
2.0  
-
/EN input voltage  
V/EN  
-
-
0.8  
0.4  
1.0  
0.5  
1
V
Low input  
-
-
V
Low input 2.7VVIN 4.5V  
V/EN = 0V or V/EN = 5V  
I/OC = 5mA  
/EN input current  
I/EN  
V/OC  
IL/OC  
RON  
-1.0  
0.01  
-
μA  
V
/OC output LOW voltage  
/OC output leak current  
ON resistance  
-
-
-
0.01  
100  
μA  
mΩ  
V/OC = 5V  
130  
IOUT = 250mA  
VIN = 5V, VOUT = 0V,  
CL = 100μF (RMS)  
Output current at short  
ISC  
0.3  
0.5  
0.7  
A
Output rise time  
Output turn on time  
Output fall time  
TON1  
TON2  
-
-
1.8  
2.1  
1
10  
20  
ms  
ms  
μs  
μs  
V
RL = 20, CL = OPEN  
TOFF1  
TOFF2  
VTUVH  
VTUVL  
-
20  
Output turn off time  
-
3
40  
2.1  
2.0  
2.3  
2.2  
2.5  
2.4  
Increasing VIN  
Decreasing VIN  
UVLO threshold  
V
BD2056AFJ (Unless otherwise specified, VIN = 5.0V, Ta = 25°C)  
Limits  
Parameter  
Symbol  
Unit  
Condition  
Min.  
Typ.  
110  
0.01  
-
Max.  
140  
1
Operating Current  
Standby Current  
IDD  
-
μA  
μA  
V
VEN = 5V , OUT = OPEN  
VEN = 0V , OUT = OPEN  
High input  
ISTB  
-
2.0  
-
/EN input voltage  
VEN  
-
-
0.8  
0.4  
1.0  
0.5  
1
V
Low input  
-
-
V
Low input 2.7VVIN 4.5V  
VEN = 0V or VEN = 5V  
I/OC = 5mA  
/EN input current  
IEN  
-1.0  
0.01  
-
μA  
V
/OC output LOW voltage  
/OC output leak current  
ON resistance  
V/OC  
IL/OC  
RON  
-
-
-
0.01  
100  
μA  
mΩ  
V/OC = 5V  
130  
IOUT = 250mA  
VIN = 5V , VOUT = 0V,  
CL = 100μF (RMS)  
Output current at short  
ISC  
0.3  
0.5  
0.7  
A
Output rise time  
Output turn on time  
Output fall time  
TON1  
TON2  
-
-
1.8  
2.1  
1
10  
20  
ms  
ms  
μs  
μs  
V
RL = 20, CL = OPEN  
TOFF1  
TOFF2  
VTUVH  
VTUVL  
-
20  
Output turn off time  
-
3
40  
2.1  
2.0  
2.3  
2.2  
2.5  
2.4  
Increasing VIN  
Decreasing VIN  
UVLO threshold  
V
www.rohm.com  
© 2009 ROHM Co., Ltd. All rights reserved.  
2009.05 - Rev.A  
2/13  
Technical Note  
BD2046AFJ, BD2056AFJ  
Measurement circuit  
VDD  
1µF  
VDD  
1µF  
GND  
A
/OC1  
OUT1  
OUT2  
/OC2  
GND  
/OC1  
OUT1  
OUT2  
/OC2  
IN  
IN  
L
R
L
C
VEN  
VEN  
EN1  
EN2  
EN  
EN  
V
EN1  
EN2  
RL CL  
V
Operating current  
10k  
EN, /EN input voltage, Output rise, fall time  
VDD  
OUT  
VDD  
VDD  
I
OUT  
I
10k  
1µF  
1µF  
GND  
GND  
IN  
/OC1  
OUT1  
OUT2  
/OC2  
/OC1  
OUT1  
OUT2  
/OC2  
IN  
OUT  
I
EN  
EN  
EN  
EN  
V
EN1  
EN2  
V
EN1  
EN2  
OUT  
I
V
V
ON resistance, Over current detection  
OC output LOW voltage  
Fig.1 Measurement circuit  
Timing diagram  
BD2046AFJ  
BD2056AFJ  
OFF1  
T
OFF1  
T
ON1  
T
ON1  
T
90%  
90%  
90%  
90%  
OUT  
V
OUT  
V
10%  
10%  
10%  
10%  
ON2  
T
ON2  
T
OFF2  
T
OFF2  
T
EN  
CTRL  
V
50%  
50%  
V
50%  
50%  
Fig.2 Timing diagram  
Fig.3 Timing diagram  
www.rohm.com  
© 2009 ROHM Co., Ltd. All rights reserved.  
2009.05 - Rev.A  
3/13  
Technical Note  
BD2046AFJ, BD2056AFJ  
Reference data  
140  
140  
120  
100  
80  
1.0  
0.8  
0.6  
0.4  
0.2  
0.0  
Ta=25°C  
120  
VIN=5.0V  
Ta=25°C  
100  
80  
60  
40  
20  
0
60  
40  
20  
0
2
3
4
5
6
-50  
0
50  
100  
2
3
4
5
6
SUPPLY VOLTAGE : VIN[V]  
Fig.6 Operating current  
EN,/EN Disable  
AMBIENT TEMPERATURE : Ta[  
]
SUPPLY VOLTAGE : VIN[V]  
Fig.4 Operating current  
EN,/EN Enable  
Fig.5 Operating current  
EN,/EN Enable  
1.0  
0.8  
0.6  
0.4  
0.2  
0.0  
2.0  
1.5  
1.0  
0.5  
0.0  
2.0  
1.5  
1.0  
0.5  
0.0  
VIN=5.0V  
VIN=5.0V  
Ta=25°C  
Low to High  
High to Low  
Low to High  
High to Low  
-50  
0
50  
100  
-50  
0
50  
100  
]
2
3
4
5
6
SUPPLY VOLTAGE : VIN[V]  
AMBIENT TEMPERATURE : Ta[ ]  
AMBIENT TEMPERATURE : Ta[  
Fig.9 EN,/EN input voltage  
Fig.8 EN,/EN input voltage  
Fig.7 Operating current  
EN,/EN Disable  
0.5  
0.4  
0.3  
0.2  
0.1  
0.0  
0.5  
0.4  
0.3  
0.2  
0.1  
0.0  
200  
150  
100  
50  
Ta=25°C  
Ta=25°C  
VIN=5.0V  
0
-50  
0
50  
100  
2
3
4
5
6
2
3
4
5
6
SUPPLY VOLTAGE : VDD[V]  
AMBIENT TEMPERATURE : Ta[  
]
SUPPLY VOLTAGE : VDD[V]  
Fig.10 /OC output LOW voltage  
Fig.11 /OC output LOW voltage  
Fig. ON resistance  
200  
2.0  
2.0  
1.5  
1.0  
0.5  
0.0  
VIN=5.0V  
VIN=5.0V  
Ta=25°C  
150  
100  
50  
1.5  
1.0  
0.5  
0.0  
0
-50  
0
50  
AMBIENT TEMPERATURE : Ta[ ]  
100  
-50  
0
50  
100  
2
3
4
5
6
AMBIENT TEMPERATURE : Ta[  
]
SUPPLY VOLTAGE : VIN[V]  
Fig.14 Output current at shortcircuit  
Fig.15 Output current at short circuit  
Fig.13 ON resistance  
www.rohm.com  
© 2009 ROHM Co., Ltd. All rights reserved.  
2009.05 - Rev.A  
4/13  
Technical Note  
BD2046AFJ, BD2056AFJ  
5.0  
5.0  
4.0  
3.0  
2.0  
1.0  
0.0  
5.0  
4.0  
3.0  
2.0  
1.0  
0.0  
Ta=25°C  
Ta=25°C  
4.0  
VIN=5.0V  
3.0  
2.0  
1.0  
0.0  
2
3
4
5
6
-50  
0
50  
100  
2
3
4
5
6
SUPPLY VOLTAGE : VIN[V]  
SUPPLY VOLTAGE : VIN[V]  
AMBIENT TEMPERATURE : Ta[  
]
Fig.16 Output rise time  
Fig.17 Output rise time  
Fig.18 Output turn on time  
5.0  
4.0  
3.0  
2.0  
1.0  
0.0  
5.0  
4.0  
3.0  
2.0  
1.0  
0.0  
5.0  
Ta=25°C  
VIN=5.0V  
VIN=5.0V  
4.0  
3.0  
2.0  
1.0  
0.0  
-50  
0
50  
100  
2
3
4
5
6
-50  
0
50  
100  
AMBIENT TEMPERATURE : Ta[  
]
SUPPLY VOLTAGE : VIN[V]  
AMBIENT TEMPERATURE : Ta[  
]
Fig.19 Output turn on time  
Fig.20 Output fall time  
Fig.21 Output fall time  
5.0  
4.0  
3.0  
2.0  
1.0  
0.0  
2.5  
2.4  
2.3  
2.2  
2.1  
2.0  
6.0  
5.0  
4.0  
3.0  
2.0  
1.0  
0.0  
VIN=5.0V  
Ta=25°C  
VUVLOH  
VUVLOL  
-50  
0
50  
100  
-50  
0
50  
100  
2
3
4
5
6
AMBIENT TEMPERATURE : Ta[  
]
AMBIENT TEMPERATURE : Ta[  
]
SUPPLY VOLTAGE : VIN[V]  
Fig.24 UVLO threshold voltage  
Fig.23 Output turn off time  
Fig.22 Output turn off time  
1.0  
0.8  
0.6  
0.4  
0.2  
0.0  
-50  
0
50  
100  
AMBIENT TEMPERATURE : Ta[]  
Fig.25 UVLO hysteresis voltage  
www.rohm.com  
2009.05 - Rev.A  
5/13  
© 2009 ROHM Co., Ltd. All rights reserved.  
Technical Note  
BD2046AFJ, BD2056AFJ  
Waveform data  
V/EN  
(1V/div.)  
V/EN  
(5V/div.)  
V/EN  
(5V/div.)  
V/OC  
(5V/div.)  
V/OC  
(5V/div.)  
V/OC  
(1V/div.)  
VIN=5V  
VOUT  
(5V/div.)  
VOUT  
(5V/div.)  
RL=20Ω  
VIN=5V  
CL=200µF  
CL=147µF  
RL=10Ω  
VIN=5V  
CL=100uF  
RL=10Ω  
CL=100uF  
CL=100µ  
CL=47µF  
IOUT  
(0.5A/div.)  
IOUT  
(0.5A/div.)  
IOUT  
(0.1A/div.)  
TIME(1ms/div.)  
TIME(1ms/div.)  
TIME(500us/div.)  
Fig.27 Output fall characteristic  
(BD2056AFJ)  
Fig.26 Output rise characteristic  
(BD2056AFJ)  
Fig.28 Inrush current response  
(BD2056AFJ)  
V/OC  
(5V/div.)  
V/OC  
(5V/div.)  
VOUT  
(5V/div.)  
VOUT  
(5V/div.)  
VIN=5V  
VIN=5V  
IOUT  
(0.5A/div.)  
IOUT  
(0.5A/div.)  
TIME(20ms/div.)  
TIME(2ms/div.)  
Fig.29 Over current response  
Ramped load  
Fig.30 Over current response  
Ramped load  
(BD2056AFJ)  
(BD2056AFJ)  
V/OC  
(5V/div.)  
V/EN  
(5V/div.)  
VIN=2.5V  
CL=100uF  
V/OC  
(1V/div.)  
V/OC  
(5V/div.)  
VOUT  
(5V/div.)  
VOUT  
(5V/div.)  
VOUT  
(1V/div.)  
VIN=5V  
CL=100uF  
VIN=5V  
CL=100uF  
Thermal Shutdown  
TIME (500ms/div.)  
IOUT  
(0.5A/div.)  
IOUT  
(0.5A/div.)  
IOUT  
(0.5A/div.)  
TIME (1ms/div.)  
TIME (2ms/div.)  
Fig.32 Over current response  
Enable to short circuit  
(BD2056AFJ)  
Fig.33 Over current response  
Enable to short circuit  
(BD2056AFJ)  
Fig.31 Over current response  
Enable to short circuit  
(BD2056AFJ)  
V/OC  
(5V/div.)  
V/OC  
(5V/div.)  
VOUT  
(5V/div.)  
VOUT  
(5V/div.)  
IOUT  
(0.5A/div.)  
IOUT  
(0.5A/div.)  
V/OC  
(5V/div.)  
V/OC  
(5V/div.)  
RL=20Ω  
RL=20Ω  
CL=100uF  
CL=100uF  
TIME (1s/div.)  
TIME (1s/div.)  
Fig.34 UVLO response  
Increasing VIN  
Fig.35 UVLO response  
Decreasing VIN  
(BD2056AFJ)  
(BD2056AFJ)  
Regarding the output rise/fall and over current detection characteristics of BD2046AFJ, refer to the characteristic of BD2056AFJ.  
www.rohm.com  
© 2009 ROHM Co., Ltd. All rights reserved.  
2009.05 - Rev.A  
6/13  
Technical Note  
BD2046AFJ, BD2056AFJ  
Block diagram  
/EN1  
EN1  
TSD1  
Delay  
/OC1  
Gate  
Logic1  
Charge  
Pump1  
OCD1  
IN  
OUT1  
OUT2  
GND 1  
IN 2  
8 /OC1  
7 OUT1  
6 OUT2  
5 /OC2  
UVLO  
/EN2  
EN2  
Top View  
Charge  
Pump2  
OCD2  
/EN1  
3
(EN1)  
Gate  
/OC2  
/EN2  
(EN2)  
4
Logic2  
GND  
Delay  
TSD2  
Fig.36 Block diagram  
Fig.37 Pin Configuration  
Pin description  
BD2046AFJ  
Pin No.  
Symbol  
I / O  
I
Pin function  
1
GND  
IN  
Ground.  
Power supply input.  
2
I
I
Input terminal to the switch and power supply input terminal of the internal circuit.  
Enable input.  
Switch on at Low level.  
3, 4  
/EN  
High level input > 2.0V, Low level input < 0.8V.  
Error flag output. Low at over current, thermal shutdown.  
Open drain output.  
5, 8  
6, 7  
/OC  
O
O
OUT  
Switch output.  
BD2056AFJ  
Pin No.  
Symbol  
GND  
I / O  
I
Pin function  
1
Ground.  
Power supply input.  
2
IN  
I
Input terminal to the switch and power supply input terminal of the internal circuit.  
Enable input. Switch on at High level.  
High level input > 2.0V, Low level input < 0.8V  
3, 4  
5, 8  
6, 7  
EN  
I
Error flag output. Low at over current, thermal shutdown.  
Open drain output.  
/OC  
OUT  
O
O
Switch output.  
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2009.05 - Rev.A  
7/13  
© 2009 ROHM Co., Ltd. All rights reserved.  
Technical Note  
BD2046AFJ, BD2056AFJ  
I/O circuit  
Symbol  
Pin No  
3, 4  
Equivalent circuit  
/EN1(EN1)  
/EN2(EN2)  
EN1(/EN1)  
EN2(/EN2)  
/OC1  
/OC2  
/OC1  
/OC2  
5, 8  
OUT1  
OUT2  
OUT1  
OUT2  
6, 7  
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2009.05 - Rev.A  
8/13  
© 2009 ROHM Co., Ltd. All rights reserved.  
Technical Note  
BD2046AFJ, BD2056AFJ  
Functional description  
1. Switch operation  
IN terminal and OUT terminal are connected to the drain and the source of switch MOSFET respectively. And the IN  
terminal is used also as power source input to internal control circuit.  
When the switch is turned on from EN/EN control input, IN terminal and OUT terminal are connected by a 100mswitch.  
In on status, the switch is bidirectional. Therefore, when the potential of OUT terminal is higher than that of IN terminal,  
current flows from OUT terminal to IN terminal.  
Since a parasitic diode between the drain and the source of switch MOSFET is canceled, in the off status, it is possible to  
prevent current from flowing reversely from OUT to IN.  
2. Thermal shutdown circuit (TSD)  
Thermal shut down circuit have dual thermal shutdown threshold. Since thermal shutdown works at a lower junction  
temperature when an overcurrent occurs, only the switch of an overcurrent state become off and error flag is output.  
Thermal shut down action has hysteresis. Therefore, when the junction temperature goes down, switch on and error flag  
output automatically recover. However, until cause of junction temperature increase such as output shortcircuit is removed  
or the switch is turned off, thermal shut down detection and recovery are repeated. The thermal shut down circuit works  
when the switch of either OUT1 or OUT2 is on (EN,/EN signal is active).  
3. Over current detection (OCD)  
The over current detection circuit limits current (ISC) and outputs error flag (/OC) when current flowing in each switch  
MOSFET exceeds a specified value. There are three types of response against over current. The over current detection  
circuit works when the switch is on (EN,/EN signal is active).  
3-1. When the switch is turned on while the output is in shortcircuit status  
When the switch is turned on while the output is in shortcircuit status or so, the switch gets in current limit status soon.  
3-2. When the output shortcircuits while the switch is on  
When the output shortcircuits or large capacity is connected while the switch is on, very large current flows until the  
over current limit circuit reacts. When the current detection, limit circuit works, current limitation is carried out.  
3-3. When the output current increases gradually  
When the output current increases gradually, current limitation does not work until the output current exceeds the over  
current detection value. When it exceeds the detection value, current limitation is carried out.  
4. Under voltage lockout (UVLO)  
UVLO circuit prevents the switch from turning on until the VIN exceeds 2.3V(Typ.). If the VIN drops below 2.2V(Typ.) while  
the switch turns on, then UVLO shuts off the switch. UVLO has hysteresis of a 100mV(Typ).  
Under voltage lockout circuit works when the switch of either OUT1 or OUT2 is on (EN,/EN signal is active).  
5. Error flag (/OC) output  
Error flag output is N-MOS open drain output. At detection of over current, thermal shutdown, low level is output.  
Over current detection has delay filter. This delay filter prevents instantaneous current detection such as inrush current at  
switch on, hot plug from being informed to outside.  
www.rohm.com  
© 2009 ROHM Co., Ltd. All rights reserved.  
2009.05 - Rev.A  
9/13  
Technical Note  
BD2046AFJ, BD2056AFJ  
/EN  
V
Output shortcircuit  
Thermal shut down  
OUT  
V
OUT  
I
/OC  
V
delay  
Fig.38 Over current detection, thermal shutdown timing  
(BD2046AFJ)  
EN  
V
Output shortcircuit  
Thermal shut down  
OUT  
V
OUT  
I
/OC  
V
delay  
Fig.39 Over current detection, thermal shutdown timing  
(BD2056AFJ)  
Typical application circuit  
5V(Typ)  
10k~100k  
10k~100k  
Ferrite  
Beads  
VBUS  
IN  
OUT  
ON/OFF  
OC  
GND  
IN  
/OC1  
OUT1  
OUT2  
/OC2  
L
L
D+  
D-  
C
IN  
C
/EN1  
(EN1)  
/EN2  
(EN2)  
OC  
Regulator  
GND  
Data  
Data  
ON/OFF  
C
Data  
BD2046AFJ/56AFJ  
USB Controller  
Fig.40 Typical application circuit  
www.rohm.com  
2009.05 - Rev.A  
10/13  
© 2009 ROHM Co., Ltd. All rights reserved.  
Technical Note  
BD2046AFJ, BD2056AFJ  
Application information  
When excessive current flows owing to output shortcircuit or so, ringing occurs by inductance of power source line to IC, and  
may cause bad influences upon IC actions. In order to avoid this case, connect a bypath capacitor by IN terminal and GND  
terminal of IC. 1uF or higher is recommended.  
Pull up /OC output by resistance 10k~ 100k.  
Set up value which satisfies the application as CL and Ferrite Beads.  
This system connection diagram doesn’t guarantee operating as the application.  
The external circuit constant and so on is changed and it uses, in which there are adequate margins by taking into account  
external parts or dispersion of IC including not only static characteristics but also transient characteristics.  
This system connection diagram doesn’t guarantee operating as the application.  
The external circuit constant and so on is changed and it uses, in which there are adequate margins by taking into account  
external parts or dispersion of IC including not only static characteristics but also transient characteristics.  
Power dissipation character  
(SOP-J8)  
600  
500  
400  
300  
200  
100  
0
0
25  
50  
75  
100  
125  
150  
AMBIENT TEMPERATURE: Ta [  
]
Fig.41 Power dissipation curve (Pd-Ta Curve)  
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© 2009 ROHM Co., Ltd. All rights reserved.  
2009.05 - Rev.A  
11/13  
Technical Note  
BD2046AFJ, BD2056AFJ  
Notes for use  
(1) Absolute Maximum Ratings  
An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can  
break down devices, thus making impossible to identify breaking mode such as a short circuit or an open circuit. If any  
special mode exceeding the absolute maximum ratings is assumed, consideration should be given to take physical safety  
measures including the use of fuses, etc.  
(2) Operating conditions  
These conditions represent a range within which characteristics can be provided approximately as expected. The  
electrical characteristics are guaranteed under the conditions of each parameter.  
(3) Reverse connection of power supply connector  
The reverse connection of power supply connector can break down ICs. Take protective measures against the breakdown due  
to the reverse connection, such as mounting an external diode between the power supply and the IC’s power supply terminal.  
(4) Power supply line  
Design PCB pattern to provide low impedance for the wiring between the power supply and the GND lines. In this regard,  
for the digital block power supply and the analog block power supply, even though these power supplies has the same  
level of potential, separate the power supply pattern for the digital block from that for the analog block, thus suppressing  
the diffraction of digital noises to the analog block power supply resulting from impedance common to the wiring patterns.  
For the GND line, give consideration to design the patterns in a similar manner.  
Furthermore, for all power supply terminals to ICs, mount a capacitor between the power supply and the GND terminal. At the  
same time, in order to use an electrolytic capacitor, thoroughly check to be sure the characteristics of the capacitor to be used  
present no problem including the occurrence of capacity dropout at a low temperature, thus determining the constant.  
(5) GND voltage  
Make setting of the potential of the GND terminal so that it will be maintained at the minimum in any operating state.  
Furthermore, check to be sure no terminals are at a potential lower than the GND voltage including an actual electric transient.  
(6) Short circuit between terminals and erroneous mounting  
In order to mount ICs on a set PCB, pay thorough attention to the direction and offset of the ICs. Erroneous mounting can  
break down the ICs. Furthermore, if a short circuit occurs due to foreign matters entering between terminals or between  
the terminal and the power supply or the GND terminal, the ICs can break down.  
(7) Operation in strong electromagnetic field  
Be noted that using ICs in the strong electromagnetic field can malfunction them.  
(8) Inspection with set PCB  
On the inspection with the set PCB, if a capacitor is connected to a low-impedance IC terminal, the IC can suffer stress.  
Therefore, be sure to discharge from the set PCB by each process. Furthermore, in order to mount or dismount the set  
PCB to/from the jig for the inspection process, be sure to turn OFF the power supply and then mount the set PCB to the jig.  
After the completion of the inspection, be sure to turn OFF the power supply and then dismount it from the jig. In addition,  
for protection against static electricity, establish a ground for the assembly process and pay thorough attention to the  
transportation and the storage of the set PCB.  
(9) Input terminals  
In terms of the construction of IC, parasitic elements are inevitably formed in relation to potential. The operation of the  
parasitic element can cause interference with circuit operation, thus resulting in a malfunction and then breakdown of the  
input terminal. Therefore, pay thorough attention not to handle the input terminals, such as to apply to the input terminals a  
voltage lower than the GND respectively, so that any parasitic element will operate. Furthermore, do not apply a voltage to  
the input terminals when no power supply voltage is applied to the IC. In addition, even if the power supply voltage is  
applied, apply to the input terminals a voltage lower than the power supply voltage or within the guaranteed value of  
electrical characteristics.  
(10) Ground wiring pattern  
If small-signal GND and large-current GND are provided, It will be recommended to separate the large-current GND  
pattern from the small-signal GND pattern and establish a single ground at the reference point of the set PCB so that  
resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of the  
small-signal GND. Pay attention not to cause fluctuations in the GND wiring pattern of external parts as well.  
(11) External capacitor  
In order to use a ceramic capacitor as the external capacitor, determine the constant with consideration given to a  
degradation in the nominal capacitance due to DC bias and changes in the capacitance due to temperature, etc.  
(12) Thermal shutdown circuit (TSD)  
When junction temperatures become detected temperatures or higher, the thermal shutdown circuit operates and turns a  
switch OFF. The thermal shutdown circuit, which is aimed at isolating the LSI from thermal runaway as much as possible,  
is not aimed at the protection or guarantee of the LSI. Therefore, do not continuously use the LSI with this circuit  
operating or use the LSI assuming its operation.  
(13) Thermal design  
Perform thermal design in which there are adequate margins by taking into account the power dissipation (Pd) in actual states of use.  
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2009.05 - Rev.A  
12/13  
© 2009 ROHM Co., Ltd. All rights reserved.  
Technical Note  
BD2046AFJ, BD2056AFJ  
Ordering part number  
B D  
2
0
4
6
A
F
J
-
E
2
Part No.  
Part No.  
2046A  
2056A  
Package  
FJ: SOP-J8  
Packaging and forming specification  
E2: Embossed tape and reel  
(SOP-J8)  
SOP-J8  
<Tape and Reel information>  
4.9 0.2  
(MAX 5.25 include BURR)  
Tape  
Embossed carrier tape  
2500pcs  
+
6°  
4°  
4°  
Quantity  
8
7
6
5
E2  
Direction  
of feed  
The direction is the 1pin of product is at the upper left when you hold  
reel on the left hand and you pull out the tape on the right hand  
(
)
1
2
3
4
0.545  
0.2 0.1  
S
1.27  
0.42 0.1  
Direction of feed  
1pin  
0.1  
S
Reel  
(Unit : mm)  
Order quantity needs to be multiple of the minimum quantity.  
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© 2009 ROHM Co., Ltd. All rights reserved.  
2009.05 - Rev.A  
13/13  
Notice  
N o t e s  
No copying or reproduction of this document, in part or in whole, is permitted without the  
consent of ROHM Co.,Ltd.  
The content specified herein is subject to change for improvement without notice.  
The content specified herein is for the purpose of introducing ROHM's products (hereinafter  
"Products"). If you wish to use any such Product, please be sure to refer to the specifications,  
which can be obtained from ROHM upon request.  
Examples of application circuits, circuit constants and any other information contained herein  
illustrate the standard usage and operations of the Products. The peripheral conditions must  
be taken into account when designing circuits for mass production.  
Great care was taken in ensuring the accuracy of the information specified in this document.  
However, should you incur any damage arising from any inaccuracy or misprint of such  
information, ROHM shall bear no responsibility for such damage.  
The technical information specified herein is intended only to show the typical functions of and  
examples of application circuits for the Products. ROHM does not grant you, explicitly or  
implicitly, any license to use or exercise intellectual property or other rights held by ROHM and  
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the  
use of such technical information.  
The Products specified in this document are intended to be used with general-use electronic  
equipment or devices (such as audio visual equipment, office-automation equipment, commu-  
nication devices, electronic appliances and amusement devices).  
The Products specified in this document are not designed to be radiation tolerant.  
While ROHM always makes efforts to enhance the quality and reliability of its Products, a  
Product may fail or malfunction for a variety of reasons.  
Please be sure to implement in your equipment using the Products safety measures to guard  
against the possibility of physical injury, fire or any other damage caused in the event of the  
failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM  
shall bear no responsibility whatsoever for your use of any Product outside of the prescribed  
scope or not in accordance with the instruction manual.  
The Products are not designed or manufactured to be used with any equipment, device or  
system which requires an extremely high level of reliability the failure or malfunction of which  
may result in a direct threat to human life or create a risk of human injury (such as a medical  
instrument, transportation equipment, aerospace machinery, nuclear-reactor controller,  
fuel-controller or other safety device). ROHM shall bear no responsibility in any way for use of  
any of the Products for the above special purposes. If a Product is intended to be used for any  
such special purpose, please contact a ROHM sales representative before purchasing.  
If you intend to export or ship overseas any Product or technology specified herein that may  
be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to  
obtain a license or permit under the Law.  
Thank you for your accessing to ROHM product informations.  
More detail product informations and catalogs are available, please contact us.  
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© 2009 ROHM Co., Ltd. All rights reserved.  
R0039  
A

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