Datasheet
1ch High Side Switch ICs
1.0A Current Limit High Side Switch ICs
BD2041AFJ
BD2051AFJ
Key Specifications
Input Voltage Range:
2.7V to 5.5V
ON-Resistance:
80mΩ(Typ)
Continuous Current Load:
0.5A
Over-Current Threshold:
0.7A (Min), 1.6A (Max)
Standby Current:
0.01μA (Typ)
Output Rise Time:
1.2ms(Typ)
Operating Temperature Range:
-40°C to +85°C
W(Typ)
D(Typ)
H (Max)
General Description
BD2041AFJ and BD2051AFJ are single channel high
side switch ICs with over-current protection for
Universal Serial Bus (USB) power supply line. These
ICs have low ON-Resistance N-Channel power
MOSFETs with low supply current, built-in over-current
protection circuit, thermal shutdown circuit, under
voltage lockout and soft-start circuit.
Built-In Low ON-Resistance Nch MOSFET
( Typ=80mΩ )
Control Input Logic
Active-Low:
BD2041AFJ
Active-High:
BD2051AFJ
Soft-Start Circuit
Over-Current Protection
Thermal Shutdown
Under Voltage Lockout Function
Open Drain Error Flag Output
Reverse-Current Protection when Switch Off
Flag Output Delay
Features
Package
SOP-J8
4.90mm x 6.00mm x 1.65mm
Applications
USB Hub in Consumer Appliances, PC, PC Peripheral
Equipment, and so forth
Typical Application Circuit
5V(Typ)
GND
IN
IN
OUT
OUT
OUT
+
C
L
-
VBUS
D+
D-
GND
C
IN
EN( /EN ) /OC
Lineup
Over-Current Threshold
Min
Typ
Max
0.7A
1.0A
1.6A
0.7A
1.0A
1.6A
Control Input
Logic
Low
High
Package
SOP-J8
SOP-J8
Reel of 2500
Reel of 2500
Orderable Part Number
BD2041AFJ-E2
BD2051AFJ-E2
○Product
structure：Silicon monolithic integrated circuit
○This
product has not designed protection against radioactive rays
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BD2041AFJ
Block Diagram
BD2051AFJ
GND
OUT
IN
UVLO
Charge
pump
OCD
OUT
IN
Gate logic
OUT
EN(/EN)
TSD
/OC
Pin Configurations
BD2041AFJ
TOP VIEW
1
2
3
4
GND
IN
IN
/EN
OUT
OUT
OUT
8
7
6
5
1
2
3
4
BD2051AFJ
TOP VIEW
GND
IN
IN
EN
OUT
OUT
OUT
8
7
6
5
/OC
/OC
Pin Description
Pin No.
1
2, 3
Symbol
GND
IN
I/O
I
I
Ground.
Power supply input.
Input terminal to the power switch and power supply input terminal of the internal circuit.
When used, connect each pin outside.
Enable input.
/EN: Power switch on at low level. (BD2041AFJ)
EN: Power switch on at high level. (BD2051AFJ)
High level input > 2.0V, low level input < 0.8V.
Error flag output.
Low at over current, thermal shutdown.
Open drain output.
Power switch output.
When used, connect each pin outside.
Pin Function
4
EN, /EN
I
5
6, 7, 8
/OC
OUT
O
O
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BD2041AFJ
BD2051AFJ
Absolute Maximum Ratings
Parameter
Supply Voltage
Enable Voltage
/OC Voltage
/OC Current
OUT Voltage
Storage Temperature
Power Dissipation
Symbol
V
IN
V
EN
, V
/EN
V
/OC
I
/OC
V
OUT
Tstg
Pd
Rating
-0.3 to +6.0
-0.3 to +6.0
-0.3 to +6.0
10
-0.3 to +6.0
-55 to +150
0.67
(Note 1)
Unit
V
V
V
mA
V
°C
W
(Note 1) Derating in done 5.4 mW/°C for operating above Ta≧25°C (Mount on 1-layer 70.0mm x 70.0mm x 1.6mm board)
Caution:
Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated
over the absolute maximum ratings.
Recommended Operating Conditions
Parameter
Operating Voltage
Operating Temperature
Continuous Output Current
Symbol
V
IN
Topr
I
LO
Rating
Min
2.7
-40
0
Typ
-
-
-
Max
5.5
+85
500
Unit
V
°C
mA
Electrical Characteristics
BD2041AFJ
(Unless otherwise specified, V
IN
= 5.0V, Ta = 25°C)
Limit
Parameter
Symbol
Min
Typ
I
DD
I
STB
V
/ENH
/EN Input Voltage
/EN Input Current
/OC Output Low Voltage
/OC Output Leak Current
/OC Delay Time
ON-Resistance
Over-Current Threshold
Output Current at Short
Output Rise Time
Output Turn ON Time
Output Fall Time
Output Turn OFF Time
UVLO Threshold
V
/ENL
I
/EN
V
/OC
I
L/OC
t
/OC
R
ON
I
TH
I
SC
t
ON1
t
ON2
t
OFF1
t
OFF2
V
TUVH
V
TUVL
-
-
2.0
-
-
-1.0
-
-
-
-
0.7
0.7
-
-
-
-
2.1
2.0
90
0.01
-
-
-
+0.01
-
0.01
2.5
80
1.0
1.0
1.2
1.5
1
3
2.3
2.2
Unit
μA
μA
V
V
V
μA
V
μA
ms
mΩ
A
A
ms
ms
μs
μs
V
V
Increasing V
IN
Decreasing V
IN
R
L
= 10Ω, C
L
= OPEN
V
IN
= 5V, V
OUT
= 0V,
C
L
= 100μF (RMS)
I
OUT
= 500mA
Conditions
V
/EN
= 0V, OUT = OPEN
V
/EN
= 5V, OUT = OPEN
High Input
Low Input
Low Input 2.7V≤ V
IN
≤4.5V
V
/EN
= 0V or V
/EN
= 5V
I
/OC
= 5mA
V
/OC
= 5V
Max
120
1
-
0.8
0.4
+1.0
0.5
1
8
100
1.6
1.3
10
20
20
40
2.5
2.4
Operating Current
Standby Current
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BD2041AFJ
BD2051AFJ
BD2051AFJ
Electrical Characteristics - continued
(Unless otherwise specified, V
IN
= 5.0V, Ta = 25°C)
Limit
Parameter
Symbol
Min
Typ
I
DD
I
STB
V
ENH
-
-
2.0
-
-
-1.0
-
-
-
-
0.7
0.7
-
-
-
-
2.1
2.0
90
0.01
-
-
-
+0.01
-
0.01
2.5
80
1.0
1.0
1.2
1.5
1
3
2.3
2.2
Max
120
1
-
0.8
0.4
+1.0
0.5
1
8
100
1.6
1.3
10
20
20
40
2.5
2.4
Unit
μA
μA
V
V
V
μA
V
μA
ms
mΩ
A
A
ms
ms
μs
μs
V
V
Conditions
V
EN
= 5V, OUT = OPEN
V
EN
= 0V, OUT = OPEN
High Input
Low Input
Low Input 2.7V≤ V
IN
≤4.5V
V
EN
= 0V or V
EN
= 5V
I
/OC
= 5mA
V
/OC
= 5V
I
OUT
= 500mA
V
IN
= 5V, V
OUT
= 0V,
C
L
= 100μF (RMS)
R
L
= 10Ω, C
L
= OPEN
Operating Current
Standby Current
EN Input Voltage
EN Input Current
/OC Output Low Voltage
/OC Output Leak Current
/OC Delay Time
ON-Resistance
Over-Current Threshold
Output Current at Short
Output Rise Time
Output Turn ON Time
Output Fall Time
Output Turn OFF Time
UVLO Threshold
V
ENL
I
EN
V
/OC
I
L/OC
t
/OC
R
ON
I
TH
I
SC
t
ON1
t
ON2
t
OFF1
t
OFF2
V
TUVH
V
TUVL
Increasing V
IN
Decreasing V
IN
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BD2041AFJ
BD2051AFJ
Measurement Circuit
V
IN
A
1uF
GND
IN
IN
EN(/EN)
V
EN
(V
/EN
)
OUT
OUT
OUT
/OC
V
EN
(V
/EN
)
1uF
GND
IN
IN
EN(/EN)
OUT
OUT
OUT
/OC
R
L
C
L
V
IN
A.
Operating Current
B. EN, /EN Input Voltage, Output Rise / Fall Time
V
IN
1uF
GND
IN
IN
EN(/EN)
V
EN
(V
/EN
)
OUT
OUT
OUT
/OC
V
IN
10k
V
IN
1uF
GND
IN
IN
I
OUT
C
L
V
IN
I
/OC
OUT
OUT
OUT
/OC
EN(/EN)
V
EN
(V
/EN
)
C. ON-Resistance, Over Current Detection
Figure 1. Measurement Circuit
D. /OC Output Low Voltage
Timing Diagram
t
OFF1
t
ON1
90%
V
OUT
10%
t
OFF2
t
ON2
V
/EN
V
/ENL
V
/ENH
V
EN
V
ENH
V
ENL
t
ON2
10%
90%
V
OUT
10%
t
OFF2
10%
t
ON1
90%
90%
t
OFF1
Figure 2. Timing Diagram(BD2041AFJ)
Figure 3. Timing Diagram (BD2051AFJ)
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