ROHM BD2045AFJ Technical data
Power Management Switch ICs for PCs and Digital Consumer Products
1ch High Side Switch ICs
for USB Devices and Memory Cards
BD2045AFJ, BD2055AFJ
●Description
Single channel high side switch IC for USB port is a high side switch having over current protection used in power supply line
of universal serial bus (USB).
N-channel power MOSFET of low on resistance and low supply current are realized in this IC.
And, over current detection circuit, thermal shutdown circuit, under voltage lockout and soft start circuit are built in.
●Features
1) Low on resistance 80mΩ Nch MOSFET Switch.
2) Continuous current load 0.25A
3) Control input logic
Active-Low : BD2045AFJ
Active-High : BD2055AFJ
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 power switch off
10) Power supply voltage range 2.7V to 5.5V
11) TTL Enable input
12) 1.2ms typical rise time
13) 10μA max standby current
14) Operating temperature range -40°C to 85°C
●Applications
USB hub in consumer appliances, Car accessory, PC, PC peripheral equipment, and so forth
●Lineup
No.11029ECT04
Parameter BD2045AFJ BD2055AFJ
Continuous current load (A) 0.25 0.25
Output current at short (A) 0.5 0.5
Control input logic Low High
●Absolute Maximum Ratings
Parameter Symbol Ratings Unit
Supply voltage VIN -0.3 to 6.0 V
Enable voltage VEN, V/EN -0.3 to 6.0 V
/OC voltage V/OC -0.3 to 6.0 V
/OC current IS/OC 10 mA
OUT voltage VOUT -0.3 to 6.0 V
Storage temperature TSTG -55 to 150 °C
Power dissipation PD 560*1 mW
*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.
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1/12
2011.06 - Rev.C
BD2045AFJ, BD2055AFJ
●Operating conditions
Parameter Symbol Ratings Unit
Operating voltage VIN 2.7 to 5.5 V
Operating temperature TOPR -40 to 85 °C
Continuous output current ILO 0 to 250 mA
●Electrical characteristics
◎BD2045AFJ (Unless otherwise specified, V
Parameter Symbol
IN = 5.0V, Ta = 25°C)
Limits
Min. Typ. Max.
Unit Condition
Operating Current IDD - 90 120 μA V/EN = 0V, OUT = OPEN
Standby Current ISTB - 0.01 1 μA V/EN = 5V, OUT = OPEN
V/EN 2.0 - - V High input
/EN input voltage
V/EN
- - 0.8 V Low input
- - 0.4 V Low input 2.7V≤ VIN ≤4.5V
/EN input current I/EN -1.0 0.01 1.0 μA V/EN = 0V or V/EN = 5V
/OC output LOW voltage V/OC - - 0.5 V I/OC = 5mA
/OC output leak current IL/OC - 0.01 1 μA V/OC = 5V
Technical Note
ON resistance RON - 80 100 mΩ IOUT = 250mA
V
Output current at short ISC 0.3 0.5 0.7 A
IN = 5V, VOUT = 0V,
CL = 100μF (RMS)
Output rise time TON1 - 1.2 10 ms
Output turn on time TON2 - 1.5 20 ms
R
L = 20Ω , CL = OPEN
Output fall time TOFF1 - 1 20 μs
Output turn off time TOFF2 - 3 40 μs
UVLO threshold
VTUVH 2.1 2.3 2.5 V Increasing VIN
VTUVL 2.0 2.2 2.4 V Decreasing VIN
◎BD2055AFJ (Unless otherwise specified, VIN = 5.0V, Ta = 25°C)
Parameter Symbol
Min. Typ. Max.
Limits
Unit Condition
Operating Current IDD - 90 120 μA VEN = 5V, OUT = OPEN
Standby Current I
- 0.01 1 μA VEN = 0V, OUT = OPEN
STB
VEN 2.0 - - V High input
EN input voltage
VEN
- - 0.8 V Low input
- - 0.4 V Low input 2.7V≤ VIN ≤4.5V
EN input current IEN -1.0 0.01 1.0 μA VEN = 0V or VEN = 5V
/OC output LOW voltage V
/OC output leak current IL
- - 0.5 V I/OC = 5mA
/OC
- 0.01 1 μA V/OC = 5V
/OC
ON resistance RON - 80 100 mΩ IOUT = 250mA
IN = 5V, VOUT = 0V,
Output current at short ISC 0.3 0.5 0.7 A
Output rise time T
Output turn on time T
Output fall time T
Output turn off time T
UVLO Threshold
- 1.2 10 ms
ON1
- 1.5 20 ms
ON2
- 1 20 μs
OFF1
- 3 40 μs
OFF2
2.1 2.3 2.5 V Increasing VIN
V
TUVH
V
2.0 2.2 2.4 V Decreasing VIN
TUVL
V
L = 100μF (RMS)
C
L = 20Ω , CL = OPEN
R
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2/12
2011.06 - Rev.C
BD2045AFJ, BD2055AFJ
A
/
●Measurement circuit
V
IN
Technical Note
V
IN
1uF
VEN(V
)
/EN
GND
IN
IN
EN( /EN)
OUT
OUT
OUT
/OC
1uF
VEN(V
GND
IN
IN
EN( /EN)
)
/EN
OUT
OUT
OUT
OC
R
L
Operating current EN, /EN input voltage, Output rise, fall time
V
IN
1uF
VEN(V
GND
IN
IN
EN( /EN)
)
/EN
OUT
OUT
OUT
/OC
10k
V
IN
1uF
C
I
OUT
L
VEN(V
V
IN
GND
IN
IN
EN( /EN)
)
/EN
OUT
OUT
OUT
/OC
V
IN
I
/OC
ON resistance, Over current detection /OC output LOW voltage
Fig.1 Measurement circuit
●Timing diagram
○BD2045AFJ ○BD2055AFJ
C
L
T
OFF1
V
V
OUT
/EN
T
ON1
90%
10%
T
ON2
50% 50%
90%
10%
T
OFF2
V
OUT
V
10%
EN
T
ON1
90%
T
ON2
50% 50%
Fig.2 Timing diagram Fig.3 Timing diagram
90%
10%
T
T
OFF1
OFF2
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3/12
2011.06 - Rev.C
BD2045AFJ, BD2055AFJ
w
●Reference data
120
Ta= 2 5° C
100
80
[μA]
60
DD
I
40
OPERATING CURRENT :
20
0
23456
SUPPLY VOLTAGE : V
Fig.4 Operating current
EN,/EN Enable
1.0
VIN=5.0V
0.8
[V]
IN
0.6
[μA]
STB
I
0.4
0.2
OPERATING CURRENT :
0.0
-50 0 50 100
AMBIENT TEM PERATU RE : Ta[
Fig.7 Operating current
EN,/EN Disable
0.5
Ta= 2 5° C
0.4
℃
0.3
[V]
/OC
V
0.2
0.1
/OC OUTPUT LOW VOLTAGE :
0.0
23456
SUPPLY VOLT AGE : V
[V]
IN
Fig.10 /OC output LOW voltage
200
VIN=5.0V
150
[mΩ]
100
ON
R
ON RESISTANCE :
50
0
-50 0 50 100
AMBIENT TEM PERATU RE : Ta[℃]
Fig.13 ON resistance
Technical Note
120
VIN=5.0V
100
80
[μA]
60
DD
I
40
OPERATING CURRENT :
20
0
-50 0 50 100
AMBIEN T TEMPER ATU RE : T a[℃]
Fig.5 Operating current
EN,/EN Enable
2.0
Ta= 2 5° C
1.5
[V] 0
/EN
V
EN,
V
ENABLE INPUT VOLTAGE :
]
Low to High
1.0
0.5
0.0
23 456
SUPPLY VOLTAGE : V
High to Low
IN
[V]
Fig.8 EN,/EN input voltage
0.5
VIN=5.0V
0.4
0.3
[V]
/OC
V
0.2
0.1
/OC OUTPUT LOW VOLTAGE :
0.0
-50 0 50 100
AMBIENT TEMPER ATURE : Ta[℃]
Fig.11 /OC output LOW voltage Fig.12 ON resistance
1.00
Ta= 2 5° C
0.75
[A]
0.50
SC
I
0.25
SHORT CIRCUIT CURRENT :
0.00
23 456
SUPPLY VOLTAGE : V
[V]
IN
Fig.14 Output current at shortcircuit
1.0
Ta= 2 5° C
0.8
0.6
[μA]
STB
I
0.4
0.2
OPERATING CURRENT :
0.0
23456
SUPPLY VOLTAGE : V
[V]
IN
Fig.6 Operating current
EN,/EN Disable
2.0
VIN=5.0V
1.5
[V]
/EN
1.0
, V
EN
V
0.5
ENABLE INPUT VOLTAGE :
0.0
-50 0 50 100
AMBIENT TEM PERATU RE : T a[℃]
Low to High
High to Lo
Fig.9 EN,/EN input voltage
200
Ta= 2 5° C
150
mΩ]
100
ON[
R
ON RESISTANCE :
50
0
23 456
SUPPLY VOLTAGE : V
1.00
VIN=5.0V
0.75
[A]
0.50
SC
I
0.25
SHORT CIRCUIT CURRENT :
0.00
-50 0 50 100
AMBIENT TEM PERATU RE : Ta[℃]
[V]
IN
Fig.15 Output current at shortcircuit
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4/12
2011.06 - Rev.C
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