BELLING BL2554CB5TR Adjustable usb load current switch Datasheet

BL2554
Adjustable USB Load Current Switch
DESCRIPTION
FEATURES
The BL2554 is Adjustable USB Load Current
Switch Current Limited designed for high-side
load switching applications. The internal currentlimiting circuit protects the input supply against
large output short circuit current which may
cause the supply to fall out of regulation.
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The current limit threshold is programmed with
an external resistor from ISET Pin to ground. The
quiescent supply current is typically 150μA,
making the device ideal for portable batteryoperated equipment. In shutdown mode, the
supply current decreases to less than 0.1μA.
Additional features include thermal shutdown
and constant current output characteristics if
current exceed its current limit.
The BL2554 is available in SOT23-5 and SOT23-6
packages.
TYPICAL APPLICATION
2.5 to 5.5V input voltage range
Controlled turn-on
0.15-1.3A adjustable current limit
+/-6% current limit accuracy
0.25ohm on resistance
Fast current limit response time
Logic Control Shutdown (IQ<1uA)
Thermal shutdown and UVLO
Reverse current blocking
SOT23-5 and SOT23-6 packages
APPLICATIONS
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Portable Devices
MID, MP4…
Set top boxes
Notebook and PC mother board
USB supplied Devices
PIN OUT & MARKING
BL2554
ORDERING INFORMATION
Part No.
Package
Tape&Reel
BL2554CB5TR
SOT23-5
3000/Reel
BL2554CB6TR
SOT23-6
3000/Reel
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SOT23-5
SOT23-6
Note: YW means the year and week parts being
manufactured, subjected to change. CM is the code of
the product, it will not be changed on any part.
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V1.6
BL2554
ABSOLUTE MAXIMUM RATING
Parameter
Value
Max Input Voltage
Max Operating Junction Temperature(Tj)
Ambient Temperature(Ta)
Maximum Power Dissipation
SOT23-5
Storage Temperature(Ts)
Lead Temperature & Time
ESD (HBM)
6V
125C
-40C – 85C
250mW
-40C - 150C
260C, 10S
>4000V
Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect device
reliability.
RECOMMENDED WORK CONDITIONS
Parameter
Value
Input Voltage Range
Operating Junction Temperature(Tj)
Max. 5.5V
-20C –125C
ELECTRICAL CHARACTERISTICS
(Vin=5V, TA=25C)
Symbol
Parameter
Vin
Input Voltage Range
Iq
Quiescent Current
Conditions
Min
Typ
2.6
Active, Vfb=0.65, No Switching
150
Shutdown
Switch Rdson
Iout=500mA
Ilimit
Adjustable current limit
R_Iset=53K ohm
R_Iset=25K ohm
R_Iset=20K ohm
250
0.5
1.0
1.3
Vout=5V, Vin=0V
0.1
Vh_on
Reverse Voltage Leakage
Current
ON Input High Voltage
Vl_on
ON Input Low Voltage
Tsd
Unit
V
300
uA
1
Rdson
Irevlk
Max
5.5
A
5
1.5
uA
V
0.4
Thermal shutdown Temp.
uA
mohm
155
V
o
C
SETTING THE CURRENT LIMIT THRESHOLD
RILIM ( KΩ)
Typical Current Limit (mA)
RILIM ( KΩ)
Typical Current Limit (mA)
200
180
151
100
82
68
138
152
179
266
324
389
51
43
30
20
520
612
873
1295
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V1.6
BL2554
PIN DESCRIPTION
NAME
PIN #
SOT23-6
6
2
Vout
GND
PIN #
SOT23-5
1
2
Iset
3
5
On
Vin
nFAULT
4
5
-
3
1
4
DESCRIPTION
Switch Output, the output of power switch
Ground
Current limit setting pin. Connecting a resistor (R_Iset) from this pin
to ground will adjust the current limit
Control input, enable pin, active high
Supply input voltage
Fault flagging pin. Connect a pull up resistor to IN, when in fault
conditions, this pin is asserted low
ELECTRICAL PERFORMANCE
Tested under TA=25C, unless otherwise specified
Turn on delay and rise time
Turn off delay and fall time
Device enabled into short circuit
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Full load to short circuit transient response
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V1.6
BL2554
Short circuit to full load recovery response
No load to short circuit transient response
Short circuit to no load recovery response
No load to 1transient response
1to no load transient response
Switch current Vs. dropout voltage
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V1.6
BL2554
BLOCK DIAGRAM
DETAILED DESCRIPTION
Operation
The BL2554 is a current limited switch that protects
systems and loads which can be damaged or disrupted
by the application of high currents. The core of each
device is a 0.10Ω P-channel MOSFET and a controller
capable of functioning over a wide input operating
range of 2.6-5.5V. The controller protects against
system malfunctions through current limiting,
undervoltage lockout and thermal shutdown. The
current limit is adjustable from 0.15A to 1.3A through
the selection of an external resistor.
On/Off control
The ON pin controls the state of the switch. When ON
is high, the switch is in the on state. Activating ON
continuously holds the switch in the on state so long as
there is no fault. An undervoltage on VIN or a junction
temperature in excess of 155°C overrides the ON
control to turn off the switch. The BL2554 does not
turn off in response to an over current condition but
instead remains operating in a constant current mode
so long as ON is active and the thermal shutdown or
undervoltage lockout have not activated. The ON pin
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5
control voltage and VIN pin have independent and
recommended operating ranges. The ON pin voltage
can be driven by a voltage level higher than the input
voltage.
Current limiting
The current limit ensures that the current through the
switch doesn't exceed a maximum value while not
limiting at less than a minimum value. The current at
which the parts will limit is adjustable through the
selection of an external resistor connected to ISET.
Information for selecting the resistor is found in the
Application Info section. The BL2554 has no current
limit blanking period so it will remain in a constant
current state until the ON pin is deactivated or the
thermal shutdown turns-off the switch.
Thermal Shutdown
The thermal shutdown protects the die from internally
or externally generated excessive temperatures.
During an over-temperature condition the switch is
turned-off. The switch automatically turns-on again if
temperature of the die drops below the threshold
temperature.
V1.6
BL2554
PACKAGE OUTLINE
Package
SOT23-5
Devices per reel
3000
Unit
mm
Devices per reel
3000
Unit
mm
Package specification:
Package
SOT23-6
Package specification:
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V1.6
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