BL2553
DESCRIPTION
BL2553
Precision Load Switch
with Adjustable Current Limit
APPLICATION
USB ports/Hubs
Hot Swaps
Cellphones
Tablet PC
Set Top Box
PC motherboard
Handheld Devices
The BL2553 is a load switch which provides full
protection to systems and loads which may
encounter large current conditions. BL2553 offers a
95mΩ current-limited switch which can operate over
an input voltage range of 2.5-5.5V. The current limit
can be externally programmed by a precision resistor,
ranges from 75mA to 1.7A. Switch control is by a logic
input (EN) capable of interfacing directly with low
voltage control signals. Current is prevented from
flowing when the switch is off and the output voltage
is higher than the input voltage. BL2553 also features
thermal shutdown protection which shuts off the
switch to prevent damage to the part when a
continuous over-current condition causes excessive
heating. When the switch current reaches the current
limit, the parts operate in a constant-current mode to
prohibit excessive currents from causing damage. The
BL2553 will not turn off after a current limit fault, but
will rather remain in the constant current mode
indefinitely. The nFAULT output asserts low during
over-current and reverse-voltage conditions.
BL2553 is housed in a tiny DFN2x2-6L package。
FEATURES
Up to 1.5A Max Load current
Accurate Current-limit threshold: +/-5%
Programmable Current-limit : 75mA to 1.7A
Fast Over-Current Response
Fault Flag Output: nFAULT Pin
Reversed Current blocking
Thermal Shutdown, UVLO protection
Tiny DFN2x2-6L Package
TYPICAL APPLICATION
1
BELLING [ SHANGHAI BELLING CO., LTD. ]
