LND3526 查看數據表（PDF） - Linear Dimensions Semiconductor
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LND3526 Datasheet PDF : 7 Pages
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LND 3526
APPLICATIONS INFORMATION
Enable Input
As with any logic input, the enable pins,
ENA/ENB, must be driven to definitive
logic state at all times. Floating the
input can result in spurious operation.
Do not drive ENA/ENB below GND.
Fault Flag Output
Soft Start
The LND3526 provides a “Soft-Start”
function that ramps up the ON-current to
eliminate any excessive voltage drop
that could occur due to charging a
capacitive load in bus-powered
applications. The “Soft-Start”results
from a switch ON resistance, RON, that is
ramped down from high impedance to
140mΩ in milliseconds. This RON
ramping reduces the inrush current and
related transients occur when charging
capacitive loads; a requirement for
meeting the USB voltage drop
standards for bus-powered applications.
Supply Filtering
LDI recommends the use of a 0.1µF
to 1µF bypass capacitor to control
transients on he power supply pin.
The lack of suitable bypassing can
result in ringing on the IN input when
transients occur. This ringing, due to
supply lead inductance, could
damage LND3526 control circuitry if
the 5.5V maximum input rating is
exceeded.
O 3V to 5.5V
LND3526
IN
GND
0.1µF to 1µF
TIMING DIAGRAMS
Vout
tR
90%
10%
tF
90%
10%
Output Rise and Fall Times
• Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com •
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