SC441ATETRT Semtech, SC441ATETRT Datasheet - Page 17

• Manufacturer Part Number: SC441ATETRT
• Description: TVS
• Manufacturer: Semtech

Specifications of SC441ATETRT

• Constant Current: *
• Constant Voltage: *
• Topology: *
• Number Of Outputs: *
• Internal Driver: *
• Type - Primary: *
• Type - Secondary: *
• Frequency: *
• Voltage - Supply: *
• Voltage - Output: *
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP Exposed Pad, 20-eTSSOP, 20-HTSSOP
• Operating Temperature: *
• Current - Output / Channel: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: SC441ATETRTTR

SC441A
Applications Information (continued)
Layout Guidelines
The SC441A contains a boost converter and the place-
ments of the power components outside the SC441A
should follow the layout guidelines of a general boost
converter. The evaluation application circuit on page 17
will be used as an example. C2 and C3 are input decou-
pling capacitor for SC441A VIN pin and main power input.
C2,C3 should be placed as close as possible to the VIN pin
to achieve the best decoupling performance.
To minimize the switching noise, The switching loop
formed by input decoupling capacitors, internal switch,
output Schottky diode and output capacitors must be
minimized. The LED current programming resistor(R6),
compensation network (R9,C5,C7) and soft start capacitor
(C6) should be placed as close as possible to SC441A. The
C14~C17 are decoupling capacitors for LED current source
which prevent IO pins from noise influence. C14~C17
should be placed close to each corresponding IO pin.
Use an isolated local AGND plane underneath the con-
troller and tie it to the negative side of output capacitor
through R14 for better noise immunity.
17
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