LM3503SQ-44/NOPB National Semiconductor, LM3503SQ-44/NOPB Datasheet - Page 18

• Manufacturer Part Number: LM3503SQ-44/NOPB
• Description: IC LED DRIVER WHTE BCKLGT 16-LLP
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: Backlight, White LEDr

Specifications of LM3503SQ-44/NOPB

• Constant Current: Yes
• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 2
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: White LED
• Frequency: 800kHz ~ 1.2MHz
• Voltage - Supply: 2.5 V ~ 5.5 V
• Voltage - Output: 41 V ~ 42 V
• Mounting Type: Surface Mount
• Package / Case: 16-LLP
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 750mA
• Internal Switch(s): Yes
• Efficiency: 80%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM3503SQ-44; LM3503SQ-44TR

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Application Information
capacitor can be placed in parallel with C
frequency noise to ground. The output capacitor, C
be placed close to the IC and be connected between the
V
C
directly effects output voltage ripple and efficiency. The cur-
rent setting resistor, R1, should be kept close to the Fb pin to
OUT1
OUT
capacitor can increase the series resistance, which
and Pgnd pins. Any copper trace connections for the
IN
(Continued)
to shunt any high
OUT
, must
18
minimize copper trace connections that can inject noise into
the system. The ground connection for the current setting
resistor network should connect directly to the Pgnd pin. The
Agnd pin should be tied directly to the Pgnd pin. Trace
connections made to the inductor should be minimized to
reduce power dissipation and increase overall efficiency
while reducing EMI radiation. For more details regarding
layout guidelines for switching regulators, refer to Applica-
tions Note AN-1149.