Skip to main content
Log in
Texas Instruments LM3503SQ-44/NOPB — Power Management (PMIC / Gate Driver)

LM3503SQ-44/NOPB Texas Instruments LED Driver, Obsolete

MPNLM3503SQ-44/NOPB
Obsolete

Texas Instruments LM3503SQ-44/NOPB, DC DC Regulator, Step-Up (Boost) topology, 1 MHz switching frequency, 44 V output, 2 channels, 750 mA (switch) current, Analog and PWM dimming, 16-WFQFN exposed pad package, industrial temperature range -40°C to 85°C.

$1.1900Ref. price · indicative, final on quote
Packaging16-WFQFN Exposed Pad
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3503SQ-44/NOPB specifications
ParameterValue
TypeDC DC Regulator
MountingSurface Mount
Voltage - output44V
Supply voltage5.5V
Current - output (Channel)750mA (Switch)
Frequency1MHz
I/O channels2
Operating temperature-40°C~85°C(TA)
DimmingAnalog, PWM
PackageTape & Reel (TR); Cut Tape (CT)
TopologyStep-Up (Boost)
ApplicationsBacklight
Case16-WFQFN Exposed Pad
Internal switchYes

Product details

1 MHz boost regulator for backlight LED drive

The LM3503SQ-44/NOPB is a DC DC Regulator from Texas Instruments using a Step-Up (Boost) topology, switching at 1 MHz to drive LED backlight strings. It delivers up to 44 V output across two channels, each capable of 750 mA (switch) current, with both Analog and PWM dimming control for brightness adjustment.

No official successor is named in the available records.

Housed in a 16-WFQFN Exposed Pad package (supplier device package 16-WQFN 4x4 mm), the part requires a surface-mount assembly process.

Frequently asked questions

What is a good replacement for LM3503SQ-44/NOPB?

No official replacement is listed in the available records. A functional peer is the LM2703MF-ADJ/NOPB, also a DC DC Regulator boost converter for backlight, but it offers a single output channel at 0.35 A switch current versus the LM3503SQ-44/NOPB's two channels at 750 mA. Verify the output current and channel count against your load before substituting.

Does LM3503SQ-44/NOPB support PWM dimming?

Yes. The device supports both Analog and PWM dimming methods.