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Texas Instruments LM3503SQ-35 — Power Management (PMIC / Gate Driver)

LM3503SQ-35 DC DC Regulator, 35V Output, 1MHz Boost

MPNLM3503SQ-35
Obsolete

Texas Instruments LM3503SQ-35, DC DC Regulator, Step-Up (Boost) topology, 35V output, 1MHz switching, 2 outputs, Analog/PWM dimming, 16-WFQFN exposed pad, -40°C to 85°C.

$1.5100Ref. price · indicative, final on quote
Texas Instruments LM3503SQ-35 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3503SQ-35 specifications
ParameterValue
TypeDC DC Regulator
MountingSurface Mount
Voltage - output35V
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

Boost LED driver with 35 V output ceiling

The LM3503SQ-35 is a DC-DC regulator using a step-up (boost) topology, designed primarily for backlight applications. It integrates two outputs with analog and PWM dimming control, switching at 1 MHz to keep the inductor small. Output voltage reaches 35 V.

Obsolete — plan for replacement

New designs should avoid it; existing BOM lines will need to source from surplus or broker channels. The 16-WFQFN package with exposed pad (4x4 mm) is a standard footprint, so a pin-compatible drop-in from another manufacturer is unlikely without a layout change. Verify the pinout against any proposed alternative before committing.

Frequently asked questions

What is the equivalent of LM3503SQ-35?

No direct pin-compatible equivalent is documented. The part is obsolete without a successor, so any replacement will require a PCB layout change and revalidation of the boost converter parameters.