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Texas Instruments LM3503SQX-35/NOPB — DC-DC Power Modules

Texas Instruments LM3503SQX-35/NOPB DC-DC Boost Regulator

MPNLM3503SQX-35/NOPB
Obsolete

Texas Instruments LM3503SQX-35/NOPB, DC-DC Regulator, Step-Up (Boost), 1MHz, 35V Output, 750mA Switch, 16-WFQFN Exposed Pad, -40°C~85°C.

Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3503SQX-35/NOPB 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)
TopologyStep-Up (Boost)
ApplicationsBacklight
Case16-WFQFN Exposed Pad
Internal switchYes

Product details

Boost regulator for dual-channel LED backlight

It integrates two output channels, each capable of sinking up to 750 mA (switch current), with a regulated output voltage up to 35 V. Dimming control supports both analog and PWM methods, giving the designer flexibility to adjust brightness without external components for PWM generation. The switching frequency is fixed at 1 MHz, which allows the use of small inductors and ceramic capacitors, shrinking the overall solution footprint.

For BOM lines requiring this exact part, supply is limited to independent distribution and broker inventory.

Frequently asked questions

What is the replacement for LM3503SQX-35/NOPB?

No official replacement or successor is listed by the manufacturer. For a pin-compatible alternative, review the LM3503 family base part number (LM3503) for any active variants; otherwise, a design review is needed to select a functionally equivalent boost regulator from TI's current portfolio.