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Texas Instruments LM3509SD/NOPB — Power Management (PMIC / Gate Driver)

LM3509SD/NOPB – TI Boost LED Driver with I²C Dimming, Active

MPNLM3509SD/NOPB
Active

Texas Instruments LM3509SD/NOPB, DC-DC step-up (boost) regulator, 2 outputs, 30 mA per channel, I²C dimming, 1.27 MHz switching frequency, 10-WFDFN exposed pad package, -40°C to 85°C operation.

$2.8200Ref. price · indicative, final on quote
Texas Instruments LM3509SD/NOPB datasheet (PDF)
Packaging10-WFDFN Exposed Pad
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LM3509SD/NOPB specifications
ParameterValue
TypeDC DC Regulator
MountingSurface Mount
Voltage - output21V
Supply voltage5.5V
Current - output (Channel)30mA
Frequency1.27MHz
I/O channels2
Operating temperature-40°C~85°C(TA)
DimmingI²C
PackageTape & Reel (TR); Cut Tape (CT)
TopologyStep-Up (Boost)
ApplicationsBacklight
Case10-WFDFN Exposed Pad
Internal switchYes

Product details

Boost backlight driver with I²C dimming

The LM3509SD/NOPB is a Texas Instruments DC-DC step-up (boost) regulator designed for backlight applications, delivering two regulated outputs at 30 mA per channel with I²C dimming control.

Supply rail and output voltage ceiling

Internal switches simplify the layout — no external FET or boost diode needed, which cuts component count and keeps the BOM tight for high-volume backlight boards.

Packaging options include Tape & Reel and Cut Tape for the 10-WFDFN exposed pad package (3x3 mm 10-SON), suitable for automated assembly.

Frequently asked questions

How can I order or check stock for LM3509SD/NOPB?

The LM3509SD/NOPB is an active Texas Instruments part, ROHS3 compliant, and available through our sourcing desk. Submit an RFQ with your target quantity and lead-time requirement; we confirm current pricing and availability per order.

Does LM3509SD/NOPB have I²C dimming control?

Yes, the LM3509SD/NOPB uses I²C for dimming, allowing digital brightness control from a microcontroller or application processor without an extra PWM pin.

What is the closest alternative to LM3509SD/NOPB?

The LM2703MF-ADJ/NOPB is a single-output boost regulator (350 mA) with adjustable output, but it lacks I²C dimming and the dual-channel capability of the LM3509SD/NOPB. For two-channel I²C-controlled backlight, the LM3509SD/NOPB is the intended part.