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Texas Instruments LM3509SDE/NOPB — Power Management (PMIC / Gate Driver)

LM3509SDE/NOPB DC-DC Boost Regulator, I²C Dimming, 21V, 30mA

MPNLM3509SDE/NOPB
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Texas Instruments LM3509SDE/NOPB, DC DC Regulator, Step-Up (Boost) topology, I²C dimming, 21V output, 30mA per channel, 2 outputs, 1.27MHz, 10-WFDFN Exposed Pad, -40°C~85°C.

$2.8900Ref. price · indicative, final on quote
Texas Instruments LM3509SDE/NOPB datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3509SDE/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 regulator with I²C dimming for dual LED strings

Brightness control is handled via the I²C interface, allowing precise dimming of the LED strings without additional PWM components.

21 V output ceiling and dual-channel drive

With a maximum output voltage of 21 V, the LM3509SDE/NOPB can drive up to five or six series-connected white LEDs per channel, depending on their forward voltage. The two outputs are independent, so one channel can power the main display while the other drives a secondary indicator or keypad backlight, or both can be paralleled for higher current into a single string.

Frequently asked questions

Can LM3509SDE/NOPB be used for automotive backlight?

It is not listed as AEC-Q100 qualified, so it is not recommended for automotive-grade designs without additional qualification.