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Texas Instruments LP8556SQE-E00/NOPB — Analog & Data Acquisition

LP8556SQE-E00/NOPB LED Driver, DC-DC Boost, 5-Channel, 25mA

MPNLP8556SQE-E00/NOPB
End of Life

Texas Instruments LP8556SQE-E00/NOPB, DC DC Regulator, Backlight LED Driver, Boost Topology, 5 Outputs, 25mA per Channel, PWM Dimming, 312/625/1250kHz, 24-WQFN.

$2.06688Ref. price · indicative, final on quote
Texas Instruments LP8556SQE-E00/NOPB datasheet (PDF)
Packaging24-WFQFN Exposed Pad
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LP8556SQE-E00/NOPB specifications
ParameterValue
TypeDC DC Regulator
MountingSurface Mount
Voltage - output16V ~ 34.5V
Supply voltage2.7V
Current - output (Channel)25mA
Frequency312kHz, 625kHz, 1250kHz
I/O channels5
Operating temperature-30°C ~ 85°C (TA)
DimmingPWM
PackageTape & Reel (TR); Cut Tape (CT)
TopologyStep-Up (Boost)
ApplicationsBacklight
Case24-WFQFN Exposed Pad
Internal switchYes

Product details

Five-channel boost LED driver for LCD backlighting

It integrates five regulated current sinks, each rated for 25 mA.

Switching frequency and inductor selection

The three programmable switching frequencies give the designer control over the inductor footprint and efficiency curve. Running at 1250 kHz shrinks the inductor footprint but increases switching losses.

Output voltage compliance and string matching

The boost converter regulates the output voltage to the highest forward voltage among the five LED strings plus the headroom of the current sinks. The 16 V to 34.5 V output range covers most medium-format LCD panels.

It is fully RoHS3 compliant, which simplifies qualification for EU-market products and avoids the need for a separate exemption review.

Frequently asked questions

LP8556SQE-E00/NOPB equivalent or replacement?

The LM2703MF-ADJ/NOPB is a single-output boost regulator also intended for backlight applications, but it drives only one channel at up to 0.35 A. It is not a pin-compatible or functional replacement for the five-channel LP8556. No direct second-source alternate is listed in the official records.

What is LP8556SQE-E00/NOPB's listed dimming method?

Dimming is performed via PWM, controlled through the PWM input pin. The internal PWM generator modulates the LED current sinks to achieve the desired brightness level.