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Analog Devices LT3954EUHE#PBF — Analog & Data Acquisition
Analog Devices

LT3954EUHE#PBF LED Driver, DC DC Regulator, 5A Switch

MPNLT3954EUHE#PBF
End of Life

Analog Devices LT3954EUHE#PBF, DC DC Regulator LED Driver, 1 Output, 5A Switch, 100kHz to 1MHz, Flyback/SEPIC/Buck/Boost, 36-QFN (5x6), -40°C to 125°C.

$10.87Ref. price · indicative, final on quote
LT3954EUHE#PBF datasheet
Packaging36-WFQFN, 28 Leads, Exposed Pad
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
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Specifications

LT3954EUHE#PBF Technical Specifications
ParameterValue
TypeDC DC Regulator
Mounting typeSurface Mount
Voltage4.5V
Current - output (Channel)5A (Switch)
Frequency100kHz ~ 1MHz
Number of outputs1
Operating temperature-40°C ~ 125°C (TJ)
DimmingAnalog, PWM
PackageTube
TopologyFlyback, SEPIC, Step-Down (Buck), Step-Up (Boost)
Case36-WFQFN, 28 Leads, Exposed Pad
Internal switchYes

Product details

What this LED driver brings to the board

The LT3954EUHE#PBF is a DC DC regulator LED driver with an integrated 5A switch. It handles flyback, SEPIC, buck, and boost topologies. Dimming is analog and PWM. Switching frequency is 100kHz to 1MHz. Operating temperature is -40°C to 125°C.

Package and mounting

It comes in a 36-lead WFQFN with exposed pad, 5x6 mm footprint. That's a surface-mount part with a thermal pad underneath that needs a solid via array to the ground plane to pull heat out. The datasheet layout recommendation is worth following — the pad is the main thermal path, and a skimpy copper pour will limit the 5A switch's duty cycle at high ambient.

Lifecycle and sourcing

ROHS3 compliant. The closest functional peer is the LT3955EUHE#PBF, which drops the switch current to 3.5A but shares the same pinout and topology set.

Frequently asked questions

What is the equivalent or alternative to LT3954EUHE#PBF?

The closest functional alternative is the LT3955EUHE#PBF, which shares the same pinout and topology but has a 3.5A switch instead of 5A. For a different package with 4A boost-only capability, consider the LT3952AEFE#PBF.

What does the 5A switch rating mean for my LED design?

The 5A rating is the peak switch current, not the continuous LED current. In a boost converter, you can typically drive a 1A LED string with good margin. For higher currents, derate based on input voltage and switching frequency.