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Analog Devices LT3954EUHE#PBF — Analog & Data Acquisition
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RoHS Compliant · Lead-Free EIA-481 Standard
Analog Devices / Analog & Data Acquisition

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

MPN LT3954EUHE#PBF
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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.

In Stock: 700 pcs
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[SPEC] Essential Parameters Snapshot Full Specifications (12)
Package / Case 36-WFQFN, 28 Leads, Exposed Pad
Supply Voltage 4.5V
Output / Current 5A (Switch)

Full Technical Specifications

12 Parameters
LT3954EUHE#PBF specifications
Parameter / AttributeSpecification / Value
TypeDC DC Regulator
MountingSurface Mount
Supply voltage4.5V
Current - output (Channel)5A (Switch)
Frequency100kHz ~ 1MHz
I/O channels1
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
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Technical Details & Description

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.

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.

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.

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