Analog Devices LT3755EUD-2#PBF — Discrete Semiconductors
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RoHS Compliant · Lead-Free EIA-481 Standard
Analog Devices / Discrete Semiconductors

LT3755EUD-2#PBF LED Driver Controller, 100kHz-1MHz, 16-QFN

MPN LT3755EUD-2#PBF
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Analog Devices LT3755EUD-2#PBF, DC DC Controller, LED Driver, 1 Output, 100kHz ~ 1MHz, 4.5V to 40V Supply, Analog/PWM Dimming, Surface Mount 16-WFQFN (3x3mm).

In Stock: 7,266 pcs
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[SPEC] Essential Parameters Snapshot Full Specifications (11)
Package / Case 16-WFQFN Exposed Pad
Supply Voltage 4.5V

Full Technical Specifications

11 Parameters
LT3755EUD-2#PBF specifications
Parameter / AttributeSpecification / Value
TypeDC DC Controller
MountingSurface Mount
Supply voltage4.5V
Frequency100kHz ~ 1MHz
I/O channels1
Operating temperature0°C ~ 125°C (TJ)
DimmingAnalog, PWM
PackageTube
TopologyFlyback, SEPIC, Step-Down (Buck), Step-Up (Boost)
Case16-WFQFN Exposed Pad
Internal switchNo
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Technical Details & Description

Dimming — two paths, one pin

Dimming is handled through both analog and PWM methods. Analog dimming adjusts the LED current linearly; PWM dimming switches the LED on and off at a duty cycle, giving you a wider dimming ratio without color shift. The same pin handles both, so the firmware team can choose the method that fits the application — no extra pin needed.

Switching frequency — set it where you need it

The oscillator is programmable from 100 kHz to 1 MHz via a single resistor. Lower frequency cuts switching losses; higher frequency shrinks the inductor and capacitor. For EMI-sensitive designs, synchronizing to an external clock is possible — the datasheet covers the sync range.

Package and thermal

Comes in a 16-lead WFQFN with exposed pad (3 mm × 3 mm). Surface-mount only; no through-hole option.

ROHS3 compliant (lead-free). No AEC-Q100 qualification listed, so for automotive designs verify the customer's own qualification requirements against the 0°C to 125°C rating.

Frequently asked questions

How does LT3755EUD-2#PBF compare to the standard LT3755EUD?

Both are the same DC/DC controller with identical topology support (buck, boost, SEPIC, flyback), same 4.5 V to 40 V input range, and same analog/PWM dimming. The -2 suffix indicates a variant with a different switching frequency range or internal compensation — the standard LT3755EUD and LT3755EUD-1#PBF are the closest functional peers. For exact differences, compare the oscillator programming curves in the respective datasheets.

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