LT3955EUHE#PBF Analog Devices Integrated Circuit (Other) In Stock
The LT3955EUHE#PBF is a high-efficiency buck-boost LED driver IC from Analog Devices (Linear Technology) switching at 1 MHz, capable of driving up to 12 LED segments in a 36-pin QFN package. It supports wide input voltage ranges with programmable current regulation for consistent LED brightness. Suited for automotive and industrial LED lighting designs requiring stable output despite fluctuating supply voltages.
- Manufacturer
- Analog Devices
- Package
- Other
- Pin Count
- 28
- Lifecycle
- ACTIVE
- Datasheet
- LT3955EUHE#PBF Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $5.1500(MOQ 1)
- Temp Range
- ?°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LT3955EUHE#PBF?
- Buck-boost topology supporting LED drive across wide input voltage ranges above and below output
- 1 MHz switching frequency reducing external inductor and capacitor size
- Controls up to 12 LED segments with programmable constant-current regulation
- 36-pin QFN package (5 mm x 6 mm) with exposed pad for thermal dissipation
- JESD-609 e3 lead-free compliant, RoHS-ready for automotive and industrial designs
- Single-function LED driver architecture simplifying EMI management at 1 MHz
What is LT3955EUHE#PBF used for?
The LT3955EUHE#PBF is used in automotive exterior lighting systems including LED headlamps, daytime running lights, and tail light assemblies where the supply rail fluctuates between 6 V and 42 V during cold-crank and load-dump events. Industrial LED signage and architectural lighting installations benefit from its 1 MHz switching frequency and 12-segment drive capability, enabling compact driver boards with minimal filtering components. It also serves transportation and emergency vehicle lighting requiring reliable constant-current LED drive across wide temperature ranges.
What are the specifications of LT3955EUHE#PBF?
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1836 |
| YTEOL | 10 |
| Interface IC Type | LED DISPLAY DRIVER |
| JESD-30 Code | R-PQCC-N28 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Number of Segments | 12 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | LCC28/36,.2X.24,20 |
| Package Shape | RECTANGULAR |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Supply Voltage-Max | 60V |
| Supply Voltage-Min | 4.5V |
| Supply Voltage-Nom | 24V |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Temperature Grade | OTHER |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | BOTTOM |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Thailand |
Where can I find the LT3955EUHE#PBF datasheet?
LT3955EUHE#PBF Datasheet DownloadOfficial datasheet from Analog Devices
What are equivalent replacements for LT3955EUHE#PBF?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
Why does the LT3955EUHE#PBF use a buck-boost topology instead of a simple buck converter for LED driving?
A buck-boost topology allows the LT3955EUHE#PBF to regulate LED current even when the input supply voltage is equal to, lower than, or higher than the forward voltage of the LED string. In automotive designs where the 12 V battery rail can swing from 6 V during cold-crank to 42 V during load-dump, a pure buck converter would lose regulation, while the buck-boost maintains stable constant-current output across this entire 36 V input range, protecting the LEDs from thermal runaway.
How does the 1 MHz switching frequency of the LT3955EUHE#PBF reduce BOM cost and PCB size?
Operating at 1 MHz allows the LT3955EUHE#PBF to use inductors as small as 4.7 µH and ceramic output capacitors under 10 µF, compared to 47 µH and 47 µF typically required at 200 kHz. Smaller passive components directly reduce PCB area and total BOM cost, and the 1 MHz frequency also pushes switching harmonics above the AM radio band, simplifying EMI filter design in automotive lighting applications.
What is the maximum number of LED segments the LT3955EUHE#PBF can independently control?
The LT3955EUHE#PBF supports up to 12 LED segments, each with independently programmable current levels set by external resistors. This 12-segment capability makes it suitable for sophisticated automotive rear combination lamps that integrate stop, tail, turn, and reverse functions on a single driver IC, reducing system board count and wiring complexity compared to multi-IC solutions.
How does the 36-pin QFN package of the LT3955EUHE#PBF aid thermal management in high-power LED applications?
The 36-pin QFN (6 mm x 6 mm body) includes an exposed thermal pad on its underside that, when soldered to a PCB copper pour connected to ground planes or thermal vias, provides a low-resistance thermal path capable of dissipating several watts without heatsinks. This is critical in LED driver designs where the IC may operate at 85°C ambient, ensuring junction temperatures remain within the device's rated operating range and extending LED driver lifetime.
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About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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| 1+ | $11.6200 | $11.62 |
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