LT3957AEUHE#PBF Analog Devices Integrated Circuit (Other) In Stock
Analog Devices LT3957AEUHE#PBF is an automotive-grade current-mode PWM DC/DC controller supporting flyback and boost topologies with a 3 V to 40 V input range and 1.2 MHz switching frequency in a 28-pin QFN package. Designed for single-output isolated and non-isolated power conversion in AEC-Q100 automotive applications. Available with worldwide shipping.
- Manufacturer
- Analog Devices
- Package
- Other
- Pin Count
- 28
- Lifecycle
- ACTIVE
- Datasheet
- LT3957AEUHE#PBF Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $4.0700(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 LT3957AEUHE#PBF?
- 3 V to 40 V input range with 1.2 MHz switching frequency enabling compact inductor and transformer selection in flyback and boost designs
- Current-mode PWM control with automotive AEC-Q100 qualification for reliable operation in harsh vehicle environments
- 28-pin QFN EP package providing low thermal resistance and small PCB footprint for space-constrained automotive power modules
What is LT3957AEUHE#PBF used for?
The LT3957AEUHE#PBF is used in automotive isolated flyback power supplies and boost converters where a 3 V to 40 V input must generate regulated outputs for infotainment, ADAS, body control modules, and LED lighting drivers. Its 1.2 MHz switching frequency allows the use of small, lightweight magnetics suited for under-hood and instrument-cluster modules with tight board space constraints. The AEC-Q100 qualification makes it appropriate for passenger vehicle and light commercial vehicle designs requiring long-term reliability over the automotive temperature range.
What are the specifications of LT3957AEUHE#PBF?
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1836 |
| YTEOL | 10 |
| Analog IC - Other Type | SWITCHING REGULATOR |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 40V |
| Input Voltage-Min | 3V |
| Input Voltage-Nom | 24V |
| JESD-30 Code | R-PQCC-N38 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Output Current-Max | 6.8A |
| Output Voltage-Nom | 24V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | LCC28/36,.19X.23,20 |
| Package Shape | RECTANGULAR |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Surface Mount | YES |
| Switcher Configuration | BOOST |
| Switching Frequency-Max | 1200kHz |
| Technology | BIPOLAR |
| Temperature Grade | OTHER |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| 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 LT3957AEUHE#PBF datasheet?
LT3957AEUHE#PBF Datasheet DownloadOfficial datasheet from Analog Devices
What are equivalent replacements for LT3957AEUHE#PBF?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What input voltage range and switching frequency does LT3957AEUHE#PBF support, and how does that affect transformer size in a flyback design?
The LT3957AEUHE#PBF operates from a 3 V to 40 V input with a nominal 24 V input and a programmable switching frequency up to 1.2 MHz. At 1.2 MHz, the flyback transformer core can be significantly reduced versus a 100 kHz design because higher frequency requires fewer turns for the same power transfer, enabling a transformer footprint reduction of 4× to 8× in area compared to lower-frequency counterparts, which is critical for compact automotive power modules.
Which automotive power supply topologies can LT3957AEUHE#PBF implement, and what isolation options does it support?
The LT3957AEUHE#PBF supports both isolated flyback and non-isolated boost topologies in a single device. In flyback mode, the controller drives an external power MOSFET through a transformer, providing galvanic isolation between input and output rails — a requirement for automotive circuits where the secondary output must be isolated from the vehicle battery ground. In boost mode, it can step up the 3 V to 40 V input to a higher output voltage for bias supplies or LED string drivers without a transformer.
How does the AEC-Q100 qualification of LT3957AEUHE#PBF affect its use in passenger vehicle versus industrial applications?
AEC-Q100 qualification means the LT3957AEUHE#PBF has passed stress tests including high-temperature operating life at 125°C, temperature cycling from -40°C to 150°C, humidity and ESD tests specific to automotive supply chains. For passenger vehicle designs, this qualification is often a hard procurement requirement from Tier 1 suppliers. In industrial applications the same part can be used without the AEC qualifier, but the automotive-grade qualification provides an extra reliability margin for industrial designs operating between -40°C and 105°C without additional screening.
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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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