LT3757IDD

LT3757IDD is a wide-input buck/boost controller from Linear Technology (now Analog Devices). It regulates an output voltage over a broad input range by driving external N-channel MOSFETs in a buck-boost topology, making it suitable for automotive, battery, and other applications where input can be above or below the desired output.
Key points:
- Wide input range and high efficiency with external MOSFETs, inductor, and feedback network.
- Current-mode control for fast transient response.
- Adjustable output via a resistor divider; soft-start for controlled startup.
- Protections: overcurrent/short-circuit, overvoltage, thermal shutdown, and undervoltage lockout.
- Packaging suffix “IDD” denotes a specific package variant of the part.
Use when you need a regulated supply from a highly variable source without using multiple regulators. For exact electrical specs, package details, and typical application circuit, refer to the LT3757IDD datasheet.

Direct drop-in equivalents for LT3757IDD do not exist. Closest substitutes are other high-voltage buck/boost LED-driver controllers from major vendors, e.g., TI LM3478/LM3479, Richtek buck-boost LED-driver family, Onsemi NCP series LED drivers, and Maxim/MAX1682x/MAX1686x series. Always verify Vin/Vout range, current sense, features, and pinout with a cross-reference tool.

- Pin count: 16 pins (16-pin package).
- Function: High‑voltage, switching LED driver controller. It regulates constant LED current via a sense resistor and feedback, typically using an external inductor and diode. It includes features such as enable/UVLO, soft‑start, PWM dimming, and protection (overcurrent/overvoltage).

Analog Devices, Inc. (ADI). ADI is a global semiconductor company that designs and manufactures analog, mixed-signal, and digital signal processing integrated circuits; it acquired Linear Technology (the original LT line) in 2017.

LT3757IDD is a high-efficiency DC-DC controller for wide-input buck/boost converters. Typical applications include:
- Automotive power electronics (12–24V systems, harsh environments)
- Industrial and telecom power supplies (high efficiency, multi-rail)
- Battery-powered devices and portable equipment (long run-time)
- Data-center and distributed power (point-of-load regulation)
- Renewable energy/off-grid systems (solar charging and battery regulation)
- General high-efficiency DC-DC conversion in embedded systems and adapters

8-pin DIP package (DIP-8).