LTC3785EUF#PBF

LTC3785EUF#PBF is Linear Technology’s (now Analog Devices) LTC3785 buck-boost DC‑DC controller. The EUF suffix is the package code and PBF indicates Pb‑free, RoHS‑compliant packaging.
What it does: a high‑efficiency regulator controller that can regulate an output when the input is above or below the target voltage (buck/boost capability), suitable for automotive, battery, and solar applications.
How it works: a current‑mode controller that requires external components (inductor, diode or synchronous MOSFETs) to form the buck‑boost converter; includes protections such as overcurrent and thermal shutdown and supports soft‑start.
Use: design a buck, boost, or buck‑boost supply around this IC; consult the LTC3785 data sheet for exact pinout, recommended external components, and application notes.
Note: suffix details mainly affect packaging and Pb‑free status; check the current data sheet for precise electrical specs and options.

Direct equivalents aren’t exact. LTC3785EUF#PBF is a 4‑switch buck–boost controller; closest cross‑refs from other vendors are 60V buck–boost controllers such as TI LM5170/LM5171. Other vendors’ 60V buck–boost controllers may serve as alternatives but pinouts/features differ. For an exact cross‑reference, use the distributor/ADI cross‑reference tool or contact LTC/Analog Devices.

Here are the typical features of the LTC3785EUF#PBF (high‑voltage, buck/boost controller in EUF package):
- Wide input range: 4V to 60V
- Buck, boost, and buck-boost capability (high/low-side FETs for synchronous operation)
- Interleaved multi-phase operation for improved efficiency and reduced input ripple
- Synchronous rectification with integrated high-side and low-side FET drivers
- Current‑mode control with programmable current limit and slope compensation
- Fixed switching frequency (about tens to hundreds of kHz; frequency adjustable via external components)
- External compensation and loop stability via compensation network
- Robust protections: overcurrent/short-circuit, overvoltage, undervoltage, thermal shutdown
- Soft-start, output tracking, enable input, and power‑good signaling
- Wide operating temperature range and RoHS-compliant in EUF package
Note: exact figures (e.g., switching frequency, individual load current capability) depend on external components and the specific board design.

- Pin count: 32 pins (package code EUF, a 32-pin QFN/LQFN-type package).
- Function: A dual-phase synchronous buck controller (external MOSFET drive) for multiphase step-down converters. It provides voltage- and current-mode control, soft-start, enable/disable, and protections (overcurrent/short-circuit/overvoltage) for high-efficiency power-supply regulation.

- Manufacturer: Analog Devices, Inc. (LTC prefixes come from Linear Technology, which Analog Devices acquired in 2017).
- What kind of company: A global semiconductor company that designs and manufactures analog, mixed-signal, and power-management integrated circuits.

LTC3785EUF#PBF is a wide-input, high-efficiency DC-DC controller for multiphase/buck regulators. Typical application areas include:
- Automotive power systems (12–60V class) requiring high-current, multi-rail regulators
- Industrial equipment and motor drives
- Telecom and networking power supplies
- Server/multi-rail DC-DC modules (3.3V/5V/1.8V rails)
- Battery-powered devices and portable instrumentation
- Solar/battery energy-harvesting power converters
It’s used to generate low-voltage rails from higher-voltage sources with high efficiency, enabling interleaved/multi-phase buck regulation and sequencing.

LTC3785EUF#PBF uses a Pb-free 32‑lead QFN package (EUF code).