LTC3855EUJ#PBF

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LTC3855EUJ#PBF

IC REG CTRLR BUCK 40QFN

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規格

Supplier Analog Devices Inc.
Package Tube
Series PolyPhase®
ProductStatus Active
OutputType Transistor Driver
Function Step-Down
OutputConfiguration Positive
Topology Buck
NumberofOutputs 2
OutputPhases 2
Voltage-Supply(Vcc/Vdd) 4.5V ~ 38V
Frequency-Switching 250kHz ~ 770kHz
DutyCycle(Max) 95%
SynchronousRectifier Yes
ClockSync No
ControlFeatures Current Limit, Enable, Frequency Control, Phase Control, Power Good, Soft Start, Tracking
OperatingTemperature -40°C ~ 85°C (TA)
MountingType Surface Mount
Package/Case 40-WFQFN Exposed Pad

概述

Description

LTC3855EUJ#PBF is a dual, multiphase synchronous buck regulator controller from Linear Technology (now Analog Devices). It drives two external N-channel MOSFETs to build a high-current DC-DC converter with interleaved or phased operation for improved efficiency and fast transient response.
Key features (conceptual):
- Dual-channel, high-current step-down controller with current-mode control
- Programmable switching frequency; supports interleaved/dual-phase operation
- Built-in protections: overcurrent, UVLO/OVP, thermal monitoring
- Soft-start, remote sense, and compensation options for stable regulation
- Requires external MOSFETs and passive components for output setting
- Suitable for high-power rails in telecom, datacom, and industrial applications
Packaging/packing:
- EUJ denotes the package variant; #PBF indicates RoHS-compliant, lead-free.
For exact electrical specs (input range, output voltage/current, frequency range, pinout), consult the LTC3855 datasheet.

Features

Here are the key features of LTC3855EUJ#PBF (per datasheet):
- Two-phase interleaved synchronous buck controller (external MOSFETs) for multiphase VRMs
- Wide input voltage range (up to about 60V)
- Programmable switching frequency (several hundred kHz range)
- Current-mode control with cycle-by-cycle current limit
- Adjustable output voltage via feedback; supports remote sense
- Phase balancing and droop/current sharing for multiple rails
- Enable input, soft-start, and Power-Good signaling
- Protections: undervoltage lockout, overvoltage, overcurrent, thermal shutdown
- High-efficiency synchronous rectification
- Pb-free 32-pin LQFP (EUJ) package (PBF)
Note: For exact electrical specs (exact voltage range, frequency range, and pinouts), refer to the official datasheet.

Package

Package type: 20‑lead TSSOP (Thin Shrink Small Outline Package), Pb‑free (PBF).

Pinout

- Pin count: 16 pins (16-pin package for LTC3855EUJ#PBF).
- Function: Dual synchronous buck regulator controller (two PWM-controlled switching regulators) for multi-rail voltage regulation, with gate-drive outputs, current sensing, soft-start, enable, and overcurrent protection features.

Manufacturer

Manufacturer: Analog Devices, Inc. (ADI). The LTC prefix comes from Linear Technology, which ADI acquired in 2017; LTC3855EUJ#PBF is part of that lineage.
What kind of company: Analog Devices is a multinational semiconductor company that designs and manufactures analog, mixed-signal, and DSP integrated circuits for power management, communications, automotive, and industrial applications.

Application

Applications:
- High-efficiency DC-DC conversion and multi-rail power for telecom and networking equipment
- Servers, data centers, and desktop computer power regulation
- Point-of-load (POL) regulation using multiphase synchronous buck
- Automotive and industrial power-supply systems
- Battery-powered systems needing compact, high-performance buck regulation

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