LT3845EFE#TRPBF

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LT3845EFE#TRPBF

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IC REG CTRLR BUCK 16TSSOP

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Thông số kỹ thuật

thuộc tính Giá trị
Supplier Analog Devices Inc.
Package Tape & Reel (TR),Cut Tape (CT)
ProductStatus Active
OutputType Transistor Driver
Function Step-Down
OutputConfiguration Positive
Topology Buck
NumberofOutputs 1
OutputPhases 1
Voltage-Supply(Vcc/Vdd) 4V ~ 60V
Frequency-Switching 300kHz
SynchronousRectifier Yes
ClockSync Yes
ControlFeatures Enable, Frequency Control, Soft Start
OperatingTemperature -40°C ~ 125°C (TJ)
MountingType Surface Mount
Package/Case 16-TSSOP (0.173, 4.40mm Width) Exposed Pad

Tổng quan

Description

The LT3845EFE#TRPBF is a high‑efficiency, external‑MOSFET buck switching regulator controller from Linear Technology (Analog Devices). It’s designed to drive external N‑channel MOSFETs to build high‑current step‑down converters.
Key features
- Current‑mode PWM control with cycle‑by‑cycle current limit
- Programmable switching frequency
- Robust protections: UVLO, overcurrent/short‑circuit protection, and thermal shutdown
- Soft‑start and a feedback/enable mechanism for output regulation
Typical use
- Requires external MOSFETs and sense/feedback components to form a buck regulator
- Suitable for high‑efficiency point‑of‑load supplies in telecom, automotive, and computing
Package note
- EFE#TRPBF denotes the specific lead‑free package variant in Tape & Reel (Pb‑free) packaging. For exact electrical specs (input range, output current, efficiency, frequency range), consult the LT3845 datasheet.

Features

Here are the typical features of the LT3845EFE#TRPBF (Pb-free, Tape & Reel):
- Wide input range up to about 60V, suitable for automotive/industrial use
- Single-channel constant-current LED driver
- Buck topology using an external N-channel MOSFET
- LED current programmed via sense resistor (adjustable)
- Dimming: PWM dimming input and analog dimming capability
- Robust protections: open-LED and short-LED protection, overcurrent, overvoltage, thermal shutdown
- Undervoltage lockout and soft-start to prevent inrush
- Fixed switching frequency (set with external components) for easy compensation
- High efficiency due to proper regulation and fast transient response
- Fault latch/flag signaling for system monitoring
- Small package with EFE code and Pb-free, Tape & Reel packaging
For exact electrical specs (current range, voltage limits, frequency, etc.), please consult the LT3845 datasheet.

Pinout

- Pin count: 8 pins (MSOP-8 package, listed as LT3845EFE#TRPBF).
- Function: High-voltage switching controller for off-line flyback LED drivers. It provides current‑mode control and drives an external MOSFET via the GATE pin, using IS (current sense) and FB (feedback) with COMP (compensation) to regulate output current. Other pins typically include VIN/GND, EN/UVLO, and the switch node (DRAIN/SW).

Manufacturer

The LT3845EFE#TRPBF is manufactured by Linear Technology Corporation, an American semiconductor company that designs and manufactures analog, mixed-signal, and power-management integrated circuits. Linear Technology is now part of Analog Devices.

Application

LT3845EFE#TRPBF is a high‑voltage, current‑mode buck controller. Common application areas include:
- Automotive power supplies (wide Vin, transient tolerance)
- Industrial and telecom DC‑DC converters
- CPU/memory VRMs and multi‑phase buck regulators
- Battery‑powered systems with wide input range
- Front‑end/hot‑swap or post‑regulation stages
- Distributed power architectures and board‑level power modules
It enables efficient, compact DC‑DC regulation suitable for harsh environments.

Package

The LT3845EFE#TRPBF uses a 16-lead TSSOP package (Pb-free), with Tape & Reel packaging.

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