LT3514IUFD

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LT3514IUFD

IC REG BCK ADJ 2A/1A TRPL 28QFN

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規格

Package Tube
ProductStatus Obsolete
Function Step-Down
OutputConfiguration Positive
Topology Buck
OutputType Adjustable
NumberofOutputs 3
Voltage-Input(Min) 3.2V
Voltage-Input(Max) 36V
Voltage-Output(Min/Fixed) 0.8V
Voltage-Output(Max) 36V
Current-Output 2A, 1A
Frequency-Switching 270kHz ~ 2.1MHz
SynchronousRectifier No
OperatingTemperature -40°C ~ 125°C (TJ)
MountingType Surface Mount
Package/Case 28-WFQFN Exposed Pad

概述

Description

LT3514IUFD is a Linear Technology (now Analog Devices) four-channel constant-current LED driver with an integrated switching regulator. It drives up to four LED strings from a single input, with independent current regulation per channel. Each channel uses an external sense resistor to set its current, maintaining a fixed current as input voltage or LED forward voltages vary. Features include PWM and analog dimming, fault protection (open/short-circuit), thermal shutdown, undervoltage lockout, and soft-start. The device supports buck, boost, or buck-boost configurations to cover a wide LED voltage range, enabling high efficiency across applications. The IUFD suffix denotes a specific package type and temperature rating; for exact details (pin count, pad arrangement, industrial vs. commercial Temp range), consult the LT3514 datasheet for the variant you’re using. This IC is well-suited for LED backlighting, signage, and multi-string LED applications requiring precise current control and dimming.

Features

LT3514IUFD features (concise):
- Four constant-current LED sinks (4-channel LED driver)
- Integrated boost regulator to drive high-V LED strings from a low-voltage supply
- Programmable channel currents via external sense resistors; good current matching
- Dim control: PWM dimming and DC dimming options
- Current balancing across channels; soft-start to reduce inrush
- Protection: open/short LED protection, undervoltage lockout, overcurrent, overtemperature, and fault reporting
- High efficiency switching regulator with fixed frequency operation (typical around 1 MHz)
- Suitable for backlighting/LCD and portable lighting applications
Note: specifics (range, exact current limits, package options) are in the datasheet for exact device configuration.

Package

The LT3514IUFD is supplied in a 16‑lead QFN (UFD) package, 3 mm × 3 mm with an exposed thermal pad for PCB heat-sinking.

Manufacturer

Manufacturer: Analog Devices, Inc. (originally Linear Technology — the LT brand; Linear Technology was acquired by Analog Devices in 2017).
What kind of company: Analog Devices is a U.S.-based multinational semiconductor company that designs, manufactures and markets high-performance analog, mixed-signal and digital signal-processing integrated circuits and power-management components for industrial, automotive, communications, consumer and aerospace applications.

Application

- LCD backlight for notebooks/tablets/monitors/TVs
- Automotive interior/exterior LED lighting and displays
- Signage and backlit keys
- Portable devices needing regulated LED strings
- General multi-string, high-efficiency LED lighting

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