LT3757IDD

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LT3757IDD

IC REG CTRLR MULT TOPOLOGY 10DFN

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Spezifikationen

Supplier Analog Devices Inc.
Package Tube
ProductStatus Obsolete
OutputType Transistor Driver
Function Step-Up, Step-Up/Step-Down
OutputConfiguration Positive and Negative
Topology Boost, Flyback, SEPIC
NumberofOutputs 1
OutputPhases 1
Voltage-Supply(Vcc/Vdd) 2.9V ~ 40V
Frequency-Switching 100kHz ~ 1MHz
SynchronousRectifier No
ClockSync Yes
ControlFeatures Enable, Frequency Control, Soft Start
OperatingTemperature -40°C ~ 125°C (TJ)
MountingType Surface Mount
Package/Case 10-WFDFN Exposed Pad

Übersicht

Description

LT3757IDD is Linear Technology’s (now Analog Devices) high‑voltage, fixed‑frequency, current‑mode DC–DC controller. It is used to implement buck, boost, or buck‑boost regulators with external MOSFETs. The “IDD” suffix denotes the industrial/extended temperature package.
Key features (typical): wide input range (up to ~60 V), adjustable switching frequency, peak current limit, current‑mode control for fast transient response, soft‑start, enable/shutdown, overvoltage and thermal protection. It requires external MOSFETs and support components (inductor, diode, feedback network) to form a complete converter.
Typical applications: automotive power supplies, industrial/telecom DC‑DC converters, battery chargers, and other harsh‑environment point‑of‑load regulators.
For exact electrical specs, package details, and application notes, refer to the LT3757IDD datasheet. If you want, I can summarize the key specs or outline a basic schematic for a buck or buck‑boost implementation.

Features

Here are the typical features of the LT3757IDD (high‑level summary):
- High‑voltage dc-dc controller for LED drivers and other DC‑DC apps
- Wide input voltage range suitable for automotive/industrial use
- Buck, boost, or buck‑boost operation with external N‑channel MOSFETs
- Current‑mode control with programmable switching frequency
- Regulated output current via sense resistor (ideal for LED strings)
- Programmable soft‑start and PWM/analog dimming inputs
- Protections: overcurrent/short‑circuit (often with hiccup), overvoltage, undervoltage lockout, and thermal shutdown
- Low quiescent current and fast transient response
- Optional synchronization/remote control capability
- Industrial temperature grade (suffix IDD) with suitable packaging
Note: exact electrical specs (voltage ranges, current limits, packaging) are in the datasheet; confirm for your specific lot.

Package

LT3757IDD uses an 8-pin MSOP package (MSOP-8) with industrial temperature range (-40°C to +125°C).

Pinout

- Pin count: 16 pins (16‑lead package).
- Function: LT3757IDD is a high‑voltage buck‑boost LED driver with constant‑current regulation. It drives an external inductor, diode, and sense resistor to regulate LED current. Key roles: VIN and GND power pins, LX switch node, BOOT for high‑side gate drive, FB for current regulation, ISET/IS (current‑set and sense), EN (enable), and DIM (brightness dimming). Includes protection features and a thermal/ pad for dissipation.

Manufacturer

Manufacturer: Analog Devices, Inc. (ADI). The LT3757IDD was originally from Linear Technology; Linear Technology is now part of Analog Devices.
What kind of company: A multinational semiconductor company that designs and manufactures analog, mixed-signal, and DSP ICs for a wide range of applications.

Application

- High-voltage, wide-input, constant-current LED driver (buck/boost)
- LED backlighting for LCDs
- Automotive and off-line LED lighting
- Architectural and signage lighting
- Street lighting and solar/battery-powered LED systems

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