Specifications
| Attribute | Value |
| Package / Case | Tape & Reel (TR),Cut Tape (CT) |
| Part Status | Active |
| Type | DC DC Controller |
| Topology | Flyback, SEPIC, Step-Down (Buck), Step-Up (Boost) |
| Internal Switch(s) | No |
| Number of Outputs | 1 |
| Voltage - Supply (Min) | 4.5V |
| Voltage - Supply (Max) | 40V |
| Frequency | 100kHz ~ 1MHz |
| Dimming | Analog, PWM |
| Operating Temperature | 0°C ~ 125°C (TJ) |
| Mounting Type | Surface Mount |
Overview
Description
LT3755EUD-2#TRPBF is a high-voltage, wide-input, constant-current LED driver/controller from Analog Devices (formerly Linear Technology). It integrates a high-voltage power switch and control circuitry to drive LED strings in buck, boost, or buck-boost configurations, using a sense resistor to regulate LED current precisely. It supports analog and PWM dimming, soft-start, and robust protections (UVLO, overcurrent/overvoltage, short-circuit, thermal shutdown). The EUD package with -2#TRPBF denotes the Pb-free, tape-and-reel version and the package code sequence. Typical applications include automotive and industrial lighting, LED backlighting, and signage. For implementation, reference the datasheet for pinout, recommended external components, and example schematics.
Features
Here are the main features of LT3755EUD-2#TRPBF (high-level, from the datasheet):
- Dual, constant-current LED driver controller designed to work with external MOSFETs
- Wide input voltage range suitable for automotive/high-voltage applications
- Independent current regulation per channel via sense resistor
- Fixed-frequency, current-mode switching for stable regulation and fast transient response
- Dimming options: PWM dimming input and DC/analog dimming capability
- Protection and reliability: overcurrent/short-circuit protection, overvoltage protection, undervoltage lockout, and thermal protection
- Soft-start to reduce inrush and prevent LED flicker
- Auto-retry on fault conditions; robust fault handling
- External components determine LED current and topology flexibility
- Packaging: EUD with TRPBF tape-and-reel
Note: For exact electrical specs (input range, current limits, efficiency, dimming ratios, pinout, and recommendations), please refer to the official LT3755 datasheet.
- Dual, constant-current LED driver controller designed to work with external MOSFETs
- Wide input voltage range suitable for automotive/high-voltage applications
- Independent current regulation per channel via sense resistor
- Fixed-frequency, current-mode switching for stable regulation and fast transient response
- Dimming options: PWM dimming input and DC/analog dimming capability
- Protection and reliability: overcurrent/short-circuit protection, overvoltage protection, undervoltage lockout, and thermal protection
- Soft-start to reduce inrush and prevent LED flicker
- Auto-retry on fault conditions; robust fault handling
- External components determine LED current and topology flexibility
- Packaging: EUD with TRPBF tape-and-reel
Note: For exact electrical specs (input range, current limits, efficiency, dimming ratios, pinout, and recommendations), please refer to the official LT3755 datasheet.
Pinout
- Pin count: 16 pins (EUD package variant in LT3755EUD-2#TRPBF).
- Function: Dual synchronous buck-boost controller. It drives two external switching nodes (LX1, LX2) via MOSFETs, uses two feedback pins (FB1, FB2) to regulate two outputs, and includes VIN and GND power pins, enable/UVLO, soft-start, current-sense inputs, and a power-good/related control.
- Function: Dual synchronous buck-boost controller. It drives two external switching nodes (LX1, LX2) via MOSFETs, uses two feedback pins (FB1, FB2) to regulate two outputs, and includes VIN and GND power pins, enable/UVLO, soft-start, current-sense inputs, and a power-good/related control.
Manufacturer
Manufacturer: Analog Devices, Inc. (ADI). It is a multinational semiconductor company that designs and manufactures analog, mixed‑signal, and DSP integrated circuits, including power-management ICs. The LT prefix denotes Linear Technology, which is now part of Analog Devices.
Application
LT3755EUD-2#TRPBF is a high‑voltage buck/boost DC‑DC controller. Typical application areas include:
- Automotive power rails (wide input, surge tolerant)
- LED lighting and backlight drivers (constant current)
- Solar/battery charging and power management
- Industrial and telecom power supplies with wide input range
- Portable/rugged DC‑DC converters and ancillary power systems
These use cases leverage its wide input range, high efficiency, and buck/boost capability.
- Automotive power rails (wide input, surge tolerant)
- LED lighting and backlight drivers (constant current)
- Solar/battery charging and power management
- Industrial and telecom power supplies with wide input range
- Portable/rugged DC‑DC converters and ancillary power systems
These use cases leverage its wide input range, high efficiency, and buck/boost capability.
Package
Package type: 16‑lead QFN (4x4 mm) with exposed pad. Tape & Reel, Pb‑free (TRPBF).
