Analog Devices Inc. LT3466EDD-1#PBF

Overview

LT3466EDD-1#PBF from Analog Devices (formerly Linear Technology) is a dual-output DC/DC switching regulator integrating an independent white LED driver and a boost converter in a single 10-lead 3mm × 3mm DFN package. It delivers ±1.5% output voltage accuracy on the boost channel, ±4% LED current programming accuracy, and supports up to 10-series white LEDs from 2.7V–24V input - used in portable display backlighting and OLED bias generation.

For engineers reviewing the LT3466EDD-1#PBF datasheet, LT3466EDD-1#PBF pinout, LT3466EDD-1#PBF application, or LT3466EDD-1#PBF equivalent, key selection criteria include independent dimming control per channel, internal Schottky diodes, 200kHz–2MHz programmable switching frequency, overvoltage protection clamping at 39.5V, and thermal performance with θJA = 43°C/W.

Technical Context

The LT3466EDD-1#PBF implements two fully independent constant-frequency current-mode PWM converters sharing only oscillator and bandgap reference circuitry. Converter 1 uses a 200mV feedback reference for LED current regulation, while Converter 2 employs an 800mV reference for precise voltage regulation of LCD/OLED bias supplies.

Each channel features dedicated CTRL pins enabling independent shutdown and analog dimming: CTRL1 modulates LED current from 0 to full scale (up to 20mA typical), and CTRL2 adjusts VOUT2 feedback voltage from 0V to 0.8V. Internal soft-start limits inrush current, and overvoltage protection clamps both outputs at 39.5V during open-circuit faults.

Key Specifications

Pinout & Package

LT3466EDD-1#PBF is housed in a 10-lead plastic DFN (DD) package measuring 3mm × 3mm × 0.75mm, with exposed thermal pad (Pin 11) requiring solder connection to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output LED driver and boost converter applications.

Compared with LTC3466EDD-1#PBF and MAX16832ATL+T, the LT3466EDD-1#PBF uniquely integrates both LED driving and boost conversion in one package, eliminating external diodes and reducing total solution size by >40% - critical for ultra-thin portable displays.

Availability

LT3466EDD-1#PBF is available at Aetrix Electronics and suitable for portable display backlighting, OLED bias generation, and TFT-LCD gate driver supply requiring stable component supply across automotive, industrial, and consumer electronics programs.

Supply support for LT3466EDD-1#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.

The LT3466EDD-1#PBF belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for compact, high-efficiency display power solutions in battery-powered portable electronics.

FAQ

What is the maximum number of white LEDs the LT3466EDD-1#PBF can drive?

The LT3466EDD-1#PBF can drive up to 10 white LEDs in series from a 3.6V supply, leveraging its high output voltage capability (up to 39.5V clamp) and 400mA switch current limit. At 3.6V input, practical configurations typically support 6–8 LEDs depending on forward voltage distribution and desired current (e.g., 20mA). The device maintains ±4% LED current accuracy across the full string, ensuring uniform brightness without ballast resistors.

Does the LT3466EDD-1#PBF require external Schottky diodes?

No, the LT3466EDD-1#PBF integrates two internal Schottky diodes - one for each converter channel - eliminating the need for external diodes. This reduces bill-of-materials count, PCB area, and forward voltage loss (typical 0.85V drop at 300mA), directly improving system efficiency by approximately 3% compared to discrete implementations. The internal diodes are rated for 1A peak inrush current, supporting robust startup behavior.

How is dimming controlled on the LT3466EDD-1#PBF?

The LT3466EDD-1#PBF supports independent analog dimming via two dedicated control pins: CTRL1 (0–1.8V) adjusts LED current linearly on Channel 1, while CTRL2 (0–1V) modulates the FB2 reference voltage on Channel 2. Both pins accept filtered PWM signals or DC voltage sources - enabling flicker-free brightness control without adding external DACs or PWM generators. Dimming thresholds are precisely defined: 150mV turns on each channel, and <70mV shuts it down.

What protection features does the LT3466EDD-1#PBF include?

The LT3466EDD-1#PBF integrates multiple hardware-level protections: output overvoltage clamping at 39.5V per channel, internal soft-start (600µs) limiting inrush current, undervoltage lockout below 2.1V, and thermal shutdown at 125°C junction temperature. Each converter also features independent current limiting (400mA typ), switch saturation monitoring, and high-impedance feedback inputs (10nA bias) to minimize loading errors - collectively ensuring robust operation in unattended portable systems.

Can the LT3466EDD-1#PBF operate from a 24V input supply?

Yes, the LT3466EDD-1#PBF supports an absolute maximum input voltage of 24V and operates continuously across the full 2.7V–24V range. Its internal power switches, gate drivers, and feedback circuitry are rated for this extended range, making it suitable for 12V/24V industrial and automotive auxiliary power rails. When operating at 24V, the device maintains regulation on both channels, though efficiency decreases slightly due to higher switching and conduction losses - verified in Typical Performance Characteristics graphs up to VIN = 24V.