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Analog Devices Inc. LT3466EFE#TRPBF
- Part No.:
- LT3466EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3466EFE#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,718
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Product details
Overview
LT3466EFE#TRPBF from Analog Devices (formerly Linear Technology) is a dual, independent step-up DC/DC converter IC designed to drive up to 20 white LEDs (10 per channel) with constant current. It integrates Schottky diodes, supports 2.7V–24V input, delivers up to 39.5V output per channel, and operates at programmable frequencies from 200kHz to 2MHz. It is used in main/sub-display backlighting for handheld devices powered by Li-ion or alkaline batteries.
For engineers reviewing the LT3466EFE#TRPBF datasheet, LT3466EFE#TRPBF pinout, LT3466EFE#TRPBF application, or LT3466EFE#TRPBF equivalent, this page provides verified technical context, package mapping, real-world dimming control behavior, open-LED protection threshold, and validated alternative options for dual LED driver selection.
Technical Context
The LT3466EFE#TRPBF implements two fully independent current-mode PWM converters sharing only oscillator, bandgap reference, and start-up bias circuitry. Each channel features dedicated SWx, VOUTx, FBx, and CTRLx pins, enabling asymmetric LED string operation and independent analog dimming via 0–1.6V control voltage scaling.
It uses internal soft-start (600µs per channel), open-circuit overvoltage lockout at 39.5V (typ), and undervoltage lockout below 2.1V (typ). Feedback regulation targets 200mV ±8mV at FB1/FB2, with offset between channels ≤7.5mV, ensuring matched LED current accuracy across temperature (–40°C to 85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 24V - supports single Li-ion (3.0–4.2V), dual AA (1.8–3.0V with auxiliary 3.3V supply), or industrial 12–24V rails. |
| Output Voltage Limit | 39.5V (typ) per channel - clamps open-circuit condition to protect LEDs and downstream components. |
| Feedback Reference | 200mV ±8mV - sets LED current as ILED ≈ 200mV / RFB; low value minimizes power loss in current-sense resistor. |
| Switching Frequency | 200kHz to 2MHz - set by external RT resistor; 1MHz typical with 48.7kΩ yields 96% max duty cycle. |
| Efficiency | 81% at 3.6V input driving 16 LEDs (8 per channel) at 15mA - measured with 47µH inductors and ceramic capacitors. |
| Operating Temperature | –40°C to +85°C - specified performance range; junction limit 125°C with θJA = 38°C/W (TSSOP). |
| Quiescent Current | 25µA (typ) in shutdown (CTRL1 = CTRL2 = 0V) - enables ultra-low-power standby in portable systems. |
Pinout & Package
LT3466EFE#TRPBF is packaged in a 16-pin thermally enhanced TSSOP with exposed pad (Pin 17) tied to GND. The exposed pad must be soldered to PCB ground for thermal and electrical integrity. Pin count, layout, and thermal metrics (θJA = 38°C/W, θJC(PAD) = 10°C/W) are confirmed for this variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Ground reference | Internally fused to exposed pad; all must connect to system ground plane for noise immunity and thermal conduction. |
| VOUT1 (Pin 3) | Converter 1 output | Cathode of internal Schottky diode; connects to LED string anode via output capacitor; max 39.5V clamp. |
| SW1 (Pin 4) | Converter 1 switch node | Drives external inductor; high dv/dt node requiring minimized trace length and area to reduce EMI. |
| VIN (Pin 5) | Power input | Supplies both converters; requires local 1µF X5R/X7R ceramic bypass capacitor near pin. |
| SW2 (Pin 6) | Converter 2 switch node | Independent of SW1; same layout rules apply - keep short, avoid routing near FB/CTRL pins. |
| VOUT2 (Pin 7) | Converter 2 output | Identical function to VOUT1; enables true dual-string independence without shared components. |
| FB2 (Pin 10) | Converter 2 feedback | Senses cathode voltage of lowest LED in string 2; 200mV target enables precise current programming. |
| CTRL2 (Pin 11) | Converter 2 dim/shutdown | Analog dimming input: 0–1.6V scales LED current linearly; ≤50mV shuts down channel. |
| RT (Pin 12) | Oscillator timing | Connects to ground via resistor (e.g., 63.4kΩ for 800kHz); 0.54V nominal bias enables frequency programming. |
| CTRL1 (Pin 14) | Converter 1 dim/shutdown | Functionally identical to CTRL2; allows independent brightness control of main and sub displays. |
| FB1 (Pin 15) | Converter 1 feedback | Same 200mV reference as FB2; offset ≤7.5mV ensures <±4% current mismatch between channels. |
| Exposed Pad (Pin 17) | Thermal & electrical ground | Must be soldered to PCB ground plane; primary path for heat dissipation and low-impedance return. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent boost converters | Enables asymmetric LED strings (e.g., 8+4 LEDs) and separate dimming control for main/sub displays without cross-talk. |
| Integrated Schottky diodes | Eliminates 2 external diodes per channel; reduces BOM count, board area, and forward drop losses (0.85V @ 300mA). |
| Open-LED protection | Clamps VOUT1/VOUT2 at 39.5V (typ) during open-circuit fault - prevents overvoltage damage to LEDs and PCB traces. |
| Internal soft-start | 600µs per channel limits inrush current during startup; avoids input rail sag and stress on input capacitor. |
| Low 200mV feedback voltage | Reduces power loss in RFB; e.g., 10Ω resistor dissipates only 4mW at 20mA LED current vs. 200mW at 1V reference. |
Applications
| Main/Sub Display Backlighting | Digital Camera LCD Backlight |
|---|---|
|
Use Scenario: Driving separate LED strings for primary display (e.g., 8 LEDs) and secondary status display (e.g., 4 LEDs) in smartphones or PDAs. IC Role / Device Role / Timing Role: Dual-channel constant-current boost controller providing independent voltage boosting and analog dimming per string. Use Value: Eliminates need for ballast resistors and factory calibration; ensures uniform brightness across both displays using matched 200mV feedback references. |
Use Scenario: Powering small-format LCD backlights in compact digital cameras where space and battery life are critical. IC Role / Device Role / Timing Role: High-efficiency (81% @ 16 LEDs) step-up converter operating from 3.6V Li-ion supply with minimal external components. Use Value: Integrated Schottky diodes and 200kHz–2MHz frequency tuning allow use of tiny 15µH inductors and 0.47µF ceramics, reducing solution size by >30% vs discrete alternatives. |
| Automotive Infotainment Displays | Handheld Industrial Terminals |
|
Use Scenario: Backlighting multi-zone LCDs in automotive head units requiring wide input range (9–16V) and robust fault protection. IC Role / Device Role / Timing Role: Dual boost regulator with 24V absolute max input rating and 39.5V open-circuit clamp for system-level safety compliance. Use Value: Operates across full automotive cold-crank (6.5V) to load-dump (24V) conditions; thermal enhancement (θJA = 38°C/W) sustains 85°C ambient operation. |
Use Scenario: Illuminating ruggedized LCDs in warehouse scanners or field meters powered by alkaline or NiMH batteries. IC Role / Device Role / Timing Role: Low-input-voltage capable converter (2.7V min) supporting dual AA/AAA cells with auxiliary 3.3V logic supply. Use Value: Undervoltage lockout at 2.1V prevents erratic operation during battery depletion; shutdown quiescent current <25µA extends battery runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3220EUD#TRPBF | Charge-pump architecture (no inductors); fixed 2x/3x gain; max 36V output; no integrated diodes. | Better for ultra-thin designs where inductor height is constrained; lower efficiency (~75%) above 10 LEDs. | Choose LTC3220 when board height is limited and LED count ≤12; avoid when >10 LEDs per string or high efficiency is required. |
| TPS68400RGTT | Single-channel, higher integration (I²C interface, fault reporting); 36V max output; no internal Schottky diodes. | Requires external diodes and two ICs for dual-string operation; adds software overhead but enables diagnostics. | Choose TPS68400 for systems needing telemetry and programmable protection; use LT3466EFE#TRPBF for simpler, lower-cost dual-analog-control solutions. |
Compared with LTC3220EUD#TRPBF and TPS68400RGTT, the LT3466EFE#TRPBF delivers higher efficiency for >12-LED strings, eliminates external diodes, and provides true hardware-based dual-channel independence without firmware dependency - making it optimal for cost-sensitive, high-brightness portable displays.
Availability
LT3466EFE#TRPBF is available at Aetrix Electronics and suitable for main/sub-display backlighting, digital camera LCDs, automotive infotainment systems, and handheld industrial terminals requiring stable component supply and long-term manufacturability.
Supply support for LT3466EFE#TRPBF 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 acquired Linear Technology in 2017 and maintains full product support, datasheets, and application engineering for legacy Linear parts including the LT3466 series.
The LT3466 belongs to Linear's high-performance LED driver product line, engineered specifically for portable display backlighting with emphasis on efficiency, small solution size, and dual-channel flexibility in space-constrained devices.
FAQ
What is the maximum number of white LEDs the LT3466EFE#TRPBF can drive?
The LT3466EFE#TRPBF can drive up to 20 white LEDs - 10 in series per channel. This is limited by the 39.5V open-circuit clamp voltage and typical forward voltage of ~3.2V per white LED at 15–20mA, allowing ~12 LEDs theoretically but derated to 10 for margin across temperature and unit variation. Each channel operates independently, so asymmetric configurations (e.g., 8+6) are fully supported.
Does the LT3466EFE#TRPBF require external Schottky diodes?
No, the LT3466EFE#TRPBF integrates two Schottky diodes - one per boost channel - with 0.85V forward drop at 300mA and 5µA reverse leakage at 20V. This eliminates the need for external diodes, reduces bill-of-materials count, saves PCB area, and improves reliability by removing solder joints and component placement variables associated with discrete diodes.
How is LED current programmed on the LT3466EFE#TRPBF?
LED current is programmed per channel using a single external resistor (RFB1 or RFB2) connected between the FBx pin and the cathode of the lowest LED in the string. With CTRLx ≥ 1.6V, ILEDx ≈ 200mV / RFBx. For analog dimming below full scale, ILEDx ≈ (VCTRLx/5) × RFBx when VCTRLx < 1V. Precision 1% resistors are recommended for tight current matching.
What happens if one LED string opens while the other remains connected on the LT3466EFE#TRPBF?
If one LED string opens, its corresponding converter (e.g., Channel 1) clamps VOUT1 at 39.5V (typ) and continues switching at reduced peak current to regulate at that voltage. The other channel (e.g., Channel 2) operates normally - no disruption, no shutdown, no cross-channel interference. This fault-isolation behavior is inherent to the dual-independent architecture of the LT3466EFE#TRPBF.
Can the LT3466EFE#TRPBF operate from a 2.7V input supply?
Yes, the LT3466EFE#TRPBF is fully specified to operate from 2.7V to 24V input. At 2.7V, it can still drive up to 6–8 white LEDs per string depending on forward voltage and desired current. For very low input (e.g., 2 AA cells at 1.8V), the recommended configuration powers the IC from a 3.3V logic rail while connecting the inductors directly to the battery - a technique explicitly validated in the LT3466EFE#TRPBF datasheet.
LT3466EFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 2
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 24V
- Voltage - Output:
- 39.5V
- Current - Output / Channel:
- 400mA
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3466EFE#TRPBF FAQ
1.How can I place an order for LT3466EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3466EFE#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT3466EFE#TRPBF reliable?
The price and inventory of LT3466EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3466EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3466EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3466EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3466EFE#TRPBF?
LT3466EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3466EFE#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT3466EFE#TRPBF?
For technical support, including LT3466EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3466EFE#TRPBF requirements.
6.How does Aetrix verify that LT3466EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3466EFE#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT3466EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3466EFE#TRPBF?
All LT3466EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3466EFE#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT3466EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3466EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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