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Analog Devices Inc. LT3466EFE
- Part No.:
- LT3466EFE
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3466EFE.pdf
- Description:
- IC LED DRVR RGLTR DIM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,236
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Product details
Overview
LT3466EFE 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, featuring integrated Schottky diodes, 200mV feedback reference, and 39.5V open-LED protection. It operates from 2.7V–24V input and delivers 81% efficiency driving 16 LEDs at 15mA from 3.6V - ideal for main/sub-display backlighting in handheld devices.
For engineers reviewing the LT3466EFE datasheet, LT3466EFE pinout, LT3466EFE application, or LT3466EFE equivalent, this page provides verified technical context, package-specific pin mapping (16-pin TSSOP), real-world dimming control behavior, thermal performance data (θJA = 38°C/W), and validated alternative options for LED driver selection.
Technical Context
The LT3466EFE implements two fully independent current-mode PWM converters sharing only oscillator, bandgap reference, and start-up bias circuitry. Each channel uses a 200mV feedback threshold and supports programmable switching frequency (200kHz–2MHz) via external RT resistor, with peak switch current limit of 400mA and VCESAT ≤360mV at 300mA.
It features separate CTRL1/CTRL2 pins enabling analog dimming (0–1.6V linear control) and independent shutdown, plus built-in soft-start (600µs), undervoltage lockout (2.1V), and open-circuit overvoltage clamping at 39.5V per output - all while maintaining asymmetrical LED string operation without cross-regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 24V - supports single Li-ion (3.6V), dual alkaline (1.8–3V), or industrial 24V rails without external regulators. |
| Feedback Reference Voltage | 200mV ±8mV - enables precise LED current setting with low-power loss in RFB resistors (e.g., 10Ω for 20mA). |
| Max Output Voltage (OVP) | 39.5V - clamps each output independently during open-LED fault, protecting downstream components. |
| Switch Current Limit | 400mA typical per channel - ensures safe operation with 47µH inductors driving 8–10 LEDs in series at 15–20mA. |
| Switch Saturation Voltage | ≤360mV at 300mA - minimizes conduction loss and improves efficiency in high-current LED strings. |
| Quiescent Current (Active) | 7.5mA typical - balances low-noise regulation with power-sensitive portable applications. |
| Thermal Resistance (θJA) | 38°C/W - measured in 16-pin TSSOP with exposed pad soldered to PCB ground plane. |
Pinout & Package
LT3466EFE is housed in a 16-lead plastic TSSOP package (JEDEC MO-153) with thermally enhanced exposed pad (Pin 17, GND). The package measures 5mm × 4.4mm × 1.2mm and requires soldering of the exposed pad to PCB ground for optimal thermal performance and EMI reduction.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8, 9, 16 | GND | Internally fused to exposed pad; must connect to system ground plane for thermal dissipation and noise immunity. |
| 2 | NC | No internal connection; leave unconnected or tie to GND per layout best practice. |
| 3 | VOUT1 | Output of Converter 1; connects to cathode of internal Schottky diode and LED string anode via output capacitor. |
| 4 | SW1 | Switch node for Converter 1; connects directly to inductor; high dV/dt node requiring short, low-inductance trace. |
| 5 | VIN | Main input supply (2.7–24V); requires local 1µF X5R/X7R ceramic bypass capacitor near pin. |
| 6 | SW2 | Switch node for Converter 2; electrically isolated from SW1; same layout constraints apply. |
| 7 | VOUT2 | Output of Converter 2; identical function to VOUT1 but independent regulation and OVP. |
| 10 | FB1 | Feedback input for Converter 1; senses voltage across RFB1 to regulate LED current to ILED1 ≈ 200mV/RFB1. |
| 11 | CTRL1 | Analog dimming/shutdown control for Converter 1; 0–1.6V sets LED current linearly; <50mV disables channel. |
| 12 | RT | Timing resistor connection; sets oscillator frequency from 200kHz–2MHz (e.g., 63.4kΩ = 800kHz). |
| 13 | CTRL2 | Analog dimming/shutdown control for Converter 2; functionally identical to CTRL1, fully independent. |
| 14 | FB2 | Feedback input for Converter 2; regulates ILED2 ≈ 200mV/RFB2; must be routed away from SW1/SW2 nodes. |
| 15 | GND | Additional ground pin; ties to exposed pad and other GND pins for low-impedance return path. |
| 17 | Exposed Pad | Thermal and electrical GND; mandatory solder connection to PCB ground plane for θJA = 38°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent boost converters | Enables asymmetric LED string configurations (e.g., 8 + 10 LEDs) without mutual interference or shared current sensing. |
| Integrated Schottky diodes | Eliminates 2 external diodes per channel, reducing BOM count, board area, and forward drop losses (0.85V @ 300mA). |
| 200mV precision feedback reference | Minimizes power loss in current-setting resistors and improves accuracy vs. higher-voltage references (e.g., 1.25V). |
| Independent analog dimming (CTRL1/CTRL2) | Supports 0–100% linear LED brightness control per channel using simple DC voltage or filtered PWM signal. |
| Open-LED protection (39.5V clamp) | Prevents destructive overvoltage on disconnected LED strings while allowing the other channel to remain operational. |
| Internal soft-start (600µs) | Controls inrush current during startup, eliminating need for external soft-start circuitry or large input capacitors. |
Applications
| Main/Sub Display Backlighting | Digital Camera LCD Backlight |
|---|---|
|
Use Scenario: Powering dual-panel displays in smartphones or PDAs where primary and secondary screens require independent brightness control. IC Role / Device Role / Timing Role: Dual-channel constant-current LED driver delivering regulated 15–20mA per string with independent CTRL1/CTRL2 analog dimming. Use Value: Enables simultaneous, asymmetric backlighting (e.g., 8 LEDs on main screen, 10 on sub-screen) without cross-talk or additional ICs. |
Use Scenario: Driving compact LCD backlights in digital cameras with tight space constraints and battery life requirements. IC Role / Device Role / Timing Role: High-efficiency step-up converter supplying stable current to 4–6 white LEDs from a single Li-ion cell (3.6V). Use Value: Achieves 81% efficiency at 15mA/8-LED load, extending battery runtime while maintaining uniform brightness via series LED configuration. |
| Handheld Computer Keypad Illumination | Automotive Infotainment Display |
|
Use Scenario: Providing adjustable keypad backlighting in rugged handheld computers operating across wide temperature ranges. IC Role / Device Role / Timing Role: Constant-current LED driver with –40°C to 85°C guaranteed operation, UVLO (2.1V), and robust open-circuit protection. Use Value: Ensures reliable keypad illumination under cold-start conditions and prevents damage from failed LEDs in field-deployed units. |
Use Scenario: Backlighting automotive-grade TFT displays powered from 12V or 24V vehicle batteries. IC Role / Device Role / Timing Role: Wide-input (2.7–24V) dual boost controller supporting up to 20 LEDs with thermal management via exposed-pad TSSOP package. Use Value: Eliminates need for pre-regulator stages when deriving LED power directly from automotive rail, simplifying power architecture. |
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 |
|---|---|---|---|
| MAX16832AETG+ | Single-channel, 60V max output, no integrated Schottky; requires external diode and sense resistor. | Lacks dual independent control; suited for single-string designs only. | Select when cost sensitivity outweighs integration benefits and dual-channel operation is unnecessary. |
| TPS61165DRVR | Single-channel, 36V OVP, 1.25V feedback reference, no RT-programmable frequency. | Requires external dimming transistor; no independent shutdown per channel. | Choose for simpler single-string systems where analog dimming range and thermal performance are less critical. |
Compared with LT3466EFE, MAX16832AETG+ and TPS61165DRVR offer lower integration and reduced channel independence - making LT3466EFE uniquely suitable for asymmetric dual-display backlighting requiring minimal BOM, precise 200mV current regulation, and per-channel fault tolerance.
Availability
LT3466EFE is available at Aetrix Electronics and suitable for main/sub-display backlighting, digital camera LCDs, handheld computer keypads, and automotive infotainment displays requiring stable component supply and long-term manufacturability.
Supply support for LT3466EFE 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 family.
The LT3466 product line was engineered specifically for portable device backlighting, emphasizing dual-channel independence, integrated power components, and robust fault protection in compact TSSOP and DFN packages.
FAQ
What is the maximum number of white LEDs the LT3466EFE can drive?
The LT3466EFE can drive up to 20 white LEDs - 10 in series per channel - limited by its 39.5V open-circuit clamp voltage and 400mA per-switch current limit. At 3.6V input, it reliably powers 8 LEDs per string at 15mA with 81% efficiency, as verified in the LT3466EFE datasheet Figure 1 and TA05b efficiency plot.
Does the LT3466EFE require external Schottky diodes?
No, the LT3466EFE 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 board area, and improves efficiency compared to discrete solutions requiring external 40V+ Schottky components.
How is LED current programmed on the LT3466EFE?
LED current is set independently per channel using precision feedback resistors: ILED1 ≈ 200mV/RFB1 and ILED2 ≈ 200mV/RFB2. For example, a 10Ω resistor yields 20mA. The LT3466EFE's 200mV reference minimizes power loss and enables accurate current regulation across temperature, as confirmed in Electrical Characteristics Table (FB1/FB2 = 192–208mV).
What is the purpose of the RT pin on the LT3466EFE?
The RT pin programs the LT3466EFE's switching frequency from 200kHz to 2MHz using a single external resistor to ground. A 63.4kΩ resistor sets 800kHz operation (used in Figure 1), balancing inductor size and efficiency. The nominal RT pin voltage is 0.54V, and oscillator frequency variation vs. temperature is characterized in Figure 3466 G12.
Can the LT3466EFE operate from a 2-cell alkaline battery?
Yes - the LT3466EFE operates down to 2.7V input and supports low-voltage configurations like powering inductors directly from two AA cells (1.8–3V) while running the IC from a separate 3.3V logic rail, as shown in Figure 9 of the LT3466EFE datasheet. This extends runtime in battery-powered handheld devices without compromising LED brightness.
LT3466EFE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Yes
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3466EFE FAQ
1.How can I place an order for LT3466EFE through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3466EFE 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 reliable?
The price and inventory of LT3466EFE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3466EFE is usually 5 days.
3.What payment methods are accepted for LT3466EFE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3466EFE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3466EFE?
LT3466EFE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3466EFE 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?
For technical support, including LT3466EFE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3466EFE requirements.
6.How does Aetrix verify that LT3466EFE is sourced from the original manufacturer or authorized distributors?
All LT3466EFE 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 meets industry standards.
7.What is the process for return or replacement of LT3466EFE?
All LT3466EFE units undergo pre-shipment inspection (PSI). If there is an issue with LT3466EFE, 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 part is unused and in its original packaging.
Return procedure for LT3466EFE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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