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Analog Devices Inc. LT3466EDD#TRPBF
- Part No.:
- LT3466EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3466EDD#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 400MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,879
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Product details
Overview
LT3466EDD#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, featuring integrated Schottky diodes, 200 mV feedback reference, 2.7–24 V input range, and open-LED protection clamping at 39.5 V - used in main/sub-display backlighting for handheld devices.
For engineers reviewing the LT3466EDD#TRPBF datasheet, LT3466EDD#TRPBF pinout, LT3466EDD#TRPBF application, or LT3466EDD#TRPBF equivalent, key selection criteria include dual-channel independent dimming control, fixed-frequency programmability (200 kHz–2 MHz), internal soft-start, thermal-enhanced 10-pin DFN package, and asymmetric LED string capability.
Technical Context
The LT3466EDD#TRPBF implements two fully independent current-mode PWM converters sharing only oscillator, bandgap reference, and start-up bias circuitry. Each channel uses a 200 mV precision feedback threshold and supports separate CTRL pin analog dimming (0–1.6 V linear range) and shutdown control.
It features internal Schottky diodes (0.85 V forward drop @ 300 mA), 96% max duty cycle at 1 MHz, 320–400 mA per-switch current limit, and open-circuit output clamping at 39.5 V. The RT pin sets switching frequency via external resistor, with nominal RT voltage of 0.54 V and oscillator current sourcing capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 24 V - supports single Li-ion (3.6 V), dual alkaline (1.8–3 V), or industrial 24 V rails without external regulators. |
| Feedback Reference Voltage | 200 mV (±4 mV over temp) - enables low-loss current-setting resistors and high-current accuracy with 1% RFB. |
| Max Output Voltage Clamp | 39.5 V - protects against LED open-circuit failure while allowing up to 10-series white LEDs per channel (~3.9 V each). |
| Switch Current Limit | 320–400 mA per channel - ensures safe operation with 15–20 mA LED strings across 8–10 LEDs, limiting peak inductor stress. |
| Switching Frequency Range | 200 kHz to 2 MHz - adjustable via RT resistor; higher frequencies reduce inductor size but trade off efficiency (e.g., 81% @ 1 MHz, 8/8 LEDs, 3.6 V). |
| Quiescent Current | 16–25 µA in shutdown (CTRL1 = CTRL2 = 0 V) - minimizes battery drain in portable standby modes. |
| Soft-Start Time | 600 µs per channel - prevents inrush current surges during power-up, critical for capacitor-charged LED strings. |
Pinout & Package
LT3466EDD#TRPBF is housed in a thermally enhanced 10-pin (3 mm × 3 mm × 0.75 mm) plastic DFN package with exposed pad (Pin 11) soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT1 (Pin 1) | Converter 1 output cathode node | Connects to cathode of top LED in string 1; ties to internal Schottky anode - requires local ceramic output capacitor to GND. |
| SW1 (Pin 2) | Converter 1 power switch drain | Connects to inductor L1; carries high di/dt switching current - must minimize trace length to reduce EMI and voltage spikes. |
| VIN (Pin 3) | Main input supply rail | Accepts 2.7–24 V; requires local 1 µF X5R/X7R ceramic bypass capacitor near pin to suppress input ripple and noise. |
| SW2 (Pin 4) | Converter 2 power switch drain | Independent high-side switch node for second LED string; layout rules identical to SW1 for EMI control. |
| VOUT2 (Pin 5) | Converter 2 output cathode node | Same function as VOUT1 but for second string; enables asymmetric configurations (e.g., 8 vs. 6 LEDs). |
| FB2 (Pin 6) | Converter 2 current-sense feedback | Senses voltage across RFB2; regulates LED current via ILED2 ≈ 200 mV / RFB2 when CTRL2 > 1.6 V. |
| CTRL2 (Pin 7) | Converter 2 dimming/shutdown control | Analog dimming input: 0–1.6 V linearly scales LED current; ≤50 mV disables converter; ≥1.6 V enables full current. |
| RT (Pin 8) | Oscillator timing resistor connection | Resistor to GND sets frequency: 48.7 kΩ → 1 MHz; 63.4 kΩ → 800 kHz; 20.5 kΩ → 2 MHz - internal 0.54 V bias. |
| CTRL1 (Pin 9) | Converter 1 dimming/shutdown control | Functionally identical to CTRL2; enables independent brightness control of first LED string. |
| FB1 (Pin 10) | Converter 1 current-sense feedback | Regulates ILED1 ≈ 200 mV / RFB1; high-impedance input (≤50 nA bias) minimizes resistor-divider error. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent boost converters | Enables simultaneous but asymmetric backlighting (e.g., 8-LED main display + 6-LED sub-display) without cross-talk or shared regulation errors. |
| Integrated Schottky diodes | Eliminates two external 0.85 V-drop diodes per channel, reducing BOM count, board area, and thermal overhead in space-constrained handhelds. |
| 200 mV precision feedback reference | Reduces power loss in current-setting resistors by 5× vs. typical 1 V references - improves efficiency especially at high LED currents (e.g., 20 mA). |
| Open-LED protection with 39.5 V clamp | Prevents destructive overvoltage on disconnected or failed LED strings while allowing remaining channel to operate normally. |
| Per-channel soft-start (600 µs) | Controls inrush into output capacitors independently - avoids system-wide voltage droop during sequential or staggered startup. |
| Programmable 200 kHz–2 MHz switching | Allows optimization between compact magnetics (2 MHz) and peak efficiency (800 kHz), validated across 15–68 µH inductors in production designs. |
Applications
| Main/Sub Display Backlighting | Digital Camera LCD Backlight |
|---|---|
|
Use Scenario: Dual-panel mobile phone with primary high-resolution TFT and secondary status OLED display requiring independent brightness control. IC Role / Device Role / Timing Role: LT3466EDD#TRPBF acts as dual constant-current LED driver, regulating two independent boost channels to maintain uniform luminance across mismatched LED counts and forward voltages. Use Value: Enables precise 0–100% analog dimming per panel using separate CTRL1/CTRL2 pins, eliminating need for external PWM generators or microcontroller GPIO expansion. |
Use Scenario: Compact digital camera with rear 3-inch LCD requiring stable backlight under varying battery voltage (3.0–4.2 V Li-ion). IC Role / Device Role / Timing Role: LT3466EDD#TRPBF serves as single-channel LED driver (one converter active), delivering regulated 20 mA to 8-series white LEDs with <±2% current accuracy. Use Value: Internal 39.5 V open-circuit clamp prevents damage if LCD flex cable disconnects during field use - critical for consumer device reliability. |
| Handheld Computer Keypad Illumination | Automotive Infotainment Sub-Display |
|
Use Scenario: Ruggedized PDA with membrane keypad needing low-power, always-on indicator lighting powered from 3.3 V logic rail. IC Role / Device Role / Timing Role: LT3466EDD#TRPBF operates in low-duty-cycle mode driving 2–4 LEDs at 2.5 mA, leveraging 200 mV FB reference for minimal resistor power loss. Use Value: Shutdown quiescent current of 16–25 µA extends battery life in standby; CTRL pin dimming allows adaptive brightness based on ambient light sensor output. |
Use Scenario: Automotive center-stack display with secondary climate control panel requiring AEC-Q200–compatible LED drive under 12 V battery transients. IC Role / Device Role / Timing Role: LT3466EDD#TRPBF powers 6-white-LED string from 9–16 V input range, using RT resistor to fix switching at 600 kHz for optimal EMI filtering in noisy vehicle environments. Use Value: Wide 2.7–24 V input range accommodates cold-crank (6.5 V) and load-dump (36 V clamped) conditions without external pre-regulator - reduces system cost and complexity. |
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); 500 mA total output; fixed 2x/3x gain; no RT programming; lower max LED count (12 total) | Better for ultra-thin devices where inductor height is prohibited; unsuitable for >10-series LEDs or >24 V input | Select LTC3220EUD#TRPBF only when board height <1.0 mm is mandatory and LED string voltage <12 V. |
| TPS61165DRVR | Single-channel boost; 40 V OVP; 1.2 MHz fixed freq; no internal Schottky; requires external diode; 30 V max VIN | Requires two ICs for dual strings; higher BOM cost and layout area; lacks independent CTRL dimming per channel | Choose TPS61165DRVR only if dual-channel integration is unnecessary and existing design already uses TI ecosystem tools. |
Compared with LTC3220EUD#TRPBF and TPS61165DRVR, the LT3466EDD#TRPBF uniquely delivers true dual independent boost regulation with integrated diodes, 24 V input support, and per-channel analog dimming - making it optimal for asymmetric, high-voltage, or space-constrained dual-backlight systems.
Availability
LT3466EDD#TRPBF is available at Aetrix Electronics and suitable for main/sub-display backlighting, digital camera LCD illumination, and handheld computer keypad lighting requiring stable component supply, long-term manufacturability, and automotive-grade thermal performance.
Supply support for LT3466EDD#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and consumer markets.
The LT3466EDD#TRPBF belongs to Linear's legacy LED driver product line, engineered specifically for portable display backlighting with emphasis on efficiency, integration, and robust fault protection in battery-powered systems.
FAQ
What is the maximum number of white LEDs the LT3466EDD#TRPBF can drive?
The LT3466EDD#TRPBF can drive up to 20 white LEDs - 10 in series per channel - limited by its 39.5 V output overvoltage clamp and typical white LED forward voltage of ~3.9 V. Driving 10 LEDs at 3.9 V each yields ~39 V, staying within the safe operating margin. Exceeding this risks triggering open-circuit protection.
Does the LT3466EDD#TRPBF require external Schottky diodes?
No, the LT3466EDD#TRPBF integrates two Schottky diodes - one per boost channel - with 0.85 V forward drop at 300 mA. This eliminates the need for external diodes, reducing bill-of-materials count, PCB area, and thermal design complexity in compact handheld applications.
How is LED current set on the LT3466EDD#TRPBF?
LED current is set per channel using a feedback resistor: ILED1 ≈ 200 mV / RFB1 and ILED2 ≈ 200 mV / RFB2, assuming CTRL1/CTRL2 > 1.6 V. For analog dimming below full scale, ILED ≈ (VCTRL / 5) × RFB applies when VCTRL < 1 V - enabling smooth brightness control without PWM flicker.
What package type is used for the LT3466EDD#TRPBF?
The LT3466EDD#TRPBF uses a 10-pin (3 mm × 3 mm × 0.75 mm) plastic DFN package with exposed thermal pad (Pin 11). This package provides superior thermal performance vs. older SOIC variants and is optimized for high-density portable PCB layouts with tight height constraints.
Can the LT3466EDD#TRPBF operate from a 2 AA battery supply?
Yes - the LT3466EDD#TRPBF supports input voltages as low as 2.7 V, making it compatible with two alkaline AA cells (1.8–3.0 V). In such configurations, the IC is typically powered from a 3.3 V logic rail while the inductors connect directly to the battery, improving overall system efficiency and runtime.
LT3466EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN 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:
- 10-DFN (3x3)
LT3466EDD#TRPBF FAQ
1.How can I place an order for LT3466EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3466EDD#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 LT3466EDD#TRPBF reliable?
The price and inventory of LT3466EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3466EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3466EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3466EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3466EDD#TRPBF?
LT3466EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3466EDD#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 LT3466EDD#TRPBF?
For technical support, including LT3466EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3466EDD#TRPBF requirements.
6.How does Aetrix verify that LT3466EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3466EDD#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 LT3466EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3466EDD#TRPBF?
All LT3466EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3466EDD#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 LT3466EDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3466EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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