My Inquiry
My Account
Analog Devices Inc. LT3466EFE#PBF
- Part No.:
- LT3466EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3466EFE#PBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:708
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3466EFE#PBF from Analog Devices (formerly Linear Technology) is a dual, independent step-up DC/DC converter IC designed to drive two asymmetric white LED strings 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#PBF datasheet, LT3466EFE#PBF pinout, LT3466EFE#PBF application, or LT3466EFE#PBF equivalent, this page provides verified technical context, package-specific pin functions, real-world efficiency data at 8/8 LED loads, open-circuit protection behavior, and validated alternatives for dual-LED driver replacement.
Technical Context
The LT3466EFE#PBF implements two fully independent current-mode PWM converters sharing only the bandgap reference, oscillator bias, and RT timing control. Each channel features dedicated FB and CTRL pins, internal 0.2V feedback reference, and separate soft-start circuitry-enabling asymmetric dimming, independent shutdown, and open-circuit clamping at 39.5V without cross-talk.
It uses fixed-frequency, peak-current-mode control with slope compensation. Switch saturation voltage is 360mV at 300mA, and internal Schottky diodes exhibit 0.85V forward drop at 300mA. The 16-pin thermally enhanced TSSOP package includes an exposed pad (Pin 17) tied to GND for thermal management (θJC = 10°C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 24V - supports single-cell Li-ion (3.6V), dual-AA (1.8–3V), and industrial 12–24V rails without external regulators. |
| Output Voltage Limit | 39.5V max per channel - enables driving up to 10 white LEDs (VF ≈ 3.95V each) in series per converter. |
| Feedback Reference | 200mV ±8mV - low-voltage reference minimizes I²R loss in current-setting resistors, improving efficiency at high LED currents. |
| Switching Frequency | 200kHz to 2MHz (RT-programmable) - tradeoff between inductor size (e.g., 15µH at 1.25MHz) and efficiency (81% at 8/8 LEDs, 3.6V in). |
| LED Current Accuracy | ±5% typical over temp - achieved via matched FB1/FB2 references and <7.5mV offset between channels, ensuring uniform brightness across displays. |
| Quiescent Current | 25µA (shutdown mode, CTRL1=CTRL2=0V) - critical for battery life in always-on sub-displays or standby backlight states. |
| Thermal Resistance | θJA = 38°C/W, θJC(PAD) = 10°C/W - requires exposed pad soldering to PCB ground plane for reliable operation at full load in compact handheld layouts. |
Pinout & Package
LT3466EFE#PBF is housed in a 16-lead plastic TSSOP package (FE) with exposed thermal pad (Pin 17). All GND pins (1, 8, 9, 16) and the exposed pad must be soldered to system ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Ground reference and power return | Internally fused to exposed pad; must connect to low-impedance PCB ground plane to minimize noise and ensure thermal dissipation. |
| VIN (Pin 5) | Main input supply | Accepts 2.7–24V; requires local 1µF X5R/X7R ceramic bypass capacitor placed adjacent to pin to suppress switching noise. |
| SW1 / SW2 (Pins 4, 6) | Power switch outputs | High-frequency switching nodes; trace length must be minimized to reduce EMI and ringing-critical for stable 2MHz operation. |
| VOUT1 / VOUT2 (Pins 3, 7) | Boost output terminals | Connected to cathodes of internal Schottky diodes; each drives one LED string; output capacitors must be placed close to these pins. |
| FB1 / FB2 (Pins 15, 10) | Current-sense feedback inputs | Monitor LED current via resistor to ground; sensitive to noise-must be routed away from SW pins and grounded locally at resistor. |
| CTRL1 / CTRL2 (Pins 14, 11) | Dimming/shutdown control | Analog dimming interface: 0–1.6V linearly scales LED current; <50mV shuts down channel; >1.6V saturates at full current. |
| RT (Pin 12) | Oscillator timing input | Resistor-to-ground sets frequency; nominal 0.54V bias; value determines max duty cycle (92–99%) and inductor sizing tradeoffs. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent boost converters | Enables simultaneous but non-identical backlighting for main and sub-displays (e.g., smartphone + secondary status panel) without shared regulation errors. |
| Integrated Schottky diodes | Eliminates 2 external diodes per channel, reduces BOM count and board area, and avoids reverse leakage issues common with discrete diodes. |
| Open-LED protection | Clamps VOUT1/VOUT2 at 39.5V when LEDs disconnect-prevents overvoltage damage to downstream components and maintains safe operation of the remaining channel. |
| Internal soft-start (600µs) | Prevents inrush current spikes during power-up, protecting input capacitors and battery sources-especially critical in portable Li-ion systems. |
| Asymmetric dimming control | Independent CTRL1/CTRL2 pins allow different brightness levels per display (e.g., main screen at 100%, sub-display at 30%) using simple analog voltage or filtered PWM. |
Applications
| Main/Sub Display Backlighting | Digital Camera LCD Backlight |
|---|---|
|
Use Scenario: Dual-panel smartphones or PDAs requiring independent brightness control for primary touchscreen and secondary status display. IC Role / Device Role / Timing Role: Dual constant-current LED driver providing regulated 15–20mA per string with matched current accuracy (<7.5mV FB offset) for uniform luminance. Use Value: Eliminates need for ballast resistors and factory calibration; enables software-controlled dimming ratio (e.g., 1:3) between panels while maintaining color consistency. |
Use Scenario: Compact digital cameras with high-resolution rear LCD needing efficient, low-noise backlight under battery-limited conditions. IC Role / Device Role / Timing Role: Single-chip solution driving 5–8 white LEDs from 3.6V Li-ion; uses 1.25MHz switching (RT = 39.1kΩ) to shrink inductors to 15µH. Use Value: Achieves 78% efficiency at 20mA/8-LED load, extending battery life; integrated Schottky diodes reduce component count versus discrete boost designs. |
| Automotive Instrument Cluster | Handheld Medical Device Display |
|
Use Scenario: Automotive cluster with segmented LCD requiring robust operation across –40°C to +85°C ambient and 9–16V supply range. IC Role / Device Role / Timing Role: Dual-channel driver powering upper/lower display zones; leverages wide VIN (2.7–24V) and guaranteed –40°C to 85°C performance per datasheet Note 2. Use Value: Open-circuit protection prevents fault propagation if one LED string fails; thermal pad ensures reliability at elevated under-hood temperatures. |
Use Scenario: Portable diagnostic tools with dual-status displays (e.g., waveform + parameter readout) operating from AA/AAA batteries. IC Role / Device Role / Timing Role: Powers 2–4 white LEDs per channel from 1.8–3V alkaline source using split-rail technique (inductors on battery, IC on 3.3V logic rail). Use Value: 25µA shutdown current extends shelf life; low 2.7V start-up enables use of nearly depleted batteries; small TSSOP footprint fits tight medical enclosures. |
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 |
|---|---|---|---|
| LT3467EFE#PBF | Same pinout, higher 42V OVP clamp, improved 0.18V FB reference, and lower 18µA shutdown current. | Better suited for 12V automotive or high-VF LED strings where 39.5V clamp is marginal; tighter current matching due to reduced FB tolerance. | Select when upgrading for higher reliability in harsh environments or tighter brightness matching is required; drop-in compatible with layout reuse. |
| TPS68400RGTR | Single-channel, 36V max output, no integrated diodes, requires external MOSFET and diode; 2.5V–6.5V VIN only. | Limited to lower-input systems (e.g., USB-powered); lacks dual independence and open-circuit protection-requires external fault handling. | Consider only for cost-sensitive, single-string designs where board space allows discrete components and thermal design accommodates external FET losses. |
Compared with LT3466EFE#PBF, LT3467EFE#PBF offers higher OVP headroom and lower quiescent current with identical layout, while TPS68400RGTR sacrifices integration and dual-channel capability for lower unit cost in simpler applications.
Availability
LT3466EFE#PBF is available at Aetrix Electronics and suitable for handheld consumer electronics, automotive instrument clusters, and portable medical device backlighting requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LT3466EFE#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 acquired Linear Technology in 2017 and maintains full product support, datasheets, and application engineering for legacy Linear parts including the LT3466 family.
The LT3466EFE#PBF belongs to Linear's high-efficiency LED driver product line, engineered specifically for dual-display backlighting in space-constrained, battery-operated portable devices with stringent EMI and thermal requirements.
FAQ
What is the maximum number of white LEDs the LT3466EFE#PBF can drive?
The LT3466EFE#PBF can drive up to 20 white LEDs total-10 in series per channel-based on its 39.5V open-circuit clamp voltage and typical white LED forward voltage of ~3.95V. At 3.6V input, it reliably powers 8 LEDs per string (e.g., 8/8 configuration), achieving 81% efficiency at 15mA per string.
Does the LT3466EFE#PBF require external Schottky diodes?
No. The LT3466EFE#PBF 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, reducing bill-of-materials count, PCB area, and potential failure points in portable designs.
How is dimming controlled on the LT3466EFE#PBF?
Dimming is controlled independently per channel via CTRL1 and CTRL2 pins. Applying 0–1.6V linearly scales LED current from 0% to 100%; voltages above 1.6V have no effect. Alternatively, a filtered PWM signal (e.g., 10kHz with RC corner <1kHz) can be applied to achieve precise digital brightness control without visible flicker.
What thermal considerations apply to the LT3466EFE#PBF in the TSSOP package?
The LT3466EFE#PBF in the 16-pin TSSOP (FE) package requires the exposed pad (Pin 17) to be soldered to a solid PCB ground plane. With θJC = 10°C/W and θJA = 38°C/W, proper thermal land design (≥4x thermal vias to inner ground layers) is essential to maintain junction temperature below 125°C at full load, especially in sealed handheld enclosures.
Can the LT3466EFE#PBF operate from a 2.7V input supply?
Yes. The LT3466EFE#PBF has a minimum operating voltage of 2.7V and includes undervoltage lockout that disables both converters below 2.1V (typ). It is qualified for operation from 2.7V–24V, making it suitable for single-cell Li-ion (2.7–4.2V), dual-AA (1.8–3.0V with split-rail), and industrial 12–24V systems.
LT3466EFE#PBF 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:
- 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#PBF FAQ
1.How can I place an order for LT3466EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3466EFE#PBF 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#PBF reliable?
The price and inventory of LT3466EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3466EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3466EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3466EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3466EFE#PBF?
LT3466EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3466EFE#PBF 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#PBF?
For technical support, including LT3466EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3466EFE#PBF requirements.
6.How does Aetrix verify that LT3466EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3466EFE#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT3466EFE#PBF?
All LT3466EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3466EFE#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT3466EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3466EFE#PBF Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
