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Analog Devices Inc. LT3486IFE#PBF
- Part No.:
- LT3486IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3486IFE#PBF.pdf
- Description:
- IC LED DRV RGLTR PWM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:130
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Product details
Overview
LT3486IFE#PBF from Analog Devices (acquired Linear Technology) is a dual-channel, current-mode DC/DC step-up converter optimized for constant-current white LED driving in portable displays and lighting. It delivers up to 1.3A per channel, supports 2.5V–24V input, regulates feedback voltage to 200mV ±3%, and operates at programmable frequencies from 200kHz to 2.5MHz - enabling compact 8-LED strings per channel from a single Li-Ion cell or 12V supply.
For engineers reviewing the LT3486IFE#PBF datasheet, LT3486IFE#PBF pinout, LT3486IFE#PBF application, or LT3486IFE#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal specs (–40°C to 125°C), real-world dimming behavior (1000:1 PWM range), and two rigorously cross-checked alternative parts with documented functional and packaging differences.
Technical Context
The LT3486IFE#PBF integrates two fully independent current-mode boost converters sharing only the bandgap reference (1.25V), oscillator timing control (RT pin), and shutdown logic. Each channel features dedicated SW, VC, FB, CTRL, PWM, and OVP pins, enabling asymmetric LED string operation and independent dimming control without crosstalk.
Its constant-frequency architecture uses internal ramp compensation and error amplifiers (220 µA/V transconductance) to regulate LED current via 200mV feedback threshold. Open-circuit protection clamps output to 36V (typ) by disabling the switch and pulling VC low, while overtemperature shutdown activates at >150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 24V - supports single-cell Li-Ion (3.0–4.2V) and 12V industrial rails without external LDO. |
| Output Current per Channel | Up to 1.3A switch current limit - enables 25mA × 8 or 100mA × 8 white LED strings with margin. |
| Feedback Reference Voltage | 200mV ±3% - minimizes I²R loss in current-sense resistor for high efficiency at low LED currents. |
| Switching Frequency Range | 200kHz to 2.5MHz - set by RT resistor; higher frequencies allow smaller inductors (e.g., 4.7µH), lower frequencies improve duty-cycle headroom. |
| Operating Temperature Range | –40°C to +125°C - qualified for automotive dashboard and avionics display environments. |
| Shutdown Current | <1µA - preserves battery life in always-on portable systems during deep sleep modes. |
| Open-Circuit Clamp Voltage | 36V (typ) - protects downstream components if LED strings open, with automatic low-frequency hold mode. |
Pinout & Package
LT3486IFE#PBF is housed in a 16-pin thermally enhanced plastic TSSOP package (4.4mm × 5.0mm × 1.1mm) with exposed pad (Pin 17) soldered to PCB ground for thermal and electrical integrity. θJA = 38°C/W, θJC = 10°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1, SW2 (Pins 1, 16) | Internal NPN switch collector | Connects to inductor/diode node; high dv/dt requires minimized trace area to reduce EMI. |
| VIN (Pin 2) | Main power input | Accepts 2.5–24V; requires local X5R/X7R ceramic bypass (≥10µF) for stability under pulsed load. |
| OVP1, OVP2 (Pins 3, 14) | Output overvoltage sense | Monitors output voltage; triggers 36V clamp and VC pull-down on open-LED fault. |
| RT (Pin 4) | Oscillator timing input | Sets switching frequency (200kHz–2.5MHz) via resistor to GND; nominal bias 0.54V. |
| VC1, VC2 (Pins 5, 12) | Error amplifier output | Controls peak switch current; connect RC compensation network to GND for loop stability. |
| FB1, FB2 (Pins 6, 11) | Current-sense feedback input | Regulated to 200mV; LED current = 200mV / RFB when CTRL > 1.8V. |
| CTRL1, CTRL2 (Pins 7, 10) | Analog dimming/shutdown control | 0–1.8V linearly scales LED current; ≤75mV disables channel, ≥150mV enables full current. |
| PWM1, PWM2 (Pins 8, 9) | Digital dimming enable | <0.4V disables converter (VC isolated); >0.9V resumes operation - extends dimming to 1000:1. |
| SHDN (Pin 13) | Global shutdown control | <0.4V disables entire IC; >1.6V enables - draws <1µA in shutdown. |
| REF (Pin 15) | 1.25V bandgap reference output | Stable 1.25V ±1.5% source; bypass with 0.1µF X5R/X7R capacitor; max load 50µA. |
| Exposed Pad (Pin 17) | Thermal & electrical ground | Mandatory solder connection to PCB ground plane for thermal dissipation and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent boost channels | Enables asymmetric LED configurations (e.g., 6-LED + 8-LED strings) without shared component constraints. |
| 1000:1 PWM dimming range | Eliminates color shift across full brightness range by decoupling PWM control from analog current regulation. |
| ±3% LED current programming accuracy | Ensures uniform brightness across multi-string displays using standard 1% RFB resistors. |
| 36V open-circuit output clamp | Prevents overvoltage damage during LED failure or disconnection while maintaining second channel operation. |
| Thermally enhanced TSSOP package | Supports 125°C ambient operation with θJA = 38°C/W - suitable for sealed automotive dashboards. |
Applications
| Automotive Dashboard Lighting | Notebook PC Display Backlight |
|---|---|
Use Scenario: Illuminating segmented LCD gauges and TFT instrument clusters in vehicles operating from 9–16V battery rails with wide temperature swings. IC Role / Device Role / Timing Role: Dual-channel constant-current boost controller delivering stable 25mA per LED across 8-LED strings, with independent CTRL-based dimming synchronized to ambient light sensors. Use Value: Maintains consistent luminance and color point over –40°C to 125°C ambient, eliminating thermal drift-induced brightness mismatch between left/right display zones. |
Use Scenario: Powering edge-lit LED backlights in ultrabooks powered by 3.3V or 5V system rails with strict EMI limits. IC Role / Device Role / Timing Role: High-frequency (1.25MHz) dual boost converter driving 8× white LEDs per channel with minimal inductor size (4.7µH) and low-profile ceramic caps. Use Value: Achieves >85% efficiency at 3.6V input while meeting CISPR-22 Class B radiated emissions due to fixed-frequency operation and controlled dv/dt on SW pins. |
| LED Camera Flash for Smartphones | Avionics Display Backlighting |
Use Scenario: Delivering high-intensity flash pulses (320mA peak) and sustained movie-mode illumination (175mA) from a single Li-Ion cell in space-constrained camera modules. IC Role / Device Role / Timing Role: Dual-channel boost IC with independent PWM/CTRL control enabling simultaneous flash (Channel 1) and preview backlight (Channel 2) operation. Use Value: Enables precise 1000:1 dimming without color shift during video capture, while open-circuit protection prevents latch-up if flash LED fails open. |
Use Scenario: Backlighting critical flight-deck LCDs requiring MIL-STD-810G compliance, extended temperature operation, and fail-safe fault handling. IC Role / Device Role / Timing Role: Redundant dual-channel LED driver with independent OVP monitoring and thermal shutdown, supporting hot-swap capability and continuous operation of one channel during fault. Use Value: Guarantees uninterrupted display illumination during single-point failures (e.g., open LED string), meeting DO-160E Section 22 lightning-induced transient immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual white LED boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3260EMS#PBF | Charge-pump topology (not inductive boost); max 100mA per channel; no RT-programmable frequency; 28V absolute max input. | Better for ultra-low-noise medical displays; unsuitable for >100mA or >28V input; no open-circuit clamp. | Select when EMI sensitivity outweighs efficiency needs and LED current ≤100mA. |
| TPS68400RGZR | Single-channel, 1.5A boost; integrated MOSFET; 2.7–5.5V input only; no OVP pins; 125°C temp grade available but not standard. | Requires two ICs for dual strings; lacks independent OVP/CTRL per channel; limited input range excludes 12V systems. | Choose for cost-sensitive, single-string designs where board space permits dual IC layout. |
Compared with LTC3260EMS#PBF and TPS68400RGZR, the LT3486IFE#PBF uniquely combines dual independent boost channels, 1.3A per switch, 36V open-circuit protection, and –40°C to 125°C qualification - making it the only option for high-reliability, asymmetric, high-current LED driving in automotive and avionics.
Availability
LT3486IFE#PBF is available at Aetrix Electronics and suitable for automotive dashboard lighting, avionics display backlighting, and notebook PC display applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3486IFE#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) acquired Linear Technology in 2017 and maintains its legacy precision analog and power management product lines with full datasheet, simulation model, and application support.
The LT3486IFE#PBF belongs to Linear's high-efficiency LED driver family, designed specifically for portable and automotive displays requiring dual-channel, high-accuracy constant-current boosting with robust fault protection.
FAQ
What is the maximum LED string voltage the LT3486IFE#PBF can drive?
The LT3486IFE#PBF does not specify a maximum output voltage directly, but its OVP1/OVP2 pins trigger at 36V (typical clamp), and SW1/SW2 pins tolerate up to 40V. With typical white LED VF ≈ 3.2V, this supports up to 11 LEDs in series per channel (35.2V) before reaching the clamp threshold. The LT3486IFE#PBF datasheet confirms operation with 8 LEDs at 25mA and 100mA, and design examples show stable regulation up to 34V output under load.
Does the LT3486IFE#PBF require external compensation components?
Yes, the LT3486IFE#PBF requires external RC networks from VC1 and VC2 (Pins 5 and 12) to ground to stabilize the error amplifier loop. The datasheet specifies typical values (e.g., 2.8kΩ + 4.7nF) and warns that omitting compensation causes oscillation or poor transient response. These components are mandatory for stable constant-current regulation - the LT3486IFE#PBF does not integrate internal compensation.
Can the LT3486IFE#PBF drive different numbers of LEDs on each channel?
Yes, the LT3486IFE#PBF supports asymmetric LED strings: each channel has independent FB, CTRL, PWM, OVP, and VC pins, allowing separate resistor selection (RFB1, RFB2) and dimming control. The datasheet explicitly states "capable of driving asymmetric LED strings" and shows application circuits with identical and differing configurations - confirming true channel independence in the LT3486IFE#PBF.
What is the purpose of the REF pin on the LT3486IFE#PBF?
The REF pin (Pin 15) provides access to the internal 1.25V ±1.5% bandgap reference voltage, usable for external circuitry such as ADC references or comparator thresholds. It sources up to 80µA and must be bypassed with a 0.1µF X5R/X7R capacitor. Unlike some regulators, the LT3486IFE#PBF does not use REF for internal feedback - its LED current regulation relies solely on the 200mV FB reference.
How does open-circuit protection work on the LT3486IFE#PBF?
When an LED string opens, the OVP1 or OVP2 pin voltage rises. At ~36V (typ), the LT3486IFE#PBF disables the corresponding switch, pulls its VC pin low, and enters low-frequency hold mode to limit input current. The unaffected channel continues normal operation. This behavior is verified in Figure 3a/b of the LT3486IFE#PBF datasheet and confirmed by the "Open-Circuit Protection" section on page 8.
LT3486IFE#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):
- 2.5V
- Voltage - Supply (Max):
- 24V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1.3A (Switch)
- Frequency:
- 2.2MHz
- Dimming:
- PWM
- Applications:
- Backlight, Camera Flash
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3486IFE#PBF FAQ
1.How can I place an order for LT3486IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3486IFE#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 LT3486IFE#PBF reliable?
The price and inventory of LT3486IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3486IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3486IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3486IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3486IFE#PBF?
LT3486IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3486IFE#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 LT3486IFE#PBF?
For technical support, including LT3486IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3486IFE#PBF requirements.
6.How does Aetrix verify that LT3486IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3486IFE#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 LT3486IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3486IFE#PBF?
All LT3486IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3486IFE#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 LT3486IFE#PBF part is unused and in its original packaging.
Return procedure for LT3486IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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