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Analog Devices Inc. LT3486IFE#TRPBF
- Part No.:
- LT3486IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3486IFE#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,783
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Product details
Overview
LT3486IFE#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, current-mode DC/DC step-up converter IC designed to drive two independent strings of white LEDs at constant current from low-input sources such as single-cell Li-Ion batteries (2.5V–4.2V) or 12V supplies. It delivers up to 1.3A per switch, supports 1000:1 PWM dimming, features ±3% LED current accuracy, 200mV feedback reference, and integrated open-LED protection with 36V clamp. It is used in notebook display backlighting and automotive dashboard lighting where precise, independent LED brightness control is required.
For engineers reviewing the LT3486IFE#TRPBF datasheet, LT3486IFE#TRPBF pinout, LT3486IFE#TRPBF application, or LT3486IFE#TRPBF equivalent, this page provides verified technical context, package-specific pin functions, real-world dimming behavior, thermal performance data for industrial-temperature operation (–40°C to +125°C), and validated alternative parts for design continuity.
Technical Context
The LT3486IFE#TRPBF implements two fully independent, fixed-frequency current-mode boost converters sharing only the bandgap reference (1.25V), oscillator timing input (RT), and shutdown control. Each channel uses a dedicated error amplifier (VC1/VC2), feedback comparator (200mV threshold), and power switch with 1.3A current limit and 300mV saturation voltage.
It supports dual dimming modes: analog control via CTRL1/CTRL2 pins (0–1.8V linear range) and extended-range PWM dimming via PWM1/PWM2 pins (0.4V low / 0.9V high logic thresholds), enabling µA-level current regulation without color shift. Open-circuit protection clamps outputs at 36V (typ) while maintaining operation of the healthy channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 24V - supports single Li-Ion (3V–4.2V) and 12V systems without external LDO pre-regulation. |
| Output Current per Channel | Up to 1.3A switch current - enables driving 8×25mA or 8×100mA LED strings with margin. |
| Feedback Reference Voltage | 200mV ±3% - minimizes I²R loss in current-sense resistor, improving efficiency at high LED currents. |
| Switching Frequency Range | 200kHz to 2.5MHz - set by external RT resistor; higher frequencies allow smaller inductors (e.g., 4.7µH at 2MHz). |
| Dimming Range | 1000:1 via PWM - achieved without color shift due to constant-current regulation during PWM off-cycles. |
| Thermal Rating | –40°C to +125°C junction - qualified for automotive instrument cluster and industrial display applications. |
| Open-LED Clamp Voltage | 36V (typ) on OVP1/OVP2 - prevents overvoltage damage when LED strings disconnect; maintains safe operation of second channel. |
Pinout & Package
LT3486IFE#TRPBF is packaged in a 16-pin thermally enhanced TSSOP with exposed pad (Pin 17 = GND). The exposed pad must be soldered to PCB ground for thermal dissipation and electrical stability. θJA = 38°C/W, θJC = 10°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 (Pin 1) | Power Switch Collector (Channel 1) | Connects to inductor and Schottky diode anode; carries peak 1.3A switching current; minimize trace area to reduce EMI. |
| VIN (Pin 2) | Main Input Supply | Accepts 2.5V–24V; requires local 10µF X5R/X7R ceramic bypass capacitor for stable operation. |
| OVP1 (Pin 3) | Output Overvoltage Sense (Ch1) | Monitors output voltage; triggers 36V clamp and disables SW1 if open-LED condition detected. |
| RT (Pin 4) | Oscillator Timing Input | Connects to ground via resistor (e.g., 63.4kΩ for 800kHz); sets frequency from 200kHz–2.5MHz. |
| VC1 (Pin 5) | Error Amplifier Output (Ch1) | Drives compensation network; controls peak switch current; clamped at 1.5V during open-circuit fault. |
| FB1 (Pin 6) | Current-Sense Feedback (Ch1) | Regulated to 200mV; connects to cathode of lowest LED and RFB1; sets ILED = 200mV/RFB1. |
| CTRL1 (Pin 7) | Analog Dimming/Shutdown (Ch1) | 0–1.8V adjusts LED current linearly; ≤75mV shuts down channel; >1.8V enables full current. |
| PWM1 (Pin 8) | PWM Dimming Enable (Ch1) | ≤0.4V disables channel; ≥0.9V enables; extends dimming to 1000:1 without color shift. |
| PWM2 (Pin 9) | PWM Dimming Enable (Ch2) | Independent control for second channel; identical logic thresholds and function as PWM1. |
| CTRL2 (Pin 10) | Analog Dimming/Shutdown (Ch2) | Independent analog dimming input; same voltage thresholds and behavior as CTRL1. |
| FB2 (Pin 11) | Current-Sense Feedback (Ch2) | Identical function to FB1; regulates to 200mV; sets ILED2 = 200mV/RFB2. |
| VC2 (Pin 12) | Error Amplifier Output (Ch2) | Independent VC node; clamped at 1.5V during Ch2 open-circuit fault. |
| SHDN (Pin 13) | Global Shutdown | ≤0.4V disables entire IC; ≥1.6V enables operation; draws <1µA in shutdown. |
| OVP2 (Pin 14) | Output Overvoltage Sense (Ch2) | Same function as OVP1 but for Channel 2; enables independent fault detection. |
| REF (Pin 15) | Internal Bandgap Reference | 1.25V ±1%, 50µA max load; bypass with 0.1µF X5R/X7R capacitor to GND. |
| SW2 (Pin 16) | Power Switch Collector (Channel 2) | Identical to SW1; handles independent 1.3A switching current for second LED string. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent boost channels | Enables asymmetric LED string configurations (e.g., 6-LED + 8-LED) without cross-talk or shared regulation errors. |
| 1000:1 PWM dimming without color shift | Preserves white LED chromaticity across full brightness range by maintaining constant current during active PWM cycles. |
| ±3% LED current programming accuracy | Ensures uniform brightness across displays using precision RFB resistors (1% tolerance recommended). |
| 36V open-LED output clamp | Prevents destructive overvoltage on disconnected strings while allowing functional channel to operate normally. |
| Thermally enhanced TSSOP (–40°C to +125°C) | Validated for under-hood automotive and industrial environments where ambient temperatures exceed 85°C. |
Applications
| Notebook PC Display | LED Camera Light for Cell Phones |
|---|---|
Use Scenario: Driving dual 8-LED backlight strings for 13–15″ LCD panels powered by single Li-Ion cell. IC Role / Device Role / Timing Role: Dual constant-current boost controller providing independent brightness control per zone. Use Value: Enables uniform luminance and flicker-free dimming down to 0.01× full brightness without requiring external current DACs. |
Use Scenario: Powering flash and video illumination LEDs in smartphones with separate intensity control for still capture vs. video mode. IC Role / Device Role / Timing Role: Dual-channel LED driver supporting simultaneous high-current flash (320mA) and low-current video light (25mA). Use Value: Eliminates need for two discrete drivers; reduces BOM count and PCB area while maintaining independent thermal management. |
| Car Dashboard Lighting | Avionics Displays |
Use Scenario: Illuminating segmented TFT clusters in automotive instrument panels with wide temperature operation and EMI robustness. IC Role / Device Role / Timing Role: High-reliability LED driver meeting AEC-Q200 stress requirements via –40°C to +125°C qualification. Use Value: Delivers stable LED current despite battery voltage sag (down to 2.5V) and engine cranking transients. |
Use Scenario: Backlighting critical flight-deck LCDs where failure modes must be contained and redundancy preserved. IC Role / Device Role / Timing Role: Fault-isolated dual boost converter with independent OVP and thermal shutdown per channel. Use Value: Single-point failure in one channel does not affect the other-enabling continued partial display functionality during fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual white LED boost driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3260EMS#TRPBF | Inverting charge-pump architecture; no inductors; max 100mA per channel; 28V absolute max output. | Suitable for space-constrained, low-noise portable devices; cannot drive 8-LED strings at 25mA from Li-Ion due to lower current capability. | Select when inductor-free layout and ultra-low EMI are prioritized over high-current LED drive capability. |
| TPS61165DRVR | Single-channel boost; 40V OVP; 1.2A switch; supports I²C interface; no independent CTRL/PWM per channel. | Requires two ICs for dual-string control; lacks per-channel analog dimming; adds firmware overhead for brightness coordination. | Choose when digital control (I²C) and programmable safety limits are needed, and dual independent analog control is not required. |
Compared with LTC3260EMS#TRPBF and TPS61165DRVR, the LT3486IFE#TRPBF uniquely delivers dual independent 1.3A boost channels with analog + PWM dimming, 36V open-LED protection, and industrial-temperature qualification-making it optimal for high-brightness, fault-tolerant display lighting where component count and thermal resilience are critical.
Availability
LT3486IFE#TRPBF is available at Aetrix Electronics and suitable for notebook PC display backlighting, automotive dashboard lighting, and avionics display systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3486IFE#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and aerospace markets.
The LT3486IFE#TRPBF belongs to Linear's legacy LED driver product line, engineered specifically for high-efficiency, high-reliability backlight and illumination systems demanding dual-channel independence, wide dimming range, and robust fault protection.
FAQ
What is the maximum LED string voltage the LT3486IFE#TRPBF can support?
The LT3486IFE#TRPBF does not specify a maximum output voltage directly, but its OVP1 and OVP2 pins clamp at 36V (typical) during open-circuit conditions. With typical Schottky diode forward drop (~0.4V) and switch VCE(SAT) (~0.3V), the practical maximum regulated output is ~35V. This supports up to 10 standard white LEDs (3.2V VF each) in series per channel when powered from 12V input.
Does the LT3486IFE#TRPBF require external compensation components?
Yes, the LT3486IFE#TRPBF requires external RC networks from VC1 and VC2 to ground for loop stability. These compensate the current-mode control loop and must be selected based on inductor value, output capacitance, and desired phase margin. Typical values are 2.8kΩ and 4.7nF per channel, as shown in the front-page application schematic.
Can the LT3486IFE#TRPBF operate from a 5V input to drive 8 white LEDs?
Yes, the LT3486IFE#TRPBF supports input voltages from 2.5V to 24V. At 5V input, it can drive 8 white LEDs (VF ≈ 3.2V × 8 = 25.6V) using appropriate inductor and timing resistor selection (e.g., RT = 63.4kΩ for 800kHz). Efficiency remains >80% across the full 5–25mA LED current range per string, as confirmed in Figure 6b of the datasheet.
How does the LT3486IFE#TRPBF handle thermal overload?
The LT3486IFE#TRPBF incorporates overtemperature protection that disables both converters when junction temperature exceeds 150°C. Operation resumes automatically once die temperature falls below 150°C. Its thermally enhanced TSSOP package (θJA = 38°C/W) and exposed pad requirement ensure reliable operation up to +125°C ambient when properly mounted on a 2-oz copper PCB with thermal vias.
Is the LT3486IFE#TRPBF pin-compatible with other variants like LT3486EFE#TRPBF?
Yes, the LT3486IFE#TRPBF shares identical pinout and footprint with LT3486EFE#TRPBF and LT3486EDHC#TRPBF. All are 16-pin packages (TSSOP or DFN) with matching signal assignments. The key difference is temperature rating: LT3486IFE#TRPBF is rated for –40°C to +125°C, while LT3486EFE#TRPBF is rated for –40°C to +85°C. No PCB changes are required for substitution within thermal limits.
LT3486IFE#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):
- 2.5V
- 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#TRPBF FAQ
1.How can I place an order for LT3486IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3486IFE#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 LT3486IFE#TRPBF reliable?
The price and inventory of LT3486IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3486IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3486IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3486IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3486IFE#TRPBF?
LT3486IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3486IFE#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 LT3486IFE#TRPBF?
For technical support, including LT3486IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3486IFE#TRPBF requirements.
6.How does Aetrix verify that LT3486IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3486IFE#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 LT3486IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3486IFE#TRPBF?
All LT3486IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3486IFE#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 LT3486IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3486IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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