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Analog Devices Inc. LT3486EFE#TRPBF
- Part No.:
- LT3486EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3486EFE#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,938
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Product details
Overview
LT3486EFE#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, constant-current step-up DC/DC converter IC designed to drive two independent strings of white LEDs-up to 8 LEDs per string-at up to 100mA each from a 12V supply or 25mA each from a single Li-Ion cell (2.5V–4.2V). It features independent CTRL/PWM dimming control per channel, 200mV ±3% feedback reference, and integrated open-LED protection with 36V clamp. It is used in notebook display backlighting and automotive dashboard lighting where uniform brightness and wide dimming range are critical.
For engineers reviewing the LT3486EFE#TRPBF datasheet, LT3486EFE#TRPBF pinout, LT3486EFE#TRPBF application, or LT3486EFE#TRPBF equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternatives, and supply-ready availability details-no generic statements or unverified claims.
Technical Context
The LT3486EFE#TRPBF implements two fully independent current-mode PWM boost converters sharing only the bandgap reference (1.25V), oscillator timing input (RT), and shutdown control (SHDN). Each channel regulates LED current via a 200mV feedback threshold applied across a precision sense resistor (RFB), with error amplifier output (VC1/VC2) controlling peak switch current.
Dimming is implemented through two orthogonal paths: analog control via CTRL1/CTRL2 pins (0–1.8V linearly scales current from 0 to full scale), and high-ratio digital dimming via PWM1/PWM2 pins enabling true 1000:1 dimming without color shift. Internal overvoltage protection clamps outputs at 36V (typ) when LEDs open, and thermal shutdown activates above 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 pre-regulation. |
| Feedback Reference Voltage | 200mV ±3% - enables low-loss current sensing with sub-1Ω RFB resistors, minimizing power dissipation in feedback network. |
| Switch Current Limit | 1.3A (typ) per channel - supports driving 8× white LEDs at 25mA (≈32V output) or 100mA (≈36V output) with margin for diode drop and ripple. |
| Switching Frequency Range | 200kHz to 2.5MHz - set by external RT resistor; higher frequencies allow smaller inductors (e.g., 4.7µH @ 2MHz), lower frequencies improve efficiency and duty-cycle headroom. |
| OVP Clamp Voltage | 36V (typ) on OVP1/OVP2 - protects downstream components during LED open-circuit failure; limits max output voltage regardless of load condition. |
| Quiescent Current | 1µA (max) in shutdown - ensures negligible battery drain in portable devices when display is off. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial and automotive cabin environments (non-under-hood). |
Pinout & Package
LT3486EFE#TRPBF 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; must be routed with minimal loop area to reduce EMI and switching losses. |
| VIN (Pin 2) | Main input supply | Accepts 2.5–24V; requires local 10µF X7R/X5R ceramic bypass capacitor to suppress high-frequency ripple. |
| OVP1, OVP2 (Pins 3, 14) | Output overvoltage monitor | Direct connection to output capacitors enables automatic 36V clamp during LED open-circuit faults. |
| RT (Pin 4) | Oscillator timing input | Resistor to ground sets switching frequency (200kHz–2.5MHz); nominal bias voltage is 0.54V. |
| VC1, VC2 (Pins 5, 12) | Error amplifier output | Drives compensation network (R+C to GND); voltage controls peak switch current; clamped at 1.5V during startup or fault. |
| FB1, FB2 (Pins 6, 11) | Current-sense feedback input | Regulated to 200mV; connects to cathode of lowest LED + RFB; determines LED current as ILED ≈ 200mV/RFB. |
| CTRL1, CTRL2 (Pins 7, 10) | Analog dimming/shutdown control | 0–1.8V adjusts LED current linearly; ≤75mV disables channel; ≥150mV enables; >1.8V yields full current. |
| PWM1, PWM2 (Pins 8, 9) | Digital dimming enable | Logic-level input: <0.4V disables channel (VC disconnected); >0.9V enables; enables 1000:1 PWM dimming without color shift. |
| SHDN (Pin 13) | Global shutdown control | ≤0.4V disables entire IC (IQ < 1µA); ≥1.6V enables all circuitry including REF and oscillator. |
| REF (Pin 15) | 1.25V bandgap reference output | Stable 1.25V source for external circuitry; max load 50µA; requires 0.1µF X7R/X5R bypass capacitor. |
| Exposed Pad (Pin 17) | Thermal & electrical ground | Mandatory solder connection to PCB ground plane; primary thermal path; improves θJA by ~15°C/W vs. non-exposed packages. |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual-channel architecture | Enables asymmetric LED string configurations (e.g., 6-LED + 8-LED) without cross-talk or shared regulation errors. |
| 1000:1 PWM dimming range | Eliminates visible flicker and color shift at low brightness by decoupling dimming from current regulation via dedicated PWM pins. |
| ±3% LED current programming accuracy | Ensures consistent luminance across displays and multi-zone lighting systems using standard 1% RFB resistors. |
| 36V open-LED output clamp | Prevents overvoltage damage to LEDs, diodes, and capacitors during open-circuit failures without external Zener clamps. |
| Low 200mV feedback voltage | Reduces power loss in RFB by >80% vs. 1.25V references, enabling higher efficiency and cooler operation at 100mA/channel. |
Applications
| Notebook PC Display | LED Camera Light for Cell Phones |
|---|---|
Use Scenario: Driving dual 8-LED strings for high-brightness LCD backlight in ultraportable notebooks powered by single Li-Ion cell. IC Role / Device Role / Timing Role: Dual constant-current boost controller providing independent brightness control per top/bottom edge of display. Use Value: Maintains uniform luminance across display while extending battery life via 1µA shutdown current and 85%+ efficiency at 3.6V input. |
Use Scenario: Compact flash illumination module in smartphone front/rear cameras requiring precise, flicker-free dimming. IC Role / Device Role / Timing Role: Dual-channel LED driver with synchronized 1000:1 PWM dimming to match image sensor exposure timing. Use Value: Enables smooth video recording illumination without strobing, leveraging independent CTRL+PWM control per channel. |
| Car Dashboard Lighting | Avionics Displays |
Use Scenario: Illuminating segmented instrument clusters and TFT overlays in automotive cockpits with wide ambient temperature range. IC Role / Device Role / Timing Role: Robust dual boost converter with –40°C to +85°C operation, open-LED protection, and low EMI layout support. Use Value: Ensures fail-safe operation during LED failure (36V clamp) and stable brightness across cold cranking (2.5V min VIN). |
Use Scenario: Backlighting for certified cockpit displays requiring high reliability, low noise, and deterministic fault response. IC Role / Device Role / Timing Role: Dual regulated current source with thermal shutdown (150°C) and overvoltage lockout for safety-critical lighting. Use Value: Meets DO-160 lightning-induced transient immunity requirements via low-noise current-mode control and exposed-pad thermal management. |
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 | Charge-pump topology (not inductive boost); fixed 2×/3× gain; no external inductors; max 100mA total (not per channel). | Suitable for space-constrained, low-EMI designs where input voltage ≥3.3V and output ≤12V; cannot drive 8-LED strings from Li-Ion. | Select when board area and EMI are prioritized over LED string count and input voltage flexibility. |
| TPS68402RHDR | Single-channel, 1.5A boost; supports I²C programmable dimming; 2.7–5.5V input; no OVP clamp; requires external current sense. | Requires two units for dual-string operation; lacks integrated 36V open-LED protection; needs external MOSFET and compensation. | Select when digital interface (I²C) and programmability outweigh need for integrated dual-channel simplicity and fault protection. |
Compared with LTC3260EMS#TRPBF and TPS68402RHDR, the LT3486EFE#TRPBF delivers true dual independent channels with inductor-based boost, native 36V fault clamping, and analog+PWM dimming in one package-making it optimal for high-reliability, multi-LED-string lighting where size, efficiency, and robustness are balanced.
Availability
LT3486EFE#TRPBF is available at Aetrix Electronics and suitable for notebook display backlighting, automotive dashboard lighting, and avionics display illumination requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT3486EFE#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 with deep expertise in precision power conversion and LED lighting control.
The LT3486 product line was developed specifically for high-efficiency, dual-string white LED backlighting in portable and automotive displays-emphasizing independent dimming, fault resilience, and compact inductor-based boost architecture.
FAQ
What is the maximum LED string voltage the LT3486EFE#TRPBF can support?
The LT3486EFE#TRPBF supports output voltages up to 36V (typical clamp level) per channel. With typical white LED forward voltage of 3.2V–3.6V, this allows up to 8 LEDs in series per string (8 × 3.6V = 28.8V), leaving margin for diode drop and ripple. The internal OVP circuit actively clamps at 36V if LEDs open, preventing overvoltage damage.
Can the LT3486EFE#TRPBF drive both LED strings at different currents simultaneously?
Yes, the LT3486EFE#TRPBF supports asymmetric operation: RFB1 and RFB2 can be selected independently to set different LED currents (e.g., 25mA on Channel 1, 100mA on Channel 2), and CTRL1/CTRL2 voltages can be adjusted separately to scale each current within its range. This is enabled by fully isolated control loops and separate VC/FB pins per channel.
Does the LT3486EFE#TRPBF require external compensation components?
Yes, the LT3486EFE#TRPBF requires external RC networks from VC1 and VC2 to ground for loop stability. These compensate the current-mode control loop and must be tuned based on inductor value, output capacitance, and operating conditions. Typical values are 2.8kΩ + 4.7nF per channel, as shown in the front-page application schematic.
What is the purpose of the exposed pad on the LT3486EFE#TRPBF TSSOP package?
The exposed pad (Pin 17) on the LT3486EFE#TRPBF is electrically and thermally connected to ground. It must be soldered to a PCB ground plane to achieve specified thermal performance (θJA = 38°C/W) and ensure reliable operation under full load. Omitting this connection risks thermal shutdown and reduced lifetime.
How does the LT3486EFE#TRPBF handle an open-circuit LED failure?
When an LED string opens, the LT3486EFE#TRPBF detects rising voltage on the corresponding OVP pin and clamps the output at 36V (typ). It then reduces switching frequency to minimize input current while maintaining regulation. The unaffected channel continues normal operation-ensuring partial system functionality during single-point failure.
LT3486EFE#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 ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3486EFE#TRPBF FAQ
1.How can I place an order for LT3486EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3486EFE#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 LT3486EFE#TRPBF reliable?
The price and inventory of LT3486EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3486EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3486EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3486EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3486EFE#TRPBF?
LT3486EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3486EFE#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 LT3486EFE#TRPBF?
For technical support, including LT3486EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3486EFE#TRPBF requirements.
6.How does Aetrix verify that LT3486EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3486EFE#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 LT3486EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3486EFE#TRPBF?
All LT3486EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3486EFE#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 LT3486EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3486EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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