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Analog Devices Inc. LT3486EDHC#TRPBF
- Part No.:
- LT3486EDHC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LT3486EDHC#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 1.3A 16DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT3486EDHC#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 up to 8 white LEDs each (16 total) from a single Li-Ion cell (2.5V–4.2V) or 12V supply. It delivers up to 1.3A per switch, regulates LED current with ±3% accuracy via 200mV feedback voltage, and supports 1000:1 PWM dimming without color shift - used in notebook display backlighting and camera flash modules.
For engineers reviewing the LT3486EDHC#TRPBF datasheet, LT3486EDHC#TRPBF pinout, LT3486EDHC#TRPBF application, or LT3486EDHC#TRPBF equivalent, key selection criteria include dual independent dimming control (CTRL/PWM pins), open-LED protection with 36V clamp, programmable 200kHz–2.5MHz switching frequency, thermal shutdown, and compatibility with low-ESR ceramic input/output capacitors and Schottky diodes in compact DFN packaging.
Technical Context
The LT3486EDHC#TRPBF implements two fully independent current-mode boost converters sharing only the bandgap reference (1.25V), oscillator, and start-up bias circuitry. Each channel features dedicated SW, VC, FB, CTRL, PWM, OVP, and current-sense paths enabling asymmetric LED string operation and independent fault handling.
Its control loop regulates LED current by maintaining 200mV at FB1/FB2 using internal error amplifiers that drive VC1/VC2 nodes; peak switch current is limited to 1.3A (typ), with duty cycle ranging from 90% (2MHz) to 98% (200kHz). Open-circuit protection clamps output to 36V (typ) by disabling the affected converter while allowing the other to remain active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 24V - supports single-cell Li-Ion (3V–4.2V) and 12V industrial rails without external LDO pre-regulation. |
| LED Current Accuracy | ±3% - achieved via 200mV ±3% feedback reference, enabling precise brightness matching across dual displays or camera flash arrays. |
| Switch Current Limit | 1.3A per channel - sufficient to drive 8×25mA white LEDs (200mA string) or 8×100mA high-brightness LEDs (800mA string) with margin. |
| Dimming Range | 1000:1 via PWM - no color shift due to constant-current regulation during PWM on/off cycles, critical for camera flash consistency. |
| Switching Frequency Range | 200kHz to 2.5MHz - set by external RT resistor; higher frequencies allow smaller inductors (e.g., 4.7µH at 2MHz), lower frequencies improve efficiency at high VIN/VOUT ratios. |
| Open-LED Clamp Voltage | 36V (typ) - protects downstream components when LED strings open; prevents overvoltage stress on output capacitors and diodes. |
| Shutdown Current | <1µA - enables ultra-low-power standby in battery-operated devices such as smartphones and portable medical displays. |
Pinout & Package
LT3486EDHC#TRPBF is housed in a 16-pin (5mm × 3mm × 0.75mm) plastic DFN package with exposed thermal pad (Pin 17) soldered to PCB ground for enhanced thermal dissipation (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1, SW2 (Pins 1, 16) | Internal NPN switch collector | Connects to inductor/diode node; must minimize trace area to reduce EMI; rated for 40V max and 1.3A peak current. |
| VIN (Pin 2) | Main power input | Accepts 2.5V–24V; requires local X5R/X7R ceramic bypass capacitor (≥10µF) to suppress input ripple and ensure stable startup. |
| OVP1, OVP2 (Pins 3, 14) | Output overvoltage sense | Monitors LED string output; triggers 36V clamp and disables respective converter if open-circuit detected. |
| RT (Pin 4) | Oscillator timing input | Connects to ground via resistor (e.g., 63.4kΩ for 800kHz); sets switching frequency with 0.54V nominal bias voltage. |
| VC1, VC2 (Pins 5, 12) | Error amplifier output | Drives compensation network (R+C to GND); controls peak switch current; clamped to 1.5V during open-circuit fault. |
| FB1, FB2 (Pins 6, 11) | Current-sense feedback input | Regulated to 200mV ±3%; connects to cathode of lowest LED + current-set resistor (RFB = 200mV/ILED). |
| CTRL1, CTRL2 (Pins 7, 10) | Analog dimming/shutdown control | 0–1.8V linearly scales LED current (0–100%); <75mV shuts down channel; >1.8V enables full current. |
| PWM1, PWM2 (Pins 8, 9) | Digital dimming enable | <0.4V disables channel; >0.9V enables; extends dimming to µA-levels without affecting color point. |
| SHDN (Pin 13) | Global shutdown input | <0.4V disables entire IC (IQ < 1µA); >1.6V enables operation; compatible with standard logic-level GPIOs. |
| REF (Pin 15) | 1.25V bandgap reference output | Stable 1.25V ±1% source; bypass with 0.1µF X5R/X7R cap; max load 50µA - usable for external biasing or sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent boost channels | Enables asymmetric LED configurations (e.g., 6-LED display + 8-LED flash) with separate CTRL/PWM control and fault isolation. |
| 1000:1 PWM dimming without color shift | Maintains consistent white point across full brightness range by preserving constant LED current during PWM on-time. |
| 36V open-LED output clamp | Prevents destructive overvoltage on output capacitors and diodes when LED strings fail open; allows continued operation of healthy channel. |
| Programmable 200kHz–2.5MHz switching | Optimizes trade-off between inductor size (smaller at high fSW) and efficiency (higher at low fSW) for specific input/output voltage conditions. |
| ±3% LED current accuracy | Ensures uniform brightness across dual displays or camera flash arrays without manual calibration or binning. |
| Thermal shutdown at 150°C | Protects die under sustained overload or poor PCB thermal design; resumes operation automatically after junction cools below 150°C. |
Applications
| Notebook PC Display | LED Camera Light for Cell Phones |
|---|---|
Use Scenario: Driving dual 8-LED backlight strings for high-resolution LCD panels in ultraportable notebooks powered by single-cell Li-Ion batteries. IC Role / Device Role / Timing Role: Dual constant-current boost controller providing independent brightness control per display zone and open-LED fault containment. Use Value: Enables thin, energy-efficient designs with uniform luminance and >10,000-hour backlight lifetime without current drift. |
Use Scenario: Powering high-intensity flash LEDs in smartphone rear cameras requiring precise 1000:1 dimming for still capture and video recording modes. IC Role / Device Role / Timing Role: Dual-channel LED driver delivering synchronized or independent flash pulses with zero color temperature shift across intensity levels. Use Value: Eliminates need for external current DACs or microcontroller-based PWM generation, reducing BOM count and firmware complexity. |
| Car Dashboard Lighting | Avionics Displays |
Use Scenario: Illuminating segmented instrument clusters and TFT LCDs in automotive cockpits operating from 9V–16V battery rails with wide temperature (-40°C to +85°C) requirements. IC Role / Device Role / Timing Role: Robust dual boost converter supporting extended input range and integrated overtemperature protection for under-hood environments. Use Value: Meets AEC-Q200 stress test requirements when combined with automotive-grade passives; eliminates discrete thermal monitoring circuitry. |
Use Scenario: Backlighting monochrome or color cockpit displays in commercial aircraft where reliability, EMI control, and fault tolerance are mission-critical. IC Role / Device Role / Timing Role: Fault-isolated dual LED driver with independent OVP and shutdown paths ensuring one failed channel does not compromise primary flight instrumentation. Use Value: Supports DO-160G Section 20 radiated emissions compliance via minimized SW node area and fixed-frequency operation. |
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 |
|---|---|---|---|
| LT3466EDHC#TRPBF | Single-channel 1.3A boost LED driver; lacks second channel and independent PWM/CTRL per string. | Suitable only for single-string applications (e.g., basic display backlight); cannot support dual-zone or flash+backlight architectures. | Select when system requires only one LED string and board space is constrained - saves ~30% footprint vs. dual-channel solution. |
| TPS68400RHDR | TI dual 1.2A boost driver with I²C interface; supports programmable current, frequency, and fault reporting - no analog CTRL/PWM pins. | Requires MCU firmware integration; better for smart lighting systems needing dynamic parameter adjustment; less suited for analog-dimming-only designs. | Choose when digital control, telemetry, or multi-device synchronization is required - adds flexibility at cost of added software overhead. |
Compared with LT3486EDHC#TRPBF, LT3466EDHC#TRPBF reduces integration but eliminates dual-string capability, while TPS68400RHDR replaces analog dimming with digital configurability - making LT3486EDHC#TRPBF optimal for cost-sensitive, analog-controlled dual-LED applications demanding proven reliability and minimal external components.
Availability
LT3486EDHC#TRPBF is available at Aetrix Electronics and suitable for notebook display backlighting, mobile camera flash modules, automotive dashboard illumination, and avionics display systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.
Supply support for LT3486EDHC#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 precision instrumentation, industrial automation, communications, and automotive markets.
The LT3486 belongs to Linear's legacy LED driver product line, engineered specifically for high-efficiency, dual-string white LED backlighting and flash applications in portable and harsh-environment electronics - emphasizing analog dimming fidelity, fault resilience, and compact DFN thermal performance.
FAQ
What is the maximum LED string voltage supported by the LT3486EDHC#TRPBF?
The LT3486EDHC#TRPBF provides open-circuit protection with a 36V (typ) clamp on OVP1/OVP2 pins, limiting maximum sustainable output voltage per channel to 36V. This supports up to 10–12 white LEDs (3.0–3.6V VF each) in series depending on forward voltage variation and temperature. Exceeding this voltage risks triggering shutdown or damaging external components.
Can the LT3486EDHC#TRPBF drive both LED strings simultaneously at different currents?
Yes, the LT3486EDHC#TRPBF supports asymmetric operation: RFB1 and RFB2 can be selected independently (e.g., 8.06Ω for 25mA on Channel 1, 20.0Ω for 10mA on Channel 2), and CTRL1/CTRL2 voltages can be set separately to scale each string's current from 0% to 100%, enabling dual-zone brightness control in displays or mixed flash/backlight use cases.
Does the LT3486EDHC#TRPBF require external compensation components?
Yes, the LT3486EDHC#TRPBF requires external RC networks from VC1 and VC2 to ground to stabilize the current-mode control loop. Typical values are 2.8kΩ + 4.7nF per channel (as shown in the front-page application circuit), tuned based on inductor value, switching frequency, and output capacitance to ensure phase margin >45° and prevent oscillation or overshoot.
How does the LT3486EDHC#TRPBF handle thermal overload?
The LT3486EDHC#TRPBF integrates a thermal shutdown circuit that disables both converters when junction temperature exceeds 150°C. Operation resumes automatically once die temperature falls below 150°C. The DFN package's exposed pad must be soldered to a thermal pad on the PCB to maintain θJA ≤ 43°C/W and avoid premature shutdown under continuous 1.3A/channel load.
Is the LT3486EDHC#TRPBF pin-compatible with other packages in the LT3486 family?
No, the LT3486EDHC#TRPBF (16-pin DFN) has different pinout and thermal pad configuration than the LT3486EFE#TRPBF (16-pin TSSOP). While both share identical electrical functionality and signal names, physical layout, solder reflow profile, and thermal vias differ - requiring separate PCB footprints and layout validation for each package variant.
LT3486EDHC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-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):
- 2.5V
- 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-DFN (5x3)
LT3486EDHC#TRPBF FAQ
1.How can I place an order for LT3486EDHC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3486EDHC#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 LT3486EDHC#TRPBF reliable?
The price and inventory of LT3486EDHC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3486EDHC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3486EDHC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3486EDHC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3486EDHC#TRPBF?
LT3486EDHC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3486EDHC#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 LT3486EDHC#TRPBF?
For technical support, including LT3486EDHC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3486EDHC#TRPBF requirements.
6.How does Aetrix verify that LT3486EDHC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3486EDHC#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 LT3486EDHC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3486EDHC#TRPBF?
All LT3486EDHC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3486EDHC#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 LT3486EDHC#TRPBF part is unused and in its original packaging.
Return procedure for LT3486EDHC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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