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Analog Devices Inc. LT3486EDHC#PBF
- Part No.:
- LT3486EDHC#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LT3486EDHC#PBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 1.3A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:136
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Product details
Overview
LT3486EDHC#PBF 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 or 2.5V–24V supply. It delivers 1.3A switch current per channel, 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 circuits.
For engineers reviewing the LT3486EDHC#PBF datasheet, LT3486EDHC#PBF pinout, LT3486EDHC#PBF application, or LT3486EDHC#PBF equivalent, key selection criteria include dual independent dimming control (CTRL/PWM pins), open-LED protection with 36V clamp, fixed-frequency operation adjustable from 200kHz to 2.5MHz via RT resistor, thermal shutdown at 150°C, and compatibility with low-ESR ceramic input/output capacitors and Schottky diodes.
Technical Context
The LT3486EDHC#PBF implements two fully independent current-mode boost converters sharing only the bandgap reference (1.25V), oscillator, and start-up bias circuitry. Each channel uses a 1.3A internal NPN switch with 300mV saturation voltage and regulates LED current by maintaining 200mV across its dedicated FB pin using an error amplifier with 220µA/V transconductance.
Dimming is implemented through two orthogonal paths: analog control via CTRL pins (0–1.8V linearly scales current from 0 to full scale) and high-resolution PWM control via dedicated PWM1/PWM2 pins (0.4V low / 0.9V high logic thresholds). Open-circuit protection activates when OVP1/OVP2 detect >36V, clamping output and reducing switching frequency to limit input current.
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 Voltage (FB1/FB2) | 200mV ±3% - enables precise LED current setting (e.g., 25mA with 8.06Ω RFB) and minimizes I²R loss in current-sense resistor. |
| Switch Current Limit | 1.3A per channel - sufficient to drive 8× white LEDs at 25mA (or 100mA from 12V) with margin for peak inductor current. |
| 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 and duty-cycle headroom. |
| OVP Clamp Voltage | 36V typical - protects downstream components during LED string open-circuit failure; prevents uncontrolled voltage runaway. |
| Shutdown Current | <1µA - ensures negligible battery drain in portable devices when SHDN pin is pulled low. |
| Operating Temperature | –40°C to +85°C - qualified for commercial and industrial ambient environments; junction limited to 125°C with thermal shutdown at 150°C. |
Pinout & Package
LT3486EDHC#PBF 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 | Circuit Role | Design Meaning |
|---|---|---|
| SW1, SW2 (1, 16) | Internal NPN switch collector | Connects to inductor/diode node; high dv/dt requires minimized trace area to reduce EMI radiation. |
| VIN (2) | Main power input | Accepts 2.5–24V; must be bypassed locally with ≥10µF X5R/X7R ceramic capacitor to suppress input ripple and transient spikes. |
| OVP1, OVP2 (3, 14) | Output overvoltage sense | Direct connection to output capacitor cathode enables 36V clamp activation on LED string disconnection or failure. |
| RT (4) | Oscillator timing input | Resistor to ground sets switching frequency (200kHz–2.5MHz); nominal 0.54V bias enables accurate frequency programming. |
| VC1, VC2 (5, 12) | Error amplifier output | Drives compensation network (R+C to GND); voltage controls peak switch current; clamped to 1.5V during open-circuit fault. |
| FB1, FB2 (6, 11) | Current-sense feedback input | Regulated to 200mV; connects to cathode of lowest LED + RFB to set ILED = 200mV/RFB (e.g., 25mA @ 8.06Ω). |
| CTRL1, CTRL2 (7, 10) | Analog dimming/shutdown control | 0–1.8V adjusts LED current linearly; ≤75mV disables channel; ≥150mV enables; >1.8V yields full current - no further scaling. |
| PWM1, PWM2 (8, 9) | Digital dimming enable/disable | 0.4V low disables converter (VC disconnected); ≥0.9V resumes regulation - enables µA-level dimming resolution without color shift. |
| SHDN (13) | Global enable/disable | ≤0.4V shuts down entire IC (ICC <1µA); ≥1.6V enables bandgap, oscillator, and both converters. |
| REF (15) | 1.25V bandgap reference output | Stable 1.25V source for external circuitry; max 50µA load; requires 0.1µF ceramic bypass to GND. |
| GND (17, Exposed Pad) | Power and thermal ground | Exposed pad must be soldered to solid PCB ground plane for electrical integrity and thermal conduction (θJC = 4°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent boost channels | Enables asymmetric LED string configurations (e.g., 6-LED + 8-LED) with separate CTRL/PWM control - eliminates need for two discrete converters. |
| 1000:1 PWM dimming range | Preserves white LED chromaticity (no color shift) while enabling ultra-low-light operation down to microampere LED currents via dedicated PWM pins. |
| Open-LED protection with 36V clamp | Prevents destructive overvoltage on output capacitors and diodes during LED string breakage - maintains system reliability without external crowbar circuitry. |
| 200mV precision feedback voltage | Reduces power loss in current-setting resistor by >80% vs. conventional 1.25V references - improves efficiency especially at high LED currents. |
| Adjustable 200kHz–2.5MHz switching frequency | Allows optimization between inductor size (smaller at high fSW) and efficiency (higher at low fSW) - supports compact designs without sacrificing thermal performance. |
| Thermal shutdown at 150°C | Protects IC under sustained overload or poor PCB thermal design; auto-recovery when die temperature falls below 150°C - avoids permanent latch-off. |
Applications
| Notebook PC Display | LED Camera Light for Cell Phones |
|---|---|
|
Use Scenario: Driving dual 8-LED strings for high-brightness, uniform 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 display zone and open-circuit fault containment. Use Value: Enables thin form factor (no external inductors >10µH), extends battery life via 200mV FB efficiency gain, and ensures display uniformity via series-connected LEDs with matched current. |
Use Scenario: Powering high-intensity flash LED array in smartphone rear cameras requiring rapid burst illumination and smooth video-mode dimming. IC Role / Device Role / Timing Role: Dual-channel LED driver supporting simultaneous flash (high-current pulsed mode) and movie light (low-current continuous dimming) via CTRL/PWM co-control. Use Value: Delivers 320mA flash current (per string) from 3.6V supply while maintaining 1000:1 dimming ratio for video - eliminates need for separate flash/video drivers. |
| Car Dashboard Lighting | Avionics Displays |
|
Use Scenario: Illuminating segmented instrument clusters and TFT displays in automotive cockpits with wide input voltage (9–16V) and AEC-Q200 stress tolerance. IC Role / Device Role / Timing Role: Dual boost regulator delivering stable LED current despite battery transients (load dump, cold crank), with thermal shutdown for under-hood reliability. Use Value: Operates across full automotive temperature range (–40°C to +85°C), withstands 25V absolute max input, and provides open-circuit detection to prevent dashboard blackouts during LED failure. |
Use Scenario: Backlighting critical flight-deck LCDs where reliability, EMI control, and fault isolation are mandatory per DO-160/ED-14 standards. IC Role / Device Role / Timing Role: Redundant LED driver with independent channel shutdown - single-point failure in one string does not affect second string's operation. Use Value: Exposed-pad DFN package enables robust thermal management in sealed avionics enclosures; 36V OVP clamp meets lightning-induced surge immunity requirements. |
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#PBF | Charge-pump topology (not inductive boost); max 36V output; 100mA per channel; no RT-programmable frequency. | Suitable for low-noise, low-EMI applications where inductor size/EMI is prohibitive; cannot drive 8-LED strings from Li-Ion due to lower voltage gain. | Select LTC3260EMS#PBF only when inductor-free operation and <100mA/channel are acceptable - not a drop-in replacement for LT3486EDHC#PBF's 1.3A/25mA capability. |
| TPS68400RHDR | Single-channel, 1.5A boost; integrated MOSFET; 2.7–5.5V input; 1000:1 PWM dimming; no open-LED clamp. | Requires two units for dual-string operation; lacks 36V OVP protection and independent CTRL/PWM per channel. | Choose TPS68400RHDR for cost-sensitive single-string designs with tight board space; use two units only if dual independent control is not required and OVP can be added externally. |
Compared with LTC3260EMS#PBF and TPS68400RHDR, LT3486EDHC#PBF uniquely combines dual 1.3A inductive boost channels, 36V open-LED protection, and independent analog+PWM dimming in a thermally optimized DFN - making it the only solution capable of driving 16 LEDs from a single Li-Ion cell with full fault coverage.
Availability
LT3486EDHC#PBF is available at Aetrix Electronics and suitable for notebook display backlighting, smartphone camera flash modules, and automotive dashboard lighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.
Supply support for LT3486EDHC#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. (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 LT3486 product line was developed specifically for high-efficiency, dual-channel white LED backlight and flash applications in portable electronics - emphasizing precision current matching, wide dimming range, and robust fault protection in minimal footprint packages.
FAQ
What is the maximum number of white LEDs the LT3486EDHC#PBF can drive?
The LT3486EDHC#PBF can drive up to 16 white LEDs total - 8 LEDs in series per channel - from a single Li-Ion cell (3.0–4.2V) at 25mA per string, or up to 100mA per string when supplied from 12V. Its 36V OVP clamp and 1.3A switch current ensure safe operation even with forward voltage variations across LED batches.
Does the LT3486EDHC#PBF support independent dimming of each LED string?
Yes, the LT3486EDHC#PBF supports fully independent dimming via two dedicated control paths per channel: CTRL pins enable analog dimming (0–1.8V linearly scales LED current), while PWM1/PWM2 pins accept digital signals for 1000:1 resolution without color shift. This allows asymmetric brightness tuning - essential for multi-zone displays and camera flash/movie light modes.
What package type and thermal characteristics does the LT3486EDHC#PBF use?
The LT3486EDHC#PBF uses a 16-pin (5mm × 3mm) plastic DFN package with exposed thermal pad (Pin 17). Its thermal resistance is θJA = 43°C/W and θJC = 4°C/W when the exposed pad is soldered to a solid PCB ground plane - enabling reliable operation at full load in compact handheld and automotive environments.
How does the LT3486EDHC#PBF protect against LED string open-circuit failures?
The LT3486EDHC#PBF monitors output voltage via OVP1 and OVP2 pins. If an LED string opens, the internal detector clamps output to 36V (typical) by disabling the respective switch and pulling its VC pin low. The affected channel then switches at very low frequency to minimize input current, while the other channel continues normal operation - ensuring partial system functionality.
Can the LT3486EDHC#PBF operate from a 12V supply, and what are the key considerations?
Yes, the LT3486EDHC#PBF operates from 2.5V to 24V input, including 12V supplies. At 12V, it can deliver up to 100mA per LED string (8 LEDs). Key considerations include selecting inductors rated for higher DC current (≥1.5A), verifying diode reverse voltage rating ≥36V, and ensuring thermal design accommodates higher power dissipation - especially at high dimming ratios and ambient temperatures.
LT3486EDHC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN 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 ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x3)
LT3486EDHC#PBF FAQ
1.How can I place an order for LT3486EDHC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3486EDHC#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 LT3486EDHC#PBF reliable?
The price and inventory of LT3486EDHC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3486EDHC#PBF is usually 5 days.
3.What payment methods are accepted for LT3486EDHC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3486EDHC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3486EDHC#PBF?
LT3486EDHC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3486EDHC#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 LT3486EDHC#PBF?
For technical support, including LT3486EDHC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3486EDHC#PBF requirements.
6.How does Aetrix verify that LT3486EDHC#PBF is sourced from the original manufacturer or authorized distributors?
All LT3486EDHC#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 LT3486EDHC#PBF meets industry standards.
7.What is the process for return or replacement of LT3486EDHC#PBF?
All LT3486EDHC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3486EDHC#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 LT3486EDHC#PBF part is unused and in its original packaging.
Return procedure for LT3486EDHC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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