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Analog Devices Inc. LT3492EUFD#PBF
- Part No.:
- LT3492EUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3492EUFD#PBF.pdf
- Description:
- IC LED DRV RGLTR PWM 600MA 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,078
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Product details
Overview
LT3492EUFD#PBF from Analog Devices (formerly Linear Technology) is a triple-output, constant-current DC/DC LED driver IC operating in buck, boost, or buck-boost topology with integrated 600mA/60V NPN switches and PMOS gate drivers. It delivers up to 3000:1 PWM dimming per channel at 100Hz, supports 3V–30V input, and features adjustable switching frequency (330kHz–2.1MHz) for RGB lighting and automotive display backlighting.
For engineers reviewing the LT3492EUFD#PBF datasheet, LT3492EUFD#PBF pinout, LT3492EUFD#PBF application, or LT3492EUFD#PBF equivalent, key selection criteria include per-channel current sense threshold programmability (10mV–100mV), open-LED protection on all three outputs, independent PWM control inputs, thermal shutdown via CTRL pin biasing, and QFN-28 (4mm × 5mm) package compatibility with high-density PCB layouts.
Technical Context
The LT3492EUFD#PBF implements fixed-frequency current-mode control across three fully independent channels, each with dedicated SW, ISP/ISN, TG, PWM, CTRL, VC, and OVP pins. Its architecture replicates core regulation circuitry-including error amplifier A1, PWM comparator A2, SR latch A3, and NPN switch Q1-per channel while sharing oscillator, ramp generator, VREF, and UVLO blocks.
Each channel regulates LED current by comparing sensed voltage across an external resistor to a precision threshold set by the CTRL pin (10mV–100mV range), with gate drive for external P-channel MOSFETs enabling true-color PWM dimming. Open-LED protection operates independently per channel via OVP pins referenced to a 1V internal comparator threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 30V continuous operation; transient rated to 40V for ≤1 second - enables direct connection to automotive battery rails without pre-regulation. |
| Switch Current Limit | 600mA typical per channel (1000mA max) - sets maximum LED string current and defines inductor sizing constraints. |
| PWM Dimming Ratio | 3000:1 at 100Hz - achieves high-fidelity grayscale control in signage and avionics displays without color shift. |
| Switching Frequency Range | 330kHz to 2.1MHz (via FADJ pin) - allows trade-off between efficiency (lower fSW) and component size (higher fSW). |
| Current Sense Threshold | Programmable from 10mV to 100mV via CTRL pin - enables precise LED current setting from ~30mA to 1A using standard sense resistors. |
| Operating Temperature | –40°C to +125°C junction - qualified for under-hood automotive and industrial ambient environments. |
| Package | 28-lead (4mm × 5mm) plastic QFN with exposed pad - provides low thermal resistance (θJC = 2.7°C/W) and compact footprint for multi-channel LED systems. |
Pinout & Package
LT3492EUFD#PBF uses a 28-lead (4mm × 5mm) plastic QFN package with exposed thermal pad (Pin 29) soldered to PCB ground plane. Pin numbering follows top-view layout with Pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies internal bias circuits and switch drivers; requires local 1μF ceramic bypass capacitor. |
| SHDN | Global shutdown control | Logic-high (>1.5V) enables all three channels; logic-low (<0.4V) reduces quiescent current to <10μA. |
| PWM1–PWM3 | Per-channel dimming enable | Active-high signals that disable respective converter and disconnect LED string via TG output when low. |
| CTRL1–CTRL3 | Current sense threshold reference | Sets LED current sense voltage (10mV–100mV); must not be left floating; supports analog dimming and overtemperature protection. |
| ISP1–ISP3 / ISN1–ISN3 | Differential current sense inputs | Connect across external sense resistor; high-impedance inputs (≤1μA bias) ensure minimal measurement error. |
| TG1–TG3 | PMOS gate driver output | Drives external P-channel MOSFET gate; limits ISP–TG voltage to 6.5V to protect MOSFET gate oxide. |
| OVP1–OVP3 | Open-LED fault detection | Comparator input referenced to 1V internal threshold; >1V disables respective channel's main switch. |
| VREF | 2.0V precision reference output | Stable 2V source capable of sourcing 200μA; used for biasing CTRL pins or external circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent LED driver channels | Enables simultaneous control of RGB or multi-zone white LED strings without cross-channel interference or shared timing constraints. |
| True Color PWM™ dimming | Maintains consistent LED spectral output across full 3000:1 intensity range by preserving constant current during PWM on-time. |
| Built-in PMOS gate driver per channel | Eliminates need for external level-shifting circuitry when disconnecting LED strings during PWM off-time. |
| Adjustable switching frequency (330kHz–2.1MHz) | Allows optimization of inductor size, efficiency, and EMI profile without changing compensation network. |
| Open-LED protection per channel | Prevents overvoltage damage to LEDs and driver during string failure while allowing remaining channels to operate normally. |
| Wide input voltage range (3V–30V) | Supports direct integration into 12V/24V automotive, industrial, and signage power architectures without intermediate regulators. |
Applications
| Automotive Interior Lighting | RGB Backlighting for Large Displays |
|---|---|
|
Use Scenario: Illuminating instrument clusters, ambient footwell lighting, and center console controls in vehicles with 12V/24V battery supply. IC Role / Device Role / Timing Role: Constant-current regulator delivering stable 600mA per channel to red/green/blue LED strings with synchronized PWM dimming. Use Value: Enables seamless color mixing and dynamic mood lighting with 3000:1 contrast ratio and thermal derating via CTRL pin feedback. |
Use Scenario: Driving high-brightness LED arrays behind outdoor digital billboards and transportation information panels. IC Role / Device Role / Timing Role: Triple-output buck-boost controller powering parallel LED strings requiring 30–58V output from 12V input. Use Value: Delivers robust operation across wide temperature range (–40°C to +125°C) with open-LED fault isolation preventing total display blackout. |
| Avionic Cabin Lighting | Architectural LED Signage |
|
Use Scenario: Providing certified emergency and general cabin lighting in commercial aircraft with strict EMI and reliability requirements. IC Role / Device Role / Timing Role: High-reliability LED driver with independent channel monitoring, undervoltage lockout, and thermal foldback. Use Value: Meets DO-160 lightning surge immunity via 40V transient rating and ensures fail-safe operation with per-channel OVP and shutdown sequencing. |
Use Scenario: Powering decorative linear LED strips and contour lighting in retail and hospitality environments. IC Role / Device Role / Timing Role: Compact triple-channel driver enabling independent dimming zones within single PCB footprint. Use Value: Reduces BOM count by integrating three drivers in 4mm × 5mm QFN, supporting 3000:1 dimming without external DACs or microcontrollers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3466EFE#PBF | Single-channel, 1.5A switch, no integrated PMOS gate driver, fixed 1.2MHz fSW | Lacks multi-channel synchronization and true-color PWM; requires external MOSFET for LED disconnect | Select when only one high-current LED string is needed and board space permits discrete gate drive components. |
| MAX16820ATL+T | Triple-channel, 500mA switches, 2.2MHz max fSW, no OVP per channel, 2.7V–28V VIN | Lower current capability and missing per-channel open-LED protection reduce fault tolerance in critical lighting systems | Consider for cost-sensitive consumer signage where full 3000:1 dimming and automotive-grade reliability are not required. |
Compared with LT3492EUFD#PBF, LT3466EFE#PBF offers higher per-channel current but lacks integrated PMOS drivers and multi-channel coordination, while MAX16820ATL+T provides similar channel count but sacrifices open-LED protection and thermal management robustness - making LT3492EUFD#PBF optimal for safety-critical, high-dynamic-range LED systems.
Availability
LT3492EUFD#PBF is available at Aetrix Electronics and suitable for automotive interior lighting, RGB display backlighting, avionic cabin illumination, and architectural LED signage requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3492EUFD#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 acquired Linear Technology in 2017 and maintains its legacy of high-performance analog and power management ICs targeting demanding industrial, automotive, and aerospace applications.
The LT3492 product line was designed specifically for high-reliability, multi-channel LED lighting systems requiring precise current regulation, wide dimming range, and fault-tolerant operation in harsh environments.
FAQ
What is the maximum LED string voltage supported by LT3492EUFD#PBF in boost mode?
The LT3492EUFD#PBF supports up to 60V at its ISP pins, enabling LED strings with forward voltages up to approximately 58V in boost configuration. This is validated by absolute maximum ratings for ISP1–ISP3 (60V) and typical application circuits driving 10–12 LEDs at 100mA with 12V input. Operation above 58V risks exceeding safe operating area limits under worst-case thermal conditions.
Can LT3492EUFD#PBF operate in buck-boost mode with a single inductor per channel?
Yes, LT3492EUFD#PBF supports buck-boost operation using a single inductor per channel, as confirmed by the block diagram and application note Figure 1. The device's current-mode architecture and independent SW/ISP/ISN pinning allow SEPIC or inverting buck-boost configurations. External component selection (e.g., coupling capacitor value) must follow equations in the Applications Information section to maintain stability and current accuracy.
How does the CTRL pin affect LED current accuracy across temperature?
The CTRL pin sets the current sense threshold with ±2% variation over –40°C to +125°C, as specified in the Electrical Characteristics table. At 25°C, full-scale sense voltage is 98–104mV; at extremes, it shifts to 96–103mV. This translates to ≤±3% LED current drift across temperature when using a stable sense resistor, enabling reliable brightness consistency in automotive and outdoor lighting.
Is LT3492EUFD#PBF pin-compatible with other LT3492 variants like LT3492EFE#PBF?
No, LT3492EUFD#PBF (QFN-28) is not pin-compatible with LT3492EFE#PBF (TSSOP-28). While both share identical electrical functionality and signal naming, their pinouts differ significantly - e.g., TG1–TG3 occupy Pins 1–3 in UFD but Pins 26–28 in FE. PCB layout and routing must be redesigned when substituting between packages.
What thermal design practices are required for LT3492EUFD#PBF at full load?
LT3492EUFD#PBF requires soldering its exposed thermal pad (Pin 29) directly to a solid PCB ground plane with ≥4 thermal vias (0.3mm diameter) connecting to inner ground layers. With θJC = 2.7°C/W, maintaining junction temperature ≤125°C at 600mA/channel and 30V input demands ≥2 cm² copper area and airflow ≥200 LFM. Thermal simulation using the provided θJA = 34°C/W is recommended for enclosure-level validation.
LT3492EUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- SEPIC, Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 3
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 30V
- Voltage - Output:
- -
- Current - Output / Channel:
- 600mA (Switch)
- Frequency:
- 330kHz ~ 2.1MHz
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LT3492EUFD#PBF FAQ
1.How can I place an order for LT3492EUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3492EUFD#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 LT3492EUFD#PBF reliable?
The price and inventory of LT3492EUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3492EUFD#PBF is usually 5 days.
3.What payment methods are accepted for LT3492EUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3492EUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3492EUFD#PBF?
LT3492EUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3492EUFD#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 LT3492EUFD#PBF?
For technical support, including LT3492EUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3492EUFD#PBF requirements.
6.How does Aetrix verify that LT3492EUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3492EUFD#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 LT3492EUFD#PBF meets industry standards.
7.What is the process for return or replacement of LT3492EUFD#PBF?
All LT3492EUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3492EUFD#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 LT3492EUFD#PBF part is unused and in its original packaging.
Return procedure for LT3492EUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3492EUFD#PBF Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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