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Analog Devices Inc. LT3492EUFD#TRPBF
- Part No.:
- LT3492EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3492EUFD#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 600MA 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,539
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Product details
Overview
LT3492EUFD#TRPBF 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#TRPBF datasheet, LT3492EUFD#TRPBF pinout, LT3492EUFD#TRPBF application, or LT3492EUFD#TRPBF equivalent, key selection criteria include per-channel current sense threshold control (10mV–100mV), open-LED protection on all three outputs, thermal shutdown via CTRL pin, and QFN-28 (4mm × 5mm) package compatibility with high-density PCB layouts.
Technical Context
The LT3492EUFD#TRPBF implements fixed-frequency current-mode control across three independent channels, each with dedicated error amplifiers (VC1–VC3), PWM comparators, and NPN power switches. Its architecture enables stable regulation over wide VIN (3V–30V) and VOUT ranges while supporting mixed-mode operation-e.g., one channel in buck, another in boost-via external component configuration.
Each channel integrates a gate driver (TG1–TG3) for external P-channel MOSFETs to enable true-color PWM dimming with minimal leakage during off-state, and uses ISP/ISN differential sensing with programmable current threshold via CTRL pins (10mV–100mV). Open-LED protection is implemented per channel using OVP1–OVP3 inputs referenced to a 1V internal comparator.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 30V continuous; transient-rated to 40V - enables direct connection to automotive battery rails without pre-regulation. |
| Switch Current Limit | 600mA typical per channel - sets maximum LED drive capability and defines inductor sizing constraints. |
| PWM Dimming Ratio | 3000:1 at 100Hz - ensures flicker-free, high-fidelity color mixing in RGB signage and avionic displays. |
| Switching Frequency Range | 330kHz to 2.1MHz via FADJ pin - allows trade-off between efficiency (lower fSW) and solution size (higher fSW). |
| Current Sense Threshold | Programmable 10mV–100mV via CTRL1–CTRL3 - enables precise analog dimming and overtemperature protection using PTC networks. |
| Output Voltage Capability | Up to 60V at ISP/ISN pins - supports long LED strings (e.g., 10–12 white LEDs in series) in boost mode. |
| Operating Temperature | –40°C to +125°C junction - qualified for under-hood automotive and industrial ambient environments. |
Pinout & Package
LT3492EUFD#TRPBF is housed in a 28-lead (4mm × 5mm) plastic QFN package with exposed thermal pad (Pin 29 = GND). The package supports high-power dissipation (θJC = 2.7°C/W) and requires soldering of the exposed pad to a PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies internal bias circuits and switch drivers; must be bypassed with ≥1μF low-ESR ceramic 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 control both LED current flow and VC pin impedance state for linear dimming retention. |
| CTRL1–CTRL3 | Current sense threshold setting | Configures LED current sense voltage (10mV–100mV); <1V input yields 1/10× scaling for fine analog control. |
| ISP1–ISP3 / ISN1–ISN3 | Differential current sense inputs | Connect across external sense resistor; reject common-mode noise and enable accurate constant-current regulation. |
| TG1–TG3 | P-channel MOSFET gate driver output | Drives external PMOS disconnect switch; limits ISP–TG voltage to 6.5V to protect MOSFET gate oxide. |
| OVP1–OVP3 | Open-LED fault detection input | Monitors output voltage via resistor divider; >1V triggers automatic shutdown of respective channel only. |
| FADJ | Frequency adjustment input | Voltage-controlled oscillator input; 0.1V–1.5V sets switching frequency from 330kHz to 2.1MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent LED drivers | Three fully isolated current-regulated channels with separate PWM, CTRL, OVP, and compensation pins - enables mixed topology (buck/boost/buck-boost) per channel. |
| True Color PWM™ dimming | 3000:1 dimming ratio with no color shift - achieved by synchronous PWM gating of external PMOS + stored VC voltage retention during off-cycle. |
| Integrated 600mA/60V NPN switches | Eliminates need for external high-voltage switches in most LED string configurations - reduces BOM count and layout complexity. |
| Per-channel open-LED protection | OVP1–OVP3 inputs independently disable faulty channels while others remain operational - improves system-level reliability in multi-string arrays. |
| Adjustable frequency with soft-start | FADJ pin supports RC-filtered ramp-up for controlled start-up - prevents inrush current and stabilizes initial regulation before full load engagement. |
Applications
| Automotive Interior Lighting | RGB Video Billboards |
|---|---|
Use Scenario: Driving multi-color LED modules in dashboard backlighting and ambient lighting systems requiring precise white-point stability and EMI compliance. IC Role / Device Role / Timing Role: Constant-current source with synchronized PWM dimming across R/G/B channels to maintain chromaticity during brightness transitions. Use Value: 3000:1 dimming range enables seamless transition from daylight-readable to night-driving modes without color distortion or audible noise. |
Use Scenario: Powering high-brightness pixel clusters in outdoor digital signage where thermal management and long-string voltage headroom are critical. IC Role / Device Role / Timing Role: Triple-channel boost-mode LED driver delivering 100mA per string to 12-LED series chains at up to 60V output. Use Value: 60V ISP/ISN rating and 30V input support direct integration with 24V industrial power rails, reducing need for intermediate DC/DC stages. |
| Avionic Display Backlighting | Industrial Control Panel Indicators |
Use Scenario: Providing fault-tolerant backlighting for cockpit LCDs where single-point failure must not compromise overall display visibility. IC Role / Device Role / Timing Role: Redundant triple-output driver with per-channel OVP and thermal foldback - isolates faults to individual LED strings. Use Value: Independent OVP1–OVP3 inputs ensure continued operation of two channels if one LED string opens, meeting DO-160 lightning surge and reliability requirements. |
Use Scenario: Driving status indicators and segmented bar-graph displays in factory HMIs subject to wide temperature swings and vibration. IC Role / Device Role / Timing Role: Buck-mode constant-current source with analog dimming via CTRL pins for adaptive brightness control based on ambient light sensors. Use Value: –40°C to +125°C operating range and undervoltage lockout (2.1V) guarantee reliable startup and operation in unregulated industrial power environments. |
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#TRPBF | Single-channel, 1.5A switch, 50V max; no integrated PMOS gate driver; 1000:1 PWM dimming | Suitable only for single-string designs; lacks per-channel OVP and TG outputs | Select when cost-sensitive single-output applications require higher current per channel but do not need multi-string isolation. |
| LM3409QMYX/NOPB | Single-channel, 1.25A switch, 75V max; analog/digital dimming; no integrated gate driver for PMOS disconnect | Requires external MOSFET for high-ratio PWM; no per-channel OVP or multi-topology flexibility | Prefer for high-voltage boost-only LED strings where thermal performance at 125°C is prioritized over channel independence. |
Compared with LT3492EUFD#TRPBF, LT3466EFE#TRPBF offers higher per-channel current but sacrifices channel independence and dimming fidelity, while LM3409QMYX/NOPB provides greater voltage headroom but requires additional components to achieve comparable fault coverage and dimming linearity.
Availability
LT3492EUFD#TRPBF is available at Aetrix Electronics and suitable for automotive interior lighting, RGB video billboards, avionic display backlighting, and industrial control panel indicators requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT3492EUFD#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 and maintains full technical and manufacturing continuity for the LT® product family, including precision analog, power management, and signal conditioning ICs.
The LT3492EUFD#TRPBF belongs to Linear's high-performance LED driver product line, designed specifically for multi-channel, high-dimming-ratio applications in automotive, aerospace, and industrial displays where color accuracy and fault resilience are critical.
FAQ
What is the maximum LED string voltage supported by LT3492EUFD#TRPBF?
The LT3492EUFD#TRPBF supports up to 60V at its ISP/ISN pins, enabling driving of long LED strings-e.g., 12 white LEDs (3.2V each) in series at ~38.4V-or operation in boost mode with 24V input to 60V output. This rating is validated across the full –40°C to +125°C operating range and includes margin for transients.
Does LT3492EUFD#TRPBF require external PMOS transistors for PWM dimming?
Yes, LT3492EUFD#TRPBF requires external P-channel MOSFETs connected to TG1–TG3 pins to achieve its full 3000:1 PWM dimming capability. The internal gate drivers limit ISP–TG voltage to 6.5V for safe MOSFET turn-on; recommended devices include ZXMP6A13F (QG < 6nC) for optimal dimming linearity and speed.
How does open-LED protection work on LT3492EUFD#TRPBF?
Each channel of LT3492EUFD#TRPBF has a dedicated OVP1–OVP3 pin that monitors output voltage via an external resistor divider. When voltage exceeds 1V (indicating open-circuit LED failure), the corresponding internal switch shuts off while other channels continue normal operation-ensuring partial system functionality remains intact.
Can LT3492EUFD#TRPBF operate in buck, boost, and buck-boost modes simultaneously?
Yes, LT3492EUFD#TRPBF supports independent topology selection per channel. Channel 1 may be configured as buck, Channel 2 as boost, and Channel 3 as buck-boost-enabled by separate external component sets (inductors, diodes, capacitors) and shared internal control resources like the oscillator and reference.
What is the role of the CTRL pin in LT3492EUFD#TRPBF current programming?
The CTRL pin on LT3492EUFD#TRPBF sets the LED current sense threshold: if CTRL voltage is ≤1V, the effective threshold is 1/10× that value (e.g., 0.1V → 10mV); if >1V, it defaults to 100mV. This enables precise analog dimming and overtemperature protection when paired with a PTC thermistor network on CTRL1–CTRL3.
LT3492EUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT3492EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3492EUFD#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 LT3492EUFD#TRPBF reliable?
The price and inventory of LT3492EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3492EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3492EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3492EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3492EUFD#TRPBF?
LT3492EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3492EUFD#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 LT3492EUFD#TRPBF?
For technical support, including LT3492EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3492EUFD#TRPBF requirements.
6.How does Aetrix verify that LT3492EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3492EUFD#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 LT3492EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3492EUFD#TRPBF?
All LT3492EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3492EUFD#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 LT3492EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LT3492EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3492EUFD#TRPBF 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
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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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