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Analog Devices Inc. LT3492IUFD#PBF
- Part No.:
- LT3492IUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3492IUFD#PBF.pdf
- Description:
- IC LED DRV RGLTR PWM 600MA 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,963
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Product details
Overview
LT3492IUFD#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 per channel. It delivers true-color PWM dimming up to 3000:1 at 100Hz, supports 3V–30V input, and features independent CTRL pins for analog current adjustment and overtemperature protection - ideal for RGB backlighting in automotive instrument clusters.
For engineers reviewing the LT3492IUFD#PBF datasheet, LT3492IUFD#PBF pinout, LT3492IUFD#PBF application, or LT3492IUFD#PBF equivalent, key selection criteria include its 28-pin QFN (4mm × 5mm) package, 330kHz–2.1MHz adjustable switching frequency, built-in PMOS gate drivers for LED disconnect, open-LED protection on all three channels, and ±2% LED current regulation accuracy across –40°C to 125°C.
Technical Context
The LT3492IUFD#PBF employs fixed-frequency current-mode control with shared oscillator, ramp generator, and reference circuitry across three replicated converter channels. Each channel integrates a 600mA NPN switch, independent PWM input, and dedicated VC compensation node for stable loop response.
Its architecture enables simultaneous operation in mixed topologies (e.g., buck for red, boost for blue/green), with CTRL pins setting LED current sense threshold from 10mV to 100mV and FADJ pin programming switching frequency via analog voltage (0.1V–1.5V). Open-LED protection uses 1V OVP comparators tied to external resistor dividers on each output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 30V continuous; withstands 40V transients - supports wide-range automotive battery inputs without external clamping. |
| Switch Rating | 600mA max per channel, 60V collector-emitter rating - drives strings up to 10 LEDs in boost mode at 30V input. |
| PWM Dimming Ratio | 3000:1 at 100Hz - enables precise grayscale control in high-end signage and avionic displays. |
| Switching Frequency | 330kHz to 2.1MHz (FADJ-programmable) - allows trade-off between efficiency (low fSW) and component size (high fSW). |
| LED Current Accuracy | ±2% over temperature and line - ensures consistent brightness across RGB channels without calibration. |
| CTRL Pin Range | 10mV–100mV sense threshold - sets LED current from 33mA to 330mA with 330mΩ sense resistor. |
| OVP Threshold | 1.0V ±5% - triggers shutdown when LED string opens, protecting downstream components. |
Pinout & Package
LT3492IUFD#PBF 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 PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies internal bias circuits; must be bypassed with ≥1μF ceramic capacitor near pin. |
| SHDN | Global shutdown control | Logic-high (>1.5V) enables all three converters; logic-low (<0.4V) reduces quiescent current to 0.1μA. |
| PWM1–PWM3 | Per-channel dimming enable | Active-high signals that gate LED current and disconnect external PMOS; low state places VC pin in high-Z mode. |
| CTRL1–CTRL3 | Current sense threshold adjust | Sets ISP–ISN voltage: ≤1V → 1/10×CTRL value; >1V → fixed 100mV - enables analog dimming or thermal foldback. |
| ISP1–ISP3 / ISN1–ISN3 | Differential current sense inputs | Connect across external sense resistor; reject common-mode noise for accurate current regulation. |
| TG1–TG3 | PMOS gate driver output | Drives external P-channel MOSFET gate; limits ISP–TG voltage to 6.5V to prevent gate overvoltage. |
| OVP1–OVP3 | Open-LED protection input | Monitors output voltage via resistor divider; >1V disables respective switch to prevent overvoltage failure. |
| FADJ | Frequency adjustment | Analog input (0.1V–1.5V) sets switching frequency from 330kHz to 2.1MHz - optimizes efficiency vs. size. |
| VREF | 2.0V precision reference | Stable 2V output sourcing up to 200μA - used for biasing CTRL dividers or external circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent LED drivers | Three fully isolated current-regulated channels with separate PWM, CTRL, and OVP pins - eliminates crosstalk in multi-color systems. |
| True Color PWM™ dimming | 3000:1 ratio with linear light output vs. duty cycle - preserves color fidelity during dimming without flicker or color shift. |
| Built-in PMOS gate drivers | Integrated TG outputs drive external P-MOSFETs to disconnect LED strings during PWM off-time - prevents leakage-induced glow. |
| Adjustable switching frequency | 330kHz–2.1MHz range via single FADJ pin - enables optimization for EMI, efficiency, or compact layout using small inductors/caps. |
| Open-LED fault protection | Dedicated OVP pins per channel shut down only the affected converter - maintains operation of remaining channels during partial failure. |
Applications
| Automotive Instrument Clusters | RGB Backlighting for Medical Displays |
|---|---|
|
Use Scenario: Driving red/green/blue LED strings behind TFT LCDs in vehicle dashboards with ambient temperature ranging from –40°C to 105°C. IC Role / Device Role / Timing Role: Constant-current source regulating 60mA per channel with synchronized PWM dimming to match display frame rate. Use Value: Maintains color balance and brightness uniformity across temperature extremes while meeting automotive EMC requirements via programmable 1.3MHz switching. |
Use Scenario: Powering high-CRI RGB LED arrays in surgical monitors requiring flicker-free dimming down to 0.03% brightness. IC Role / Device Role / Timing Role: Triple-channel current controller with independent CTRL pins enabling analog + PWM hybrid dimming for smooth low-level transitions. Use Value: Achieves 3000:1 dimming without color shift - critical for accurate tissue visualization under variable lighting conditions. |
| Avionic Cabin Lighting | Large-Scale Outdoor Billboards |
|
Use Scenario: Controlling multi-zone white+amber LED modules in aircraft cabin lighting with DALI-compatible dimming interface. IC Role / Device Role / Timing Role: Buck-boost LED driver supporting 12V–28V input and 20–48V LED string voltages across all zones. Use Value: Single-chip solution replaces three discrete drivers - reduces BOM count, improves reliability, and meets DO-160 lightning surge immunity via 40V transient tolerance. |
Use Scenario: Driving high-brightness RGB pixel modules in 10m×5m digital billboards exposed to outdoor temperature cycling and humidity. IC Role / Device Role / Timing Role: Robust triple-output driver with open-LED protection ensuring fail-safe operation of individual pixels without system-wide shutdown. Use Value: Enables hot-swap maintenance of failed LED modules while maintaining full display functionality - minimizing downtime and service cost. |
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 |
|---|---|---|---|
| MAX20052ATP+T | Single-channel 2.2MHz buck LED driver with I²C interface; no integrated PMOS drivers or 3000:1 PWM. | Requires external controllers for multi-channel sync; lacks analog dimming via CTRL pin. | Choose for I²C-configurable systems needing higher integration but accepting reduced dimming ratio and added MCU overhead. |
| TPS61165DRVR | Dual-channel boost LED driver with 1.2MHz fSW; no buck/buck-boost support, no OVP per channel, max 40V switch rating. | Limited to boost-only topologies; no independent shutdown per channel. | Prefer for cost-sensitive dual-channel boost designs where 3000:1 dimming and open-LED protection are not required. |
Compared with MAX20052ATP+T and TPS61165DRVR, the LT3492IUFD#PBF uniquely combines triple independent channels, 3000:1 True Color PWM, buck/boost/buck-boost flexibility, and per-channel OVP - making it the only option for high-reliability, multi-topology RGB LED systems demanding full fault isolation and ultra-deep dimming.
Availability
LT3492IUFD#PBF is available at Aetrix Electronics and suitable for automotive instrument clusters, avionic cabin lighting, and large-format RGB billboards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3492IUFD#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 full product support, datasheets, and design tools for the LT3492 family.
The LT3492IUFD#PBF belongs to Linear's high-performance LED driver product line, engineered specifically for multi-channel, high-dimming-ratio lighting in automotive, aerospace, and medical imaging applications.
FAQ
What is the maximum LED string voltage supported by LT3492IUFD#PBF in boost mode?
The LT3492IUFD#PBF supports up to 60V at the ISP pins, enabling boost configurations driving 10–12 white LEDs (3.2V each) from a 12V input. Its 60V-rated internal NPN switch and external Schottky diode selection (e.g., B1100, 100V VR) ensure safe operation at full output voltage swing. Always verify peak inductor current and thermal derating at maximum VOUT × ILED.
Can LT3492IUFD#PBF operate in buck mode with 3.3V input and 2.5V LED string?
Yes - the LT3492IUFD#PBF supports buck operation down to 3V input and can regulate LED current with output voltages below VIN. At 3.3V input and 2.5V LED string, the device achieves >90% efficiency using a 33μH inductor and 0.22μF output capacitor per channel, as validated in the "Minimum BOM Buck Mode LED Driver" typical application (Figure TA07a).
How does the CTRL pin function for overtemperature protection in LT3492IUFD#PBF?
The CTRL pin in LT3492IUFD#PBF accepts an external voltage to set LED current sense threshold. When paired with a PTC thermistor (e.g., 470Ω + 50kΩ divider to VREF), rising temperature increases CTRL voltage above 1V, forcing the current sense threshold to 100mV and reducing LED current - providing automatic thermal foldback without external monitoring circuitry.
Is LT3492IUFD#PBF pin-compatible with LT3492EUFD#PBF?
Yes - both LT3492IUFD#PBF and LT3492EUFD#PBF use identical 28-lead (4mm × 5mm) QFN packages with identical pinout, electrical specifications, and thermal characteristics. The only difference is temperature grade: IUFD is rated for –40°C to 125°C junction, while EUFD is rated for 0°C to 125°C. No PCB changes are required for substitution.
What external components are mandatory for basic LT3492IUFD#PBF operation?
Mandatory components for LT3492IUFD#PBF include: (1) 1μF ceramic input capacitor at VIN, (2) three external sense resistors (e.g., 330mΩ) between ISP/ISN per channel, (3) three inductors (e.g., 33μH for buck), (4) three Schottky diodes (e.g., B1100), and (5) three output capacitors (0.22μF for buck, 1μF for boost). The VREF pin may be left unconnected if unused.
LT3492IUFD#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)
LT3492IUFD#PBF FAQ
1.How can I place an order for LT3492IUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3492IUFD#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 LT3492IUFD#PBF reliable?
The price and inventory of LT3492IUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3492IUFD#PBF is usually 5 days.
3.What payment methods are accepted for LT3492IUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3492IUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3492IUFD#PBF?
LT3492IUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3492IUFD#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 LT3492IUFD#PBF?
For technical support, including LT3492IUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3492IUFD#PBF requirements.
6.How does Aetrix verify that LT3492IUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3492IUFD#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 LT3492IUFD#PBF meets industry standards.
7.What is the process for return or replacement of LT3492IUFD#PBF?
All LT3492IUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3492IUFD#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 LT3492IUFD#PBF part is unused and in its original packaging.
Return procedure for LT3492IUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3492IUFD#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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