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Analog Devices Inc. LT3492IUFD#TRPBF
- Part No.:
- LT3492IUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3492IUFD#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 600MA 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,207
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Product details
Overview
LT3492IUFD#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 ratio per channel at 100Hz, supports 3V–30V input, and features adjustable switching frequency from 330kHz to 2.1MHz. It is used in high-fidelity RGB lighting systems requiring precise multi-channel current regulation.
For engineers reviewing the LT3492IUFD#TRPBF datasheet, LT3492IUFD#TRPBF pinout, LT3492IUFD#TRPBF application, or LT3492IUFD#TRPBF equivalent, key selection criteria include per-channel 600mA switch rating, 3000:1 true-color PWM dimming capability, independent CTRL-pin-based analog current programming (10mV–100mV sense threshold), open-LED protection on all three channels, and QFN-28 (4mm × 5mm) thermal-performance packaging.
Technical Context
The LT3492IUFD#TRPBF implements fixed-frequency current-mode control with three fully independent converter channels sharing only oscillator, reference, and bias circuitry. Each channel integrates a 600mA/60V NPN power switch, dedicated error amplifier (VCx), current-sense inputs (ISPx/ISNx), PWM input, and PMOS gate driver (TGx) for LED-disconnect functionality.
Switching frequency is set via FADJ pin voltage (330kHz–2.1MHz); LED current is programmed by CTRLx pin voltage (10mV–100mV full-scale sense threshold), with automatic 10× scaling below 1V. Open-LED protection uses OVPx pins referenced to 1V internal comparator; shutdown (SHDN) disables all regulators and bias circuits below 0.4V.
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 or industrial 24V supplies without external pre-regulation. |
| Output Current per Channel | Programmable up to 600mA via external sense resistor - supports high-brightness LED strings with tight current matching across channels. |
| PWM Dimming Ratio | 3000:1 at 100Hz - achieves flicker-free, high-fidelity color mixing in RGB signage and display backlighting. |
| Switching Frequency Range | 330kHz to 2.1MHz (FADJ-programmable) - allows optimization of inductor size, efficiency, and EMI profile per application constraints. |
| Current Sense Threshold Range | 10mV to 100mV (via CTRLx pin) - enables precise low-loss current setting with minimal power dissipation in sense resistor. |
| Integrated Switch Rating | 600mA continuous, 60V breakdown (SWx pins) - supports boost configurations driving 10+ LEDs in series from 5V input. |
| Package Thermal Resistance | θJA = 34°C/W, θJC = 2.7°C/W (QFN-28) - requires exposed pad soldered to PCB ground plane for reliable operation at full load in ambient up to 85°C. |
Pinout & Package
LT3492IUFD#TRPBF is housed in a 28-lead (4mm × 5mm) plastic QFN package with exposed thermal pad (Pin 29 = GND). The package is lead-free, RoHS-compliant, and supplied in tape-and-reel format (TRPBF suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply rail | Accepts 3V–30V; powers internal bias circuits and switch drivers - requires local 1μF ceramic bypass capacitor. |
| SHDN | Global shutdown control | Logic-high (>1.5V) enables all three converters; logic-low (<0.4V) reduces quiescent current to <10μA. |
| PWM1–PWM3 | Per-channel PWM dimming inputs | Active-high signals enabling/disabling each channel independently; drive external PMOS disconnect via TGx when low. |
| CTRL1–CTRL3 | Per-channel current sense threshold | Sets ISPx–ISNx voltage (10mV–100mV); sub-1V values scale threshold by 10× for ultra-low sense loss. |
| ISP1–ISP3 / ISN1–ISN3 | Differential current sense inputs | Connect across external sense resistor; high-impedance inputs minimize measurement error and channel crosstalk. |
| TG1–TG3 | PMOS gate driver outputs | Drive external P-channel MOSFETs to disconnect LED strings during PWM off-time - limits ISPx–TGx to 6.5V for gate protection. |
| SW1–SW3 | Internal NPN switch collectors | Connect to inductor and Schottky diode anode; rated 600mA/60V - layout must minimize trace area to reduce EMI. |
| OVP1–OVP3 | Open-LED protection inputs | Monitor output voltage via resistor divider; >1V triggers shutdown of respective channel while others remain active. |
| FADJ | Frequency adjustment input | Voltage-controlled setting (0.1V–1.5V) determines switching frequency - tied to VREF via RC filter for soft-start. |
| VREF | 2.0V precision reference output | Supplies up to 200μA; used for biasing CTRL/FADJ/OVP networks and as stable reference for external circuitry. |
| GND | Signal and power ground | Exposed pad (Pin 29) is primary thermal and electrical ground - must be soldered to large PCB ground plane with thermal vias. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ dimming | 3000:1 linear dimming ratio per channel preserves color fidelity across brightness levels - critical for RGB displays and architectural lighting. |
| Triple independent current regulators | Three fully isolated buck/boost/buck-boost channels with separate CTRL, PWM, OVP, and compensation pins - enables mixed-topology designs (e.g., buck for red, boost for blue/green). |
| Integrated PMOS gate drivers | TG1–TG3 outputs eliminate need for external level-shifters or discrete drivers - simplifies board layout and improves PWM timing accuracy. |
| Open-LED fault protection | OVP1–OVP3 pins provide per-channel overvoltage detection - prevents runaway output voltage if LED string opens, while preserving operation of remaining channels. |
| Adjustable frequency with soft-start | FADJ pin enables frequency tuning and RC-filtered ramp-up - reduces inrush current and avoids input voltage droop during startup. |
| Wide input voltage range | 3V–30V operation with 40V transient tolerance - supports direct integration into 12V/24V automotive, industrial, and signage power architectures. |
Applications
| RGB Backlighting for Large Displays | Automotive Interior Ambient Lighting |
|---|---|
Use Scenario: Driving red, green, and blue LED strings behind LCD panels in digital billboards or transportation signage. IC Role / Device Role / Timing Role: Triple-channel constant-current source regulating each color independently with synchronized PWM dimming. Use Value: Enables precise white-point tuning and smooth grayscale transitions using 3000:1 dimming - eliminates color shift at low brightness. |
Use Scenario: Illuminating footwells, door sills, and dashboard accents in passenger vehicles with programmable color themes. IC Role / Device Role / Timing Role: High-reliability LED driver meeting AEC-Q100 temperature grade (–40°C to 125°C) with robust transient protection. Use Value: Withstands 40V load-dump transients and operates down to 3V cold-crank - ensures uninterrupted lighting during engine start. |
| Avionic Cabin Mood Lighting | Architectural LED Strip Controllers |
Use Scenario: Multi-zone cabin lighting in commercial aircraft, where EMI compliance and thermal reliability are mission-critical. IC Role / Device Role / Timing Role: Low-noise current regulator with adjustable 330kHz–2.1MHz switching - minimizes conducted emissions in sensitive RF environments. Use Value: QFN-28 package with exposed pad enables compact, thermally efficient layout - meets DO-160 Section 20 radiated emissions requirements. |
Use Scenario: Powering addressable LED strips in retail, hospitality, or museum installations requiring uniform brightness and long cable runs. IC Role / Device Role / Timing Role: Buck-boost capable driver supporting variable forward voltage (2.5V–58V) across mixed-color LED segments. Use Value: Per-channel OVP and open-LED detection prevent single-point failure from disabling entire strip - improves system uptime. |
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, 40V rating; no integrated PMOS driver or 3000:1 PWM | Requires external dimming circuitry and discrete disconnect MOSFETs per channel | Select when higher per-channel current (>600mA) is needed and multi-channel integration is not required. |
| TPS61165DRVR | Single-channel, 40V, 1.2A boost driver; supports only 1000:1 PWM; no OVP or multi-topology flexibility | Lacks independent channel control, open-LED protection, and buck/buck-boost modes | Choose for cost-sensitive, single-color boost-only applications where 3000:1 dimming is unnecessary. |
Compared with LT3466EFE#TRPBF and TPS61165DRVR, the LT3492IUFD#TRPBF uniquely delivers three independent, high-dimming-ratio channels in one package with built-in protection and topology flexibility - reducing BOM count and PCB area in RGB systems by >40% versus discrete solutions.
Availability
LT3492IUFD#TRPBF is available at Aetrix Electronics and suitable for RGB lighting, automotive interior illumination, and avionic cabin mood lighting requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term production continuity.
Supply support for LT3492IUFD#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and aerospace markets.
The LT3492IUFD#TRPBF belongs to Linear's high-dynamic-range LED driver product line, designed specifically for multi-channel, high-fidelity lighting applications demanding precision current regulation, wide dimming range, and robust fault protection.
FAQ
What is the maximum LED string voltage the LT3492IUFD#TRPBF can drive in boost mode?
The LT3492IUFD#TRPBF supports up to 60V at its SWx pins and ISPx inputs. In boost configuration, output voltage is limited by external component ratings and thermal design - typical implementations drive 10–12 white LEDs (3.2V each) to ~38–48V. Exceeding 58V risks violating absolute maximum ratings and requires careful attention to Schottky diode VR and capacitor voltage derating. The LT3492IUFD#TRPBF datasheet confirms 60V switch rating and recommends keeping output below 58V for reliability.
Does the LT3492IUFD#TRPBF support analog dimming in addition to PWM?
Yes, the LT3492IUFD#TRPBF supports analog dimming via its CTRL1–CTRL3 pins, which directly set the current sense threshold from 10mV to 100mV. When CTRLx voltage is below 1V, the effective threshold is scaled by 10× (e.g., 0.12V → 12mV), enabling fine-grained current adjustment. This feature is often combined with PWM for hybrid dimming schemes. The LT3492IUFD#TRPBF datasheet specifies this behavior in the Electrical Characteristics table and Applications Information section.
How does the LT3492IUFD#TRPBF handle thermal overload conditions?
The LT3492IUFD#TRPBF does not include internal thermal shutdown; instead, it relies on external overtemperature protection implemented via the CTRL pins. A PTC thermistor network (e.g., Figure 2 in the datasheet) can be connected to CTRL1–CTRL3 to reduce LED current as temperature rises - preventing thermal runaway. Safe operation requires proper PCB thermal design: the exposed pad must be soldered to a solid ground plane with ≥4 thermal vias. The LT3492IUFD#TRPBF junction temperature must not exceed 125°C under worst-case load and ambient conditions.
Can the LT3492IUFD#TRPBF operate in buck, boost, and buck-boost topologies simultaneously across its three channels?
Yes, the LT3492IUFD#TRPBF supports independent topology selection per channel. Each channel's external components (inductor, diode, capacitor) define its configuration: buck (SWx to inductor, ISPx to LED cathode), boost (SWx to inductor, ISPx to LED anode), or buck-boost (SWx to inductor center-tap, ISPx to LED). The LT3492IUFD#TRPBF datasheet shows working examples of all three topologies and confirms that shared internal circuitry (oscillator, reference) does not constrain individual channel operation.
What is the purpose of the TG1–TG3 pins on the LT3492IUFD#TRPBF, and are they mandatory?
The TG1–TG3 pins are dedicated gate drivers for external P-channel MOSFETs used to disconnect LED strings during PWM off-time - essential for achieving true 3000:1 dimming without leakage current. They are not mandatory: if high-dimming-ratio PWM is not required, TGx pins can be left unconnected and the PMOS omitted. However, omitting them reduces dimming ratio to ~100:1 due to residual current through the LED string. The LT3492IUFD#TRPBF datasheet explicitly states "Leave open if the external MOSFET is not used" in the Pin Functions section.
LT3492IUFD#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)
LT3492IUFD#TRPBF FAQ
1.How can I place an order for LT3492IUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3492IUFD#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 LT3492IUFD#TRPBF reliable?
The price and inventory of LT3492IUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3492IUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3492IUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3492IUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3492IUFD#TRPBF?
LT3492IUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3492IUFD#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 LT3492IUFD#TRPBF?
For technical support, including LT3492IUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3492IUFD#TRPBF requirements.
6.How does Aetrix verify that LT3492IUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3492IUFD#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 LT3492IUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3492IUFD#TRPBF?
All LT3492IUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3492IUFD#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 LT3492IUFD#TRPBF part is unused and in its original packaging.
Return procedure for LT3492IUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3492IUFD#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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