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Analog Devices Inc. LT3492EFE#TRPBF
- Part No.:
- LT3492EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3492EFE#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,127
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Product details
Overview
LT3492EFE#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 true-color PWM dimming up to 3000:1 per channel, supports 3V–30V input, and features adjustable switching frequency (330kHz–2.1MHz) for RGB lighting and automotive display backlighting.
For engineers reviewing the LT3492EFE#TRPBF datasheet, LT3492EFE#TRPBF pinout, LT3492EFE#TRPBF application, or LT3492EFE#TRPBF equivalent, key selection criteria include per-channel analog current programming via CTRL pins (10mV–100mV sense threshold), open-LED protection on all three outputs, and thermal-aware layout requirements for the exposed-pad 28-lead TSSOP package.
Technical Context
The LT3492EFE#TRPBF implements fixed-frequency current-mode control with independent error amplifiers, slope compensation, and SR-latch-based PWM regulation per channel. Each output includes dedicated ISP/ISN current-sense inputs, VC compensation nodes, OVP fault detection, and TG-driven external PMOS disconnect switches.
Its architecture enables simultaneous operation across mixed topologies - e.g., one channel in buck mode for low-Vf LEDs, another in boost for high-string-count arrays - while sharing only oscillator, reference, and bias circuits. Frequency adjustment via FADJ pin directly scales ramp amplitude and oscillator period without altering loop stability margins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 30V continuous; 40V transient rating - enables direct connection to 12V/24V automotive rails with surge margin. |
| Switch Rating | 600mA max per channel, 60V VCE(SAT) ≤340mV at 500mA - supports medium-power LED strings without external switches. |
| PWM Dimming Ratio | 3000:1 at 100Hz - achieves high-fidelity grayscale control in signage and avionics displays without color shift. |
| CTRL Pin Sense Threshold | Programmable 10mV–100mV full-scale LED current sense voltage - allows precise analog dimming or thermal foldback using PTC networks. |
| Switching Frequency Range | 330kHz to 2.1MHz via FADJ pin - balances efficiency (low fSW) vs. component size (high fSW) across diverse LED configurations. |
| Package Thermal Resistance | θJA = 30°C/W (TSSOP), θJC = 10°C/W - requires soldered exposed pad to PCB ground plane for reliable 125°C junction operation. |
| Operating Temperature | –40°C to +125°C junction - qualified for under-hood automotive and industrial ambient environments. |
Pinout & Package
LT3492EFE#TRPBF is housed in a 28-lead plastic TSSOP (FE package) with exposed thermal pad (Pin 29 = GND). The package measures 9.7mm × 4.4mm × 1.1mm and requires mandatory soldering of the exposed pad to a PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN | Global shutdown control | Logic-high (>1.5V) enables all three channels; logic-low (<0.4V) disables regulators and reduces quiescent current to 0.1μA. |
| PWM1–PWM3 | Per-channel PWM dimming inputs | Active-high signals that gate internal MOSFET drivers (TG1–TG3) and place VC pins in high-Z state during off-time for linear dimming retention. |
| CTRL1–CTRL3 | Per-channel current sense threshold | Sets LED current sense voltage: ≤1V → 1/10×CTRL value; >1V → fixed 100mV - enables analog dimming or overtemperature protection. |
| ISP1–ISP3 / ISN1–ISN3 | Differential current sense inputs | High-impedance inputs (≤1μA bias) measuring voltage across external sense resistor - must be routed as separate Kelvin pairs to avoid channel crosstalk. |
| TG1–TG3 | PMOS gate drive outputs | Drives external P-channel MOSFETs with 0.1–6.5V swing (ISP–TG limited); turns off LED string during PWM low for true 0% duty-cycle cutoff. |
| OVP1–OVP3 | Open-LED protection inputs | Monitor output voltage via resistor divider; >1V triggers shutdown of respective channel while others remain active - prevents overvoltage damage. |
| VIN | Main power input | Supplies internal bias and switch drivers; requires local 1μF ceramic bypass capacitor placed adjacent to pin. |
| GND | Signal and power ground | Shared return for all circuits; exposed pad (Pin 29) must be soldered to PCB ground plane for thermal conduction and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent current-regulated outputs | Each channel operates autonomously in buck/boost/buck-boost with separate ISP/ISN, CTRL, VC, and OVP - enables mixed-topology LED arrays in single-package solution. |
| True Color PWM™ dimming | 3000:1 ratio achieved by holding VC voltage during PWM off-time and synchronizing rising edges across all three PWM inputs - preserves linearity and eliminates color shift. |
| Integrated PMOS gate drivers | TG outputs actively pull up to ISP rail with 6.5V clamp - eliminates need for level-shifting circuitry when disconnecting high-side LED strings. |
| Adjustable switching frequency | FADJ pin accepts 0.1V–1.5V to set 330kHz–2.1MHz - allows optimization for EMI compliance, inductor size, and efficiency in varying input/output conditions. |
| Robust protection suite | Includes undervoltage lockout (2.1V), open-LED detection (1V OVP threshold), thermal shutdown (125°C), and 40V transient tolerance - ensures reliability in harsh environments. |
Applications
| Automotive Interior Lighting | RGB Backlighting for Large Displays |
|---|---|
|
Use Scenario: Driving multi-color LED strips for dashboard illumination and ambient cabin lighting with synchronized dimming. IC Role / Device Role / Timing Role: Constant-current regulator delivering independent 0.3A per channel to red/green/blue LED strings in buck configuration. Use Value: 3000:1 PWM dimming enables smooth fade transitions and precise white-point tuning without visible stepping or hue shift. |
Use Scenario: Powering high-brightness LED arrays behind outdoor billboards and transit information panels. IC Role / Device Role / Timing Role: Triple boost-mode driver supplying 100mA to 12-LED series strings from 12V supply. Use Value: Adjustable 1.3MHz switching frequency minimizes inductor size while maintaining >85% efficiency at full load. |
| Avionic Cockpit Displays | Industrial Machine Vision Lighting |
|
Use Scenario: Illuminating critical flight instrumentation with fail-safe redundancy and wide temperature operation. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with per-channel OVP and –40°C to +125°C operation supporting MIL-STD-810H environments. Use Value: Open-LED protection isolates failed channels so remaining LEDs maintain visibility during in-flight diagnostics. |
Use Scenario: Providing strobed, high-intensity illumination for barcode scanners and automated optical inspection systems. IC Role / Device Role / Timing Role: Fast-response current source enabling microsecond-level PWM timing control via synchronized PWM1–PWM3 inputs. Use Value: Sub-100ns gate turn-on/off delays ensure accurate light pulse width matching across all three color channels. |
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 |
|---|---|---|---|
| LT3492IFE#TRPBF | Same silicon, extended –40°C to +125°C guaranteed performance (vs. E-grade's 0°C to +125°C spec, assured by design over full range) | Required for designs needing production-tested performance across full industrial temperature range | Select I-grade for automotive AEC-Q100-compliant systems or industrial deployments where full-range validation is mandated. |
| LT3492EUFD#TRPBF | Identical functionality in 4mm × 5mm QFN package (UFD) with lower θJA = 34°C/W and superior thermal performance | Better suited for space-constrained or thermally demanding layouts where TSSOP footprint or thermal resistance is limiting | Choose UFD when board area is constrained or junction temperature margin is critical under high ambient conditions. |
Compared with LT3492EFE#TRPBF, the I-grade variant provides factory-guaranteed operation across –40°C to +125°C, while the QFN-packaged EUFD version offers improved thermal dissipation and smaller footprint - both retain identical electrical specs, pinout, and feature set.
Availability
LT3492EFE#TRPBF is available at Aetrix Electronics and suitable for automotive interior lighting, RGB display backlighting, and avionic cockpit illumination requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT3492EFE#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 its legacy of high-performance analog ICs for precision power, signal conditioning, and timing applications.
The LT3492 product line was designed specifically for high-dimming-ratio, multi-channel LED driving in automotive, aerospace, and industrial displays - emphasizing robustness, channel independence, and thermal resilience.
FAQ
What is the maximum LED string voltage supported by LT3492EFE#TRPBF in boost mode?
The LT3492EFE#TRPBF supports up to 60V at the ISPx pins, enabling boost-mode operation with LED strings up to ~55V (accounting for diode drop and headroom). Its internal 60V-rated switches and OVP inputs allow direct interface with high-Vf arrays without external HV transistors. Always verify maximum duty cycle limits per application to avoid saturation.
Can LT3492EFE#TRPBF drive LEDs in buck-boost configuration?
Yes, the LT3492EFE#TRPBF supports buck-boost topology per channel using standard SEPIC or inverting converter layouts. Its current-mode architecture and wide input/output voltage range (3V–30V VIN, up to 60V at ISP) make it suitable for applications where LED string voltage may exceed or fall below input rail - such as 12V-powered systems driving 24V or 5V LED loads.
How does the CTRL pin affect LED current accuracy in LT3492EFE#TRPBF?
The CTRL pin sets the current sense threshold: below 1V, it scales linearly to 1/10×CTRL voltage; above 1V, it defaults to 100mV. This dual-range design enables precise analog dimming (e.g., 10mV–100mV) or fixed-current operation. Input bias current is ≤100nA, minimizing error from external resistor dividers used for thermal foldback or dimming control.
Is LT3492EFE#TRPBF pin-compatible with other variants in the LT3492 family?
Yes, all LT3492 variants - including LT3492EFE#TRPBF, LT3492IFE#TRPBF, LT3492EUFD#TRPBF, and LT3492IUFD#TRPBF - share identical pinouts and electrical behavior. Only package type (TSSOP vs. QFN) and temperature grade differ. No PCB redesign is needed when upgrading from EFE to IFE or migrating to QFN for thermal improvement.
What layout practices are critical for stable operation of LT3492EFE#TRPBF?
Essential layout practices for LT3492EFE#TRPBF include: soldering the exposed pad (Pin 29) to a solid ground plane with ≥4 thermal vias; routing ISP/ISN traces as separate Kelvin pairs directly to sense resistors; placing 1μF VIN bypass capacitor within 2mm of the pin; minimizing SW node area; and star-grounding OVP/VC traces to the IC's GND pad - not to noisy power ground planes.
LT3492EFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LT3492EFE#TRPBF FAQ
1.How can I place an order for LT3492EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3492EFE#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 LT3492EFE#TRPBF reliable?
The price and inventory of LT3492EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3492EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3492EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3492EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3492EFE#TRPBF?
LT3492EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3492EFE#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 LT3492EFE#TRPBF?
For technical support, including LT3492EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3492EFE#TRPBF requirements.
6.How does Aetrix verify that LT3492EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3492EFE#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 LT3492EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3492EFE#TRPBF?
All LT3492EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3492EFE#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 LT3492EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3492EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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