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Analog Devices Inc. LT3492IFE#PBF
- Part No.:
- LT3492IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3492IFE#PBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,339
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Product details
Overview
LT3492IFE#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, 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 current matching across three independent LED strings.
For engineers reviewing the LT3492IFE#PBF datasheet, LT3492IFE#PBF pinout, LT3492IFE#PBF application, or LT3492IFE#PBF equivalent, key selection criteria include channel independence, true-color PWM dimming fidelity, open-LED protection per channel, thermal derating at >1MHz operation, and compatibility with external P-channel MOSFET disconnect for ultra-high dimming ratios.
Technical Context
The LT3492IFE#PBF implements fixed-frequency current-mode control with three fully replicated converter channels sharing only oscillator, reference, and bias circuits. Each channel includes an internal 600mA NPN switch, dedicated ISP/ISN current-sense inputs, VC compensation node, and TG gate driver for external PMOS LED disconnect.
It supports analog current programming via CTRL pins (10mV–100mV sense threshold), open-LED protection via OVP pins (1V threshold), and synchronized PWM dimming across all three channels. Frequency is set by FADJ voltage (0.1V–1.5V), with soft-start enabled by RC filtering from VREF.
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 string current and defines inductor sizing constraints. |
| PWM Dimming Ratio | 3000:1 at 100Hz - achieves flicker-free, high-fidelity color mixing in RGB signage and avionics displays. |
| Switching Frequency Range | 330kHz to 2.1MHz - allows trade-off between efficiency (lower fSW) and solution size (higher fSW). |
| Current Sense Threshold | Programmable from 10mV to 100mV via CTRL pin - enables precise LED current scaling with minimal sense resistor power loss. |
| Operating Temperature | –40°C to +125°C junction - qualified for under-hood automotive and industrial ambient environments. |
| Package Type | 28-lead TSSOP (FE package) with exposed pad - provides thermal path to PCB ground plane for power dissipation management. |
Pinout & Package
LT3492IFE#PBF 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 soldering of the exposed pad to a PCB ground plane for thermal and electrical integrity.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| SHDN | Global shutdown control | Logic-high (>1.5V) enables all three converters; logic-low (<0.4V) disables bias and switching, reducing quiescent current to <10μA. |
| PWM1–PWM3 | Per-channel PWM dimming input | Active-high signal synchronizes LED on/off timing; low state forces TG output high to disconnect external PMOS and places VC in high-Z mode. |
| CTRL1–CTRL3 | Per-channel current sense threshold | Sets LED current via external sense resistor: ILED = VCTRL/10RSENSE (if VCTRL < 1V) or 100mV/RSENSE (if ≥1V). |
| ISP1–ISP3 / ISN1–ISN3 | Differential current sense inputs | High-impedance inputs (≤1μA bias) measure voltage across external sense resistor; require Kelvin routing to avoid trace resistance errors. |
| 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 protection input | Monitors output voltage via resistor divider; >1V input disables respective channel's switch to prevent overvoltage failure. |
| VIN | Main power input | Supplies internal regulators and bias circuits; requires local 1μF ceramic bypass capacitor placed adjacent to pin. |
| GND | Signal and power ground | Shared reference for all analog and switching functions; exposed pad (Pin 29) must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent constant-current channels | Enables simultaneous, uncorrelated driving of RGB or multi-zone white LED strings without cross-talk or shared component dependencies. |
| True Color PWM™ dimming | Maintains consistent LED spectral output across full 3000:1 dimming range by preserving current waveform fidelity during PWM on-time. |
| Built-in PMOS gate drivers (TG1–TG3) | Eliminates need for external level-shifting circuitry when using high-side P-channel disconnect MOSFETs for ultra-deep dimming. |
| Per-channel open-LED protection | Isolates fault in one LED string while allowing remaining two channels to continue operation - critical for redundancy in automotive lighting. |
| Adjustable switching frequency (330kHz–2.1MHz) | Allows optimization of inductor size, efficiency, and EMI profile per application; higher frequencies reduce passive component footprint. |
| Wide input voltage range (3V–30V) | Supports direct integration into 12V/24V automotive, industrial, and signage power buses without intermediate regulation stages. |
Applications
| RGB Signage Control | Automotive Interior Lighting |
|---|---|
Use Scenario: Driving red, green, and blue LED strings in outdoor digital billboards with ambient temperature ranging from –40°C to +85°C. IC Role / Device Role / Timing Role: Constant-current source per channel with synchronized PWM dimming and independent current calibration via CTRL pins. Use Value: Enables pixel-level color accuracy and uniform brightness across large-area displays without thermal drift-induced hue shift. |
Use Scenario: Illuminating instrument clusters and ambient footwell lighting in vehicles with variable battery voltage (9V–16V) and EMC-critical environments. IC Role / Device Role / Timing Role: Triple-channel buck-mode LED driver with open-LED fault reporting and thermal foldback via CTRL-connected PTC network. Use Value: Ensures functional safety compliance (ISO 26262 ASIL-B readiness) through per-string fault isolation and predictable current limiting behavior. |
| Avionics Cabin Lighting | Industrial Machine Vision Lighting |
Use Scenario: Powering multi-color status indicators and reading lights in commercial aircraft cabins where EMI and reliability are mission-critical. IC Role / Device Role / Timing Role: High-dimming-ratio LED driver with low-noise current regulation and synchronized PWM across all channels to eliminate beat frequencies. Use Value: Meets DO-160 Section 20 radiated emissions requirements due to controlled slew rates and minimized SW node area in layout. |
Use Scenario: Providing strobed, high-intensity illumination for high-speed camera inspection systems requiring microsecond-level timing precision. IC Role / Device Role / Timing Role: Fast-response constant-current source with sub-100ns gate turn-on/off delay and VC node hold capability during PWM off-time. Use Value: Delivers repeatable light intensity and zero current droop between strobes, enabling accurate grayscale capture in automated optical inspection (AOI). |
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 driver, max 1000:1 PWM dimming | Lacks channel independence and deep-dimming capability; requires external gate drivers for PMOS disconnect | Use only when single-string drive suffices and cost sensitivity outweighs dimming fidelity requirements. |
| MAX20050ATP/V+T | Triple-channel, 3.5A per channel, I²C programmable, 1000:1 PWM, no TG outputs | Requires external MOSFETs and level shifters for high-side disconnect; adds firmware dependency and BOM complexity | Select when digital configurability and higher current per channel are prioritized over analog simplicity and ultra-high dimming ratio. |
Compared with LT3492IFE#PBF, LT3466EFE#PBF offers higher per-channel current but lacks multi-channel integration and True Color PWM; MAX20050ATP/V+T provides digital control and higher current but increases system complexity and eliminates the self-contained TG driver advantage.
Availability
LT3492IFE#PBF is available at Aetrix Electronics and suitable for RGB signage, automotive interior lighting, avionics cabin lighting, and industrial machine vision lighting requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3492IFE#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3492 product line was designed specifically for high-reliability, multi-channel LED lighting applications demanding precise current matching, ultra-high dimming ratios, and robust fault protection - targeting automotive, aerospace, and premium signage segments.
FAQ
What is the maximum LED string voltage supported by LT3492IFE#PBF in boost mode?
The LT3492IFE#PBF supports up to 60V at its ISP pins, enabling LED strings with total forward voltage up to ~58V in boost configuration (accounting for diode drop and margin). This is validated by absolute maximum ratings and typical application circuits using 10–12 LEDs per string at 3.2V–4.5V each.
Does LT3492IFE#PBF require external components for PWM dimming synchronization across all three channels?
No - the LT3492IFE#PBF does not require external synchronization circuitry. Its internal architecture ensures that PWM1, PWM2, and PWM3 inputs operate independently yet maintain timing coherence when driven by a common clock source; rising-edge alignment is recommended for optimal dimming linearity.
Can LT3492IFE#PBF operate without external PMOS transistors for LED disconnect?
Yes - the LT3492IFE#PBF can operate without external PMOS transistors. In such cases, TG pins are left open, and PWM dimming occurs solely via switch modulation. However, this reduces achievable dimming ratio to ~1000:1 and eliminates true-color fidelity benefits of the TG-driven disconnect method.
What is the purpose of the OVP1–OVP3 pins on LT3492IFE#PBF, and how are they configured?
The OVP1–OVP3 pins on LT3492IFE#PBF provide per-channel open-LED protection by monitoring output voltage via an external resistor divider. When voltage exceeds 1V (internally referenced), the corresponding channel's switch disables. If unused, OVP pins must be tied to GND to prevent floating inputs.
How does the CTRL pin affect LED current accuracy and temperature stability in LT3492IFE#PBF?
The CTRL pin sets the current sense threshold with ±2% typical accuracy over –40°C to +125°C. Its low bias current (<100nA) minimizes resistor-divider error, and the internal 1V reference tracking ensures stable current scaling across temperature - critical for maintaining color point consistency in RGB systems.
LT3492IFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LT3492IFE#PBF FAQ
1.How can I place an order for LT3492IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3492IFE#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 LT3492IFE#PBF reliable?
The price and inventory of LT3492IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3492IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3492IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3492IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3492IFE#PBF?
LT3492IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3492IFE#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 LT3492IFE#PBF?
For technical support, including LT3492IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3492IFE#PBF requirements.
6.How does Aetrix verify that LT3492IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3492IFE#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 LT3492IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3492IFE#PBF?
All LT3492IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3492IFE#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 LT3492IFE#PBF part is unused and in its original packaging.
Return procedure for LT3492IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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