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Analog Devices Inc. LT3492EFE#PBF
- Part No.:
- LT3492EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3492EFE#PBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:130
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Product details
Overview
LT3492EFE#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 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 LT3492EFE#PBF datasheet, LT3492EFE#PBF pinout, LT3492EFE#PBF application, or LT3492EFE#PBF equivalent, key selection considerations include per-channel analog/PWM dimming control via CTRL and PWM pins, open-LED protection on all three outputs, thermal management via exposed pad soldering, and compatibility with external P-channel MOSFETs for high-dimming-range LED disconnect.
Technical Context
The LT3492EFE#PBF implements fixed-frequency current-mode control with independent error amplifiers, slope compensation, and SR-latch-based PWM generation per channel. Each channel includes a dedicated 600mA NPN switch, ISP/ISN current-sense inputs, VC compensation node, and TG output driving external PMOS for LED string disconnect.
It integrates shared oscillator, ramp generator, 2V reference, UVLO, and internal regulator across all three channels while replicating power stage control logic-including PWM comparator, latch, and gate drivers-for true channel independence. The FADJ pin sets switching frequency by adjusting oscillator ramp amplitude, and OVP pins provide per-channel open-LED fault detection with 1V threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 30V continuous; transient-rated to 40V - enables direct operation from automotive battery or industrial 24V rails without pre-regulation. |
| Switch Current Limit | 600mA typical per channel - supports up to 0.3A LED current with margin for ripple and thermal derating. |
| Dimming Ratio | 3000:1 PWM per channel at 100Hz - achieves high-fidelity grayscale control in signage and avionics displays. |
| Switching Frequency Range | 330kHz to 2.1MHz via FADJ pin - allows trade-off between efficiency (lower fSW) and component size (higher fSW). |
| CTRL Pin Sense Threshold | 10mV to 100mV programmable - sets LED current sense voltage with 10× scaling below 1V, enabling fine analog dimming or thermal foldback. |
| Open-LED Protection | Per-channel OVP pins with 1V threshold - disables individual switch if LED string opens, preserving operation of remaining two channels. |
| Package Thermal Resistance | θJA = 30°C/W (TSSOP), θJC = 10°C/W - requires exposed pad soldered to PCB ground plane for reliable 125°C junction operation. |
Pinout & Package
LT3492EFE#PBF is housed in a 28-lead plastic TSSOP package (FE) with exposed pad (Pin 29) that must be soldered to PCB ground for thermal and electrical integrity. Pin pitch is 0.65mm; body dimensions are 4.4mm × 9.7mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN | Global shutdown enable | Logic-high (>1.5V) enables all three converters; logic-low (<0.4V) disables bias circuits and reduces quiescent current to ≤10μA. |
| PWM1–PWM3 | Per-channel PWM dimming input | Active-high signal controls LED on/off state; low state disconnects LED string via TG driver and places VC in high-Z mode for linear dimming retention. |
| CTRL1–CTRL3 | Per-channel current sense threshold | Sets ISP–ISN voltage (10mV–100mV) to program LED current; <1V enables 10× scaling for precise analog dimming or thermal foldback. |
| TG1–TG3 | PMOS gate driver output | Drives external P-channel MOSFET gate; limits ISP–TG voltage to ≤6.5V to protect MOSFET gate oxide; floats when unused. |
| ISP1–ISP3 / ISN1–ISN3 | Differential current sense inputs | Connect across external sense resistor; high-impedance inputs (≤1μA bias) ensure accurate current regulation without loading. |
| OVP1–OVP3 | Per-channel open-LED detect | 1V threshold comparator input; >1V disables respective switch to prevent overvoltage during LED string failure. |
| VIN | Main power input | Supplies internal bias and switch drivers; requires local 1μF ceramic bypass capacitor placed adjacent to pin. |
| GND (Pin 29) | Signal and power ground | Exposed pad is GND; mandatory solder connection to PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent constant-current channels | Each channel regulates LED current separately using dedicated NPN switch, error amplifier, and PWM latch - eliminates cross-channel interference in RGB or multi-zone lighting. |
| True Color PWM™ dimming | 3000:1 dimming ratio achieved by combining external PWM gating with internal VC voltage hold - preserves color fidelity across full brightness range without current-stepping artifacts. |
| Built-in PMOS gate driver (TG pins) | Provides controlled turn-on/turn-off of external P-channel MOSFET with 110ns delay and 6.5V gate clamp - enables fast, reliable LED string disconnect for high-dimming applications. |
| Adjustable switching frequency (330kHz–2.1MHz) | FADJ pin accepts 0.1V–1.5V to set frequency - allows optimization for EMI compliance, inductor size, or efficiency in space-constrained designs. |
| Per-channel open-LED protection | OVP pins monitor output voltage via external divider; fault on one channel does not affect others - improves system reliability in large display arrays. |
| Wide input voltage range with UVLO | Operates from 3V to 30V; undervoltage lockout activates below 2.1V - ensures stable startup and prevents erratic switching during brownout conditions. |
Applications
| RGB Automotive Interior Lighting | Large-Scale Outdoor Billboards |
|---|---|
Use Scenario: Driving red/green/blue LED strings in vehicle cabin ambient lighting with synchronized dimming and color mixing. IC Role / Device Role / Timing Role: Constant-current source per color channel with independent PWM and analog control for white-point tuning and dynamic mood lighting. Use Value: 3000:1 dimming per channel enables smooth fade-to-black transitions without color shift; open-LED protection prevents single-string failure from disabling entire lighting zone. |
Use Scenario: Powering high-brightness LED modules in outdoor digital signage exposed to wide temperature and input voltage variation. IC Role / Device Role / Timing Role: Triple-output buck-boost LED driver supporting mixed-series LED configurations across varying panel voltages (12V–48V). Use Value: 3V–30V input range accommodates battery-backed or PoE-powered installations; thermal design with exposed pad ensures stable operation at 85°C ambient. |
| Aircraft Cockpit Display Backlighting | Industrial Machine Vision Lighting |
Use Scenario: Providing flicker-free, dimmable backlight for TFT LCDs in avionics displays requiring DO-160 compliance and EMI robustness. IC Role / Device Role / Timing Role: High-stability current source with fixed-frequency current-mode control minimizing conducted emissions; FADJ pin enables EMI spread-spectrum tuning. Use Value: Adjustable 330kHz–2.1MHz switching avoids critical aircraft communication bands; per-channel OVP ensures backlight remains functional even if one LED string fails. |
Use Scenario: Illuminating inspection targets with precisely timed, high-intensity strobed light pulses synchronized to camera exposure. IC Role / Device Role / Timing Role: Fast-response LED driver with sub-200ns PWM edge control (TG driver) and VC hold for repeatable pulse amplitude. Use Value: PMOS gate driver enables <1μs LED turn-off; CTRL pin allows real-time current adjustment during strobe sequence to compensate for thermal drift. |
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 |
|---|---|---|---|
| LTC3219EUD#PBF | Charge-pump based (no inductors); max 350mA per channel; fixed 3.2MHz fSW; no OVP pins or TG drivers. | Best for low-noise, inductorless designs with lower current and simpler protection needs - unsuitable for high-voltage boost or open-LED-critical systems. | Select LTC3219EUD#PBF only for compact, low-EMI applications where input voltage is tightly regulated and LED string integrity is monitored externally. |
| TPS68402RHBR | Triple buck LED driver; 1.5A per channel; I²C interface; integrated MOSFETs; no external PMOS gate drive or OVP pins. | Offers digital control and higher current but lacks analog dimming flexibility, open-LED protection, and external MOSFET support - better for smart lighting with microcontroller coordination. | Choose TPS68402RHBR when system-level intelligence (e.g., closed-loop color feedback) justifies added firmware complexity and board space for I²C routing. |
Compared with LTC3219EUD#PBF and TPS68402RHBR, the LT3492EFE#PBF uniquely combines per-channel analog+PWM dimming, external PMOS gate drive for ultra-high dimming ratios, and hardware-based open-LED protection - making it optimal for safety-critical, high-reliability LED lighting where deterministic fault response and color fidelity are non-negotiable.
Availability
LT3492EFE#PBF is available at Aetrix Electronics and suitable for RGB automotive interior lighting, large-scale outdoor billboards, and aircraft cockpit display backlighting requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to +125°C.
Supply support for LT3492EFE#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial automation, and aerospace markets.
The LT3492 product line was designed specifically for high-reliability, multi-channel LED lighting in automotive, avionics, and signage applications - emphasizing deterministic dimming, fault resilience, and thermal robustness in harsh environments.
FAQ
What is the maximum LED string voltage supported by LT3492EFE#PBF in boost mode?
The LT3492EFE#PBF supports up to 60V at its SW, ISP, and ISN pins. In boost configuration, output voltage is limited by external component ratings and thermal constraints - practical maximum LED string voltage is ~58V, as validated in the Typical Application circuit TA01a with 10 LEDs at 58V PVIN. Exceeding 60V risks damage to internal switches.
Can LT3492EFE#PBF operate with only two channels active while the third is disabled?
Yes. LT3492EFE#PBF supports per-channel enable/disable via PWM1–PWM3 pins. Driving any PWM pin low disables its associated channel's switch, gate driver, and error amplifier, reducing quiescent current. Unused PWM pins must be tied to VREF (2V) - not left floating - to prevent undefined behavior. All three channels remain electrically isolated.
How does the CTRL pin function when set to 0.5V on LT3492EFE#PBF?
When CTRL1–CTRL3 is set to 0.5V on LT3492EFE#PBF, the internal scaling circuit reduces the target ISP–ISN sense voltage to 50mV (0.5V ÷ 10). With a 330mΩ sense resistor, this yields 151.5mA LED current (50mV ÷ 0.33Ω). This 10× scaling applies only below 1V; above 1V, the sense voltage defaults to 100mV regardless of CTRL value.
Is LT3492EFE#PBF RoHS-compliant and lead-free?
Yes. LT3492EFE#PBF carries the #PBF suffix, indicating lead-free finish per JEDEC J-STD-020 and RoHS Directive 2011/65/EU. The device uses matte tin plating over copper leads and meets reflow profile requirements for Pb-free assembly (peak temperature 260°C, 20–40 sec). Full compliance documentation is available from Analog Devices.
What thermal design practices are required for LT3492EFE#PBF at full load?
LT3492EFE#PBF requires the exposed pad (Pin 29) to be soldered to a solid PCB ground plane with ≥4 thermal vias (0.3mm diameter) directly beneath the pad, connected to an internal ground layer. For continuous 600mA/channel operation at 30V input, a minimum 250mm² copper area is recommended. Board layout must minimize SW node area and separate high-impedance traces (VC, OVP) from noisy ground paths.
LT3492EFE#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
LT3492EFE#PBF FAQ
1.How can I place an order for LT3492EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3492EFE#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 LT3492EFE#PBF reliable?
The price and inventory of LT3492EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3492EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3492EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3492EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3492EFE#PBF?
LT3492EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3492EFE#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 LT3492EFE#PBF?
For technical support, including LT3492EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3492EFE#PBF requirements.
6.How does Aetrix verify that LT3492EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3492EFE#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 LT3492EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3492EFE#PBF?
All LT3492EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3492EFE#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 LT3492EFE#PBF part is unused and in its original packaging.
Return procedure for LT3492EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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