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Analog Devices Inc. LT3496IFE#PBF
- Part No.:
- LT3496IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3496IFE#PBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 1A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,051
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Product details
Overview
LT3496IFE#PBF from Analog Devices (formerly Linear Technology) is a triple-output, constant-current DC/DC LED driver IC supporting buck, boost, and buck-boost topologies. It integrates three 750mA, 45V NPN switches with independent PWM dimming (3000:1 ratio), built-in PMOS gate drivers, and programmable switching frequency (330kHz–2.1MHz). It delivers precise RGB color mixing in automotive lighting and large-format displays.
For engineers reviewing the LT3496IFE#PBF datasheet, LT3496IFE#PBF pinout, LT3496IFE#PBF application, or LT3496IFE#PBF equivalent, key selection criteria include per-channel analog/PWM dimming control, open-LED protection, thermal shutdown behavior, and compatibility with external P-channel MOSFET disconnect circuits across all three channels.
Technical Context
The LT3496IFE#PBF employs fixed-frequency current-mode control with shared oscillator, ramp generator, and reference circuitry across three independent channels. Each channel features a dedicated NPN power switch, error amplifier (EAMP), PWM comparator, and gate driver for external P-MOSFETs.
It supports true-color PWM dimming via synchronized PWM1–PWM3 inputs, with VC pins providing high-impedance hold during PWM low states to preserve regulation state. CTRL pins set LED current sense threshold (10mV–100mV range), enabling analog dimming or overtemperature protection when paired with PTC thermistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3V to 30V continuous operation; withstands 40V transients - enables direct connection to 12V/24V automotive rails without pre-regulation. |
| Switch Current Limit | 750mA typical per channel (1250mA max) - supports driving medium-power LED strings up to ~1A with margin. |
| Dimming Ratio | 3000:1 PWM dimming at 120Hz - preserves color fidelity in RGB systems without visible flicker or hue shift. |
| Switching Frequency | 330kHz to 2.1MHz (via fADJ pin) - allows trade-off between efficiency (lower fSW) and component size (higher fSW). |
| LED Current Sense Threshold | Programmable 10mV–100mV via CTRL pins - sets full-scale current with ±2% accuracy over temperature using external sense resistors. |
| Open-LED Protection | OVP1–OVP3 pins trigger shutdown if output voltage exceeds 1V threshold - prevents overvoltage damage during LED string failure. |
| Thermal Grade | –40°C to +125°C junction temperature - qualified for under-hood automotive and industrial ambient environments. |
Pinout & Package
LT3496IFE#PBF uses a 28-lead plastic TSSOP package (4mm × 5mm footprint, 0.65mm pitch) with exposed pad (Pin 29) soldered to PCB ground for thermal and electrical integrity. θJA = 30°C/W, θJC = 10°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN | Global shutdown enable | Logic-high ≥1.5V enables all three regulators; ≤0.4V disables switching and reduces quiescent current to 0.1µA. |
| PWM1–PWM3 | Per-channel PWM dimming input | High = active regulation; low = converter off, TG pulled high to CAP, LED disconnected, VC enters high-Z hold mode. |
| CTRL1–CTRL3 | Current sense threshold control | Sets VSENSE = min(CTRL, 1V)/10 (if CTRL < 1V) or 100mV (if CTRL ≥ 1V) - enables analog dimming or thermal foldback. |
| TG1–TG3 | PMOS gate driver output | Drives external P-channel MOSFET gate; limited to 6.5V CAP–TG differential - protects MOSFET gate oxide during turn-on. |
| LED1–LED3 / CAP1–CAP3 | Differential current sense inputs | Connect across external sense resistor; internal EAMP regulates voltage difference to programmed threshold - defines LED current. |
| fADJ | Frequency adjustment input | Voltage 0.1V–1.5V programs switching frequency from 330kHz to 2.1MHz - optimizes efficiency vs. inductor/capacitor size. |
| OVP1–OVP3 | Open-LED protection input | Voltage >1V disables respective channel's main switch - prevents overvoltage during LED string open-circuit faults. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent constant-current channels | Each channel operates autonomously with dedicated PWM, CTRL, OVP, TG, and sense inputs - enables mixed topology (e.g., buck + boost + buck-boost) in single IC. |
| True Color PWM™ dimming | Maintains linear light output vs. duty cycle by preserving VC voltage during PWM low periods - eliminates color shift in RGB applications. |
| Built-in PMOS gate drivers | Drives external P-MOSFETs with controlled 6.5V CAP–TG limit - enables high-dimming-ratio LED disconnect without external level shifters. |
| Wide input voltage range | 3V–30V operation with 40V transient tolerance - supports direct integration into 12V/24V vehicle electrical systems without upstream converters. |
| Integrated open-LED protection | OVP pins monitor output voltage via external divider; trip at 1V threshold - isolates failed channel while others remain operational. |
Applications
| Automotive Interior Lighting | RGB Backlighting for Large Displays |
|---|---|
|
Use Scenario: Driving multi-color LED arrays in instrument clusters, ambient lighting, and center consoles with dynamic color tuning. IC Role / Device Role / Timing Role: Constant-current source with per-channel PWM and analog dimming control - regulates red, green, and blue LED currents independently. Use Value: Enables smooth, flicker-free color transitions and precise white-point calibration using 3000:1 dimming range and matched channel gain. |
Use Scenario: Powering high-brightness LED backlights in digital signage, billboards, and video walls requiring uniform luminance and color consistency. IC Role / Device Role / Timing Role: Triple-output LED driver operating in boost configuration - supplies regulated current to long LED strings from 12V input. Use Value: Delivers stable current despite varying forward voltage across temperature and aging, with open-LED fault detection preventing catastrophic failure. |
| Avionic Cabin Lighting | Industrial Machine Vision Illumination |
|
Use Scenario: Providing certified, EMI-controlled lighting in aircraft cabins where reliability, thermal robustness, and dimming linearity are critical. IC Role / Device Role / Timing Role: High-reliability LED driver with –40°C to +125°C operation and integrated thermal protection - manages LED current under wide ambient swings. Use Value: Meets DO-160 environmental requirements via robust layout guidance, exposed-pad thermal path, and undervoltage lockout below 2.4V. |
Use Scenario: Generating precisely timed, high-intensity illumination pulses for barcode readers, inspection systems, and automated optical inspection. IC Role / Device Role / Timing Role: Fast-response constant-current source with synchronized PWM inputs - triggers LED strobes with sub-microsecond edge alignment. Use Value: Achieves <110ns gate turn-on/off delay and stable current regulation during rapid on/off cycling - ensures consistent exposure intensity. |
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 |
|---|---|---|---|
| LT3496EUFD#PBF | Same die, 28-lead QFN package (4mm × 5mm); θJA = 34°C/W vs. TSSOP's 30°C/W; exposed pad soldering required. | Better thermal performance in space-constrained layouts; requires different PCB land pattern and reflow profile. | Select for higher power density or improved thermal dissipation where board area permits QFN mounting. |
| LT3496IFE#TRPBF | Identical functionality and package; supplied in tape-and-reel format (2,500 pcs/reel) vs. tube-packaged LT3496IFE#PBF (75 pcs/tube). | No functional difference; optimized for automated SMT assembly rather than prototyping or low-volume use. | Choose for high-volume production to reduce placement cost and eliminate manual tube handling. |
Compared with LT3496EUFD#PBF, the LT3496IFE#PBF offers lower thermal resistance to ambient but requires larger PCB real estate; compared with LT3496IFE#TRPBF, it provides identical electrical performance in a tube format suited for engineering validation and small-batch builds.
Availability
LT3496IFE#PBF is available at Aetrix Electronics and suitable for automotive lighting, large-display backlighting, and avionic cabin illumination requiring stable component supply, extended temperature qualification, and long-term lifecycle support.
Supply support for LT3496IFE#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, documentation, and manufacturing continuity for the LT3496 family.
The LT3496 belongs to Linear's high-performance LED driver product line, designed specifically for multi-channel, high-dimming-ratio RGB and white LED systems in automotive, aerospace, and professional display applications.
FAQ
What is the maximum LED string voltage the LT3496IFE#PBF can drive in boost mode?
The LT3496IFE#PBF supports up to 45V at SWx, CAPx, and LEDx pins. In boost configuration, output voltage is limited by external component ratings and layout parasitics - practical designs achieve ≥40V output with proper Schottky diode (e.g., DFLS160) and capacitor selection. The LT3496IFE#PBF itself does not regulate output voltage directly; it regulates current through the sense resistor while the boost topology determines final string voltage.
Can the LT3496IFE#PBF operate with only one or two channels active?
Yes. Each channel is fully independent: unused PWMx pins must be tied to VREF (2V), and unused TGx pins left open. CTRLx, OVPx, and VCx pins should be terminated per datasheet guidance (e.g., OVPx to GND if unused). The LT3496IFE#PBF draws only 6mA quiescent current per active channel and 0.1µA in full shutdown - enabling flexible channel utilization without penalty.
How does the LT3496IFE#PBF implement overtemperature protection?
The LT3496IFE#PBF includes junction-temperature-dependent thermal shutdown that disables all channels when die temperature exceeds ~160°C. This is distinct from the CTRL-pin-based overtemperature protection, which uses external PTC thermistors to dynamically reduce LED current before thermal shutdown occurs. Both mechanisms protect the LT3496IFE#PBF and connected LEDs - the former prevents permanent damage, the latter maintains safe operating area during sustained high ambient conditions.
What is the purpose of the exposed pad on the LT3496IFE#PBF TSSOP package?
The exposed pad (Pin 29) is electrically and thermally connected to GND. It must be soldered to a PCB ground plane with ≥4 thermal vias to achieve specified θJA = 30°C/W and prevent thermal runaway. Failure to connect the pad degrades thermal performance by >40%, risks exceeding 125°C junction temperature, and voids guaranteed operation across the –40°C to +125°C range - a requirement explicitly stated in the LT3496IFE#PBF datasheet.
Does the LT3496IFE#PBF support synchronization of switching frequency across multiple ICs?
No. The LT3496IFE#PBF lacks an external clock sync input; its oscillator is internally generated and adjustable only via the fADJ pin voltage. For multi-IC systems requiring EMI reduction, designers must stagger fADJ voltages slightly between units or accept asynchronous operation. However, PWM1–PWM3 inputs *must* be synchronized externally to maintain color fidelity in RGB applications - this is separate from switching frequency alignment and is fully supported by the LT3496IFE#PBF architecture.
LT3496IFE#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:
- 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:
- 1A (Switch)
- Frequency:
- 330kHz ~ 2.1MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3496IFE#PBF FAQ
1.How can I place an order for LT3496IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3496IFE#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 LT3496IFE#PBF reliable?
The price and inventory of LT3496IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3496IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3496IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3496IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3496IFE#PBF?
LT3496IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3496IFE#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 LT3496IFE#PBF?
For technical support, including LT3496IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3496IFE#PBF requirements.
6.How does Aetrix verify that LT3496IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3496IFE#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 LT3496IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3496IFE#PBF?
All LT3496IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3496IFE#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 LT3496IFE#PBF part is unused and in its original packaging.
Return procedure for LT3496IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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