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Analog Devices Inc. LT3496EFE#TRPBF
- Part No.:
- LT3496EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3496EFE#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 1A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,571
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Product details
Overview
LT3496EFE#TRPBF from Analog Devices (formerly Linear Technology) is a triple-output, constant-current DC/DC LED driver IC with independent PWM-controlled buck/boost/buck-boost operation per channel, 750mA internal NPN switches, 3000:1 True Color PWM dimming, and 3V–30V input range - deployed in RGB lighting systems requiring precise color mixing and high dynamic range.
For engineers reviewing the LT3496EFE#TRPBF datasheet, LT3496EFE#TRPBF pinout, LT3496EFE#TRPBF application, or LT3496EFE#TRPBF equivalent, key selection criteria include per-channel analog/digital dimming control via CTRL/PWM pins, built-in PMOS gate drivers for LED disconnect, open-LED protection on all three outputs, and adjustable 330kHz–2.1MHz switching frequency to balance efficiency vs. component size.
Technical Context
The LT3496EFE#TRPBF implements fixed-frequency current-mode control across three fully independent channels, each with dedicated NPN power switch (750mA rating), error amplifier (VCx), PWM comparator, and gate driver for external P-channel MOSFETs (TGx). Shared oscillator, reference (2.0V VREF), UVLO, and bias circuitry reduce inter-channel coupling while enabling synchronized PWM dimming.
Each channel regulates LED current by sensing voltage across an external sense resistor (CAPx–LEDx), with current threshold set either at 100mV (CTRL ≥ 1V) or 1/10 × CTRL voltage (CTRL < 1V); OVPx pins provide open-LED fault detection by monitoring output voltage against a 1V internal reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3V to 30V continuous; transient-rated to 40V - supports wide-input industrial and automotive LED supplies without external pre-regulation. |
| Switch Current Limit | 750mA typical per channel - enables direct driving of medium-power LED strings without external switching transistors. |
| PWM Dimming Ratio | 3000:1 at 120Hz - delivers linear light output over full range for high-fidelity color mixing in RGB signage and displays. |
| Switching Frequency | Adjustable 330kHz–2.1MHz via fADJ pin - allows optimization of inductor/capacitor size and efficiency for buck, boost, or buck-boost topologies. |
| Current Sense Threshold | Programmable 10mV–100mV via CTRL pins - provides precise analog dimming and overtemperature protection using thermistor networks. |
| Open-LED Protection | Dedicated OVP1/OVP2/OVP3 pins with 1V threshold - disables individual channel if LED string opens, preserving operation of remaining two channels. |
| Package | 28-lead TSSOP (4mm × 5mm), exposed pad grounded - delivers thermal performance (θJC = 10°C/W) suitable for sustained 750mA operation. |
Pinout & Package
LT3496EFE#TRPBF is housed in a 28-lead plastic TSSOP package (FE grade) with exposed pad (Pin 29) soldered to PCB ground for thermal and electrical integrity. Pin count, layout, and thermal metrics match the LT3496EFE#PBF variant; tape-and-reel packaging (TRPBF) enables automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN | Global shutdown control | Logic-high (>1.5V) enables all three regulators; logic-low (<0.4V) reduces quiescent current to 0.1µA and disables switching. |
| PWM1–PWM3 | Per-channel PWM enable inputs | High state activates respective converter and gate driver; low state disconnects LED string via TGx and places VCx in high-Z mode for seamless dimming. |
| CTRL1–CTRL3 | Analog current set inputs | Set LED current sense threshold: ≤1V yields 1/10×CTRL value; >1V defaults to 100mV - enables analog dimming or thermal foldback. |
| TG1–TG3 | P-channel MOSFET gate drivers | Drive external PMOS between CAPx and LEDx; clamp CAPx–TGx to 6.5V max to protect MOSFET gate oxide. |
| CAP1–CAP3 / LED1–LED3 | Current sense differential inputs | Connect across external sense resistor; regulate current by maintaining VCAPx–LEDx at programmed threshold (10–100mV). |
| fADJ | Frequency adjustment input | Voltage <1V scales switching frequency down to 330kHz; ≥1V sets default 2.1MHz - tunes EMI profile and passive component sizing. |
| OVP1–OVP3 | Open-LED fault monitor inputs | Monitor output voltage divider; >1V disables respective channel's main switch while others remain active - improves system robustness. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent constant-current regulators | Enables simultaneous RGB drive with no cross-regulation - critical for stable white-point maintenance in color-critical lighting. |
| True Color PWM™ dimming | Preserves LED spectral characteristics across 3000:1 range by avoiding low-frequency current modulation artifacts. |
| Built-in PMOS gate drivers (TG1–TG3) | Eliminates need for external level-shifters or discrete drivers - simplifies bill-of-materials and PCB layout for high-dimming-ratio designs. |
| Adjustable 330kHz–2.1MHz switching frequency | Allows trade-off between inductor size (higher fSW → smaller L) and conduction losses (lower fSW → higher efficiency at high duty cycles). |
| Per-channel open-LED protection (OVP1–OVP3) | Prevents overvoltage damage to LEDs and driver during single-string failure - maintains partial illumination in multi-string arrays. |
| Wide 3V–30V input operating range | Supports direct connection to 12V/24V industrial rails and automotive batteries (with transient clamping), reducing need for upstream converters. |
Applications
| RGB Signage & Billboards | Automotive Interior Lighting |
|---|---|
Use Scenario: Outdoor digital signage with large-area RGB LED modules requiring uniform brightness and accurate color reproduction under variable ambient temperature. IC Role / Device Role / Timing Role: Triple-output constant-current source with synchronized PWM dimming and per-channel thermal compensation via CTRL pins. Use Value: 3000:1 dimming preserves contrast ratio in daylight; independent channel control enables real-time white-point calibration without affecting adjacent pixels. |
Use Scenario: Dashboard backlighting and ambient mood lighting in vehicles where EMI compliance, thermal reliability, and startup behavior under cold-crank conditions are critical. IC Role / Device Role / Timing Role: High-efficiency buck-boost LED driver supporting 6V–16V battery input with undervoltage lockout (2.4V) and junction temperature monitoring. Use Value: 30V transient rating withstands load-dump events; exposed-pad TSSOP package sustains 125°C junction temperature during prolonged cabin heat exposure. |
| Aircraft Cabin Lighting | Industrial Machine Vision Illumination |
Use Scenario: FAA-certified cabin lighting systems requiring DO-160-compliant EMI performance, extended temperature operation (–40°C to 125°C), and fault-isolated LED control. IC Role / Device Role / Timing Role: Triple-channel driver with open-LED protection and independent shutdown per channel to meet redundancy requirements. Use Value: OVP1–OVP3 disable only failed channel - maintains illumination in adjacent zones; 28-lead TSSOP meets aerospace vibration and reliability standards. |
Use Scenario: High-speed inspection systems using pulsed LED strobes synchronized to camera exposure, demanding precise current accuracy and fast turn-on/turn-off response. IC Role / Device Role / Timing Role: Constant-current source with sub-110ns gate turn-on/off delay and programmable frequency for timing-critical strobe control. Use Value: Gate drivers (TG1–TG3) achieve <110ns transition times into 300pF loads - enables microsecond-level LED pulse width control for motion-blur-free imaging. |
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#TRPBF | Same silicon die in 4mm × 5mm QFN package; θJC = 2.7°C/W vs. TSSOP's 10°C/W - superior thermal performance for high-density layouts. | Preferred for space-constrained PCBs requiring higher power density and lower junction temperature rise. | Select EUFD for thermal-limited designs; verify PCB land pattern and reflow profile compatibility with QFN footprint. |
| LT3761EFE#TRPBF | Single-channel 3A LED controller with external MOSFET drive; no integrated switches or multi-channel PWM sync capability. | Suitable for high-current monochrome LED strings but lacks native RGB coordination or per-channel dimming independence. | Choose only when scaling beyond 750mA/channel or requiring >45V LED string voltage - not a functional replacement for triple-channel operation. |
Compared with LT3496EFE#TRPBF, the LT3496EUFD#TRPBF offers better thermal dissipation in compact form factor but requires QFN-specific layout and assembly; the LT3761EFE#TRPBF provides higher per-channel current capability but eliminates integrated triple-channel synchronization and True Color PWM functionality.
Availability
LT3496EFE#TRPBF is available at Aetrix Electronics and suitable for RGB signage, automotive interior lighting, and aircraft cabin lighting requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-critical applications.
Supply support for LT3496EFE#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 precision analog and power management product lines with full technical documentation, reference designs, and long-term manufacturing commitment.
The LT3496 product line was designed specifically for high-fidelity, multi-color LED lighting systems demanding independent channel control, ultra-wide dimming range, and robust fault protection - targeting display, transportation, and industrial visual applications.
FAQ
What is the maximum continuous input voltage rating for the LT3496EFE#TRPBF?
The LT3496EFE#TRPBF has a maximum continuous input voltage rating of 30V on the VIN pin. It also supports nonrepetitive 40V transients for up to one second, making it suitable for automotive and industrial environments with load-dump or surge events. Operation above 30V continuously may cause permanent damage or degraded reliability.
Does the LT3496EFE#TRPBF support buck, boost, and buck-boost topologies simultaneously across its three channels?
Yes - the LT3496EFE#TRPBF supports independent topology selection per channel: each of the three regulators can be configured as buck, boost, or buck-boost by external component choice (inductor, diode, capacitor placement). The internal 750mA NPN switch and gate driver (TGx) are topology-agnostic and adapt to the selected configuration.
How does the CTRL pin function in the LT3496EFE#TRPBF, and what is its voltage range?
The CTRL pin on the LT3496EFE#TRPBF sets the LED current sense threshold: when CTRL voltage is below 1V, the threshold equals 1/10 × CTRL voltage (e.g., 0.5V → 50mV); above 1V, it defaults to 100mV. Valid operating range is 0.1V to 2.5V, with input bias current ≤100nA - enabling precise analog dimming or thermal foldback using resistive networks or PTC thermistors.
Can the LT3496EFE#TRPBF operate with only two active channels while the third is disabled?
Yes - the LT3496EFE#TRPBF allows independent channel enable/disable via PWM1–PWM3. Driving any PWM pin low disables that channel's switch, gate driver, and error amplifier (VCx goes high-Z), drawing only ~1µA quiescent current from that channel. Other channels continue full regulation and dimming control without interference.
What is the purpose of the exposed pad (Pin 29) on the LT3496EFE#TRPBF TSSOP package?
The exposed pad (Pin 29) on the LT3496EFE#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane with multiple thermal vias to achieve specified θJC = 10°C/W and ensure reliable operation at full 750mA per channel. Leaving it unconnected degrades thermal performance and risks junction overheating.
LT3496EFE#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:
- 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
LT3496EFE#TRPBF FAQ
1.How can I place an order for LT3496EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3496EFE#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 LT3496EFE#TRPBF reliable?
The price and inventory of LT3496EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3496EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3496EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3496EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3496EFE#TRPBF?
LT3496EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3496EFE#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 LT3496EFE#TRPBF?
For technical support, including LT3496EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3496EFE#TRPBF requirements.
6.How does Aetrix verify that LT3496EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3496EFE#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 LT3496EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3496EFE#TRPBF?
All LT3496EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3496EFE#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 LT3496EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3496EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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