My Inquiry
My Account
Analog Devices Inc. LT3496EUFD#TRPBF
- Part No.:
- LT3496EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3496EUFD#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR PWM 1A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:425
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3496EUFD#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 independent PWM dimming per channel. It integrates three 750mA, 45V NPN switches and built-in P-channel MOSFET gate drivers for LED disconnect, supporting up to 3000:1 True Color PWM dimming at 120Hz in RGB lighting systems.
For engineers reviewing the LT3496EUFD#TRPBF datasheet, LT3496EUFD#TRPBF pinout, LT3496EUFD#TRPBF application, or LT3496EUFD#TRPBF equivalent, key selection criteria include its 3-channel independent current regulation, 330kHz–2.1MHz adjustable switching frequency, 3V–30V input range, open-LED protection per channel, and thermal performance in automotive display backlighting and large-format signage.
Technical Context
The LT3496EUFD#TRPBF employs fixed-frequency current-mode control with shared oscillator, ramp generator, and reference across three replicated converter channels. Each channel features independent PWM inputs, dedicated CTRL pins for analog current threshold setting (10mV–100mV), and OVP pins for open-LED fault detection.
Its architecture supports flexible topology configuration per channel via external component selection-inductor, diode, and sense resistor placement determine buck/boost/buck-boost operation. Gate drivers (TG1–TG3) deliver regulated 5.5V–7.5V turn-on voltage relative to CAPx, with 110ns turn-on/off delay and 6.5V max CAP–TG differential to protect external PMOS devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | Three independent constant-current regulators, each with dedicated PWM, CTRL, OVP, TG, CAP, LED, SW, VC pins. |
| Switch Current Limit | 750mA typical per channel (1000mA max), enabling direct drive of mid-power LEDs without external switching transistors. |
| Dimming Ratio | 3000:1 True Color PWM dimming per channel at 120Hz, preserving color fidelity in RGB mixing applications. |
| Input Voltage Range | 3V to 30V continuous operation; transient-rated to 40V for 1 second-supports 12V/24V automotive and industrial rails. |
| Switching Frequency | Adjustable from 330kHz to 2.1MHz via fADJ pin voltage; higher frequencies reduce inductor/capacitor size, lower frequencies improve efficiency at extreme duty cycles. |
| Current Sense Threshold | Programmable from 10mV to 100mV via CTRL pins; enables precise LED current setting (e.g., 100mA with 1Ω sense resistor at 100mV). |
| Package Thermal Resistance | θJA = 34°C/W, θJC = 2.7°C/W (QFN-28); exposed pad must be soldered to PCB ground plane for thermal integrity. |
Pinout & Package
LT3496EUFD#TRPBF is housed in a 28-lead (4mm × 5mm) plastic QFN package with exposed thermal pad (Pin 29 = GND). The package supports high-density layout and efficient heat dissipation when the exposed pad is fully soldered to a multilayer PCB ground plane using ≥6 thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 3V–30V supply; requires local 1µF ceramic bypass capacitor; protected by 2.4V UVLO. |
| SHDN | Global shutdown control | Logic-high (>1.5V) enables all three channels; logic-low (<0.4V) disables regulators and reduces quiescent current to ≤10µA. |
| PWM1–PWM3 | Per-channel PWM dimming inputs | High = enable channel operation; low = disable switch, disconnect LED via TG driver, and place VC pin in high-Z state for linear dimming hold. |
| CTRL1–CTRL3 | Current sense threshold programming | Sets LED current sense voltage: ≤1V → 1/10×CTRL value; >1V → fixed 100mV; enables analog dimming or overtemperature protection with PTC. |
| TG1–TG3 | P-channel MOSFET gate drivers | Drives external PMOS disconnect switch; CAPx–TGx limited to 6.5V; 110ns turn-on/off delay ensures fast dimming transitions. |
| CAP1–CAP3 / LED1–LED3 | Differential current sense inputs | Connect across external sense resistor; VCAPx–LEDx regulated to CTRL-derived threshold for accurate constant-current control. |
| SW1–SW3 | Internal NPN switch collectors | Drive external inductor/diode; minimize trace area to reduce EMI; rated for 45V max voltage and 750mA peak current. |
| fADJ | Frequency adjustment input | Voltage <1V sets frequency from 330kHz–2.1MHz; >1V defaults to 2.1MHz; enables soft-start when filtered from VREF. |
| OVP1–OVP3 | Open-LED protection inputs | Voltage >1V disables respective channel's switch; ties to GND if unused; prevents overvoltage during LED string failure. |
| VREF | 2.0V precision reference output | Supplies up to 200µA; used for biasing CTRL/OVP/fADJ networks and external circuitry requiring stable reference. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent current regulation | Enables simultaneous, mismatch-tolerant driving of RGB LED strings with separate brightness/color control per channel. |
| True Color PWM™ dimming | Maintains consistent LED forward voltage and spectral output across 3000:1 intensity range-critical for color-accurate displays. |
| Built-in PMOS gate drivers (TG1–TG3) | Eliminates need for external level-shifters; provides controlled 5.5V–7.5V gate drive relative to CAPx, protecting PMOS gate oxide. |
| Open-LED protection per channel | Independent OVP1–OVP3 inputs allow one failed LED string to shut down while others remain operational-improving system reliability. |
| Adjustable switching frequency (330kHz–2.1MHz) | Allows optimization of magnetic component size vs. efficiency trade-off; higher frequencies enable compact 10µH–15µH inductors. |
| Wide input voltage range (3V–30V) | Supports direct connection to unregulated 12V/24V vehicle batteries and industrial supplies without pre-regulation stage. |
Applications
| Automotive Interior Lighting | RGB Backlighting for Large Displays |
|---|---|
|
Use Scenario: Driving red/green/blue LED strings behind instrument clusters and ambient lighting panels in vehicles. IC Role / Device Role / Timing Role: Constant-current source with independent PWM dimming per channel to maintain color point accuracy under varying battery voltage (9V–16V) and temperature. Use Value: 3000:1 dimming range preserves visibility in daylight and nighttime conditions without color shift; open-LED protection prevents total backlight failure. |
Use Scenario: Powering high-brightness RGB LED arrays in digital billboards and stadium displays. IC Role / Device Role / Timing Role: Triple-output buck-boost regulator delivering stable 100mA–750mA per channel across wide input (12V–30V) and output voltage (5V–42V) ranges. Use Value: Independent channel control enables dynamic white-point tuning and localized dimming zones; 45V switch rating supports long LED strings. |
| Avionic Cabin Lighting | Industrial Human-Machine Interface (HMI) |
|
Use Scenario: Controlling multi-color status indicators and mood lighting in aircraft cabins with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: High-efficiency LED driver with low-noise current-mode control and minimized SW node area to meet DO-160E radiated emissions limits. Use Value: 34°C/W θJA and exposed-pad thermal design enables operation at 85°C ambient without derating; 2.1MHz option reduces filter component size. |
Use Scenario: Illuminating tactile buttons and status LEDs on factory-floor HMIs exposed to vibration, dust, and wide temperature swings. IC Role / Device Role / Timing Role: Robust constant-current driver with –40°C to 125°C operating junction range and undervoltage lockout preventing erratic behavior during brownouts. Use Value: Built-in UVLO (2.4V) and overtemperature protection via CTRL/PTC interface ensure fail-safe operation in harsh environments. |
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 |
|---|---|---|---|
| LT3466IUFD#TRPBF | Single-channel, 1.5A switch; no integrated PMOS gate drivers; 200kHz–2MHz frequency range. | Lacks multi-channel independence and True Color PWM; suitable only for single-string high-current designs. | Select LT3496EUFD#TRPBF when RGB color mixing, per-channel dimming, or LED disconnect capability is required. |
| TPS61165DRVR | Single-channel, 40V boost LED driver; 1.2MHz fixed frequency; no CTRL pin for analog dimming; no OVP inputs. | No multi-channel support or open-LED protection; limited to boost-only topology with 1000:1 dimming. | Choose LT3496EUFD#TRPBF for systems needing three independent, topology-flexible, fault-tolerant LED outputs. |
Compared with LT3466IUFD#TRPBF and TPS61165DRVR, the LT3496EUFD#TRPBF uniquely delivers synchronized triple-channel operation with programmable dimming, integrated gate drivers, and per-channel fault management-enabling compact, reliable RGB lighting without external supervision logic.
Availability
LT3496EUFD#TRPBF is available at Aetrix Electronics and suitable for automotive interior lighting, RGB backlighting for large displays, avionic cabin lighting, and industrial HMI applications requiring stable component supply, extended temperature operation, and long-term production continuity.
Supply support for LT3496EUFD#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 full technical and manufacturing continuity for the LT® product family, known for high-performance analog and power management ICs targeting demanding industrial and automotive applications.
The LT3496EUFD#TRPBF belongs to Linear's high-reliability LED driver product line, engineered specifically for multi-channel, high-dimming-ratio solid-state lighting in safety-critical and thermally constrained environments.
FAQ
What is the maximum LED string voltage supported by the LT3496EUFD#TRPBF?
The LT3496EUFD#TRPBF supports output voltages up to 45V at CAP1/CAP2/CAP3 pins, enabling driving of LED strings with combined forward voltages up to ~42V (accounting for sense resistor and diode drops). This allows configurations such as 10× white LEDs (3.2V each) in series per channel when used in boost mode.
Can the LT3496EUFD#TRPBF operate in buck, boost, and buck-boost modes simultaneously across its three channels?
Yes-the LT3496EUFD#TRPBF supports independent topology selection per channel. Channel 1 may be configured as buck, Channel 2 as boost, and Channel 3 as buck-boost by appropriate external component placement (inductor, diode, feedback network), as confirmed in the Typical Applications section of the datasheet.
How does the CTRL pin function in overtemperature protection for the LT3496EUFD#TRPBF?
The CTRL pin on the LT3496EUFD#TRPBF can be connected to a PTC thermistor network (e.g., 5kΩ PTC + 50kΩ pull-up to VREF) so that rising temperature increases CTRL voltage, thereby reducing the regulated current sense threshold and lowering LED current-preventing thermal runaway without external circuitry.
What is the purpose of the exposed thermal pad (Pin 29) on the LT3496EUFD#TRPBF QFN package?
The exposed pad on the LT3496EUFD#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane with ≥6 thermal vias to achieve the specified θJC = 2.7°C/W and prevent junction temperature exceedance under full load at elevated ambient temperatures.
Does the LT3496EUFD#TRPBF require external compensation components for stable operation?
Yes-the LT3496EUFD#TRPBF requires an RC network (e.g., 10kΩ + 100pF) connected from each VC1/VC2/VC3 pin to GND to stabilize the current-mode control loop. The compensation values affect dimming linearity, start-up time, and transient response, and must be tuned per application per the Applications Information section.
LT3496EUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN 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-QFN (4x5)
LT3496EUFD#TRPBF FAQ
1.How can I place an order for LT3496EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3496EUFD#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 LT3496EUFD#TRPBF reliable?
The price and inventory of LT3496EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3496EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3496EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3496EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3496EUFD#TRPBF?
LT3496EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3496EUFD#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 LT3496EUFD#TRPBF?
For technical support, including LT3496EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3496EUFD#TRPBF requirements.
6.How does Aetrix verify that LT3496EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3496EUFD#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 LT3496EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3496EUFD#TRPBF?
All LT3496EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3496EUFD#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 LT3496EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LT3496EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3496EUFD#TRPBF Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
