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Analog Devices Inc. LT3496IUFD#TRPBF
- Part No.:
- LT3496IUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3496IUFD#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR PWM 1A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,998
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Product details
Overview
LT3496IUFD#TRPBF from Analog Devices (formerly Linear Technology) is a triple-output, constant-current DC/DC LED driver IC with independent PWM dimming per channel, 750mA internal NPN switches, 45V switch rating, and adjustable switching frequency from 330kHz to 2.1MHz - designed for RGB backlighting and high-dynamic-range automotive lighting systems.
For engineers reviewing the LT3496IUFD#TRPBF datasheet, LT3496IUFD#TRPBF pinout, LT3496IUFD#TRPBF application, or LT3496IUFD#TRPBF equivalent, key selection criteria include its 3000:1 True Color PWM dimming ratio, built-in PMOS gate drivers for LED disconnect, open-LED protection on all three channels, and operation across 3V–30V input with transient tolerance to 40V.
Technical Context
The LT3496IUFD#TRPBF implements a fixed-frequency, current-mode control architecture shared across three independent boost/buck/buck-boost regulators. Each channel features dedicated error amplifiers (VC1–VC3), PWM comparators, and NPN power switches with 750mA current limit and 260mV VCE(SAT) at 500mA.
Control logic includes synchronized PWM inputs (PWM1–PWM3), analog current-setting via CTRL pins (10mV–100mV threshold range), OVP pins for open-LED fault detection (1V threshold), and fADJ pin-based frequency programming - enabling stable regulation across wide VIN (3–30V) and output voltage ranges while supporting up to 45V on CAP/LED/SW nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | Three independent constant-current LED drivers, each with dedicated PWM, CTRL, OVP, VC, TG, CAP, LED, and SW pins. |
| Switch Current Limit | 750mA typical per channel; enables driving high-brightness LEDs with up to 45V output compliance. |
| Dimming Ratio | 3000:1 via True Color PWM™; preserves color fidelity during deep dimming in RGB applications. |
| Switching Frequency | Adjustable 330kHz–2.1MHz via fADJ pin; balances efficiency, EMI, and external component size. |
| Input Voltage Range | 3V to 30V continuous, with 40V transient tolerance; supports 12V/24V automotive and industrial rails. |
| Current Sense Threshold | Programmable 10mV–100mV via CTRL pins; sets LED current with ±3% accuracy over temperature. |
| Package | 28-lead (4mm × 5mm) QFN with exposed thermal pad; θJA = 34°C/W, θJC = 2.7°C/W. |
Pinout & Package
LT3496IUFD#TRPBF is housed in a 28-lead plastic QFN package (4mm × 5mm) with an exposed GND pad requiring soldering to PCB for thermal and electrical integrity. Pin numbering follows standard top-view orientation with Pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power supply input | Accepts 3V–30V DC; powers internal bias circuits and UVLO; requires local 1µF ceramic bypass. |
| SHDN | Global shutdown control | Logic-high (>1.5V) enables all three channels; logic-low (<0.4V) reduces quiescent current to 0.1µA. |
| PWM1–PWM3 | Per-channel PWM dimming inputs | High enables respective converter; low disables switch, turns off TG driver, and places VC pin in high-Z state for linear dimming hold. |
| CTRL1–CTRL3 | Analog current-set reference inputs | Set LED current sense threshold: ≤1V → 1/10×CTRL voltage; >1V → fixed 100mV threshold. |
| TG1–TG3 | PMOS gate drivers | Drive external P-channel MOSFETs to disconnect LEDs during PWM low; CAP–TG limited to 6.5V for gate protection. |
| CAP1–CAP3 / LED1–LED3 | Differential current-sense inputs | Connect across external sense resistor; error amplifier regulates voltage between CAP and LED pins to CTRL-derived threshold. |
| SW1–SW3 | Internal NPN switch collectors | Connect to inductor and Schottky diode anode; handle peak currents up to 1.25A; minimize trace area to reduce EMI. |
| OVP1–OVP3 | Open-LED protection inputs | Monitor output voltage via resistor divider; >1V triggers shutdown of respective channel while others remain active. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent PWM dimming | Enables precise RGB color mixing and synchronized 3000:1 dimming without cross-channel interference. |
| Built-in PMOS gate drivers | Eliminates need for external level-shifters; allows clean LED disconnect during PWM off-time for zero-current leakage. |
| Open-LED protection per channel | Prevents overvoltage failure when one LED string opens; other two channels continue normal operation. |
| Adjustable switching frequency | 330kHz–2.1MHz tuning optimizes efficiency vs. size trade-off and avoids sensitive EMI bands. |
| Wide input voltage range | 3V–30V operation supports battery-powered, 12V automotive, and 24V industrial LED systems with 40V transient immunity. |
Applications
| Automotive Interior Lighting | RGB Backlighting for Displays |
|---|---|
Use Scenario: Dynamic ambient lighting in vehicle cabins with programmable hue, saturation, and intensity. IC Role / Device Role / Timing Role: Constant-current source for red, green, and blue LED strings; provides synchronized PWM dimming with <1% color shift across 3000:1 range. Use Value: Enables OEM-grade human-centric lighting with flicker-free dimming and thermal derating via CTRL-based overtemperature protection. | Use Scenario: High-contrast LCD backlight in medical monitors and avionics displays requiring precise white-point stability. IC Role / Device Role / Timing Role: Triple-output current regulator driving R/G/B LED arrays; uses independent CTRL pins to maintain chromaticity during brightness scaling. Use Value: Delivers consistent color gamut across luminance levels without recalibration, critical for diagnostic imaging accuracy. |
| Large-Scale Outdoor Signage | Architectural LED Accent Lighting |
Use Scenario: Billboards and stadium displays exposed to wide ambient temperature swings and line-voltage transients. IC Role / Device Role / Timing Role: Robust LED driver with 40V transient tolerance, open-LED fault isolation, and thermal foldback via PTC-coupled CTRL pins. Use Value: Ensures field reliability under harsh conditions with no single-point failure affecting full display functionality. | Use Scenario: Tunable-white architectural fixtures where correlated color temperature (CCT) must be adjusted dynamically. IC Role / Device Role / Timing Role: Independent current control per warm-white/cool-white LED string; leverages True Color PWM™ for smooth CCT transitions. Use Value: Achieves seamless, non-flickering CCT tuning from 2700K to 6500K without perceptible stepping or hue shift. |
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 |
|---|---|---|---|
| LM3492MQ-Q1 | Single-channel, 1.5A buck controller; requires external FETs and separate PWM controllers for multi-channel use. | Lacks integrated triple-channel PWM dimming and True Color PWM™; suitable only for cost-sensitive single-string designs. | Select only if system requires higher per-channel current (>750mA) and can accommodate discrete gate drivers and timing synchronization. |
| MAX20050ATP+T | Triple-channel, 500mA synchronous buck LED driver; fixed 2.2MHz frequency; no external PMOS gate drive or open-LED protection. | Lower current capability and no OVP per channel limits use in high-reliability signage or automotive applications. | Choose when board space is constrained and 500mA/channel suffices; avoid where open-circuit fault tolerance is required. |
Compared with LM3492MQ-Q1 and MAX20050ATP+T, the LT3496IUFD#TRPBF uniquely integrates 3000:1 True Color PWM™, per-channel OVP, and PMOS gate drivers in a single QFN package - delivering superior color fidelity, fault resilience, and design simplicity for multi-string LED systems.
Availability
LT3496IUFD#TRPBF is available at Aetrix Electronics and suitable for automotive interior lighting, RGB display backlighting, large-scale outdoor signage, and architectural accent lighting requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.
Supply support for LT3496IUFD#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT3496 product line was developed specifically for high-dynamic-range, multi-color LED lighting systems demanding precision current matching, deep dimming, and robust fault protection - targeting automotive, aerospace, and premium display markets.
FAQ
What is the maximum LED string voltage supported by LT3496IUFD#TRPBF?
The LT3496IUFD#TRPBF supports up to 45V on CAP1/CAP2/CAP3 and LED1/LED2/LED3 pins, enabling direct drive of multi-LED strings in boost or buck-boost configurations. With a 30V VIN and 45V switch rating, it accommodates typical 12–36V LED strings common in automotive and signage applications. The OVP pins allow external resistor dividers to set precise overvoltage thresholds per channel.
Does LT3496IUFD#TRPBF support analog dimming in addition to PWM?
Yes, the LT3496IUFD#TRPBF supports analog dimming via the CTRL1–CTRL3 pins, which adjust the current sense threshold from 10mV to 100mV. When CTRL voltage is below 1V, LED current scales linearly as ILED = VCTRL/(10 × RSENSE). This enables coarse brightness adjustment or thermal foldback when combined with a PTC thermistor, complementing fine-resolution PWM dimming.
How does the LT3496IUFD#TRPBF handle thermal overload conditions?
The LT3496IUFD#TRPBF incorporates junction-temperature monitoring that activates thermal shutdown above 150°C (H-grade) or 125°C (I-grade). During overtemperature events, the device reduces output current or shuts down channels progressively. External thermal protection can also be implemented using a PTC thermistor on the CTRL pin to lower LED current before reaching critical junction temperatures.
Can LT3496IUFD#TRPBF operate in buck, boost, and buck-boost topologies simultaneously?
Yes - each of the three channels in the LT3496IUFD#TRPBF operates independently and can be configured in buck, boost, or buck-boost mode based on external component selection. For example, Channel 1 may drive a low-VF red LED in buck mode while Channel 2 drives a high-VF blue string in boost mode, all controlled by the same IC without interaction.
What is the purpose of the exposed pad on the LT3496IUFD#TRPBF QFN package?
The exposed pad on the LT3496IUFD#TRPBF QFN package serves as the primary thermal and electrical ground connection. It must be soldered directly to a PCB ground plane with multiple thermal vias to achieve θJC = 2.7°C/W and prevent junction temperature exceedance under full load. Failure to connect the pad degrades thermal performance and may trigger premature thermal shutdown.
LT3496IUFD#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)
LT3496IUFD#TRPBF FAQ
1.How can I place an order for LT3496IUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3496IUFD#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 LT3496IUFD#TRPBF reliable?
The price and inventory of LT3496IUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3496IUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3496IUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3496IUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3496IUFD#TRPBF?
LT3496IUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3496IUFD#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 LT3496IUFD#TRPBF?
For technical support, including LT3496IUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3496IUFD#TRPBF requirements.
6.How does Aetrix verify that LT3496IUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3496IUFD#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 LT3496IUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3496IUFD#TRPBF?
All LT3496IUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3496IUFD#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 LT3496IUFD#TRPBF part is unused and in its original packaging.
Return procedure for LT3496IUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3496IUFD#TRPBF Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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