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Analog Devices Inc. LT3932EUFD-1#TRPBF
- Part No.:
- LT3932EUFD-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3932EUFD-1#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR PWM 2A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,249
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Product details
Overview
LT3932EUFD-1#TRPBF from Analog Devices is a 36V, 2A synchronous step-down LED driver with integrated PWM dimming control, ±1.5% LED current regulation, and AEC-Q100 qualification for automotive lighting. It supports 200kHz–2MHz programmable switching frequency, 5000:1 external PWM dimming at 100Hz, and operates from 3.6V to 36V input across –40°C to 125°C junction temperature.
For engineers reviewing the LT3932EUFD-1#TRPBF datasheet, LT3932EUFD-1#TRPBF pinout, LT3932EUFD-1#TRPBF application, or LT3932EUFD-1#TRPBF equivalent, key selection criteria include internal PWM dimming capability (128:1), open/short LED fault reporting, spread-spectrum EMI reduction, and compatibility with high-side PMOS dimming switches in thermally constrained automotive headlamp designs.
Technical Context
The LT3932EUFD-1#TRPBF implements fixed-frequency peak-current-mode control with dual power switches and Silent Switcher® architecture to minimize conducted and radiated EMI. Its current regulation loop uses a transconductance amplifier (gm = 200 µA/V) referenced to ISP/ISN sense voltage, while voltage regulation employs a separate 480 µA/V error amplifier monitoring FB.
It integrates an internal PWM signal generator (7.8 kHz typical with RP = 28.7 kΩ), supports external SYNC clock override, and features dedicated PWMTG output driving external high-side PMOS for precise LED current blanking-enabling high-dynamic-range dimming without LED current ripple during off-cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports wide automotive battery range including cold-crank (6V) and load-dump (36V) conditions. |
| Max Output Current | 2A - delivers sufficient drive for multi-LED strings in headlamps and DRLs without external current boost. |
| LED Current Accuracy | ±1.5% - ensures consistent luminance across production units and temperature (-40°C to 125°C). |
| Dimming Ratio | 5000:1 (external PWM), 128:1 (internal PWM) - enables fine-grained brightness control for adaptive driving beam (ADB) systems. |
| Switching Frequency | 200kHz to 2MHz - allows optimization of inductor size vs. efficiency; supports spread-spectrum modulation via SYNC/SPRD pin. |
| Fault Protection | Open-circuit (FB > 950mV) and short-circuit (FB < 200mV) detection with open-drain FAULT pin - provides fail-safe diagnostics for ASIL-B compliant lighting modules. |
| Package | 28-pin (4mm × 5mm) QFN with exposed thermal pad - achieves θJA = 25°C/W on DC2286A evaluation board for high-power density layout. |
Pinout & Package
LT3932EUFD-1#TRPBF is housed in a thermally enhanced 28-lead (4mm × 5mm) plastic QFN package with exposed GND pad (Pin 29), rated for –40°C to 125°C operating junction temperature and AEC-Q100 qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 2, 4, 5, 14) | Input Power Supply | Supplies analog circuitry and high-side switch; requires local 2.2µF ceramic bypass to GND per pin for low-impedance path during high di/dt events. |
| ISP / ISN (Pins 6, 7) | Current Sense Inputs | Differential inputs to 200 µA/V transconductance amplifier; sense resistor placed in LED cathode path for accurate current feedback. |
| CTRL (Pin 15) | LED Current Programming | Accepts 250mV–1.25V analog voltage or 100kHz–1MHz digital pulse (12.5%–62.5% duty) to set regulated LED current. |
| PWM / RP / PWMTG (Pins 22, 9, 12) | Internal/External Dimming Control | PWM pin accepts 1V–2V DC for internal PWM generation; RP sets frequency; PWMTG drives external high-side PMOS gate directly. |
| FB (Pin 4) | Output Voltage Limit Feedback | Monitors LED string voltage via resistor divider; triggers overvoltage lockout at 1.05V and fault reporting at <200mV (short) or >950mV (open). |
| FAULT (Pin 8) | Open/Short Fault Indicator | Open-drain output pulled low during LED open-circuit or short-circuit conditions; requires 100kΩ pull-up to INTVCC. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Minimizes EMI emissions via balanced PCB layout and integrated hot-loop capacitor routing-reduces need for shielding or ferrites in automotive EMC testing. |
| Integrated PWM Dimming Generator | Provides 7.8 kHz internal PWM (RP = 28.7 kΩ) with ±10% accuracy across temperature-eliminates need for external timing IC in cost-sensitive headlamp modules. |
| Accurate LED Current Monitor (ISMON) | Delivers 10 mV per 1 mV ISP–ISN differential-enables real-time current telemetry for closed-loop luminance calibration without additional ADC. |
| Programmable UVLO Threshold | EN/UVLO pin has 1.15 V rising threshold with 20 mV hysteresis-allows custom brown-out protection using resistor divider from VIN to ensure stable startup under battery sag. |
| Thermal Shutdown & Fault Recovery | Includes thermal shutdown and configurable hiccup/latch-off response via SS pin resistor-supports robust operation in sealed headlamp enclosures with limited airflow. |
Applications
| Automotive Headlamps | Industrial Machine Vision Lighting |
|---|---|
Use Scenario: Adaptive front-lighting system (AFS) requiring dynamic beam shaping and glare-free high-beam assist. IC Role / Device Role / Timing Role: Primary LED current controller with synchronized PWM dimming for pixel-level intensity control across multiple LED segments. Use Value: Enables 5000:1 external PWM dimming at 100Hz and ±1.5% current regulation-critical for meeting UNECE R149 photometric uniformity requirements. | Use Scenario: High-speed inspection systems requiring strobed illumination synchronized to camera exposure timing. IC Role / Device Role / Timing Role: Constant-current LED driver with sub-microsecond PWM propagation delay (100ns turn-on/off) for precise flash timing. Use Value: PWMTG output drives external PMOS with 10V gate drive swing-ensures fast, jitter-free LED turn-on for 100+ fps imaging without motion blur. |
| Automotive Daytime Running Lights (DRL) | Commercial Architectural Lighting |
Use Scenario: Energy-efficient, thermally robust DRL module operating continuously at ambient temperatures up to 105°C. IC Role / Device Role / Timing Role: Synchronous buck LED driver with integrated thermal shutdown and AEC-Q100 qualification for under-hood placement. Use Value: 28-pin QFN package with exposed thermal pad achieves 25°C/W θJA-maintains safe junction temperature without heatsink in compact housing. | Use Scenario: DALI- or 0–10V-controlled linear LED fixtures requiring smooth analog dimming and fault diagnostics. IC Role / Device Role / Timing Role: LED current regulator interfacing with external DAC or microcontroller via CTRL pin for analog dimming. Use Value: 20:1 analog dimming range (250mV–1.25V CTRL) with ±1.5% accuracy-delivers flicker-free dimming down to 5% output without color shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3932EUFD#TRPBF | Lacks -1 suffix; supports only 1000:1 external PWM dimming (vs. 5000:1 in LT3932EUFD-1#TRPBF); identical pinout and package. | Not suitable for ADB or high-contrast machine vision where >1000:1 dimming is required. | Select LT3932EUFD-1#TRPBF when >1000:1 dimming ratio or higher internal PWM accuracy is mandatory. |
| LM3409QMY/NOPB | Non-synchronous buck; no integrated PWM generator; max 1.5A output; no spread-spectrum EMI reduction. | Lower EMI performance; requires external MOSFET and PWM controller; not AEC-Q100 qualified. | Choose only for cost-sensitive non-automotive applications where dimming ratio <1000:1 and EMI limits are relaxed. |
Compared with LT3932EUFD#TRPBF and LM3409QMY/NOPB, the LT3932EUFD-1#TRPBF uniquely combines AEC-Q100 qualification, 5000:1 PWM dimming, Silent Switcher® EMI suppression, and integrated PWM generation-making it the only drop-in solution for ASIL-B-compliant adaptive automotive lighting.
Availability
LT3932EUFD-1#TRPBF is available at Aetrix Electronics and suitable for automotive headlamps, industrial machine vision systems, and commercial architectural lighting requiring stable component supply, AEC-Q100 compliance, and high-accuracy LED current regulation.
Supply support for LT3932EUFD-1#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT3932EUFD-1#TRPBF belongs to Analog Devices' Silent Switcher® LED driver product line, engineered specifically for automotive-grade, low-EMI, high-dynamic-range lighting applications demanding precision current regulation and robust fault handling.
FAQ
What is the maximum LED string voltage supported by the LT3932EUFD-1#TRPBF?
The LT3932EUFD-1#TRPBF supports 0V to 36V LED string voltage, enabling direct drive of long LED strings (e.g., 10–12 white LEDs in series) without intermediate voltage translation. This range accommodates forward voltage variations across temperature and binning while maintaining regulation via the FB pin's 1V reference and overvoltage protection threshold at 1.05V.
Does the LT3932EUFD-1#TRPBF require an external PMOS for PWM dimming?
No-the LT3932EUFD-1#TRPBF includes both internal PWM generation and a dedicated PWMTG output pin capable of directly driving the gate of an external high-side PMOS. While the internal PWM supports 128:1 dimming, using the PWMTG output with an external PMOS enables 5000:1 external PWM dimming at 100Hz, making the LT3932EUFD-1#TRPBF flexible for both simple and high-fidelity lighting architectures.
How does the LT3932EUFD-1#TRPBF achieve AEC-Q100 qualification?
The LT3932EUFD-1#TRPBF achieves AEC-Q100 qualification through rigorous stress testing-including temperature cycling, HTOL (high-temperature operating life), and ESD-across its full –40°C to 125°C operating junction temperature range. Its design incorporates robust EN/UVLO thresholds (1.15V ±60mV), thermal shutdown, and fault reporting-all verified per AEC-Q100 Rev H requirements for automotive Grade 1 components.
Can the LT3932EUFD-1#TRPBF operate with a 24V nominal automotive input?
Yes-the LT3932EUFD-1#TRPBF operates across 3.6V to 36V input, fully covering 24V nominal systems including transient conditions like load dump (up to 36V) and cold crank (down to ~6V). Its EN/UVLO pin allows programmable undervoltage lockout, and the 2A continuous output sustains full LED current even at minimum input, ensuring reliable operation in heavy-duty truck and bus lighting applications.
What is the purpose of the RP pin on the LT3932EUFD-1#TRPBF?
The RP pin on the LT3932EUFD-1#TRPBF sets the frequency of the internal PWM dimming signal. With RP = 28.7 kΩ to GND, the device generates a typical 7.8 kHz PWM waveform; values from 10 kΩ to 1 MΩ adjust frequency from ~116 Hz to ~128 kHz. This eliminates need for external clock sources in analog-dimming-only designs and enables precise tuning of flicker-free dimming performance.
LT3932EUFD-1#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)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 3.6V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- -
- Current - Output / Channel:
- 2A
- Frequency:
- 200kHz ~ 2MHz
- Dimming:
- Analog, PWM
- Applications:
- Lighting
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LT3932EUFD-1#TRPBF FAQ
1.How can I place an order for LT3932EUFD-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3932EUFD-1#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 LT3932EUFD-1#TRPBF reliable?
The price and inventory of LT3932EUFD-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3932EUFD-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3932EUFD-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3932EUFD-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3932EUFD-1#TRPBF?
LT3932EUFD-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3932EUFD-1#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 LT3932EUFD-1#TRPBF?
For technical support, including LT3932EUFD-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3932EUFD-1#TRPBF requirements.
6.How does Aetrix verify that LT3932EUFD-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3932EUFD-1#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 LT3932EUFD-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3932EUFD-1#TRPBF?
All LT3932EUFD-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3932EUFD-1#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 LT3932EUFD-1#TRPBF part is unused and in its original packaging.
Return procedure for LT3932EUFD-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3932EUFD-1#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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