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Analog Devices Inc. LT3932IUFD-1#TRPBF
- Part No.:
- LT3932IUFD-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3932IUFD-1#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR PWM 2A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,617
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Product details
Overview
LT3932IUFD-1#TRPBF from Analog Devices is a 36V, 2A synchronous step-down LED driver with internal PWM dimming, ±1.5% LED current regulation, 5000:1 PWM dimming at 100Hz, and AEC-Q100 qualification for automotive lighting applications.
For engineers reviewing the LT3932IUFD-1#TRPBF datasheet, LT3932IUFD-1#TRPBF pinout, LT3932IUFD-1#TRPBF application, or LT3932IUFD-1#TRPBF equivalent, this page delivers verified technical context, package mapping, real-world dimming performance data, fault reporting behavior, and validated alternative options for LED current control in harsh-environment systems.
Technical Context
The LT3932IUFD-1#TRPBF implements fixed-frequency peak-current control with programmable switching frequency (200kHz–2MHz) via RT resistor or SYNC/SPRD clock input, and supports spread-spectrum modulation to reduce EMI. Its Silent Switcher® architecture minimizes radiated emissions without requiring complex layout mitigation.
It integrates dual power switches, an internal PWM signal generator (enabled by RP resistor), open/short LED fault detection with FAULT pin reporting, and analog/digital CTRL pin interface for LED current programming - with the -1 variant enabling higher dimming ratios (up to 10000:1) versus the base LT3932.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports wide-range automotive battery systems including cold-crank and load-dump transients. |
| Max LED Current | 2A - enables driving high-brightness LED strings up to 36V output voltage without external current amplification. |
| LED Current Regulation Accuracy | ±1.5% - ensures consistent luminance across temperature and line variations in safety-critical lighting. |
| PWM Dimming Ratio | 5000:1 / 10000+:1 at 100Hz - provides precise brightness control for adaptive headlights and machine vision strobes. |
| Switching Frequency Range | 200kHz to 2MHz - allows optimization of inductor size, efficiency, and EMI filtering for space-constrained PCBs. |
| Operating Junction Temp | –40°C to 125°C - qualified for under-hood automotive environments and industrial ambient conditions. |
| Package | 28-pin (4mm × 5mm) QFN with exposed thermal pad - enables efficient heat dissipation without heatsink in compact modules. |
Pinout & Package
LT3932IUFD-1#TRPBF uses a thermally enhanced 28-pin (4mm × 5mm) plastic QFN package with exposed GND pad (Pin 29), rated θJA = 25°C/W on DC2286A evaluation board. All GND pins must be soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 2, 14, 17) | Input supply and high-side switch source | Four parallel VIN pins reduce trace resistance and improve current handling for 2A continuous operation. |
| ISP / ISN (Pins 6, 5) | Differential LED current sense inputs | Accepts 0–36V common-mode voltage; enables high-side sensing with ±0.3V differential limit for accurate 2A regulation. |
| CTRL (Pin 16) | Analog/digital LED current programming | Accepts 250mV–1.25V DC or 12.5%–62.5% duty-cycle pulses to set LED current from 0% to 100%. |
| PWM / RP / PWMTG (Pins 22, 9, 13) | Internal/external PWM dimming interface | RP sets internal PWM frequency; PWM pin accepts 1V–2V for 0–100% dimming; PWMTG drives external PMOS gate. |
| FAULT (Pin 8) | Open/short LED fault indicator | Open-drain output pulled low for FB <200mV (short) or FB >950mV + ISP−ISN <10mV (open), enabling system-level fault logging. |
| FB (Pin 4) | Output voltage limit feedback | 1.000V reference threshold; used with resistor divider to clamp VOUT and prevent overvoltage damage to LED string. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces EMI/EMC emissions without shielding or ferrites - critical for automotive EMC compliance (CISPR 25 Class 5). |
| Internal PWM dimming (LT3932-1) | Enables 10000+:1 dimming ratio at 100Hz using only RP resistor and PWM pin voltage - eliminates need for external PWM generator. |
| Accurate LED current monitor (ISMON) | Provides 10mV/mV buffered output proportional to ISP−ISN - allows real-time current telemetry without additional op-amps. |
| Programmable UVLO with hysteresis | EN/UVLO threshold = 1.15V (±60mV), rising hysteresis = 20mV - prevents brown-out oscillation during battery sag in automotive start-stop systems. |
| Thermal shutdown & fault reporting | Integrated thermal protection plus open/short LED detection reported via FAULT pin - enables fail-safe operation in headlight and brake light modules. |
Applications
| Automotive Adaptive Headlights | Industrial Machine Vision Lighting |
|---|---|
Use Scenario: Dynamic beam shaping in ADAS-equipped vehicles requiring precise, flicker-free illumination across varying road conditions and ambient light. IC Role / Device Role / Timing Role: Primary LED current controller with internal PWM dimming and fault monitoring for high-reliability forward lighting. Use Value: ±1.5% current regulation and 10000:1 dimming enable pixel-level brightness control while AEC-Q100 qualification ensures operation at 125°C junction temperature. | Use Scenario: High-speed synchronized strobing of LED arrays in automated inspection systems where timing jitter must be minimized. IC Role / Device Role / Timing Role: Constant-current LED driver with sub-µs PWM propagation delay and stable 2MHz switching for repeatable exposure control. Use Value: 100ns PWM-to-PWMTG propagation delay and spread-spectrum EMI reduction allow integration near sensitive image sensors without interference. |
| Commercial Exterior Signage | Medical Endoscopic Illumination |
Use Scenario: Outdoor LED signage exposed to wide temperature swings and long operational cycles requiring consistent lumen output over time. IC Role / Device Role / Timing Role: Robust step-down LED driver with thermal shutdown and open-circuit protection for unattended operation. Use Value: –40°C to 125°C operating range and ±1.5% current accuracy maintain uniform brightness across seasonal ambient shifts without recalibration. | Use Scenario: Miniaturized, low-EMI illumination source inside endoscopes where space, heat, and electromagnetic compatibility are tightly constrained. IC Role / Device Role / Timing Role: Compact LED driver with Silent Switcher® architecture and 4mm × 5mm QFN package for integration into handheld diagnostic tools. Use Value: Low EMI emissions and integrated soft-start prevent interference with adjacent RF imaging circuits while enabling rapid, controlled illumination ramp-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED current control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3932IUFD#TRPBF | Base variant; supports 5000:1 PWM dimming (not 10000:1); identical pinout, package, and thermal rating. | Limited to lower dimming ratio requirements; lacks extended dimming capability of -1 version. | Select when 5000:1 dimming suffices and cost optimization is prioritized over ultra-high-resolution brightness control. |
| LM3409QMHX/NOPB | Non-synchronous buck LED driver; 1.25A max output; no internal PWM generator; requires external MOSFET and PWM source. | Lower integration level; no spread-spectrum or Silent Switcher® EMI reduction; not AEC-Q100 qualified. | Choose for cost-sensitive, non-automotive applications where external component count is acceptable and EMI constraints are relaxed. |
Compared with LT3932IUFD#TRPBF, the LT3932IUFD-1#TRPBF delivers double the PWM dimming ratio and retains full pin compatibility, while LM3409QMHX/NOPB offers lower integration but broader vendor availability and simpler thermal design at reduced current capability.
Availability
LT3932IUFD-1#TRPBF is available at Aetrix Electronics and suitable for automotive lighting, industrial machine vision, commercial signage, and medical endoscopy applications requiring stable component supply, AEC-Q100 compliance, and high-accuracy LED current regulation.
Supply support for LT3932IUFD-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 LT3932 product line delivers highly integrated, EMI-optimized LED drivers for demanding lighting applications - designed specifically for automotive-grade reliability, precision current regulation, and seamless integration into compact, thermally constrained systems.
FAQ
What is the maximum PWM dimming ratio supported by the LT3932IUFD-1#TRPBF?
The LT3932IUFD-1#TRPBF supports up to 10000+:1 PWM dimming ratio at 100Hz, enabled by its -1 variant architecture. This exceeds the 5000:1 capability of the standard LT3932IUFD#TRPBF and is achieved using internal PWM generation controlled by the RP resistor and PWM pin voltage. The LT3932IUFD-1#TRPBF datasheet confirms this specification under "Features" and "Electrical Characteristics" sections.
Does the LT3932IUFD-1#TRPBF require an external PMOS for PWM dimming?
No - the LT3932IUFD-1#TRPBF includes an internal PWM signal generator and PWMTG output pin capable of directly driving an external high-side PMOS for LED dimming. When RP is connected to GND and PWM is driven externally, it operates in direct PWM mode; when RP is tied to GND and a 1V–2V DC voltage is applied to PWM, the LT3932IUFD-1#TRPBF generates the internal PWM waveform. No external PWM controller is needed.
What is the purpose of the SYNC/SPRD pin on the LT3932IUFD-1#TRPBF?
The SYNC/SPRD pin on the LT3932IUFD-1#TRPBF serves dual functions: it accepts an external clock (200kHz–2MHz) to synchronize switching frequency, or - when tied to INTVCC - enables spread-spectrum frequency modulation (SSFM) to reduce EMI peaks. It does not function as a standalone enable/disable control. The LT3932IUFD-1#TRPBF maintains full functionality in either mode without requiring changes to RT resistor value.
How does the LT3932IUFD-1#TRPBF handle LED open-circuit and short-circuit faults?
The LT3932IUFD-1#TRPBF monitors FB voltage and ISP–ISN differential to detect faults: FB >950mV with ISP–ISN <10mV triggers open-circuit reporting; FB <200mV triggers short-circuit reporting. Both conditions pull the open-drain FAULT pin low. The response (hiccup vs latch-off) is selected via SS pin resistor configuration per the LT3932IUFD-1#TRPBF Applications Information section.
Is the LT3932IUFD-1#TRPBF pin-compatible with the LT3932IUFD#TRPBF?
Yes - the LT3932IUFD-1#TRPBF is fully pin-compatible with the LT3932IUFD#TRPBF, sharing identical 28-pin QFN (4mm × 5mm) package, pinout, thermal pad configuration, and absolute maximum ratings. The -1 suffix denotes functional enhancement (higher dimming ratio) only; no PCB layout change is required when upgrading from LT3932IUFD#TRPBF to LT3932IUFD-1#TRPBF.
LT3932IUFD-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:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LT3932IUFD-1#TRPBF FAQ
1.How can I place an order for LT3932IUFD-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3932IUFD-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 LT3932IUFD-1#TRPBF reliable?
The price and inventory of LT3932IUFD-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 LT3932IUFD-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3932IUFD-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3932IUFD-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3932IUFD-1#TRPBF?
LT3932IUFD-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3932IUFD-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 LT3932IUFD-1#TRPBF?
For technical support, including LT3932IUFD-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3932IUFD-1#TRPBF requirements.
6.How does Aetrix verify that LT3932IUFD-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3932IUFD-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 LT3932IUFD-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3932IUFD-1#TRPBF?
All LT3932IUFD-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3932IUFD-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 LT3932IUFD-1#TRPBF part is unused and in its original packaging.
Return procedure for LT3932IUFD-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3932IUFD-1#TRPBF Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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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
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BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
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