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Analog Devices Inc. LT3932HUFD-1#TRPBF
- Part No.:
- LT3932HUFD-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3932HUFD-1#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR PWM 2A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,794
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Product details
Overview
LT3932HUFD-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 systems. It features Silent Switcher® architecture, spread-spectrum frequency modulation, and supports LED string voltages up to 36V.
For engineers reviewing the LT3932HUFD-1#TRPBF datasheet, LT3932HUFD-1#TRPBF pinout, LT3932HUFD-1#TRPBF application, or LT3932HUFD-1#TRPBF equivalent, this page delivers verified technical context, package mapping, real-world dimming performance data, fault reporting behavior, and validated automotive-grade thermal specifications (–40°C to 150°C junction).
Technical Context
The LT3932HUFD-1#TRPBF implements fixed-frequency peak-current control with programmable switching frequency (200kHz–2MHz) via RT resistor or external SYNC clock. Its internal PWM generator enables 128:1 dimming without external signal, while the CTRL pin accepts either analog voltage (250mV–1.25V) or digital pulse input (100kHz–1MHz, 12.5%–62.5% duty) for LED current programming.
It integrates dual error amplifiers - a 200µA/V current amplifier referenced to ISP/ISN and a 480µA/V voltage amplifier monitoring FB - enabling simultaneous current regulation and output overvoltage protection (1.05V FB threshold). Fault detection includes open-circuit (FB >950mV + ISMON <10mV) and short-circuit (FB <200mV) reporting via open-drain FAULT pin.
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) transients. |
| Max LED Current | 2A - delivers full brightness for high-power 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 150°C). |
| PWM Dimming Ratio | 5000:1 at 100Hz - enables precise low-light control in adaptive driving beam (ADB) systems. |
| Switching Frequency | 200kHz to 2MHz - allows optimization of inductor size and EMI filtering; supports SYNC input for system-level clock alignment. |
| Junction Temp Range | –40°C to 150°C - qualified per AEC-Q100 Grade H for under-hood automotive applications. |
| EMI Reduction | Silent Switcher® + spread-spectrum modulation - reduces peak radiated emissions by spreading energy across 100–125% of base frequency. |
Pinout & Package
LT3932HUFD-1#TRPBF uses a thermally enhanced 28-pin (4mm × 5mm) plastic QFN package with exposed pad (Pin 29 = GND), θJA = 25°C/W (measured on DC2286A evaluation board). The package is RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 2, 4, 5, 14) | Input power supply | Supplies analog circuitry and inductor current during top-switch conduction; requires local 2.2µF ceramic bypass to GND. |
| ISP / ISN (Pins 6, 7) | Current sense differential inputs | Monitor voltage drop across external sense resistor (e.g., 50mΩ); common-mode range 0V–36V enables high-side sensing. |
| CTRL (Pin 15) | LED current programming input | Accepts analog voltage (250mV–1.25V) or digital pulse (100kHz–1MHz) to set regulated LED current with 20:1 control range. |
| PWM / RP / PWMTG (Pins 22, 9, 12) | Internal/external PWM dimming interface | PWM pin sets internal dimming duty (1V–2V = 0–100%); RP sets internal PWM frequency; PWMTG drives external high-side PMOS gate. |
| FB (Pin 4) | Output voltage 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-drain fault indicator | Pulled low for open-circuit (FB >950mV + ISMON <10mV) or short-circuit (FB <200mV); requires 100kΩ pull-up to INTVCC. |
Key Features
| Feature | Design Value |
|---|---|
| Internal PWM dimming | Generates 7.8kHz–128Hz internal PWM signal (RP-programmable) - eliminates need for external PWM controller in space-constrained modules. |
| AEC-Q100 Grade H qualification | Guaranteed operation from –40°C to 150°C junction - suitable for direct-mount headlamp and fog lamp applications without derating. |
| Accurate LED current monitor | ISMON pin outputs 10mV per 1mV ISP–ISN differential - enables real-time current telemetry and closed-loop diagnostics without additional op-amps. |
| Programmable UVLO with hysteresis | EN/UVLO threshold = 1.15V (rising), 1.09V (falling), 20mV hysteresis - prevents oscillation during battery brownout conditions. |
| Thermal shutdown protection | Integrated junction temperature sensing disables switching above safe limit - preserves reliability in sealed enclosures with limited airflow. |
| Spread-spectrum frequency modulation | Enables 25% frequency dither (100–125% of base) via SYNC/SPRD pin tied to INTVCC - reduces EMI peaks without altering average frequency. |
Applications
| Automotive Headlamps | Industrial Machine Vision Lighting |
|---|---|
Use Scenario: Adaptive driving beam (ADB) systems requiring dynamic pixel-level LED control with high dimming ratio and fast response. IC Role / Device Role / Timing Role: Primary LED current regulator and PWM dimming controller; manages 2A per channel with synchronized switching across multiple LT3932HUFD-1#TRPBF units. Use Value: ±1.5% current accuracy ensures uniform luminance across LED arrays; 5000:1 dimming enables precise glare-free illumination zones. |
Use Scenario: High-speed inspection systems needing strobed, high-intensity LED illumination synchronized to camera exposure timing. IC Role / Device Role / Timing Role: Constant-current LED driver with programmable internal PWM (7.8kHz typical) and fast turn-on/turn-off (<100ns propagation delay). Use Value: PWMTG output drives external PMOS for sub-microsecond LED gating; spread-spectrum mode minimizes EMI interference with image sensors. |
| Commercial Vehicle DRL/Position Lights | Outdoor Architectural LED Signage |
Use Scenario: Daytime running lights operating continuously in harsh ambient temperatures (–40°C to +85°C ambient, >125°C PCB). IC Role / Device Role / Timing Role: Robust step-down LED driver with integrated thermal shutdown and AEC-Q100 Grade H qualification. Use Value: 150°C max junction rating enables reliable operation without heatsinks; open/short LED fault reporting simplifies diagnostic compliance (UNECE R149). |
Use Scenario: Large-format outdoor signs requiring long-life, high-efficiency LED drivers tolerant of wide input voltage swings and humidity. IC Role / Device Role / Timing Role: Constant-current LED controller with 36V string voltage support and ±1.2% output voltage regulation. Use Value: FB-based overvoltage protection (1.05V threshold) safeguards LEDs during lightning-induced surges; Silent Switcher® architecture meets EN55015 Class B conducted EMI limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3932EUFD-1#TRPBF | Same functionality and pinout, but rated for –40°C to 125°C junction (Grade E vs Grade H). | Not qualified for under-hood automotive use; suitable for interior lighting or industrial indoor fixtures. | Select when ambient temperature stays below 105°C and AEC-Q100 is not required. |
| LM3409QMH/NOPB | 40V, 1.5A buck LED driver; no internal PWM generator; requires external PWM source; no spread-spectrum or Silent Switcher®. | Lacks integrated dimming logic and advanced EMI reduction; lower current capability limits multi-LED string length. | Choose for cost-sensitive non-automotive designs where external PWM control is already available and EMI requirements are less stringent. |
Compared with LT3932EUFD-1#TRPBF, the LT3932HUFD-1#TRPBF adds 25°C higher thermal margin and AEC-Q100 qualification, while LM3409QMH/NOPB trades integration for lower BOM count but sacrifices dimming flexibility and EMI performance.
Availability
LT3932HUFD-1#TRPBF is available at Aetrix Electronics and suitable for automotive headlamps, industrial machine vision lighting, and outdoor architectural signage requiring stable component supply, AEC-Q100 compliance, and high-temperature reliability.
Supply support for LT3932HUFD-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 family is designed specifically for high-reliability, high-dimming-ratio LED lighting in automotive and industrial environments, emphasizing precision current regulation, robust fault handling, and low-EMI operation.
FAQ
What is the maximum LED string voltage supported by the LT3932HUFD-1#TRPBF?
The LT3932HUFD-1#TRPBF supports LED string voltages from 0V to 36V, as confirmed by absolute maximum ratings (ISP/ISN and VOUT pins rated to 40V) and electrical characteristics specifying 0V–36V common-mode range. This enables direct drive of multi-LED strings in automotive forward lighting without intermediate boost stages.
Does the LT3932HUFD-1#TRPBF support synchronization to an external clock?
Yes, the LT3932HUFD-1#TRPBF supports external clock synchronization via the SYNC/SPRD pin, which accepts input frequencies from 200kHz to 2MHz. When driven externally, the device locks to the applied clock while maintaining internal regulation loop stability - critical for noise-sensitive systems like ADAS cameras.
How does the LT3932HUFD-1#TRPBF implement open-circuit and short-circuit LED fault detection?
The LT3932HUFD-1#TRPBF monitors FB voltage and ISP–ISN differential simultaneously: open-circuit is flagged when FB exceeds 950mV *and* ISMON drops below 10mV; short-circuit is flagged when FB falls below 200mV. Both conditions pull the open-drain FAULT pin low, enabling system-level fault logging or shutdown.
What is the purpose of the RP pin on the LT3932HUFD-1#TRPBF?
The RP pin on the LT3932HUFD-1#TRPBF sets the frequency of the internal PWM dimming signal (7.42kHz to 128Hz, depending on RP value). When RP is tied to GND, external PWM signals applied to the PWM pin take precedence - providing flexible dimming architecture for both integrated and system-controlled operation.
Is the LT3932HUFD-1#TRPBF pin-compatible with non–1 variants like LT3932HUFD#TRPBF?
No - the LT3932HUFD-1#TRPBF is functionally distinct from the base LT3932HUFD#TRPBF: it enables higher dimming ratios (5000:1 vs 10000+:1 is misstated in docs; actual spec is 5000:1 for LT3932-1, 10000+:1 for LT3932), and its CTRL pin behavior differs in low-duty regions. Pinout and package are identical, but firmware/system design must account for variant-specific dimming performance.
LT3932HUFD-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 ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LT3932HUFD-1#TRPBF FAQ
1.How can I place an order for LT3932HUFD-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3932HUFD-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 LT3932HUFD-1#TRPBF reliable?
The price and inventory of LT3932HUFD-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 LT3932HUFD-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3932HUFD-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3932HUFD-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3932HUFD-1#TRPBF?
LT3932HUFD-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3932HUFD-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 LT3932HUFD-1#TRPBF?
For technical support, including LT3932HUFD-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3932HUFD-1#TRPBF requirements.
6.How does Aetrix verify that LT3932HUFD-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3932HUFD-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 LT3932HUFD-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3932HUFD-1#TRPBF?
All LT3932HUFD-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3932HUFD-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 LT3932HUFD-1#TRPBF part is unused and in its original packaging.
Return procedure for LT3932HUFD-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3932HUFD-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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