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Analog Devices Inc. LT3932HUFD-1#PBF
- Part No.:
- LT3932HUFD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3932HUFD-1#PBF.pdf
- Description:
- IC LED DRIVER RGLTR PWM 2A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,406
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Product details
Overview
LT3932HUFD-1#PBF from Analog Devices is a 36V, 2A synchronous step-down LED driver with internal PWM dimming, ±1.5% LED current regulation, and AEC-Q100 qualification for automotive lighting. It features Silent Switcher® architecture for low EMI, programmable 200kHz–2MHz switching frequency, and supports analog or digital CTRL input for LED current control in machine vision and industrial lighting systems.
For engineers reviewing the LT3932HUFD-1#PBF datasheet, LT3932HUFD-1#PBF pinout, LT3932HUFD-1#PBF application, or LT3932HUFD-1#PBF equivalent, key selection considerations include its −40°C to 150°C junction temperature rating, 5000:1 external PWM dimming ratio, internal 128:1 PWM generator, open/short LED fault reporting, and thermally enhanced 28-pin 4mm × 5mm QFN package with exposed GND pad.
Technical Context
The LT3932HUFD-1#PBF implements fixed-frequency peak-current control with dual power switches and integrated gate drivers. Its current regulation loop uses a transconductance amplifier (gm = 200 µA/V) referenced to ISP/ISN, while voltage regulation employs a separate 480 µA/V error amplifier monitoring FB against 1.000 V.
It integrates a programmable oscillator (RT/SYNC/SPRD), spread-spectrum modulation capability, internal PWM signal generator (RP-set frequency), and high-side PMOS driver (PWMTG) with 10–11 V gate drive swing. Fault logic detects open-circuit (>950 mV on FB) and short-circuit (<200 mV on FB) conditions and asserts FAULT as open-drain output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6 V to 36 V - supports wide automotive battery range including cold-crank and load-dump transients. |
| LED Current Accuracy | ±1.5% - ensures consistent luminance across temperature and line variations in safety-critical lighting. |
| Switching Frequency | 200 kHz to 2 MHz - enables compact magnetics and noise avoidance in sensitive RF environments. |
| PWM Dimming Ratio | 5000:1 (external) / 128:1 (internal) - delivers high-resolution brightness control for adaptive lighting systems. |
| Junction Temperature | −40°C to +150°C - qualified per AEC-Q100 Grade H for under-hood and headlamp applications. |
| EMI Performance | Silent Switcher® architecture - reduces radiated emissions without added shielding or filtering overhead. |
| Fault Reporting | Open-circuit (FB > 950 mV) & short-circuit (FB < 200 mV) - enables fail-safe diagnostics via FAULT pin. |
Pinout & Package
LT3932HUFD-1#PBF is housed in a thermally enhanced 28-pin (4 mm × 5 mm) plastic QFN package with exposed GND pad (Pin 29), rated θJA = 25°C/W on DC2286A evaluation board. The package is RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 4, 5, 14, 17) | Input Power Supply | Supplies analog circuitry and high-side switch; requires local 2.2 µF ceramic bypass to GND. |
| ISP / ISN (Pins 6, 7) | Current Sense Inputs | Differential inputs to 200 µA/V transconductance amplifier; sense resistor placed in LED return path. |
| CTRL (Pin 15) | LED Current Programming | Accepts 250–1250 mV analog voltage or 100–1000 kHz pulse (12.5–62.5% duty) to set LED current. |
| FB (Pin 4) | Output Voltage Feedback | Monitors LED string voltage via resistor divider; trips overvoltage lockout at 1.05 V (±48 mV hysteresis). |
| PWM / RP / PWMTG (Pins 22, 9, 12) | Dimming Control Interface | PWM sets internal dimming duty; RP sets internal PWM frequency; PWMTG drives external high-side PMOS. |
| FAULT (Pin 8) | Open/Short Fault Indicator | Open-drain output pulled low for FB < 200 mV (short) or FB > 950 mV + ISN–ISP < 10 mV (open). |
| GND (Pins 3, 10, 11, 16, 29) | Ground Reference | Multiple GND pins and exposed thermal pad must be soldered to PCB ground plane for thermal & EMI integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Internal PWM dimming generator | 128:1 dimming ratio with RP-programmable frequency (7.4–128 kHz); eliminates need for external PWM source. |
| Accurate LED current monitor | ISMON provides 10 mV/mV buffered replica of ISP–ISN voltage - enables real-time current telemetry without gain error. |
| Programmable UVLO threshold | EN/UVLO pin with 1.15 V rising threshold and 20 mV hysteresis - allows custom input undervoltage lockout using resistor divider. |
| Silent Switcher® low-EMI design | Integrated dual-loop layout and balanced power paths reduce peak radiated emissions by >20 dB vs conventional buck LED drivers. |
| Thermal shutdown protection | Auto-recovery shutdown above 165°C junction; guaranteed operation up to 150°C continuous for automotive Grade H. |
Applications
| Automotive Headlamps | Industrial Machine Vision |
|---|---|
|
Use Scenario: Adaptive driving beam (ADB) systems requiring precise, fast-response LED current control across temperature extremes. IC Role / Device Role / Timing Role: Primary LED current regulator and PWM dimming controller with fault reporting for ASIL-B compliant lighting modules. Use Value: ±1.5% current accuracy and AEC-Q100 Grade H rating ensure consistent photometric output and functional safety compliance. |
Use Scenario: High-speed stroboscopic illumination synchronized to camera exposure in automated inspection systems. IC Role / Device Role / Timing Role: Synchronous step-down LED driver with 5000:1 external PWM dimming and sub-microsecond propagation delay. Use Value: 7.8 kHz internal PWM frequency and <100 ns PWMTG propagation enable precise strobe timing without external timing ICs. |
| Commercial Street Lighting | Medical Endoscopy Illumination |
|
Use Scenario: Outdoor LED luminaires operating in wide ambient temperatures with long service life requirements. IC Role / Device Role / Timing Role: Constant-current LED driver with open/short LED fault detection and thermal derating management. Use Value: Integrated fault reporting (FAULT pin) and 150°C max junction temperature support unattended operation in sealed enclosures. |
Use Scenario: Compact, low-noise surgical light sources where EMI must not interfere with imaging sensors or RF telemetry. IC Role / Device Role / Timing Role: Low-EMI LED driver with Silent Switcher® architecture and regulated current for flicker-free illumination. Use Value: Spread-spectrum modulation and minimized switching node dv/dt suppress conducted/radiated noise below CISPR-22 Class B limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3932HUFD#PBF | Lacks -1 suffix: supports only 1000:1 external PWM dimming (vs. 5000:1), no internal PWM generator (RP/PWM pins unused). | Not suitable for high-ratio dimming or systems requiring integrated PWM signal generation. | Select LT3932HUFD-1#PBF when 5000:1 dimming or internal PWM generation is required; use LT3932HUFD#PBF only for simpler on/off or low-ratio analog dimming. |
| LM3409QMYX/NOPB | Non-synchronous buck, 1.25 A max, no internal PWM generator, no spread-spectrum, no AEC-Q100 qualification. | Lower cost for non-automotive, non-critical dimming applications; lacks fault reporting and thermal grade. | Choose LM3409QMYX/NOPB only for cost-sensitive industrial lighting without automotive or high-reliability requirements. |
Compared with LT3932HUFD#PBF, the LT3932HUFD-1#PBF adds internal PWM generation and higher dimming resolution-critical for adaptive lighting-while LM3409QMYX/NOPB trades EMI performance, integration, and qualification for lower BOM cost in less demanding applications.
Availability
LT3932HUFD-1#PBF is available at Aetrix Electronics and suitable for automotive headlamps, industrial machine vision systems, and medical endoscopy illumination requiring stable component supply, AEC-Q100 compliance, and high-temperature reliability.
Supply support for LT3932HUFD-1#PBF 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-efficiency, high-reliability LED lighting in automotive and industrial environments, emphasizing low EMI, wide input range, and robust fault protection.
FAQ
What is the maximum junction temperature rating for the LT3932HUFD-1#PBF?
The LT3932HUFD-1#PBF is rated for operation from −40°C to +150°C junction temperature and is qualified per AEC-Q100 Grade H. This makes it suitable for under-hood automotive applications where sustained high ambient temperatures occur. Derating guidelines apply above 125°C, and thermal shutdown activates at approximately 165°C to protect the device.
How does the LT3932HUFD-1#PBF achieve 5000:1 PWM dimming?
The LT3932HUFD-1#PBF achieves 5000:1 external PWM dimming by accepting a clean, externally generated PWM signal at the PWM pin with frequency ≥100 Hz and duty cycle resolution down to 0.02%. Its internal comparator and gate driver preserve timing fidelity, enabling deep dimming without color shift or flicker in high-end lighting systems.
Can the LT3932HUFD-1#PBF operate without an external PWM signal?
Yes - the LT3932HUFD-1#PBF includes an internal PWM generator. When RP is connected to GND and a DC voltage between 1.0 V and 2.0 V is applied to the PWM pin, the IC generates a corresponding internal PWM signal with 0–100% duty ratio and frequency set by RP (7.4–128 kHz). This eliminates dependency on external timing circuitry.
What fault conditions does the LT3932HUFD-1#PBF detect and report?
The LT3932HUFD-1#PBF detects and reports two primary LED string faults via the open-drain FAULT pin: open-circuit (FB voltage >950 mV while ISP–ISN <10 mV) and short-circuit (FB voltage <200 mV). Both conditions pull FAULT low, enabling system-level diagnostics and safe shutdown in automotive and medical lighting.
Is the LT3932HUFD-1#PBF pin-compatible with earlier LT3932 variants?
Yes - the LT3932HUFD-1#PBF shares identical pinout, package (28-pin 4mm × 5mm QFN), and footprint with LT3932HUFD#PBF and other UFD variants. However, the -1 version enables additional functionality (internal PWM, higher dimming ratio) via updated internal logic; no PCB change is needed for migration, but RP/PWM pin usage differs.
LT3932HUFD-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT3932HUFD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3932HUFD-1#PBF 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#PBF reliable?
The price and inventory of LT3932HUFD-1#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LT3932HUFD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3932HUFD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3932HUFD-1#PBF?
LT3932HUFD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3932HUFD-1#PBF 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#PBF?
For technical support, including LT3932HUFD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3932HUFD-1#PBF requirements.
6.How does Aetrix verify that LT3932HUFD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT3932HUFD-1#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT3932HUFD-1#PBF?
All LT3932HUFD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3932HUFD-1#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT3932HUFD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3932HUFD-1#PBF Tags
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BCR402RE6327HTSA1
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BCR420UE6433HTMA1
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BCR421UE6327HTSA1
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LYT1604D-TL
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