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Analog Devices Inc. LT3932HUFD#TRPBF
- Part No.:
- LT3932HUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3932HUFD#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR PWM 2A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,992
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Product details
Overview
LT3932HUFD#TRPBF from Analog Devices is a 36V, 2A synchronous step-down LED driver with Silent Switcher® architecture for low EMI, ±1.5% LED current regulation, and programmable 200kHz–2MHz switching frequency. It supports both analog voltage and PWM duty-cycle control of LED current and integrates an internal PWM dimming generator for automotive lighting systems.
For engineers reviewing the LT3932HUFD#TRPBF datasheet, LT3932HUFD#TRPBF pinout, LT3932HUFD#TRPBF application, or LT3932HUFD#TRPBF equivalent, key selection criteria include AEC-Q100 qualification, 150°C junction temperature rating, open/short LED fault reporting, internal high-side PMOS PWM driver (PWMTG), and spread-spectrum frequency modulation capability.
Technical Context
The LT3932HUFD#TRPBF implements fixed-frequency peak-current-mode 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 sense voltage, while voltage regulation employs a separate 480 µA/V error amplifier monitoring FB.
It features dual dimming paths: external PWM input at the PWM pin drives PWMTG directly, while analog or digital CTRL signals program LED current via an A/D detector and control buffer. The RP pin sets internal PWM frequency (7.4–128 kHz), and SYNC/SPRD enables external clock synchronization or spread-spectrum operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports wide automotive battery range including cold-crank and load-dump conditions |
| Max Output Current | 2A - delivers stable current for multi-LED strings up to 36V VOUT |
| Switching Frequency | 200kHz to 2MHz - programmable via RT resistor or external SYNC clock; enables compact magnetics |
| LED Current Accuracy | ±1.5% - tight regulation ensures consistent brightness across temperature and line variations |
| Junction Temp Range | −40°C to +150°C - H-grade qualification enables under-hood automotive deployment |
| PWM Dimming Ratio | 5000:1 (external), 128:1 (internal) - supports high-contrast display and adaptive lighting control |
| EMI Reduction | Silent Switcher® architecture + spread-spectrum modulation - reduces peak radiated emissions by >10dB |
Pinout & Package
LT3932HUFD#TRPBF is housed in a thermally enhanced 28-pin (4mm × 5mm) plastic QFN package with exposed pad (Pin 29) soldered to PCB ground for optimal thermal performance (θJA = 25°C/W on DC2286A).
| 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 ceramic bypassing per layout guidelines |
| ISP / ISN (Pins 6, 7) | Current Sense Inputs | Differential inputs to 200 µA/V transconductance amplifier; tolerate 0–36V common-mode range |
| CTRL (Pin 15) | LED Current Programming | Accepts 250–1250mV analog voltage or 100kHz–1MHz pulse train to set LED current |
| PWM (Pin 22) | Dimming Control Input | Drives internal PWM generator (0–100% duty) or controls external PMOS via PWMTG when RP is grounded |
| PWMTG (Pin 23) | High-Side PMOS Gate Driver | Open-drain output capable of driving external PMOS for precise PWM dimming without added controller |
| FAULT (Pin 8) | Open/Short Fault Indicator | Active-low open-drain output signaling LED string faults; pulls low for FB < 200mV (short) or FB > 950mV + ISN–ISP < 10mV (open) |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified (H Grade) | Rated for −40°C to +150°C junction operation - validated for automotive front-lighting and interior modules |
| Silent Switcher® Architecture | Minimizes EMI/EMC emissions without shielding or ferrites - simplifies compliance testing in space-constrained designs |
| Integrated PWM Dimming Generator | RP-programmable internal PWM (7.4–128 kHz) eliminates need for external timing IC in analog-dimming applications |
| Accurate LED Current Monitor (ISMON) | 10× buffered output (10 mV per 1 mV ISP–ISN) enables real-time current telemetry and closed-loop feedback |
| Programmable UVLO with Hysteresis | EN/UVLO threshold = 1.15V (rising), 1.09V (falling); 20mV hysteresis prevents oscillation during brownout |
| Robust Fault Protection | Dual comparator-based open-circuit (FB > 950mV) and short-circuit (FB < 200mV) detection with FAULT pin assertion |
Applications
| Automotive Headlamp Systems | Industrial Machine Vision Lighting |
|---|---|
Use Scenario: Adaptive driving beam (ADB) headlamps requiring precise, high-dynamic-range LED current control under varying battery voltage and ambient temperature. IC Role / Device Role / Timing Role: Primary LED current regulator and PWM dimming controller; manages thermal derating and fault-safe shutdown per ISO 26262 ASIL-B requirements. Use Value: ±1.5% current accuracy and 150°C operation ensure consistent lumen output across vehicle lifetime; Silent Switcher® reduces EMI interference with ADAS sensors. |
Use Scenario: High-speed inspection systems using strobed LED arrays synchronized to camera exposure timing. IC Role / Device Role / Timing Role: Synchronized LED driver with sub-µs PWM propagation delay (100ns turn-on/off) and fast recovery after dimming pulses. Use Value: Internal PWM generator (7.4–128 kHz) and PWMTG output enable deterministic strobe timing without external logic; 5000:1 external dimming ratio supports grayscale imaging. |
| Commercial Architectural Lighting | Avionics Cabin Lighting |
Use Scenario: DALI- or 0–10V-controlled linear LED fixtures requiring stable current over 36V input range and long thermal cycles. IC Role / Device Role / Timing Role: Constant-current buck controller with analog/digital dimming interface and output voltage limiting via FB divider. Use Value: 20:1 analog/duty-cycle LED current control range and ±1.2% output voltage regulation prevent overvoltage stress on LED strings during dimming transitions. |
Use Scenario: FAA-certified cabin lighting with stringent EMI limits and reliability requirements for extended flight hours. IC Role / Device Role / Timing Role: Low-EMI LED driver with latch-off fault response and traceable sourcing for DO-160 Section 21 compliance. Use Value: Spread-spectrum modulation and Silent Switcher® reduce conducted/radiated emissions below DO-160 limits; AEC-Q100 H-grade process ensures long-term parametric stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3932IUFD#TRPBF | Same functionality but rated for −40°C to +125°C junction temperature; lacks AEC-Q100 qualification | Suitable for industrial lighting where automotive qualification is not required | Select when cost sensitivity outweighs automotive reliability requirements and ambient temperature stays ≤125°C |
| LM3409QMY/NOPB | Non-synchronous buck LED driver; no integrated PWM generator or Silent Switcher®; max 1.5A output | Lower-cost solution for non-automotive, non-EMI-critical applications | Choose only if EMI constraints are relaxed and dimming ratio < 1000:1 is acceptable |
Compared with LT3932IUFD#TRPBF, the LT3932HUFD#TRPBF adds AEC-Q100 qualification and 150°C operation for under-hood use, while LM3409QMY/NOPB trades EMI performance and integration for lower BOM count in cost-driven industrial designs.
Availability
LT3932HUFD#TRPBF is available at Aetrix Electronics and suitable for automotive lighting, industrial machine vision, commercial architectural lighting, and avionics cabin lighting requiring stable component supply with full AEC-Q100 traceability.
Supply support for LT3932HUFD#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 high-accuracy, low-EMI LED drivers optimized for automotive front-lighting and safety-critical illumination systems, combining robust protection, wide input range, and AEC-Q100 compliance.
FAQ
What is the maximum operating junction temperature for LT3932HUFD#TRPBF?
The LT3932HUFD#TRPBF is qualified for continuous operation up to +150°C junction temperature, verified per AEC-Q100 stress test conditions. This rating enables deployment in high-temperature automotive locations such as headlamp housings and engine bay proximity zones. Derating curves in the datasheet specify allowable output current reduction above 125°C ambient.
Does LT3932HUFD#TRPBF support both analog and PWM dimming simultaneously?
No - the LT3932HUFD#TRPBF uses either analog voltage at the CTRL pin or digital pulse duty cycle at CTRL for LED current setting, and separately uses either external PWM at the PWM pin or internal PWM (set by RP) for dimming. These two control domains operate independently but are not combined in real time; simultaneous analog current programming and PWM dimming is supported.
How does the FAULT pin indicate open-circuit versus short-circuit LED conditions in LT3932HUFD#TRPBF?
The LT3932HUFD#TRPBF asserts the FAULT pin low for both conditions: open-circuit is detected when FB voltage exceeds 950mV *and* ISP–ISN voltage falls below 10mV; short-circuit is triggered when FB drops below 200mV. The same open-drain FAULT output signals both faults, requiring external logic or MCU polling of FB and ISP/ISN to distinguish root cause.
Can LT3932HUFD#TRPBF drive LEDs with output voltages exceeding 36V?
No - the absolute maximum rating for ISP, ISN, and VOUT pins is 40V, and the device is specified for 0V to 36V LED string voltage. Exceeding 36V risks violating the guaranteed regulation accuracy and may trigger FB overvoltage lockout (1.05V threshold). For higher-voltage strings, a cascaded topology or alternative controller must be used.
What is the purpose of the RP pin on LT3932HUFD#TRPBF, and what happens if it's left unconnected?
The RP pin sets the frequency of the internal PWM dimming signal (7.4–128 kHz) when a resistor is connected from RP to GND. If RP is left floating, internal PWM generation is disabled; the LT3932HUFD#TRPBF requires an external PWM signal applied to the PWM pin to achieve dimming. Leaving RP unconnected does not damage the part but disables the internal PWM function.
LT3932HUFD#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#TRPBF FAQ
1.How can I place an order for LT3932HUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3932HUFD#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#TRPBF reliable?
The price and inventory of LT3932HUFD#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3932HUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3932HUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3932HUFD#TRPBF?
LT3932HUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3932HUFD#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#TRPBF?
For technical support, including LT3932HUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3932HUFD#TRPBF requirements.
6.How does Aetrix verify that LT3932HUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3932HUFD#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3932HUFD#TRPBF?
All LT3932HUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3932HUFD#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#TRPBF part is unused and in its original packaging.
Return procedure for LT3932HUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3932HUFD#TRPBF Tags
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