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Analog Devices Inc. LT3932EUFD#TRPBF
- Part No.:
- LT3932EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3932EUFD#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR PWM 2A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,377
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Product details
Overview
LT3932EUFD#TRPBF from Analog Devices is a 36V, 2A synchronous step-down LED driver with Silent Switcher® architecture for low EMI, fixed-frequency peak-current control, and dual-mode dimming (analog voltage or PWM duty cycle at CTRL pin). It supports 0V–36V LED string voltage, programmable 200kHz–2MHz switching, and internal PWM dimming up to 128:1 - used in automotive headlamps and machine vision illumination.
For engineers reviewing the LT3932EUFD#TRPBF datasheet, LT3932EUFD#TRPBF pinout, LT3932EUFD#TRPBF application, or LT3932EUFD#TRPBF equivalent, key selection criteria include ±1.5% LED current regulation accuracy, AEC-Q100 qualification, open/short LED fault reporting, thermally enhanced 28-pin QFN package, and support for spread-spectrum frequency modulation to meet CISPR 25 Class 5 emissions limits.
Technical Context
The LT3932EUFD#TRPBF integrates dual MOSFET power switches, a 2V reference, current and voltage error amplifiers (gm = 200 µA/V and 480 µA/V), and a peak-current comparator with 55 ns minimum on/off time. Its oscillator accepts RT-resistor programming or external SYNC clock input, and spread-spectrum mode modulates frequency by ±25% when SYNC/SPRD is pulled high.
It implements analog/digital LED current control via CTRL pin (250 mV–1.25 V DC or 12.5%–62.5% duty cycle pulses), monitors LED current through ISMON (10 mV per 1 mV ISP–ISN), and provides overvoltage protection (FB OVLO = 1.05 V) and fault reporting via open-drain FAULT pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6 V to 36 V - supports wide-range automotive battery systems including cold-crank (6 V) and load-dump (36 V) 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 - selectable via RT resistor or external SYNC clock; enables layout optimization and noise avoidance in sensitive RF bands. |
| PWM Dimming Ratio | 5000:1 (external) / 128:1 (internal) - delivers high-contrast dimming for adaptive driving beam (ADB) and industrial inspection systems. |
| Package Thermal Resistance | θJA = 25°C/W - measured on DC2286A evaluation board; enables 2A continuous LED drive without forced air in compact automotive modules. |
| Fault Protection | Open-circuit (FB > 950 mV) and short-circuit (FB < 200 mV) detection with FAULT pin assertion - eliminates need for external monitoring circuitry. |
| AEC-Q100 Grade | Grade E (–40°C to +125°C junction) - qualified for under-hood automotive LED lighting applications per stress test requirements. |
Pinout & Package
LT3932EUFD#TRPBF uses a thermally enhanced 28-pin (4 mm × 5 mm) plastic QFN package with exposed pad (Pin 29) soldered to PCB ground for optimal thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 2, 4, 5, 14) | Input Power Supply | Supplies analog circuitry and inductor current during high-side switch conduction; requires local 2.2 µF ceramic bypass to GND. |
| ISP / ISN (Pins 6, 7) | Current Sense Inputs | Differential inputs to current error amplifier; sense voltage range 4–101.5 mV corresponds to 5–100% LED current setpoint. |
| CTRL (Pin 15) | LED Current Programming | Accepts 250 mV–1.25 V analog voltage or 100 kHz–1 MHz pulse train to set regulated LED current with 20:1 control range. |
| FB (Pin 4) | Output Voltage Feedback | Monitors LED string voltage via resistor divider; triggers overvoltage lockout at 1.05 V and fault reporting at open (>950 mV) or short (<200 mV). |
| FAULT (Pin 8) | Open/Short Fault Indicator | Open-drain output pulled low during LED open-circuit or short-circuit conditions; requires 100 kΩ pull-up to INTVCC. |
| PWM / RP / PWMTG (Pins 22, 9, 12) | Dimming Control Interface | PWM pin accepts external signal or sets internal duty ratio (0–100%); RP selects internal PWM frequency; PWMTG drives external high-side PMOS gate. |
| RT / SYNC/SPRD (Pins 18, 11) | Frequency Configuration | RT sets base switching frequency; SYNC/SPRD accepts external clock or enables spread-spectrum mode when tied to INTVCC. |
| GND (Pins 3, 10, 13, 16, 29) | Ground Reference | Multiple ground pins including exposed thermal pad (Pin 29) - must be solidly soldered to PCB ground plane for thermal and EMI integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Minimizes radiated EMI through symmetrical layout and integrated hot-loop capacitors - meets CISPR 25 Class 5 without shielding cans. |
| Internal PWM Dimming Generator | Provides 7.4–128 kHz adjustable frequency and 0–100% duty control via RP resistor and PWM pin voltage - eliminates need for external PWM controller IC. |
| Accurate LED Current Monitor (ISMON) | Outputs 10 mV per 1 mV ISP–ISN differential - enables real-time current telemetry and closed-loop feedback in adaptive lighting systems. |
| Programmable UVLO Threshold | EN/UVLO rising threshold = 1.15 V ±60 mV with 20 mV hysteresis - allows precise startup/shutdown sequencing in 12 V/24 V automotive systems. |
| Thermal Shutdown Protection | Activates at TJ ≥ 165°C (typical) and auto-restarts after cooldown - prevents permanent damage during transient overload or poor heatsinking. |
Applications
| Automotive Headlamps | Industrial Machine Vision |
|---|---|
Use Scenario: Adaptive driving beam (ADB) systems requiring dynamic pixel-level LED control in harsh under-hood environments. IC Role / Device Role / Timing Role: Primary LED current regulator and PWM dimming controller with fault reporting for each LED segment. Use Value: ±1.5% current accuracy ensures consistent photometric output across temperature; AEC-Q100 qualification guarantees reliability over 15-year vehicle lifetime. |
Use Scenario: High-speed inspection lighting where precise, flicker-free intensity control improves image capture fidelity. IC Role / Device Role / Timing Role: Constant-current LED driver synchronized to camera exposure timing via external PWM or SYNC input. Use Value: 5000:1 external PWM dimming ratio enables sub-millisecond intensity ramping; 2 MHz max switching avoids interference with camera frame rates. |
| General Purpose Lighting | Commercial Signage |
Use Scenario: Outdoor architectural lighting operating from 12–36 V DC supplies with wide ambient temperature swings. IC Role / Device Role / Timing Role: Step-down LED driver with output voltage limiting and open/short protection for unattended operation. Use Value: 0–36 V LED string voltage range accommodates 1–10 LED series strings; FB-based overvoltage protection prevents LED over-stress during thermal derating. |
Use Scenario: Dynamic RGB signage requiring independent current control and dimming for red, green, and blue LED channels. IC Role / Device Role / Timing Role: Single-channel constant-current driver used in triple configuration with shared SYNC/SPRD for inter-channel timing alignment. Use Value: Spread-spectrum frequency modulation reduces narrowband EMI peaks that interfere with wireless communication in dense urban installations. |
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 electrical specs but rated for –40°C to +125°C over full temp range (vs. LT3932EUFD#TRPBF's 0°C to +125°C guaranteed spec, –40°C to +125°C assured by design). | Preferred for industrial designs requiring full-temperature-range production testing and data sheet guarantee. | Select LT3932IUFD#TRPBF when full –40°C to +125°C parametric validation is contractually required. |
| LT3932-1EUFD#TRPBF | Supports higher PWM dimming ratios (10000:1 vs. 5000:1) and improved dimming linearity below 10% duty cycle. | Required for ultra-low-light applications such as night-vision-compatible cockpit displays or medical endoscopy lighting. | Choose LT3932-1EUFD#TRPBF only when >5000:1 dimming ratio is mandatory and system firmware supports variant-specific CTRL timing. |
Compared with LT3932IUFD#TRPBF, the LT3932EUFD#TRPBF offers identical functionality at lower cost for applications where full-temperature-range characterization is not mandated; versus LT3932-1EUFD#TRPBF, it trades dimming resolution for broader compatibility with legacy analog dimming interfaces.
Availability
LT3932EUFD#TRPBF is available at Aetrix Electronics and suitable for automotive lighting, industrial machine vision, and commercial signage requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT3932EUFD#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 since 1965.
The LT3932EUFD#TRPBF belongs to Analog Devices' Silent Switcher LED driver product line, engineered specifically for EMI-sensitive automotive and industrial lighting applications demanding high efficiency, precision current regulation, and robust fault handling.
FAQ
What is the maximum LED string voltage supported by the LT3932EUFD#TRPBF?
The LT3932EUFD#TRPBF supports 0 V to 36 V LED string voltage, enabling direct drive of 1–10 white LEDs in series from common 12 V or 24 V automotive supplies. This range is validated across the full –40°C to +125°C junction temperature range and includes margin for transient overvoltage events.
Does the LT3932EUFD#TRPBF require an external PMOS for PWM dimming?
No - the LT3932EUFD#TRPBF includes an internal PWM dimming generator and PWMTG output driver capable of directly controlling an external high-side PMOS. When RP is connected to GND and PWM is driven externally, no additional logic is needed; alternatively, applying 1 V–2 V to PWM generates internal dimming signals without external timing sources.
How does spread-spectrum frequency modulation work on the LT3932EUFD#TRPBF?
When the SYNC/SPRD pin is tied to INTVCC, the LT3932EUFD#TRPBF enables spread-spectrum frequency modulation, varying the switching frequency by ±25% around the RT-set center (e.g., 2 MHz becomes 1.5–2.5 MHz). This spreads energy across a wider bandwidth, reducing peak EMI amplitudes to meet CISPR 25 Class 5 requirements without added filtering.
Can the LT3932EUFD#TRPBF operate with input voltages below 3.6 V?
No - the absolute minimum input voltage for functional operation of the LT3932EUFD#TRPBF is 3.6 V, as specified in the Electrical Characteristics table. Below this, internal biasing fails and EN/UVLO remains inactive. For sub-3.6 V applications, consider the LT3922 or LT3762 families with lower VIN minima.
What is the purpose of the ISMON pin on the LT3932EUFD#TRPBF?
The ISMON pin on the LT3932EUFD#TRPBF provides a buffered voltage output equal to 10 mV per 1 mV of differential voltage between ISP and ISN - effectively scaling the LED current sense signal 10× for telemetry, closed-loop feedback, or diagnostic logging. It sinks/source ≤1 mA and operates rail-to-rail across the full temperature range.
LT3932EUFD#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)
LT3932EUFD#TRPBF FAQ
1.How can I place an order for LT3932EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3932EUFD#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#TRPBF reliable?
The price and inventory of LT3932EUFD#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3932EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3932EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3932EUFD#TRPBF?
LT3932EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3932EUFD#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#TRPBF?
For technical support, including LT3932EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3932EUFD#TRPBF requirements.
6.How does Aetrix verify that LT3932EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3932EUFD#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3932EUFD#TRPBF?
All LT3932EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3932EUFD#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#TRPBF part is unused and in its original packaging.
Return procedure for LT3932EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3932EUFD#TRPBF Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
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
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
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