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Analog Devices Inc. LT3922HUFD-1#TRPBF
- Part No.:
- LT3922HUFD-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3922HUFD-1#TRPBF.pdf
- Description:
- IC LED DRVR CTRLR PWM 2.3A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,805
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Product details
Overview
LT3922HUFD-1#TRPBF from Analog Devices is a monolithic synchronous step-up LED driver IC with integrated 2.3A/40V power switches, ±2.5% LED current regulation, 25,000:1 PWM dimming capability at 100Hz, and AEC-Q100 qualification for automotive lighting systems operating up to 150°C junction temperature.
For engineers reviewing the LT3922HUFD-1#TRPBF datasheet, LT3922HUFD-1#TRPBF pinout, LT3922HUFD-1#TRPBF application, or LT3922HUFD-1#TRPBF equivalent, key selection criteria include input voltage range (2.8V–36V), programmable switching frequency (200kHz–2MHz), internal PWM dimming accuracy (±10.5%), open/short LED fault detection, and thermal performance in 28-lead 4mm × 5mm QFN package.
Technical Context
The LT3922HUFD-1#TRPBF implements fixed-frequency peak current mode control with dual internal MOSFETs (140mΩ bottom, 155mΩ top) and Silent Switcher® architecture to minimize EMI. It supports boost, buck, and buck-boost topologies via external component configuration.
It integrates analog/digital CTRL pin interface for LED current programming, dedicated PWM driver (PWMTG) for external high-side PMOS dimming, internal PWM generator (7.34–129Hz), and comprehensive protection including open-circuit (FB >1.14V), short-circuit (ISP–ISN >150mV), overvoltage (FB >1.266V), and thermal shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8V to 36V - supports wide automotive battery transients and industrial DC supplies without pre-regulation. |
| LED Current Regulation Accuracy | ±2.5% - ensures consistent luminance across temperature and line/load variations in safety-critical lighting. |
| Switching Frequency Range | 200kHz to 2MHz - enables optimization of efficiency vs. size using RT resistor or external SYNC clock. |
| PWM Dimming Ratio | 25,000:1 at 100Hz - delivers ultra-fine brightness control for machine vision and adaptive front lighting. |
| Junction Temperature Range | –40°C to +150°C - qualified per AEC-Q100 Grade H for under-hood automotive applications. |
| Internal Power Switches | 2.3A peak, 40V rating, 140mΩ/155mΩ RDS(on) - eliminates need for external high-current switches in compact LED strings. |
| Fault Reporting | Open/short LED detection with open-drain FAULT pin - enables system-level diagnostics and fail-safe response. |
Pinout & Package
LT3922HUFD-1#TRPBF is housed in a thermally enhanced 28-lead (4mm × 5mm) plastic QFN package with exposed pad (Pin 29) soldered to PCB ground for optimal thermal dissipation (θJA = 25°C/W on demo board DC2247A).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1, 2, 24, 25) | Switch Node | Internally connected to both power MOSFETs; must be tied together and routed with low-inductance layout for EMI control. |
| BST (Pin 3) | Bootstrap Supply | Drives top switch gate; requires 33nF ceramic capacitor to SW for reliable high-side operation. |
| ISP / ISN (Pins 10, 11) | Current Sense Inputs | Kelvin-connected across external sense resistor to enable ±2.5% LED current regulation accuracy. |
| CTRL (Pin 8) | LED Current Programming | Accepts analog voltage (0.25–1.25V) or digital pulse duty cycle (12.5–62.5%) to set regulated LED current. |
| PWM / PWMTG (Pins 19, 20) | PWM Control & Output | PWM pin accepts external signal or analog voltage (1–2V); PWMTG drives external high-side PMOS for 25,000:1 dimming. |
| RT (Pin 16) | Frequency Setting | Resistor to GND sets switching frequency from 200kHz to 2MHz; critical for EMI compliance and inductor sizing. |
| FAULT (Pin 14) | Fault Indicator | Open-drain output pulled low on open LED, short LED, or overvoltage - enables system-level fault logging. |
| GND (Pins 22, 23, 29) | Ground Reference | All GND pins-including exposed thermal pad-must be soldered to PCB ground plane for thermal and noise integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Reduces radiated EMI by >20dB via magnetic field cancellation-enables compliance with CISPR 25 Class 5 without shielding. |
| Spread Spectrum Frequency Modulation | 100–125% frequency dithering when SYNC/SPRD = INTVCC-lowers peak EMI emissions across entire band. |
| Integrated 2.3A Power Switches | Eliminates external high-current MOSFETs and associated gate drive complexity in space-constrained LED modules. |
| AEC-Q100 Grade H Qualification | Validated for –40°C to +150°C operation-supports engine compartment and headlamp placement in automotive designs. |
| 128:1 Internal PWM Dimming | On-chip PWM generator (7.34–129Hz) with ±10.5% accuracy-reduces BOM count and timing jitter vs. external controllers. |
| Comprehensive Fault Protection | Detects open-circuit (FB >1.14V), short-circuit (ISP–ISN >150mV), and overvoltage (FB >1.266V) with latchoff/hiccup options. |
Applications
| Automotive Adaptive Front Lighting | Industrial Machine Vision Illumination |
|---|---|
Use Scenario: High-intensity LED arrays in automotive headlamps requiring dynamic beam shaping and glare-free illumination. IC Role / Device Role / Timing Role: Primary LED current regulator and PWM dimming controller with AEC-Q100 reliability and thermal robustness. Use Value: Enables 25,000:1 dimming ratio and ±2.5% current regulation across –40°C to +150°C for ASIL-B compliant lighting systems. |
Use Scenario: Stroboscopic LED lighting synchronized to camera exposure in automated optical inspection systems. IC Role / Device Role / Timing Role: Precision current source with fast PWM recovery and low-jitter internal timing for repeatable image capture. Use Value: Delivers <140ns PWM-to-PWMTG propagation delay and 100Hz dimming with sub-microsecond edge fidelity for motion blur elimination. |
| Commercial LED Signage | Avionics Cabin Lighting |
Use Scenario: Outdoor full-color LED displays subject to wide ambient temperature swings and solar heating. IC Role / Device Role / Timing Role: Synchronous boost LED driver supporting multi-string configurations with open/short fault reporting. Use Value: Maintains ±2.5% current regulation over 2.8V–36V input and 0–34V LED string voltage, ensuring color consistency. |
Use Scenario: Dimmable cabin lighting in commercial aircraft requiring EMI compliance and extended lifetime reliability. IC Role / Device Role / Timing Role: Low-EMI LED driver with spread spectrum modulation and fault-safe shutdown for DO-160 Section 20 compliance. Use Value: Achieves CISPR 25 Class 5 radiated emissions margin using Silent Switcher architecture-no added shielding required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3922IUFD-1#TRPBF | Same architecture and pinout; rated for –40°C to +125°C junction temperature (Grade I). | Not qualified for under-hood automotive use; suitable for interior lighting and industrial enclosures. | Select when thermal derating above 125°C is not required and cost optimization is prioritized. |
| LT3761EFE#TRPBF | Asynchronous boost LED driver; 3.3A peak switch, no integrated top MOSFET; 200kHz–1MHz frequency range. | Lacks Silent Switcher EMI reduction, internal PWM generator, and AEC-Q100 qualification. | Choose for lower-cost, non-automotive applications where external diode is acceptable and EMI filtering budget exists. |
Compared with LT3922IUFD-1#TRPBF and LT3761EFE#TRPBF, the LT3922HUFD-1#TRPBF uniquely combines AEC-Q100 Grade H qualification, integrated synchronous switches, Silent Switcher EMI suppression, and 25,000:1 PWM dimming-making it the only option for high-reliability, thermally demanding automotive front lighting.
Availability
LT3922HUFD-1#TRPBF is available at Aetrix Electronics and suitable for automotive adaptive lighting, industrial machine vision systems, commercial LED signage, and avionics cabin lighting requiring stable component supply and long-term production continuity.
Supply support for LT3922HUFD-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 LT3922 family is designed specifically for high-efficiency, high-dimming-ratio LED lighting in thermally constrained environments-emphasizing EMI reduction, fault resilience, and AEC-Q100 compliance for automotive front-end applications.
FAQ
What is the maximum LED string voltage supported by the LT3922HUFD-1#TRPBF?
The LT3922HUFD-1#TRPBF supports up to 34V LED string voltage, enabling driving of 10–12 white LEDs in series at typical forward voltages. This is achieved through its 40V-rated internal power switches and precise voltage regulation via the FB pin network, ensuring safe operation within absolute maximum ratings while maintaining ±2.5% current accuracy.
How does the LT3922HUFD-1#TRPBF achieve 25,000:1 PWM dimming?
The LT3922HUFD-1#TRPBF achieves 25,000:1 PWM dimming by combining an external high-side PMOS driven by the PWMTG pin with precise 100Hz external PWM pulses applied to the PWM pin. Its proprietary circuitry ensures rapid LED current recovery between pulses, minimizing duty-cycle error and enabling ultra-low 0.004% minimum on-time without flicker or color shift.
What thermal design considerations apply to the LT3922HUFD-1#TRPBF in automotive applications?
For automotive use, the LT3922HUFD-1#TRPBF requires full soldering of its exposed thermal pad (Pin 29) to a multilayer PCB ground plane with ≥6 thermal vias. Its Grade H rating (–40°C to +150°C) demands careful thermal modeling-especially at high ambient temperatures-to ensure junction temperature remains below 150°C during continuous 2.3A operation, as validated per AEC-Q100 test conditions.
Can the LT3922HUFD-1#TRPBF operate in buck or buck-boost topology?
Yes, the LT3922HUFD-1#TRPBF supports buck and buck-boost configurations via external component reconfiguration, as documented in the Applications Information section. Its synchronous dual-switch architecture and flexible feedback (FB) and current sense (ISP/ISN) inputs allow topology re-use without changing the IC-enabling single-part logistics across multiple lighting subsystems.
What protection features does the LT3922HUFD-1#TRPBF provide for LED string faults?
The LT3922HUFD-1#TRPBF provides open-circuit detection (FB >1.14V with ISP–ISN <10mV), short-circuit detection (ISP–ISN >150mV for >300µs), and overvoltage lockout (FB >1.266V). These trigger an open-drain FAULT pin pull-down, and fault response (hiccup restart or latchoff) is configured via the SS pin resistor-ensuring fail-safe behavior in mission-critical lighting.
LT3922HUFD-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 Controller
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.8V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- -
- Current - Output / Channel:
- 2.3A
- 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)
LT3922HUFD-1#TRPBF FAQ
1.How can I place an order for LT3922HUFD-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3922HUFD-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 LT3922HUFD-1#TRPBF reliable?
The price and inventory of LT3922HUFD-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 LT3922HUFD-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3922HUFD-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3922HUFD-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3922HUFD-1#TRPBF?
LT3922HUFD-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3922HUFD-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 LT3922HUFD-1#TRPBF?
For technical support, including LT3922HUFD-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3922HUFD-1#TRPBF requirements.
6.How does Aetrix verify that LT3922HUFD-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3922HUFD-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 LT3922HUFD-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3922HUFD-1#TRPBF?
All LT3922HUFD-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3922HUFD-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 LT3922HUFD-1#TRPBF part is unused and in its original packaging.
Return procedure for LT3922HUFD-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3922HUFD-1#TRPBF Tags
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BCR420UE6433HTMA1
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HV9910CLG-G
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