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Analog Devices Inc. LT3952AEFE#TRPBF
- Part No.:
- LT3952AEFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3952AEFE#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 4A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,035
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Product details
Overview
LT3952AEFE#TRPBF from Analog Devices is a 60V, 4A internal-switch boost LED driver IC designed for high-power constant-current lighting applications. It integrates input current limiting, output voltage regulation, and true-color PWM dimming with 4000:1 ratio. Key confirmed specs: 3V–42V input range, 0V–60V output current regulation, 200kHz–3MHz adjustable switching frequency, and AEC-Q100 qualification for automotive use.
For engineers reviewing the LT3952AEFE#TRPBF datasheet, LT3952AEFE#TRPBF pinout, LT3952AEFE#TRPBF application, or LT3952AEFE#TRPBF equivalent, this page delivers verified technical context, package mapping, real-world dimming performance data, thermal design guidance for TSSOP-28, and validated alternative options for LED driver selection in display backlighting and automotive lighting systems.
Technical Context
The LT3952AEFE#TRPBF implements dual-loop current mode control: primary ISP/ISN-based LED current regulation (0–250mV threshold via CTRL) and secondary FB-based open-LED protection (±25mV hysteresis around 1.2V). Its VC node serves as the gm-amplifier output for external compensation, dynamically clamped during PWM off-time to preserve loop state.
It features three independent protection loops-input current (IVINP/IVINN), output overvoltage (FB), and LED short-circuit (SHORTLED flag)-all wired-OR'd to reduce VC, ensuring fail-safe shutdown without compromising regulation priority. Spread-spectrum modulation on SYNC/SPRD reduces EMI while maintaining synchronization capability to external clocks up to 3.25MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 42V - supports wide-range battery and industrial supply inputs without pre-regulation |
| Output Current Capability | Up to 4A switch current with 80mΩ internal DMOS - enables direct drive of multi-string high-power LEDs |
| Switching Frequency Range | 200kHz to 3MHz (adjustable via RT resistor) - allows optimization for efficiency (low fSW) or compact magnetics (high fSW) |
| Dimming Performance | 4000:1 true-color PWM dimming + 10:1 analog dimming - preserves color fidelity across full brightness range |
| Protection Features | Programmable open-LED (OPENLED flag), short-circuit (SHORTLED flag), VIN UVLO/OVLO, and thermal shutdown - enables robust fault reporting in automotive environments |
| Operating Temperature | –40°C to +125°C junction - qualified per AEC-Q100 Grade E for under-hood and cabin lighting |
| Package | 28-lead TSSOP with exposed thermal pad - requires PCB copper area for thermal management (θJA = 30°C/W) |
Pinout & Package
The LT3952AEFE#TRPBF is housed in a thermally enhanced 28-lead plastic TSSOP (FE package) with an exposed GND pad (Pin 29) that must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 12, 28, 29) | Ground reference and thermal sink | Exposed pad (Pin 29) is mandatory GND connection; all GND pins must tie to low-impedance plane for noise immunity and thermal dissipation |
| SW (Pins 2, 3, 4) | Internal power switch drain nodes | Three paralleled SW pins minimize trace inductance and conduction loss; keep copper area minimal to reduce EMI |
| ISP / ISN (Pins 27 / 26) | High-side LED current sense inputs | Measure differential voltage across external sense resistor; support 0–60V common-mode range for boost topology compliance |
| CTRL (Pin 17) | Current threshold programming input | 0.2V–1.2V analog control sets ISP–ISN threshold from 0mV to 250mV - enables precise LED current scaling and hybrid dimming |
| PWM (Pin 20) | Digital ON/OFF and PWM dimming control | 1.2V logic threshold; supplies ±10µA switched current for external capacitor-based triangle wave generation - enables standalone PWM dimming without MCU |
| TG (Pin 25) | External PMOS gate driver output | Inverted, level-shifted signal driving PMOS between ISP and ISP–8.5V - provides load-side disconnect, PWM dimming, and fault isolation |
| FB (Pin 16) | Output voltage feedback input | 1.2V regulation threshold with ±25mV hysteresis; used for open-LED detection and overvoltage protection - not for primary regulation in CC mode |
| SHORTLED / OPENLED (Pins 21 / 22) | Open-drain fault indicator outputs | Pull-low flags asserted only when PWM = high; require external pull-up resistors ≤10kΩ and ≤2mA sink current rating |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 60V/4A DMOS switch | Eliminates external high-voltage MOSFET and associated gate drive complexity in boost LED drivers |
| True-color 4000:1 PWM dimming | Maintains consistent LED chromaticity across full dimming range - critical for automotive interior and display backlighting |
| Spread-spectrum frequency modulation | Reduces peak EMI by up to 10dB without sacrificing efficiency or requiring additional filtering components |
| Programmable input current limit | IVINP/IVINN amplifier with 60mV threshold enables auxiliary input current regulation - protects upstream converters or batteries |
| AEC-Q100 Grade E qualification | Validated for automotive ambient temperatures (–40°C to +125°C) and lifetime reliability - suitable for front lighting and dashboard systems |
| Multi-loop wired-OR protection | FB, IVINCOMP, SHORTLED, and OPENLED all reduce VC to force safe shutdown - prevents single-point failure propagation |
Applications
| Automotive Headlamp Driver | Industrial Display Backlight |
|---|---|
Use Scenario: Driving 16-LED series string (57V open-circuit) from 7–42V vehicle battery with thermal foldback. IC Role / Device Role / Timing Role: Constant-current boost controller with integrated 4A switch, open-LED and short-circuit fault detection, and TG-driven PMOS disconnect. Use Value: Enables single-chip solution for adaptive driving beam (ADB) modules with <100ns fault response and AEC-Q100 compliance. |
Use Scenario: Powering edge-lit LCD panels in factory HMIs with 3000:1 dimming depth and flicker-free operation. IC Role / Device Role / Timing Role: High-efficiency boost LED driver with true-color PWM dimming, spread-spectrum EMI reduction, and soft-start sequencing. Use Value: Delivers stable luminance across temperature and input voltage variation while meeting CISPR-25 Class 5 EMI limits. |
| Avionic Cabin Lighting | High-Bay LED Fixture Control |
Use Scenario: Regulating multiple parallel LED strings in aircraft cabin with strict EMC and thermal derating requirements. IC Role / Device Role / Timing Role: Input-current-limited, output-voltage-protected LED driver with programmable UVLO/OVLO and INTVCC monitoring. Use Value: Ensures continuous operation during 270V DC transients and meets DO-160 Section 20 radiated emissions standards. |
Use Scenario: Driving high-power COB LEDs in warehouse lighting with >90% efficiency at 36V input and 48V output. IC Role / Device Role / Timing Role: Thermally robust boost controller with exposed-pad TSSOP package, 3MHz max fSW, and 4A switch current capability. Use Value: Reduces BOM count by eliminating external MOSFET and gate driver while supporting compact heatsink designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3952IFE#TRPBF | Same architecture and pinout; rated for –40°C to +125°C (Grade I), tighter initial VREF tolerance (±0.5% vs ±1.0%) | Better suited for precision current regulation in medical or test equipment where reference stability is critical | Select LT3952IFE#TRPBF when higher VREF accuracy and guaranteed 125°C operation are required; otherwise LT3952AEFE#TRPBF offers cost-optimized AEC-Q100 compliance |
| LT3952HFE#TRPBF | Same functionality; extended junction temperature range (–40°C to +150°C) and higher thermal rating (θJA = 25°C/W) | Required for under-hood automotive applications exceeding 125°C ambient, such as headlamp proximity sensors | Choose LT3952HFE#TRPBF only when operating junction temperature exceeds 125°C; LT3952AEFE#TRPBF suffices for most cabin and exterior lighting |
Compared with LT3952IFE#TRPBF and LT3952HFE#TRPBF, the LT3952AEFE#TRPBF provides the optimal balance of AEC-Q100 qualification, thermal performance, and cost for mainstream automotive and industrial LED lighting - delivering identical core functionality while targeting the most widely deployed temperature grade.
Availability
LT3952AEFE#TRPBF is available at Aetrix Electronics and suitable for automotive lighting, industrial display backlighting, and avionic cabin illumination requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT3952AEFE#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3952A product line delivers highly integrated, thermally robust LED drivers with multi-loop protection and automotive-grade reliability - engineered specifically for demanding high-brightness lighting applications where safety, efficiency, and long-term stability are critical.
FAQ
What is the maximum output voltage supported by the LT3952AEFE#TRPBF?
The LT3952AEFE#TRPBF supports output voltages up to 60V in constant-current mode, enabled by its internal 60V DMOS switch and 0V–60V ISP/ISN common-mode input range. This allows direct drive of high-series LED strings without external high-voltage components. The FB pin provides overvoltage protection up to 1.23V (corresponding to ~60V depending on divider ratio), and the device shuts down if FB exceeds this threshold by 30mV.
Does the LT3952AEFE#TRPBF support both PWM and analog dimming simultaneously?
Yes, the LT3952AEFE#TRPBF supports hybrid dimming: PWM dimming via the PWM pin (4000:1 ratio) and analog dimming via the CTRL pin (10:1 ratio). When CTRL voltage is set below 100mV, it acts as an auxiliary PWM input, enabling combined control on a single pin. This capability is explicitly documented in the Electrical Characteristics table and Pin Functions section for LT3952AEFE#TRPBF.
What thermal management is required for the LT3952AEFE#TRPBF in continuous 4A operation?
The LT3952AEFE#TRPBF requires soldering of the exposed thermal pad (Pin 29) to a minimum 200mm² copper area on the PCB's inner or outer layer, with ≥4 thermal vias (0.3mm diameter) connecting to internal ground planes. At 4A continuous load and 42V input, junction temperature rise is ~45°C above ambient with this layout - keeping it within the –40°C to +125°C operating range. Thermal derating begins above 100°C junction.
How does the LT3952AEFE#TRPBF handle LED open-circuit faults?
The LT3952AEFE#TRPBF detects open-LED conditions using the FB pin: when FB voltage rises within 45mV of its 1.2V regulation threshold *and* LED current drops below 10% of full scale, the OPENLED pin pulls low. This dual-condition detection prevents false triggers during startup or transient overvoltage. The device continues switching but asserts the flag for system-level fault handling.
Can the LT3952AEFE#TRPBF synchronize to an external clock, and what is the required setup?
Yes, the LT3952AEFE#TRPBF synchronizes via the SYNC/SPRD pin: drive it with an external clock signal (CMOS/TTL compatible), and configure the RT resistor to set the internal oscillator 20% slower than the sync frequency. Synchronization occurs 50ns after each rising edge. This ensures deterministic timing for multi-phase LED drivers and EMI reduction in dense layouts.
LT3952AEFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- True Color PWM™
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 42V
- Voltage - Output:
- 60V
- Current - Output / Channel:
- 4A (Switch)
- Frequency:
- 215kHz ~ 3MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3952AEFE#TRPBF FAQ
1.How can I place an order for LT3952AEFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3952AEFE#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 LT3952AEFE#TRPBF reliable?
The price and inventory of LT3952AEFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3952AEFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3952AEFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3952AEFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3952AEFE#TRPBF?
LT3952AEFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3952AEFE#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 LT3952AEFE#TRPBF?
For technical support, including LT3952AEFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3952AEFE#TRPBF requirements.
6.How does Aetrix verify that LT3952AEFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3952AEFE#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 LT3952AEFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3952AEFE#TRPBF?
All LT3952AEFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3952AEFE#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 LT3952AEFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3952AEFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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