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Analog Devices Inc. LT3952AIFE#TRPBF
- Part No.:
- LT3952AIFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3952AIFE#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 4A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,802
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Product details
Overview
LT3952AIFE#TRPBF from Analog Devices is a 60V, 4A synchronous boost LED driver IC with integrated DMOS power switch, dual current regulation (input and output), and constant-voltage feedback. It supports true-color PWM dimming up to 4000:1, operates from 3V–42V input, delivers up to 60V output, and is qualified for automotive AEC-Q100 Grade I (–40°C to +125°C) applications in display backlighting and avionic lighting.
For engineers reviewing the LT3952AIFE#TRPBF datasheet, LT3952AIFE#TRPBF pinout, LT3952AIFE#TRPBF application, or LT3952AIFE#TRPBF equivalent, key selection considerations include its 28-lead TSSOP thermally enhanced package, spread-spectrum EMI reduction, programmable 200kHz–3MHz switching frequency, internal PMOS gate driver (TG), and dual fault flags (SHORTLED/OPENLED).
Technical Context
The LT3952AIFE#TRPBF implements a current-mode boost topology with three independent regulation loops: output current (via ISP/ISN and CTRL), input current (via IVINP/IVINN), and output voltage (via FB). All loops feed into a wired-OR VC node that controls the internal 60V/80mΩ NMOS switch.
It integrates an internal 2V reference (VREF), soft-start (SS), spread-spectrum modulation (SYNC/SPRD), and a self-contained PWM generator (DIM/PWM pins) enabling standalone dimming without external microcontroller control. The TG driver provides level-shifted, inverted gate drive for external PMOS disconnect switches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 42V - supports wide-range industrial and automotive battery inputs including 12V/24V systems. |
| Output Voltage Capability | 0V to 60V - enables driving long LED strings (e.g., 16× 50V LEDs) in boost configuration. |
| Switch Current Limit | 4A typical, 4.5A max - sets peak inductor current limit; determines maximum LED power delivery capability. |
| Switch On-Resistance | 80mΩ at 500mA - defines conduction loss and thermal dissipation under load. |
| Dimming Ratio | 4000:1 true-color PWM - ensures flicker-free, high-fidelity color rendering in display backlighting. |
| Operating Temp Range | –40°C to +125°C - meets AEC-Q100 Grade I requirements for under-hood and cabin lighting. |
| Switching Frequency Range | 200kHz to 3MHz - allows optimization of magnetics size vs. efficiency; synchronizable to external clock. |
Pinout & Package
LT3952AIFE#TRPBF is housed in a thermally enhanced 28-lead plastic TSSOP package (FE) with exposed pad (Pin 29) soldered to PCB ground for thermal and electrical integrity. θJA = 30°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 12, 28, 29) | Ground reference and thermal sink | Exposed pad must be soldered to large copper area; all GND pins share same net for low-impedance return path. |
| SW (Pins 2, 3, 4) | Internal NMOS switch drain nodes | High di/dt switching nodes; minimize copper area to reduce EMI and parasitic inductance. |
| ISP / ISN (Pins 27 / 26) | Output current sense differential inputs | Measure LED current via external sense resistor; full-scale threshold set by CTRL (0–250mV range). |
| CTRL (Pin 17) | Current sense threshold adjust | 0.2V–1.2V input sets ISP–ISN regulation point; <100mV enables auxiliary PWM dimming on same pin. |
| TG (Pin 25) | PMOS gate driver output | Inverted, level-shifted signal drives external PMOS between VISP and VISP–8.5V for LED disconnect and PWM dimming. |
| PWM (Pin 20) | Digital ON/OFF and PWM dimming control | 1.2V logic threshold; also sources/sinks ±10µA to generate triangle wave on external capacitor for internal PWM generator. |
| FB (Pin 16) | Output voltage feedback | Regulates output voltage at 1.2V reference; used for open-LED protection (asserts OPENLED when VFB nears 1.2V and current drops). |
| SHORTLED / OPENLED (Pins 21 / 22) | Open-drain fault flag outputs | Active-low indicators: SHORTLED asserts on overcurrent (>375mV ISP–ISN); OPENLED asserts on open-circuit condition. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 60V/4A NMOS switch | Eliminates need for external high-voltage power switch; reduces BOM count and layout complexity in LED driver designs. |
| Programmable spread-spectrum modulation | Reduces peak EMI by up to 10dB without compromising efficiency-critical for automotive EMC compliance. |
| Independent input & output current regulation | Enables robust system-level protection: IVINP/IVINN limits input current; ISP/ISN regulates LED current precisely. |
| Internal PWM generator with DIM control | Delivers 4000:1 dimming using only one analog voltage (DIM pin), removing dependency on MCU or external PWM source. |
| AEC-Q100 Grade I qualification | Validated for automotive ambient temperatures (–40°C to +125°C junction), supporting headlight, DRL, and interior lighting. |
Applications
| Automotive Headlamp Driver | Avionic Display Backlight |
|---|---|
|
Use Scenario: Driving high-brightness white LED arrays in adaptive front-lighting systems (AFS) with dynamic beam shaping. IC Role / Device Role / Timing Role: Primary boost controller regulating LED current while monitoring input supply and detecting short/open faults in real time. Use Value: 4A switch current and 60V output support multi-string configurations; SHORTLED/OPENLED flags enable fail-safe diagnostics per ISO 26262 ASIL-B requirements. |
Use Scenario: Powering high-contrast LCD backlights in cockpit displays requiring stable luminance across wide temperature ranges. IC Role / Device Role / Timing Role: Constant-current LED driver with true-color PWM dimming synchronized to display frame rate. Use Value: 4000:1 dimming ratio preserves grayscale fidelity; AEC-Q100 qualification ensures reliability in vibration- and temperature-cycled environments. |
| Industrial Machine Vision Lighting | Commercial Signage Power Supply |
|
Use Scenario: High-intensity strobed illumination for barcode readers and inspection cameras requiring precise timing and intensity control. IC Role / Device Role / Timing Role: Fast-response current regulator triggered by external PWM signal; TG pin controls external PMOS for microsecond-level LED turn-on/off. Use Value: 75ns minimum on-time and 50ns minimum off-time enable sub-millisecond pulse control; internal slope compensation ensures stability at high duty cycles. |
Use Scenario: Modular LED signage with variable string lengths and mixed-color (RGBW) channels requiring flexible, fault-tolerant drivers. IC Role / Device Role / Timing Role: Multi-loop regulator managing both LED current and bus voltage; OPENLED/SHORTLED provide channel-level health reporting. Use Value: Dual regulation loops prevent overvoltage during open-circuit failure; programmable OVLO/UVLO adapts to varying input sources (12V/24V/48V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3952EFE#TRPBF | Same architecture but rated for 0°C to +125°C (non-automotive grade); lacks AEC-Q100 qualification. | Suitable for commercial/industrial lighting where extended temperature range is not required. | Select LT3952EFE#TRPBF only if AEC-Q100 compliance is unnecessary and cost sensitivity outweighs automotive reliability assurance. |
| LT3761EFE#TRPBF | Legacy 60V LED driver with 3.3A switch, no spread spectrum, no internal PWM generator, and no IVINP/IVINN input current sensing. | Limited to basic constant-current operation; requires external PWM source and offers lower integration. | Choose LT3761EFE#TRPBF only for legacy redesigns where footprint compatibility is critical and advanced features are unused. |
Compared with LT3952EFE#TRPBF and LT3761EFE#TRPBF, the LT3952AIFE#TRPBF uniquely combines AEC-Q100 qualification, integrated spread-spectrum EMI reduction, and self-contained PWM generation-enabling smaller, safer, and more autonomous LED driver designs in automotive and high-reliability systems.
Availability
LT3952AIFE#TRPBF is available at Aetrix Electronics and suitable for automotive lighting, avionic display backlighting, and industrial machine vision applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT3952AIFE#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 family is designed specifically for high-power LED driving in demanding environments-emphasizing fault resilience, EMI control, and multi-loop regulation for automotive-grade reliability and precision.
FAQ
What is the operating temperature range for LT3952AIFE#TRPBF?
The LT3952AIFE#TRPBF is rated for –40°C to +125°C junction temperature and is AEC-Q100 Grade I qualified. This makes it suitable for under-hood automotive applications and avionic environments where thermal extremes are common. Its thermal design relies on proper soldering of the exposed pad (Pin 29) to a large PCB copper area to maintain θJA = 30°C/W.
Does LT3952AIFE#TRPBF support both analog and PWM dimming simultaneously?
Yes, the LT3952AIFE#TRPBF supports combined analog and PWM dimming. Applying a DC voltage to the CTRL pin sets the full-scale current, while the PWM pin accepts external pulses for high-ratio dimming. Additionally, the CTRL pin functions as an auxiliary PWM input below 100mV, enabling single-pin hybrid dimming control in space-constrained layouts.
How does the LT3952AIFE#TRPBF handle LED open-circuit faults?
The LT3952AIFE#TRPBF detects open-LED conditions using the FB pin: when VFB rises within 45mV of its 1.2V regulation threshold *and* LED current falls below 10% of full scale, the OPENLED pin pulls low. This dual-condition detection prevents false triggers during transient overvoltage events and ensures reliable fault signaling in safety-critical lighting systems.
Can LT3952AIFE#TRPBF drive multiple LED strings in parallel?
The LT3952AIFE#TRPBF is optimized for single-string constant-current operation. Driving parallel LED strings requires individual current sensing per string to ensure matching-something the LT3952AIFE#TRPBF does not support natively. For multi-string applications, use one LT3952AIFE#TRPBF per string or consider a multi-channel controller like the LT3743.
What is the purpose of the TG pin on LT3952AIFE#TRPBF?
The TG pin on the LT3952AIFE#TRPBF is a level-shifted, inverted gate driver output that controls an external PMOS transistor placed between the LED cathode and ground. It enables active LED disconnect during fault conditions, PWM dimming without modulating the boost converter, and safe hot-plug operation-enhancing system safety and dimming fidelity beyond what the internal switch alone can provide.
LT3952AIFE#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
LT3952AIFE#TRPBF FAQ
1.How can I place an order for LT3952AIFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3952AIFE#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 LT3952AIFE#TRPBF reliable?
The price and inventory of LT3952AIFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3952AIFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3952AIFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3952AIFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3952AIFE#TRPBF?
LT3952AIFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3952AIFE#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 LT3952AIFE#TRPBF?
For technical support, including LT3952AIFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3952AIFE#TRPBF requirements.
6.How does Aetrix verify that LT3952AIFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3952AIFE#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 LT3952AIFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3952AIFE#TRPBF?
All LT3952AIFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3952AIFE#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 LT3952AIFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3952AIFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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