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Analog Devices Inc. LT3952AEFE#PBF
- Part No.:
- LT3952AEFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3952AEFE#PBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 4A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:313
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Product details
Overview
LT3952AEFE#PBF from Analog Devices is a 60V, 4A synchronous boost LED driver IC with integrated DMOS power switch, constant-current/constant-voltage regulation, and programmable spread-spectrum modulation. It operates from 3V–42V input, delivers up to 60V output, and supports 4000:1 true-color PWM dimming for high-fidelity lighting control in automotive headlamps and display backlights.
For engineers reviewing the LT3952AEFE#PBF datasheet, LT3952AEFE#PBF pinout, LT3952AEFE#PBF application, or LT3952AEFE#PBF equivalent, key selection criteria include its 28-lead TSSOP thermal performance, dual current-sense architecture (ISP/ISN + IVINP/IVINN), AEC-Q100 qualification, and integrated PMOS gate driver for load-side disconnect.
Technical Context
The LT3952AEFE#PBF implements a fixed-frequency current-mode boost topology with three independent regulation loops: output current (via ISP/ISN and CTRL), input current (via IVINP/IVINN and IVINCOMP), and output voltage (via FB). All loops feed into a shared VC node in wired-OR configuration, ensuring fault-safe prioritization where auxiliary loops only clamp-never boost-VC.
Its internal 60V/80mΩ NMOS switch enables high-efficiency operation up to 3MHz switching frequency (set by RT resistor or external SYNC clock), while spread-spectrum modulation on the SYNC/SPRD pin reduces EMI without sacrificing efficiency. The integrated TG driver provides level-shifted, inverted PWM output capable of driving external PMOS switches for LED ON/OFF control and short-circuit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 42V - supports wide-range battery inputs including 12V/24V automotive systems and industrial DC rails. |
| Output Current Capability | Up to 4A - set via external sense resistor and CTRL pin voltage; full-scale accuracy ±2% over temperature. |
| Switching Frequency Range | 200kHz to 3MHz - adjustable via RT resistor or synchronizable to external clock; enables optimization for size (high-f) or efficiency (low-f). |
| Integrated Power Switch | 60V, 80mΩ NMOS - eliminates external high-side switch; supports LED strings up to 57V open-circuit voltage. |
| Dimming Ratio | 4000:1 true-color PWM - achieved via dedicated PWM pin with internal generator; preserves color fidelity across brightness range. |
| Operating Junction Temp | –40°C to +125°C - qualified per AEC-Q100 Grade E; suitable for under-hood automotive lighting and industrial environments. |
| Package Thermal Resistance | θJA = 30°C/W - enabled by exposed pad (Pin 29) soldered to PCB ground plane; critical for sustained 4A operation. |
Pinout & Package
LT3952AEFE#PBF is housed in a thermally enhanced 28-lead plastic TSSOP package (FE) with an exposed GND pad (Pin 29) that must be soldered to PCB copper for thermal and electrical integrity. Package dimensions: 9.7mm × 4.4mm × 1.1mm.
| 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; provides primary thermal path and low-impedance return for SW, ISP, and ISN currents. |
| SW (Pins 2, 3, 4) | Power switch drain nodes | Three paralleled pins reduce conduction loss and EMI; require minimal copper area to limit parasitic inductance. |
| ISP / ISN (Pins 27 / 26) | High-side output current sense inputs | Measure voltage drop across external sense resistor; support 0–60V common-mode range and full-scale accuracy ±2%. |
| CTRL (Pin 17) | Current threshold reference input | 0.2V–1.2V analog control sets ISP–ISN threshold from 0mV to 250mV; below 100mV enables auxiliary PWM dimming. |
| TG (Pin 25) | PMOS gate driver output | Inverted, level-shifted PWM signal; drives external PMOS between VISP and VISP–8.5V for LED disconnect and fault isolation. |
| PWM (Pin 20) | Digital dimming and enable control | 1.2V logic threshold; enables 4000:1 PWM dimming and controls internal oscillator, TG, and VC impedance state. |
| FB (Pin 16) | Output voltage feedback input | 1.2V reference comparator; used for open-LED protection (asserts OPENLED flag when VFB within 45mV of regulation point). |
| SHORTLED / OPENLED (Pins 21 / 22) | Open-drain fault status outputs | Active-low flags indicate LED short-circuit (SHORTLED) or open-circuit (OPENLED); updated only when PWM = high. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable spread-spectrum modulation | Reduces peak EMI by up to 10dB without requiring external filters; enabled by tying SYNC/SPRD to INTVCC. |
| Dual current regulation loops | Simultaneous ISP/ISN (output) and IVINP/IVINN (input) sensing enables robust overload protection and accurate input power limiting. |
| Integrated PMOS gate driver (TG) | Drives external PMOS for load-side disconnect during faults or PWM off-time; eliminates need for discrete high-side driver IC. |
| AEC-Q100 qualified (Grade E) | Validated for automotive applications including headlamps and interior lighting; includes extended temperature testing and failure mode analysis. |
| True-color PWM dimming | 4000:1 ratio achieved via dedicated PWM pin and internal triangle-wave generator; avoids color shift seen in analog-only dimming. |
| Wired-OR loop architecture | Prevents conflicting regulation: FB, IVINCOMP, and CTRL loops only pull VC down - never up - ensuring safe fault response. |
Applications
| Automotive Headlamp Control | Industrial Display Backlighting |
|---|---|
Use Scenario: Driving high-brightness LED arrays in adaptive front-lighting systems (AFS) with dynamic beam shaping and matrix control. IC Role / Device Role / Timing Role: Constant-current LED driver with fast PWM response (<100ns TG rise/fall), open/short LED fault detection, and AEC-Q100 compliance. Use Value: Enables precise lumen control across 4000:1 dimming range while maintaining color temperature stability and meeting automotive EMI standards. | Use Scenario: Powering large-area LCD backlights in medical imaging displays and industrial HMIs requiring uniform brightness and flicker-free operation. IC Role / Device Role / Timing Role: High-efficiency boost converter with dual-loop regulation (current + voltage), soft-start, and thermal foldback. Use Value: Delivers stable 57V/333mA output with <±2% current accuracy over temperature, eliminating visible brightness variation across display zones. |
| Avionic Cabin Lighting | Accurate Current-Limited Voltage Regulator |
Use Scenario: Controlling LED-based ambient and task lighting in commercial aircraft cabins with strict DO-160E EMI and thermal requirements. IC Role / Device Role / Timing Role: Robust LED driver with spread-spectrum modulation, 125°C junction rating, and fault-flag reporting (SHORTLED/OPENLED). Use Value: Meets aviation EMI Class D limits and provides real-time fault diagnostics via open-drain flags for system-level health monitoring. | Use Scenario: Providing tightly regulated 24V/2A output for precision analog sensor biasing where current limiting must not compromise voltage stability. IC Role / Device Role / Timing Role: Dual-mode regulator using FB for voltage setpoint and ISP/ISN for current limit enforcement; wired-OR loop prevents overvoltage during current-limit events. Use Value: Guarantees ≤250mV overvoltage excursion during current-limit activation, protecting downstream op-amps and ADC references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EFE#PBF | Fixed 500kHz frequency; no spread-spectrum; no integrated 60V switch - requires external MOSFET; supports SEPIC/Cuk topologies. | Better suited for multi-topology designs needing VIN > VOUT capability; lacks AEC-Q100 qualification and TG driver. | Select LTC3783EFE#PBF only if topology flexibility (SEPIC) outweighs need for integrated switch, automotive qualification, and EMI reduction. |
| LM3409QMH/NOPB | 40V max switch voltage; 3.5A max switch current; no input current sense; no spread-spectrum; SO-8 package (higher θJA). | Targeted at cost-sensitive, lower-power automotive lighting; lacks dual-loop regulation and open-drain fault flags. | Choose LM3409QMH/NOPB for non-critical 12V LED applications where 60V headroom and AEC-Q100 are unnecessary. |
Compared with LTC3783EFE#PBF and LM3409QMH/NOPB, the LT3952AEFE#PBF uniquely integrates a 60V/4A switch, AEC-Q100 qualification, spread-spectrum EMI reduction, and dual current-sense loops - making it the only option among the three qualified for high-reliability automotive headlamp systems requiring simultaneous input/output current monitoring and fault-flag reporting.
Availability
LT3952AEFE#PBF is available at Aetrix Electronics and suitable for automotive lighting, industrial display backlighting, and avionic cabin lighting requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT3952AEFE#PBF 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 was designed specifically for high-power LED driving in harsh environments, combining robust protection features, automotive-grade reliability, and flexible regulation architecture for both constant-current and constant-voltage operation.
FAQ
What is the maximum output voltage supported by the LT3952AEFE#PBF?
The LT3952AEFE#PBF supports up to 60V output voltage, as confirmed by its 60V-rated internal DMOS switch and absolute maximum ratings for ISP and SW pins. In typical applications, it regulates LED strings up to 57V open-circuit voltage while maintaining constant-current operation and open-LED protection via the FB pin.
Does the LT3952AEFE#PBF support analog dimming in addition to PWM dimming?
Yes, the LT3952AEFE#PBF supports 10:1 analog dimming via the CTRL pin (0.2V–1.2V range adjusts ISP–ISN threshold from 0mV to 250mV), and also enables combined analog/PWM dimming: when CTRL voltage falls below 100mV, the pin functions as an auxiliary PWM input, allowing single-pin hybrid dimming control.
How does the LT3952AEFE#PBF handle LED short-circuit faults?
The LT3952AEFE#PBF detects LED short-circuit faults via the ISP/ISN current sense amplifier: when VISP–ISN exceeds 375mV (typical overcurrent threshold), switching is immediately disabled, TG is pulled high to disconnect the PMOS, and the SHORTLED pin pulls low. The device remains latched until the next soft-start cycle initiated by PWM rising edge.
What is the role of the IVINP and IVINN pins on the LT3952AEFE#PBF?
The IVINP and IVINN pins form an auxiliary current-sense amplifier that monitors input current independently of output current. When the IVINP–IVINN differential exceeds 60mV, the IVINCOMP pin rises to 1.2V, reducing VC and limiting input power - providing critical overload protection for the input source and enabling accurate input power regulation in buck-boost or battery-fed systems.
Can the LT3952AEFE#PBF be synchronized to an external clock, and what is the required setup?
Yes, the LT3952AEFE#PBF can be synchronized to an external clock via the SYNC/SPRD pin. To do so, drive SYNC/SPRD with a clean CMOS clock signal, and configure the RT resistor to set the internal oscillator frequency 20% lower than the external SYNC frequency. Synchronization occurs 50ns after each rising edge of the SYNC signal, ensuring deterministic switch timing.
LT3952AEFE#PBF 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:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT3952AEFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3952AEFE#PBF 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#PBF reliable?
The price and inventory of LT3952AEFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3952AEFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3952AEFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3952AEFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3952AEFE#PBF?
LT3952AEFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3952AEFE#PBF 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#PBF?
For technical support, including LT3952AEFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3952AEFE#PBF requirements.
6.How does Aetrix verify that LT3952AEFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3952AEFE#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT3952AEFE#PBF?
All LT3952AEFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3952AEFE#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT3952AEFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3952AEFE#PBF Tags
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