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Analog Devices Inc. LT3952AHFE#TRPBF
- Part No.:
- LT3952AHFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3952AHFE#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 4A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,239
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Product details
Overview
LT3952AHFE#TRPBF from Analog Devices is a 60V, 4A internal DMOS step-up DC/DC LED driver IC with integrated current/voltage regulation, programmable switching frequency (200kHz–3MHz), and AEC-Q100 qualification for automotive lighting. It supports true-color PWM dimming up to 4000:1, open-LED and short-circuit protection, and operates across 3V–42V input while delivering regulated output current up to 4A into high-voltage LED strings.
For engineers reviewing the LT3952AHFE#TRPBF datasheet, LT3952AHFE#TRPBF pinout, LT3952AHFE#TRPBF application, or LT3952AHFE#TRPBF equivalent, key selection criteria include its 150°C junction-rated TSSOP package, dual-loop (input/output current + voltage) regulation architecture, spread-spectrum EMI reduction, and PMOS gate driver for load-side disconnect-critical for automotive backlighting and avionic lighting designs requiring robust fault handling and thermal resilience.
Technical Context
The LT3952AHFE#TRPBF implements a fixed-frequency current-mode boost topology with three independent regulation loops: output current (via ISP/ISN and CTRL), output voltage (via FB), and input current (via IVINP/IVINN). Its VC node serves as the wired-OR summing point where all loop error amplifiers converge to control peak switch current.
It integrates a 60V/80mΩ NMOS power switch, a level-shifted TG output for external PMOS load disconnect, and dual dimming interfaces: analog (CTRL pin, 10:1 range) and digital (PWM pin, 4000:1). Spread-spectrum modulation on SYNC/SPRD reduces conducted EMI without sacrificing efficiency or component size optimization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Output Voltage | 60V - supports long LED strings (e.g., 16× 50V LEDs) without external HV components |
| Switch Current Limit | 4.5A typical - enables high-power LED driving with margin above 4A rated output |
| Input Voltage Range | 3V to 42V - compatible with 12V/24V automotive batteries including cold-crank and load-dump transients |
| Operating Junction Temp | –40°C to +150°C - qualified per AEC-Q100 Grade H, enabling under-hood deployment |
| Dimming Ratio | 4000:1 PWM - preserves color fidelity in display backlighting via true-color PWM™ technology |
| Switching Frequency | 200kHz to 3MHz - adjustable via RT resistor; supports compact magnetics or low-noise operation |
| Protection Features | OPENLED/SHORTLED flags, VIN UVLO/OVLO, INTVCC UVLO, thermal shutdown - autonomous fault detection with dedicated open-drain outputs |
Pinout & Package
The LT3952AHFE#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 path | Exposed pad (Pin 29) must be soldered to large copper area for thermal management and noise immunity |
| SW (Pins 2, 3, 4) | Internal NMOS switch drain | High di/dt node; requires minimized copper area to reduce EMI and switching losses |
| ISP / ISN (Pins 27 / 26) | Output current sense differential inputs | Measure LED current with 250mV full-scale threshold; support high-side or low-side sensing |
| CTRL (Pin 17) | Current sense threshold adjust | 0.2V–1.2V input sets VISP–ISN regulation point from 0mV to 250mV; <100mV enables auxiliary PWM mode |
| TG (Pin 25) | PMOS gate driver output | Inverted, level-shifted signal driving external PMOS between VISP and VISP–8.5V for load disconnect and PWM dimming |
| FB (Pin 16) | Output voltage feedback | 1.2V reference comparator; used for overvoltage protection and open-LED detection (±25mV hysteresis) |
| PWM (Pin 20) | Digital dimming and enable | 1.2V logic threshold; controls switching, TG state, and internal PWM generator (230Hz base frequency) |
| OPENLED / SHORTLED (Pins 22 / 21) | Fault flag outputs | Open-drain indicators asserted during open-circuit or overcurrent faults; updated only when PWM = high |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 60V/80mΩ NMOS switch | Eliminates external high-voltage MOSFET, reducing BOM count and layout complexity for boost LED drivers |
| Triple-loop regulation (IOUT, IIN, VOUT) | Enables simultaneous current-controlled LED driving with input current limiting and output overvoltage clamping |
| Spread-spectrum frequency modulation | Reduces peak EMI by ±1% to ±31% of fSW, easing compliance with CISPR 25 Class 5 in automotive systems |
| AEC-Q100 Grade H qualification | Validated for –40°C to +150°C operation, supporting under-hood and headlamp applications without derating |
| True-color PWM™ dimming | Maintains consistent LED chromaticity across 4000:1 intensity range via precise timing and zero-current switching |
Applications
| Automotive Headlamps | Avionic Display Backlighting |
|---|---|
Use Scenario: High-intensity LED arrays in adaptive front-lighting systems (AFS) requiring dynamic beam shaping and thermal stability. IC Role / Device Role / Timing Role: Constant-current LED driver with open/short fault detection, PMOS load disconnect, and 150°C junction operation. Use Value: Enables fail-safe illumination with OPENLED/SHORTLED flags and thermal shutdown, meeting ISO 16750-4 pulse test requirements. | Use Scenario: Wide-temperature TFT-LCD backlights in cockpit displays exposed to –55°C to +70°C ambient. IC Role / Device Role / Timing Role: 4000:1 PWM dimming controller with spread-spectrum EMI reduction for EMC-sensitive avionics zones. Use Value: Preserves color accuracy and eliminates visible PWM flicker while passing DO-160 Section 20 radiated emissions limits. |
| Industrial High-Bay Lighting | Medical Surgical Lighting |
Use Scenario: 100W+ LED fixtures in warehouses with 0–10V analog dimming interface and surge immunity. IC Role / Device Role / Timing Role: Input current-limited boost converter with programmable UVLO/OVLO and 42V max input for PoE-powered systems. Use Value: Prevents inrush damage during hot-plug events and maintains stable output despite wide input variation (e.g., 12–42V DC). | Use Scenario: Sterile-field LED light engines requiring flicker-free, high-CRI illumination with real-time fault reporting. IC Role / Device Role / Timing Role: Dual-loop (ILED/VOUT) regulator with soft-start and hiccup-mode recovery for zero-downtime operation. Use Value: Ensures uninterrupted illumination during transient faults via automatic retry and status flagging to host MCU. |
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 –40°C to +125°C junction; no AEC-Q100 qualification | Suitable for industrial/commercial lighting where extended temperature is not required | Select when cost sensitivity outweighs automotive qualification needs and thermal margin is sufficient |
| LM3409HVMM/NOPB | 40V max switch voltage, no integrated spread spectrum, no OPENLED/SHORTLED flags, non-AEC-Q100 | Limited to lower-voltage LED strings; lacks fault-flag diagnostics and automotive reliability testing | Choose only for cost-constrained, non-automotive designs with ≤40V output and minimal fault monitoring |
Compared with LT3952EFE#TRPBF and LM3409HVMM/NOPB, the LT3952AHFE#TRPBF uniquely delivers AEC-Q100 Grade H qualification, 60V capability, and integrated diagnostic flags-making it the sole option for safety-critical automotive lighting where thermal resilience and autonomous fault signaling are mandatory.
Availability
LT3952AHFE#TRPBF is available at Aetrix Electronics and suitable for automotive headlamps, avionic display backlighting, and industrial high-bay lighting requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for LT3952AHFE#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 LT3952A product line was designed specifically for high-reliability, high-power LED driving in thermally demanding environments-emphasizing integrated protection, multi-loop regulation, and automotive-grade robustness.
FAQ
What is the maximum junction temperature rating for the LT3952AHFE#TRPBF?
The LT3952AHFE#TRPBF is guaranteed to operate over a junction temperature range of –40°C to +150°C and is AEC-Q100 Grade H qualified. This rating enables direct use in under-hood automotive applications without thermal derating, unlike the LT3952EFE#TRPBF (125°C max) or LT3952IFE#TRPBF (125°C). The LT3952AHFE#TRPBF's thermal performance is validated with θJA = 30°C/W on standard 2-layer PCBs.
Does the LT3952AHFE#TRPBF support both analog and PWM dimming simultaneously?
Yes, the LT3952AHFE#TRPBF supports combined analog-PWM dimming using the CTRL pin. When CTRL voltage is below 100mV, it functions as an auxiliary PWM input-allowing single-pin control of both dimming methods. This enables hybrid dimming schemes that leverage analog control for coarse adjustment and PWM for fine resolution, preserving color consistency in high-end display backlighting applications using the LT3952AHFE#TRPBF.
How does the LT3952AHFE#TRPBF handle open-LED and short-circuit faults?
The LT3952AHFE#TRPBF detects open-LED faults when FB voltage rises within 45mV of its 1.2V regulation threshold while output current drops below 10% of full scale-asserting OPENLED (Pin 22). Short-circuit faults trigger when VISP–ISN exceeds 375mV, pulling SHORTLED (Pin 21) low. Both flags are open-drain, updated only when PWM = high, and fully supported in the LT3952AHFE#TRPBF's AEC-Q100 validation.
Can the LT3952AHFE#TRPBF drive LEDs in buck-boost or SEPIC configurations?
No-the LT3952AHFE#TRPBF is a dedicated step-up (boost) controller with an internal NMOS switch optimized for boost topology. Its block diagram, pin functions (e.g., SW as drain node, TG as PMOS gate driver), and absolute maximum ratings (SW, ISP, ISN rated to 60V) confirm it is not designed for buck, buck-boost, or SEPIC operation. For non-boost LED topologies, Analog Devices recommends alternatives such as the LT3761 or LT3797-not the LT3952AHFE#TRPBF.
What external components are required for basic operation of the LT3952AHFE#TRPBF?
Minimum external components for functional LT3952AHFE#TRPBF operation include: input capacitor (≥10µF ceramic), output capacitor (≥4.7µF), power inductor (e.g., 10µH), current sense resistor (for ISP/ISN), RT resistor (to set switching frequency), soft-start capacitor (on SS pin), and INTVCC bypass capacitor (≥2.2µF). Optional components include DIM capacitor for internal PWM generation and IVINP/IVINN sense resistor for input current limiting.
LT3952AHFE#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 ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3952AHFE#TRPBF FAQ
1.How can I place an order for LT3952AHFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3952AHFE#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 LT3952AHFE#TRPBF reliable?
The price and inventory of LT3952AHFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3952AHFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3952AHFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3952AHFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3952AHFE#TRPBF?
LT3952AHFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3952AHFE#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 LT3952AHFE#TRPBF?
For technical support, including LT3952AHFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3952AHFE#TRPBF requirements.
6.How does Aetrix verify that LT3952AHFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3952AHFE#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 LT3952AHFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3952AHFE#TRPBF?
All LT3952AHFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3952AHFE#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 LT3952AHFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3952AHFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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