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Analog Devices Inc. LT3795IFE#PBF
- Part No.:
- LT3795IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3795IFE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,232
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Product details
Overview
LT3795IFE#PBF from Analog Devices is a 110V input, constant-current/constant-voltage DC/DC LED controller with spread spectrum frequency modulation (SSFM), designed to drive high-voltage LED strings in automotive and industrial lighting. It features ±3% constant current regulation up to 110V output, 3000:1 true-color PWM dimming, and integrated PMOS gate driver for output disconnect. It operates across 4.5V–110V input and supports programmable input current limiting.
For engineers reviewing the LT3795IFE#PBF datasheet, LT3795IFE#PBF pinout, LT3795IFE#PBF application, or LT3795IFE#PBF equivalent, key selection considerations include its AEC-Q100 qualification, dual current/voltage regulation mode, SSFM-enabled EMC compliance, 28-lead TSSOP package with exposed thermal pad, and support for both analog (CTRL1/CTRL2) and PWM dimming interfaces.
Technical Context
The LT3795IFE#PBF implements a fixed-frequency, current-mode control architecture with internal 7.7V LDO for gate drive, enabling stable operation across wide VIN (4.5V–110V) and VOUT (0V–110V) ranges. Its dual-sense architecture independently monitors LED current via ISP/ISN (±3% accuracy) and input current via IVINP/IVINN (60mV threshold).
It integrates dedicated protection circuitry including open-LED detection (FB > 1.20V + V(ISP-ISN) < 25mV), short-LED fault (FB < 0.3V), overvoltage lockout (OVLO = 1.25V), and thermal shutdown. The SS pin serves dual purpose as soft-start timer and fault restart latch, while RAMP enables 70% SSFM depth for EMI reduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 110V - supports direct connection to 48V/72V/96V industrial buses and transient-tolerant automotive systems. |
| Constant Current Accuracy | ±3% over 0V ≤ VOUT ≤ 110V - ensures consistent LED brightness across full output voltage swing without recalibration. |
| Dimming Ratio | 3000:1 true-color PWM - preserves color fidelity at ultra-low duty cycles for architectural and display lighting. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT resistor; enables optimization of magnetics size vs. EMI performance. |
| Package | 28-Lead TSSOP with exposed GND pad - provides thermal resistance θJC = 10°C/W for high-power LED driver thermal management. |
| AEC-Q100 Grade | Grade I (–40°C to +125°C) - qualified for under-hood automotive lighting and ADAS illumination subsystems. |
| Spread Spectrum Modulation | 70% frequency deviation - reduces peak EMI by spreading energy across bandwidth, easing CISPR 25 Class 5 compliance. |
Pinout & Package
LT3795IFE#PBF is housed in a 28-lead plastic TSSOP package (FE) with exposed thermal pad (Pin 29 = GND). The package requires soldering the exposed pad directly to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISP / ISN (Pins 1, 2) | LED current sense differential inputs | Measure voltage across external RLED; enable ±3% constant-current regulation and open-LED detection. |
| TG (Pin 3) | Inverted, level-shifted PMOS gate driver | Drives series PMOS switch between ISP and (ISP – 7V); enables safe output disconnect during PWM off-time. |
| FB (Pin 7) | Voltage feedback / open-LED flag input | Sets constant-voltage regulation point at 1.25V; asserts OPENLED when FB > 1.20V and V(ISP-ISN) < 25mV. |
| CTRL1 / CTRL2 (Pins 6, 9) | Analog dimming threshold inputs | Linearly scale LED current sense threshold from 16mV to 250mV; lowest voltage dominates for redundancy. |
| SS (Pin 11) | Soft-start / fault restart timer | 28µA pull-up charges external capacitor; fault conditions enable 2.8µA pull-down to reset soft-start cycle. |
| RT (Pin 12) | Frequency programming node | Resistor-to-GND sets switching frequency from 100kHz to 1MHz per datasheet curve (e.g., 82.5kΩ = 105kHz). |
| RAMP (Pin 13) | Spread spectrum modulation input | 12µA current source charges external capacitor; sets modulation frequency for 70% SSFM depth. |
| PWM (Pin 14) | Digital dimming control | Active-high signal enables switching; internal 500kΩ pull-down allows direct MCU GPIO interface. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PMOS gate driver | Enables safe, low-loss output disconnect without external level-shifting circuitry - critical for fail-safe LED string isolation. |
| Programmable input current limit | Set via RINSNS to clamp IIN at 60mV/RINSNS - protects upstream power sources and enables battery charger current limiting. |
| Open-LED and short-LED fault flags | Separate OPENLED and SHORTLED open-collector outputs with latched status during PWM low - simplifies system-level fault reporting. |
| C/10 battery charging detection | Uses ISP/ISN amplifier to detect battery termination at 0.01C rate via 25mV threshold - supports multi-stage Li-ion and lead-acid charging. |
| Internal 7.7V LDO for gate drive | Regulates INTVCC from VIN; delivers up to 85mA at 110V input - eliminates need for external bias supply in high-input-voltage designs. |
Applications
| Automotive Headlamp Driver | Industrial High-Voltage LED String |
|---|---|
Use Scenario: Driving 40–80V LED arrays in adaptive front-lighting systems (AFS) with dynamic beam shaping. IC Role / Device Role / Timing Role: Constant-current controller with PWM dimming and PMOS disconnect for safety-critical load isolation. Use Value: AEC-Q100 Grade I qualification ensures reliability at 125°C junction temperature; SSFM meets CISPR 25 Class 5 EMI limits. | Use Scenario: Powering 72V industrial LED fixtures in factory automation and outdoor signage. IC Role / Device Role / Timing Role: High-input-voltage buck-boost LED controller supporting 4.5V–110V range and transient tolerance. Use Value: 110V absolute maximum input rating withstands 87V transients; ±3% current accuracy maintains uniform luminance across long strings. |
| Battery-Powered LED Lighting | Accurate Current-Limited Voltage Regulator |
Use Scenario: Portable inspection lights and emergency beacons using 12V/24V lead-acid or LiFePO4 batteries. IC Role / Device Role / Timing Role: Dual-mode controller operating in constant-current (LED drive) or constant-voltage (battery charging) mode. Use Value: C/10 comparator enables automatic charge termination; programmable UVLO prevents deep discharge damage. | Use Scenario: Precision lab power supplies and test equipment requiring stable, current-limited 5V/12V/24V outputs. IC Role / Device Role / Timing Role: Constant-voltage regulator with active current limiting and fast fault response (FB > 1.3V → immediate GATE shutdown). Use Value: ±2% CV regulation and rail-to-rail ISP/ISN common-mode range (0–110V) allow accurate low-dropout operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EFE#PBF | Fixed 200kHz frequency; no SSFM; no PMOS TG driver; supports only constant-current mode. | Lacks output disconnect and EMI-reduction features; limited to lower-voltage LED strings (<60V). | Select when cost sensitivity outweighs EMC requirements and output isolation is unnecessary. |
| LM3410XSD/NOPB | Single-ended boost controller; max 42V input; no input current sensing; no AEC-Q100 qualification. | Not suitable for 72V+ industrial or automotive applications; lacks diagnostic flags and C/10 detection. | Choose only for low-voltage, non-automotive portable LED lighting with minimal feature requirements. |
Compared with LTC3783EFE#PBF and LM3410XSD/NOPB, the LT3795IFE#PBF uniquely combines 110V input capability, AEC-Q100 qualification, integrated PMOS driver, and SSFM - making it the only option for robust, EMI-compliant, fail-safe high-voltage LED systems requiring diagnostics and battery charging support.
Availability
LT3795IFE#PBF is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-voltage LED lighting, battery-powered inspection tools, and precision current-limited power supplies requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT3795IFE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3795 product line was engineered specifically for high-reliability, high-voltage LED driver applications demanding precise current regulation, comprehensive fault protection, and automotive-grade robustness - targeting adaptive lighting, commercial signage, and battery-charging-integrated illumination.
FAQ
What is the maximum input voltage rating for the LT3795IFE#PBF?
The LT3795IFE#PBF has an absolute maximum input voltage rating of 110V on the VIN pin, and also supports 110V on EN/UVLO, ISP, and ISN pins. This enables direct integration into 48V, 72V, and 96V industrial power systems and withstands 87V transients per ISO 7637-2, making the LT3795IFE#PBF suitable for harsh automotive and industrial environments.
Does the LT3795IFE#PBF support both constant-current and constant-voltage regulation modes?
Yes, the LT3795IFE#PBF supports dual regulation modes. Constant-current mode uses ISP/ISN differential sensing with ±3% accuracy across 0V–110V output; constant-voltage mode uses the FB pin regulated to 1.25V with ±2% accuracy. The LT3795IFE#PBF automatically transitions between modes based on feedback configuration - enabling use in LED drivers and battery chargers within the same platform.
How does the spread spectrum frequency modulation (SSFM) function in the LT3795IFE#PBF?
The LT3795IFE#PBF implements SSFM via the RAMP pin, where an internal 12µA current source charges an external capacitor to generate a triangular waveform. This modulates the oscillator frequency by up to 70% of its nominal value, spreading EMI energy across a wider bandwidth. The modulation frequency is set by 12µA/(2 × 1V × CRAMP), and SSFM is enabled by leaving RAMP unconnected or applying the ramp signal - reducing peak radiated emissions to aid CISPR 25 compliance.
What is the role of the TG pin on the LT3795IFE#PBF, and how is it used?
The TG pin on the LT3795IFE#PBF is a top-gate driver that inverts and level-shifts the PWM signal to drive the gate of an external high-side PMOS transistor. When active, it pulls TG to (ISP – 7V) to safely turn on the PMOS for output disconnect; an internal 7V clamp protects the PMOS gate oxide. During PWM low, TG rises to ISP to fully turn off the PMOS - ensuring fail-safe isolation of the LED string, a critical requirement in automotive lighting systems using the LT3795IFE#PBF.
Is the LT3795IFE#PBF qualified for automotive applications, and what grade does it carry?
Yes, the LT3795IFE#PBF is AEC-Q100 qualified for automotive applications and carries Grade I qualification, specifying guaranteed operation from –40°C to +125°C junction temperature. It is explicitly listed in the manufacturer's order information as an automotive-grade part (LT3795IFE#PBF), with controlled manufacturing and reliability testing per automotive standards - making it suitable for under-hood headlamp, DRL, and interior lighting systems.
LT3795IFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- -
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 110V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 100kHz ~ 1MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3795IFE#PBF FAQ
1.How can I place an order for LT3795IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3795IFE#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 LT3795IFE#PBF reliable?
The price and inventory of LT3795IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3795IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3795IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3795IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3795IFE#PBF?
LT3795IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3795IFE#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 LT3795IFE#PBF?
For technical support, including LT3795IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3795IFE#PBF requirements.
6.How does Aetrix verify that LT3795IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3795IFE#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 LT3795IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3795IFE#PBF?
All LT3795IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3795IFE#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 LT3795IFE#PBF part is unused and in its original packaging.
Return procedure for LT3795IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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