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Analog Devices Inc. LT3795IFE#TRPBF
- Part No.:
- LT3795IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3795IFE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT3795IFE#TRPBF from Analog Devices is a 110V 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. Its 28-lead TSSOP package supports AEC-Q100 Grade I (–40°C to 125°C) operation.
For engineers reviewing the LT3795IFE#TRPBF datasheet, LT3795IFE#TRPBF pinout, LT3795IFE#TRPBF application, or LT3795IFE#TRPBF equivalent, key selection considerations include input voltage range (4.5V–110V), programmable input current limit, open/short LED fault detection, SSFM-enabled EMC compliance, and dual analog dimming via CTRL1/CTRL2 pins.
Technical Context
The LT3795IFE#TRPBF implements fixed-frequency current-mode control with internal 7.7V INTVCC regulator, enabling direct drive of low-side N-channel MOSFETs and inversion-level-shifting for external PMOS switches. Its dual-sense architecture independently monitors LED current (via ISP/ISN) and input current (via IVINP/IVINN), each with rail-to-rail common-mode range (0V–110V) and dedicated amplifiers.
Spread spectrum modulation on the RAMP pin reduces EMI peaks by spreading oscillator frequency up to 70%, while soft-start and fault restart timing are controlled by the SS pin's 28µA pull-up and 2.8µA pull-down currents. The FB pin serves dual roles: voltage regulation reference (1.25V nominal) and open-LED protection trigger (FB > 1.20V with V(ISP−ISN) < 25mV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 110V - supports wide-range industrial and automotive battery inputs, including cold-crank and load-dump transients. |
| Constant Current Accuracy | ±3% over 0V ≤ VOUT ≤ 110V - ensures stable LED brightness across full output voltage swing without recalibration. |
| PWM Dimming Ratio | 3000:1 - enables precise color-matched dimming in architectural and automotive exterior lighting. |
| Switching Frequency Range | 100kHz to 1MHz (programmable via RT resistor) - allows optimization of efficiency vs. size for high-power LED drivers. |
| Operating Temperature | –40°C to +125°C (Grade I) - qualified per AEC-Q100 for under-hood and headlamp applications. |
| LED Protection Features | Open LED (OPENLED flag), short LED (SHORTLED flag), and programmable undervoltage lockout - provides fail-safe monitoring without external circuitry. |
| Input Current Limit | Programmable via IVINP/IVINN sense resistor - enables precise input power capping for thermal management in enclosed fixtures. |
Pinout & Package
LT3795IFE#TRPBF is housed in a 28-lead plastic TSSOP package (FE) with exposed pad (Pin 29) soldered to PCB ground for thermal and electrical integrity. Pin pitch is 0.65mm; package dimensions are 9.7mm × 4.4mm × 1.1mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISP / ISN (Pins 1, 2) | LED current sense differential inputs | Measure voltage across external RLED; support 0V–110V common-mode range for high-side or floating LED string configurations. |
| TG (Pin 3) | Inverted, level-shifted PWM output | Drives gate of series PMOS disconnect switch between ISP and (ISP – 7V); includes internal 7V clamp for gate protection. |
| FB (Pin 7) | Voltage feedback / open-LED detection | Regulates output voltage to 1.25V nominal; asserts OPENLED when FB > 1.20V and V(ISP−ISN) < 25mV (typical). |
| CTRL1 / CTRL2 (Pins 6, 9) | Analog dimming threshold adjustment | Set LED current threshold from 16mV to 257mV; lowest applied voltage determines final regulation point. |
| SS (Pin 11) | Soft-start and fault timer | 28µA pull-up initiates startup; 2.8µA pull-down activates on fault (overcurrent, UVLO, short LED) - requires external capacitor for timing. |
| RT (Pin 12) | Frequency programming | Resistor to GND sets switching frequency from 100kHz to 1MHz; enables EMI optimization and inductor size reduction. |
| GATE (Pin 19) | N-channel MOSFET driver output | Swings between INTVCC (7.7V) and GND; drives low-side switch with 20ns rise/fall times into 3300pF load. |
| INTVCC (Pin 20) | Internal regulated supply | 7.7V LDO output powers internal logic and gate driver; requires ≥4.7µF local bypass for stability. |
| EN/UVLO (Pin 24) | Enable and input undervoltage lockout | 1.22V falling threshold with user-programmable hysteresis; sub-µA bias current above threshold minimizes quiescent loss. |
| OVLO (Pin 25) | Input overvoltage lockout | 1.25V rising threshold detects input surges; prevents operation during load-dump events above safe limits. |
| IVINP / IVINN (Pins 27, 26) | Input current sense differential inputs | Monitor input current with 60mV threshold; enable precise input power limiting independent of LED load conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Spread Spectrum Frequency Modulation (SSFM) | Reduces peak EMI by spreading oscillator bandwidth up to 70%, easing CISPR-25 Class 5 compliance in automotive lighting. |
| Dual Independent Current Sensing | Separate ISP/ISN (LED current) and IVINP/IVINN (input current) paths enable simultaneous load regulation and input power capping - critical for thermal-limited enclosures. |
| PMOS Top-Gate Driver (TG) | Provides active output disconnect for safety-critical applications (e.g., emergency lighting), eliminating need for external high-voltage PMOS drivers. |
| True-Color PWM Dimming | 3000:1 ratio preserves LED chromaticity across dimming range - essential for RGB and tunable-white systems where color shift must be minimized. |
| AEC-Q100 Qualified (Grade I) | Validated for automotive use at –40°C to +125°C junction temperature, including HTOL, TC, and ESD testing per stress test plan. |
| Integrated Fault Reporting | Open-collector OPENLED and SHORTLED flags provide immediate system-level fault indication without microcontroller polling. |
Applications
| Automotive Headlamps | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Driving 48V–80V LED strings in adaptive driving beam (ADB) modules with dynamic zone control. IC Role / Device Role / Timing Role: Constant-current controller with PWM dimming interface and real-time open/short LED fault reporting. Use Value: Enables AEC-Q100-compliant, thermally robust LED driver design with no external current sense amplifier or fault logic required. |
Use Scenario: Powering 100W+ high-voltage LED arrays in warehouse and factory ceiling fixtures with 0–10V or DALI dimming integration. IC Role / Device Role / Timing Role: Primary DC/DC controller regulating both LED current and input power, with SSFM for conducted EMI suppression. Use Value: Eliminates need for separate input current limiter IC and reduces BOM count by integrating PMOS gate driver and fault flags. |
| Battery-Powered Emergency Lighting | UV-C Disinfection Systems |
Use Scenario: Driving high-intensity LED strings from 12V–48V lead-acid or LiFePO4 batteries with C/10 charge termination detection. IC Role / Device Role / Timing Role: Dual-mode controller supporting LED drive and battery charging supervision via C/10 comparator. Use Value: Single-chip solution replaces discrete charge controller + LED driver, reducing footprint and enabling automatic transition from charge to illumination mode. |
Use Scenario: Controlling high-voltage UV-C LED arrays (70–110V) requiring precise current regulation and rapid fault shutdown for safety. IC Role / Device Role / Timing Role: High-voltage constant-current source with <300ns fault response (FB > 1.3V triggers immediate GATE/TG shutdown). Use Value: Meets IEC 62471 photobiological safety requirements through hardware-enforced overvoltage/overcurrent cutoff - no firmware dependency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EFE#TRPBF | Fixed 200kHz frequency; no SSFM; no PMOS TG driver; only single current sense (ISENSE); max VIN = 40V | Suitable for lower-voltage (<40V), non-automotive LED drivers where EMI is less constrained and output disconnect is not required | Select when cost sensitivity outweighs EMI performance and high-voltage capability; verify thermal derating below 125°C ambient. |
| LM3414MHX/NOPB | Max VIN = 42V; no input current sensing; no SSFM; no OPENLED/SHORTLED flags; no AEC-Q100 qualification | Targeted at commercial indoor lighting with simpler fault handling and lower input voltage requirements | Choose for cost-optimized, non-automotive designs where 110V transient immunity and dual-sense capability are unnecessary. |
Compared with LTC3783EFE#TRPBF and LM3414MHX/NOPB, the LT3795IFE#TRPBF uniquely delivers 110V input tolerance, integrated SSFM, dual current sensing, and AEC-Q100 qualification - making it the only option for automotive-grade, high-voltage, EMI-sensitive LED systems requiring hardware-level safety monitoring.
Availability
LT3795IFE#TRPBF is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-bay lighting, and UV-C disinfection systems requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant traceability.
Supply support for LT3795IFE#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 LT3795IFE#TRPBF belongs to Analog Devices' Power by Linear™ LED controller family, engineered specifically for high-reliability, high-voltage LED lighting in automotive and harsh-environment applications where precision regulation, fault resilience, and EMI control are mandatory.
FAQ
What is the maximum input voltage rating for the LT3795IFE#TRPBF?
The LT3795IFE#TRPBF has an absolute maximum input voltage rating of 110V on the VIN pin, and its EN/UVLO, ISP, ISN, IVINP, and IVINN pins also tolerate up to 110V. This enables direct connection to 48V, 60V, and 72V industrial bus systems and withstands automotive load-dump transients without external clamping.
Does the LT3795IFE#TRPBF support both constant-current and constant-voltage operation?
Yes, the LT3795IFE#TRPBF supports dual-mode regulation: constant-current mode via ISP/ISN feedback for LED strings, and constant-voltage mode via FB pin feedback for general-purpose DC/DC conversion. In CV mode, it achieves ±2% regulation accuracy and uses the same 1.25V internal reference.
How does the LT3795IFE#TRPBF implement spread spectrum frequency modulation?
The LT3795IFE#TRPBF applies spread spectrum frequency modulation (SSFM) via the RAMP pin, which modulates the oscillator frequency by up to 70% around the nominal value set by the RT resistor. The modulation frequency is determined by 12µA/(2 × 1V × CRAMP), allowing EMI peak reduction without altering loop compensation.
What is the purpose of the TG pin on the LT3795IFE#TRPBF?
The TG pin on the LT3795IFE#TRPBF is a top-gate driver that inverts and level-shifts the PWM signal to drive the gate of an external series PMOS transistor. It operates between ISP and (ISP – 7V), includes internal 7V gate-clamp protection, and enables safe output disconnect for fail-safe LED systems.
Is the LT3795IFE#TRPBF qualified for automotive applications?
Yes, the LT3795IFE#TRPBF is AEC-Q100 qualified for Grade I (–40°C to +125°C), with full reliability testing including HTOL, temperature cycling, and ESD per automotive stress test standards. Its FE package and internal protections make it suitable for headlamp, fog lamp, and interior lighting modules.
LT3795IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT3795IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3795IFE#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 LT3795IFE#TRPBF reliable?
The price and inventory of LT3795IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3795IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3795IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3795IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3795IFE#TRPBF?
LT3795IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3795IFE#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 LT3795IFE#TRPBF?
For technical support, including LT3795IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3795IFE#TRPBF requirements.
6.How does Aetrix verify that LT3795IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3795IFE#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 LT3795IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3795IFE#TRPBF?
All LT3795IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3795IFE#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 LT3795IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3795IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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