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Analog Devices Inc. LT3795HFE#TRPBF
- Part No.:
- LT3795HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3795HFE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,142
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Product details
Overview
LT3795HFE#TRPBF from Analog Devices is a high-voltage, constant-current/constant-voltage DC/DC LED controller with integrated 7.7V gate driver for external N-channel MOSFETs and PMOS switch control. It supports 4.5V–110V input, delivers up to 110V LED output, enables 3000:1 PWM dimming, and features spread spectrum frequency modulation (SSFM) for EMC compliance in automotive lighting and industrial LED drivers.
For engineers reviewing the LT3795HFE#TRPBF datasheet, LT3795HFE#TRPBF pinout, LT3795HFE#TRPBF application, or LT3795HFE#TRPBF equivalent, key selection considerations include its AEC-Q100 qualification, ±3% constant-current regulation across 0–110V output, programmable input current limit, open/short LED fault flags, and 28-lead TSSOP package with exposed thermal pad rated for –40°C to 150°C junction temperature.
Technical Context
The LT3795HFE#TRPBF implements fixed-frequency current-mode control with rail-to-rail ISP/ISN common-mode range (0–110V), internal 7.7V INTVCC LDO, and dual-loop capability: current sense via ISP/ISN (250mV full-scale threshold) and voltage feedback via FB (1.25V reference). Its architecture integrates SSFM, soft-start with fault restart timer, C/10 battery charge detection, and separate input current sensing (IVINP/IVINN).
It drives low-side NMOS via GATE (INTVCC/GND swing) and high-side PMOS via TG (inverted, level-shifted PWM with 7V clamp), enabling output disconnect. Protection includes open LED (OPENLED flag), short LED (SHORTLED flag), input overvoltage (OVLO), undervoltage lockout (EN/UVLO), thermal shutdown, and SENSE pin current limiting (117mV typ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 110V - supports wide-range industrial and automotive battery inputs including 48V, 60V, and transient-tolerant 110V systems. |
| Output Voltage Capability | Up to 110V - enables direct drive of high-voltage LED strings without cascaded stages. |
| Constant Current Accuracy | ±3% over 0V ≤ VOUT ≤ 110V - ensures stable LED brightness across full output voltage range. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT resistor; higher frequencies reduce inductor size, lower frequencies improve efficiency at high power. |
| Junction Temperature Range | –40°C to +150°C - H-grade qualification enables under-hood automotive use and high-ambient industrial environments. |
| PWM Dimming Ratio | 3000:1 - supports high-fidelity True Color PWM™ dimming for premium lighting applications without color shift. |
| Spread Spectrum FM | Enabled via RAMP pin - reduces peak EMI by spreading switching frequency up to 70% of nominal value. |
Pinout & Package
LT3795HFE#TRPBF is housed in a 28-lead plastic TSSOP package (FE) with exposed thermal pad (Pin 29 = GND), optimized for thermal dissipation in high-power LED driver designs. The package measures 4.4mm × 9.7mm × 1.1mm and requires soldering of the exposed pad to PCB ground plane for reliable thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISP / ISN (Pins 1, 2) | LED current sense differential inputs | Measure voltage across external RLED; support 0–110V common-mode range and enable ±3% current regulation. |
| TG (Pin 3) | PMOS top-gate driver output | Inverts and level-shifts PWM signal to drive series PMOS for output disconnect; clamped to VISP – 7V for gate protection. |
| GATE (Pin 19) | NMOS low-side gate driver output | Drives external N-channel MOSFET between INTVCC and GND; supports high peak currents with 20ns rise/fall times. |
| FB (Pin 7) | Voltage feedback input | Sets constant-voltage mode (1.25V target); also triggers OPENLED fault when VFB > 1.20V and ILED ≈ 0. |
| CTRL1 / CTRL2 (Pins 9, 6) | Analog dimming threshold controls | Linearly adjust LED current sense threshold from 25mV to 250mV; lowest applied voltage determines final setpoint. |
| SS (Pin 11) | Soft-start and fault timer | Charged by 28µA source; discharge below 0.2V required to restart after fault (e.g., overcurrent, UVLO, thermal). |
| RT (Pin 12) | Frequency programming input | Resistor to GND sets switching frequency from 100kHz to 1MHz per datasheet curve; no pull-up/down required. |
| OPENLED / SHORTLED (Pins 16, 15) | Open-collector fault flags | Assert low during detected open-circuit (OPENLED) or short-circuit (SHORTLED) conditions; require external pull-up resistors. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 7.7V INTVCC regulator | Provides stable gate drive supply independent of VIN; supports up to 85mA load and maintains regulation down to VIN = 4.5V. |
| Programmable input current limit | Set via IVINP/IVINN sense resistor; threshold fixed at 60mV, enabling precise input power management in battery-fed systems. |
| AEC-Q100 qualified (H-grade) | Validated for automotive applications across –40°C to +150°C junction temperature; includes reliability testing per stress test conditions. |
| Dual analog dimming control (CTRL1/CTRL2) | Enables flexible current scaling: linear adjustment from 10% to 100% of full-scale current using external voltage sources or DACs. |
| C/10 battery charge detection | Uses ISP/ISN amplifier and comparator to detect end-of-charge condition in LED-based battery chargers with 25mV threshold. |
Applications
| Automotive Headlamp Driver | Industrial High-Voltage LED Lighting |
|---|---|
Use Scenario: Driving 72V LED arrays in adaptive front-lighting systems (AFS) with dynamic beam shaping and diagnostics. IC Role / Device Role / Timing Role: Constant-current controller with open/short LED fault reporting, PWM dimming, and thermal derating for safety-critical illumination. Use Value: Enables AEC-Q100-compliant design with 3000:1 dimming, real-time fault flagging (OPENLED/SHORTLED), and SSFM for CISPR 25 Class 5 EMC compliance. | Use Scenario: Powering 110V industrial LED fixtures in factory high-bay lighting where input varies from 24V DC to 110V DC backup supplies. IC Role / Device Role / Timing Role: High-input-voltage buck-boost or SEPIC controller regulating constant current into long LED strings. Use Value: Supports single-controller solution across wide input range; ±3% current accuracy ensures consistent lumen output despite line variation. |
| Battery-Powered LED Charger | High-Reliability Outdoor Signage |
Use Scenario: Charging 48V Li-ion battery packs while simultaneously powering status LEDs with precise current control. IC Role / Device Role / Timing Role: Dual-function controller performing C/10 termination detection and regulated LED current sourcing. Use Value: Integrates battery charge monitoring (via C/10 comparator) and LED indication in one IC, reducing BOM count and PCB area. | Use Scenario: Outdoor digital signage operating in uncontrolled ambient temperatures from –40°C to +85°C with 100,000-hour lifetime requirement. IC Role / Device Role / Timing Role: Robust LED driver with extended temperature grade (–40°C to +150°C JT) and spread-spectrum EMI reduction. Use Value: Eliminates need for external thermal derating circuits; SSFM lowers conducted/radiated emissions without added filters. |
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; lacks input current sensing; only 60V max VIN. | Targeted at lower-voltage, cost-sensitive LED drivers without automotive qualification or wide-input needs. | Select when input stays ≤60V and SSFM/automotive grade are unnecessary; not suitable for 110V transients or AEC-Q100 programs. |
| LM3410XSDX/NOPB | Single-ended boost-only topology; 32V max VIN; no PMOS disconnect; no OPENLED/SHORTLED flags. | Designed for compact, low-power portable LED applications (<5W), not high-voltage industrial or automotive systems. | Choose for space-constrained, non-automotive designs requiring minimal external components; cannot replace LT3795HFE#TRPBF in high-reliability or high-voltage roles. |
Compared with LTC3783EFE#TRPBF and LM3410XSDX/NOPB, the LT3795HFE#TRPBF uniquely combines 110V input tolerance, AEC-Q100 H-grade operation, integrated PMOS disconnect, and dual fault-flag reporting-making it the only option qualified for under-hood automotive LED drivers requiring robust diagnostics and EMC performance.
Availability
LT3795HFE#TRPBF is available at Aetrix Electronics and suitable for automotive headlamp systems, industrial high-voltage LED lighting, battery-powered LED chargers, and outdoor signage requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3795HFE#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 LT3795 product line was designed specifically for high-reliability, high-voltage LED driver applications demanding precision current regulation, comprehensive fault protection, and automotive-grade ruggedness-enabling next-generation intelligent lighting systems.
FAQ
What is the maximum input voltage rating for the LT3795HFE#TRPBF?
The LT3795HFE#TRPBF has an absolute maximum input voltage (VIN) rating of 110V, as specified in the Absolute Maximum Ratings table. This allows it to withstand automotive load-dump transients and operate reliably in 48V and 60V industrial systems. Operation above 110V risks permanent damage; proper input clamping or filtering must be implemented in designs approaching this limit. The LT3795HFE#TRPBF maintains functional regulation from 4.5V to 110V.
Does the LT3795HFE#TRPBF support both constant-current and constant-voltage modes?
Yes, the LT3795HFE#TRPBF supports both modes. Constant-current regulation is achieved via the ISP/ISN differential inputs with ±3% accuracy across 0–110V output. Constant-voltage mode uses the FB pin referenced to 1.25V with ±2% regulation accuracy. The device automatically selects the active loop based on feedback configuration-no mode-select pin is required. The LT3795HFE#TRPBF can also combine both loops for hybrid regulation schemes.
How does the LT3795HFE#TRPBF implement spread spectrum frequency modulation (SSFM)?
The LT3795HFE#TRPBF implements SSFM through the RAMP pin (Pin 13), which modulates the oscillator frequency by injecting a triangular waveform. With a 12µA current source charging/discharging an external capacitor, the modulation depth reaches up to 70% of the nominal frequency set by the RT resistor. This reduces EMI peaks without requiring external clock synchronization. The LT3795HFE#TRPBF's SSFM is fully integrated-no additional ICs or complex layout is needed.
What is the purpose of the TG pin on the LT3795HFE#TRPBF?
The TG (Top Gate) pin on the LT3795HFE#TRPBF provides an inverted, level-shifted PWM signal to drive the gate of an external high-side PMOS transistor. It operates between VISP and VISP – 7V, with internal clamping to protect the PMOS gate oxide. This enables safe output disconnect during fault conditions or standby. When unused, TG must be left floating-not tied to GND or VISP. The LT3795HFE#TRPBF's TG functionality is essential for fail-safe LED string isolation.
Is the LT3795HFE#TRPBF qualified for automotive applications?
Yes, the LT3795HFE#TRPBF is AEC-Q100 qualified for automotive applications. Its H-grade temperature rating (–40°C to +150°C junction) and qualification testing-including HTOL, TC, UHAST, and ESD-meet automotive reliability requirements. The part marking "HFE" explicitly denotes the automotive-qualified variant. Unlike E- or I-grade versions, the LT3795HFE#TRPBF is approved for under-hood and headlamp use where thermal and vibration stresses are severe.
LT3795HFE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3795HFE#TRPBF FAQ
1.How can I place an order for LT3795HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3795HFE#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 LT3795HFE#TRPBF reliable?
The price and inventory of LT3795HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3795HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3795HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3795HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3795HFE#TRPBF?
LT3795HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3795HFE#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 LT3795HFE#TRPBF?
For technical support, including LT3795HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3795HFE#TRPBF requirements.
6.How does Aetrix verify that LT3795HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3795HFE#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 LT3795HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3795HFE#TRPBF?
All LT3795HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3795HFE#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 LT3795HFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3795HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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