My Inquiry
My Account
Analog Devices Inc. LT3795EFE#TRPBF
- Part No.:
- LT3795EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3795EFE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,700
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3795EFE#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 boost, buck-boost, or SEPIC topologies. It features ±3% constant current regulation over 0–110V output, 3000:1 true-color PWM dimming, and programmable input current limiting. It is widely used in automotive exterior lighting and industrial high-brightness LED systems.
For engineers reviewing the LT3795EFE#TRPBF datasheet, LT3795EFE#TRPBF pinout, LT3795EFE#TRPBF application, or LT3795EFE#TRPBF equivalent, key selection considerations include its 28-lead TSSOP package, AEC-Q100 qualification for automotive use, 4.5V–110V input range, integrated PMOS gate driver (TG), and dual analog dimming via CTRL1/CTRL2 pins.
Technical Context
The LT3795EFE#TRPBF implements fixed-frequency current-mode control with internal 7.7V INTVCC regulator, rail-to-rail ISP/ISN common-mode range (0–110V), and independent input current sensing (IVINP/IVINN). Its error amplifier (VC) regulates either LED current (via ISP–ISN) or output voltage (via FB), with seamless mode switching based on feedback configuration.
Spread spectrum modulation (SSFM) is applied via the RAMP pin to reduce EMI peaks; soft-start and fault restart are managed by the SS pin using programmable capacitor timing. The TG pin provides inverted, level-shifted PWM to drive an external high-side PMOS for LED disconnect, while GATE drives a low-side N-channel MOSFET.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 110V - supports wide-range industrial and automotive battery inputs including 12V, 24V, 48V, and transient-tolerant 87V LED string operation. |
| Constant Current Accuracy | ±3% over 0V ≤ VOUT ≤ 110V - ensures stable LED brightness across full output voltage swing without recalibration. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT resistor; enables optimization of efficiency vs. size trade-offs in high-power LED drivers. |
| PWM Dimming Ratio | 3000:1 - enables precise color-matched dimming in architectural and automotive lighting without visible flicker or color shift. |
| Package & Temp Range | 28-Lead TSSOP, –40°C to +125°C - qualified per AEC-Q100 Grade E; suitable for under-hood and outdoor lighting environments. |
| Integrated Protection | Open LED (OPENLED flag), short-circuit (SHORTLED flag), input overvoltage (OVLO), thermal shutdown - reduces external component count and improves system reliability. |
| Current Sense Inputs | ISP/ISN (0–110V CMR) and IVINP/IVINN (2.5–110V CMR) - enables accurate LED current regulation and independent input current limiting in single-controller designs. |
Pinout & Package
LT3795EFE#TRPBF is housed in a 28-lead plastic TSSOP (FE package) with exposed pad (Pin 29 = GND), requiring soldering to PCB ground plane for thermal and electrical performance. Pin pitch is 0.65mm; body dimensions are 9.7mm × 4.4mm × 1.1mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISP / ISN (Pins 1, 2) | LED current sense differential inputs | Ground-referred inputs supporting 0–110V common-mode range; set LED current via external RLED; enable open-LED detection when V(ISP–ISN) < 25mV. |
| TG (Pin 3) | High-side PMOS gate driver output | Inverts and level-shifts PWM signal to drive series PMOS between ISP and (ISP – 7V); includes internal 7V clamp for gate protection. |
| GATE (Pin 19) | Low-side N-MOSFET gate driver | Drives external N-channel switch between INTVCC and GND; supports up to 1MHz switching with 20ns rise time (CL = 3300pF). |
| FB (Pin 7) | Voltage feedback input | Sets constant-voltage regulation point at 1.25V nominal; also triggers OPENLED/SHORTLED flags and overvoltage shutdown (FB > 1.3V). |
| CTRL1 / CTRL2 (Pins 6, 9) | Analog dimming threshold controls | Linearly scale LED current sense threshold from 16mV to 250mV; lowest voltage dominates; enables temperature compensation or multi-channel current matching. |
| SS (Pin 11) | Soft-start & fault timer | 28µA pull-up to 2.5V sets soft-start time; switches to 2.8µA pull-down during faults (overcurrent, UVLO, thermal, short); requires external capacitor for timing. |
Key Features
| Feature | Design Value |
|---|---|
| Spread Spectrum Frequency Modulation (SSFM) | Reduces EMI peak emissions by spreading oscillator frequency up to 70% of nominal value; configured via RAMP pin with external capacitor. |
| Programmable Input Current Limit | Set precisely via IVINP/IVINN sense resistor; threshold fixed at 60mV; reported at IVINCOMP with 20× gain for monitoring or loop control. |
| Dual Analog Dimming Interface | CTRL1 and CTRL2 accept 0–2V analog signals; independently scalable current thresholds enable synchronized multi-string dimming or thermal derating. |
| PMOS High-Side Disconnect Driver | TG pin provides robust gate drive for series PMOS switch; enables safe LED string disconnection during PWM off-time or fault conditions. |
| AEC-Q100 Qualified Operation | Guaranteed performance over –40°C to +125°C junction temperature; validated for automotive exterior lighting, headlamps, and DRL applications. |
Applications
| Automotive Headlamp Driver | Industrial High-Voltage LED String |
|---|---|
Use Scenario: Driving 87V, 400mA LED arrays in adaptive front-lighting systems (AFS) with dynamic beam shaping. IC Role / Device Role / Timing Role: Constant-current controller regulating LED string current while managing thermal foldback and EMI-compliant switching via SSFM. Use Value: Enables 3000:1 PWM dimming without color shift, meets CISPR-25 Class 5 radiated emissions limits, and supports ASIL-B functional safety architecture via OPENLED/SHORTLED fault flags. | Use Scenario: Powering 110V industrial signage LEDs from 48V DC bus with input surge tolerance up to 110V transient. IC Role / Device Role / Timing Role: Boost-mode LED controller with programmable input current limit and OVLO protection to prevent damage during line surges. Use Value: Eliminates need for external input TVS or current-limiting FET; maintains ±3% current accuracy across full 0–110V output range, reducing binning requirements. |
| Battery-Powered LED Floodlight | UV-C Disinfection Module |
Use Scenario: 12V–24V battery-operated portable floodlights requiring long runtime and thermal management. IC Role / Device Role / Timing Role: Buck-boost LED controller with C/10 battery charging detection and analog dimming via CTRL pins. Use Value: Integrates battery charge termination (C/10 comparator) and LED dimming in one IC; reduces BOM count by eliminating separate charger IC and dimming DAC. | Use Scenario: Driving high-voltage UV-C LED strings (e.g., 60–80V, 350mA) in medical-grade disinfection devices with strict safety interlocks. IC Role / Device Role / Timing Role: Constant-current controller with fast short-circuit response (<1µs) and isolated fault reporting via SHORTLED/OPENLED open-collector outputs. Use Value: Provides sub-100µs fault detection and latch-off behavior; enables fail-safe shutdown via external logic when UV-C output must be disabled immediately upon sensor fault. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EFE#TRPBF | 4-switch synchronous buck-boost controller; no integrated LED-specific protections (OPENLED/SHORTLED); no SSFM; wider VIN (4–36V) but lower max VOUT (~30V). | Best suited for non-LED power conversion (e.g., battery backup, 12V–24V rail regulation); lacks LED current sense architecture and dimming interfaces. | Select only if topology requires synchronous 4-switch operation and LED-specific features are unnecessary. |
| LM3410XMF/NOPB | Single-stage boost LED driver; fixed 1.6MHz frequency; max 40V output; no input current sensing; no AEC-Q100 qualification. | Targeted at low-power portable LED lighting (≤1A, ≤40V); lacks high-voltage capability, automotive qualification, and dual dimming control. | Choose for cost-sensitive, space-constrained consumer lighting where 110V operation and automotive compliance are not required. |
Compared with LTC3789EFE#TRPBF and LM3410XMF/NOPB, the LT3795EFE#TRPBF uniquely combines 110V LED string support, AEC-Q100 qualification, integrated open/short LED diagnostics, and dual analog dimming-making it the only option for high-reliability, high-voltage automotive and industrial LED systems.
Availability
LT3795EFE#TRPBF is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-voltage signage, and UV-C disinfection modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT3795EFE#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 LT3795EFE#TRPBF belongs to Analog Devices' Power by Linear™ LED controller family, engineered specifically for high-voltage, high-reliability LED lighting in automotive and industrial environments where precision current regulation, EMI control, and functional safety are critical.
FAQ
What is the maximum output voltage supported by the LT3795EFE#TRPBF?
The LT3795EFE#TRPBF supports LED string voltages up to 110V in constant-current mode, with ±3% regulation accuracy across the full 0–110V range. Its ISP/ISN inputs tolerate 110V common-mode voltage, enabling direct connection to high-voltage LED arrays without level-shifting circuitry. Transient tolerance exceeds 110V per Absolute Maximum Ratings.
Does the LT3795EFE#TRPBF support both constant-current and constant-voltage regulation?
Yes, the LT3795EFE#TRPBF supports both modes. Constant-current regulation is achieved via ISP/ISN differential sensing with ±3% accuracy; constant-voltage regulation uses the FB pin referenced to 1.25V with ±2% accuracy. The IC automatically adapts based on feedback configuration-no mode-select pin is required.
How does the spread spectrum frequency modulation (SSFM) function in the LT3795EFE#TRPBF?
The LT3795EFE#TRPBF implements SSFM via the RAMP pin, which modulates the oscillator frequency by up to 70% of its nominal value. A 12µA current source charges an external capacitor on RAMP, generating a triangular waveform that dithers the switching frequency. This reduces EMI peak amplitudes, easing compliance with CISPR-25 and EN55022 standards.
What protection features are integrated into the LT3795EFE#TRPBF?
The LT3795EFE#TRPBF integrates open-LED (OPENLED flag), short-circuit (SHORTLED flag), input overvoltage (OVLO), thermal shutdown, and input undervoltage lockout (EN/UVLO). It also features SENSE pin current limiting (113mV threshold), FB overvoltage shutdown (>1.3V), and programmable fault restart via the SS pin.
Is the LT3795EFE#TRPBF pin-compatible with other members of the LT3795 family?
Yes, all LT3795 variants-including LT3795EFE#TRPBF, LT3795IFE#TRPBF, and LT3795HFE#TRPBF-share identical 28-lead TSSOP (FE) pinout and footprint. Differences are limited to operating temperature grade (–40°C to +125°C for E-grade) and internal characterization; no PCB redesign is needed when upgrading within the family.
LT3795EFE#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
LT3795EFE#TRPBF FAQ
1.How can I place an order for LT3795EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3795EFE#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 LT3795EFE#TRPBF reliable?
The price and inventory of LT3795EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3795EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3795EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3795EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3795EFE#TRPBF?
LT3795EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3795EFE#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 LT3795EFE#TRPBF?
For technical support, including LT3795EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3795EFE#TRPBF requirements.
6.How does Aetrix verify that LT3795EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3795EFE#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 LT3795EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3795EFE#TRPBF?
All LT3795EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3795EFE#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 LT3795EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3795EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3795EFE#TRPBF Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
