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Analog Devices Inc. LT3760IFE#TRPBF
- Part No.:
- LT3760IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3760IFE#TRPBF.pdf
- Description:
- IC LED DRVR CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,368
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Product details
Overview
LT3760IFE#TRPBF from Analog Devices (formerly Linear Technology) is an 8-channel, ±2% current-matched LED driver IC with integrated step-up DC/DC controller, capable of driving up to 45V LED strings at 100mA per channel. It features programmable LED current (20–100mA), 3000:1 True Color PWM dimming, and adaptive VOUT regulation for optimum efficiency in automotive backlighting and industrial display applications.
For engineers reviewing the LT3760IFE#TRPBF datasheet, LT3760IFE#TRPBF pinout, LT3760IFE#TRPBF application, or LT3760IFE#TRPBF equivalent, key selection criteria include channel current matching tolerance, open-LED fault resilience, programmable thermal derating via TSET, and synchronization capability with external clock signals.
Technical Context
The LT3760IFE#TRPBF implements a constant-frequency, current-mode boost topology with dual transconductance error amplifiers-one regulating LED string voltage (ensuring ≥1V at each LEDx pin), the other activating only during all-string open faults to clamp VOUT via OVPSET. Its VC pin controls peak inductor current and integrates soft-start ramping and hiccup-mode overcurrent protection.
Each of the eight LEDx pins functions as an accurate, externally programmable current sink (20–100mA) with ±2% matching across channels at 40mA; channels may be paralleled to support higher total current. The device supports both analog dimming (CTRL pin, 25:1 range) and high-fidelity PWM dimming (3000:1 range, true-color preservation), with independent fault flag assertion on open-LED detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 8 independent current-sink outputs, each programmable 20–100mA |
| Current Matching | ±2% max deviation across all 8 channels at 40mA; typical ±0.7% |
| PWM Dimming Range | 3000:1 ratio with True Color PWM™-preserves color fidelity at low duty cycles |
| Switching Frequency | Programmable 100kHz–1MHz via RT resistor or synchronizable to external clock |
| VOUT Capability | Up to 60V output; adapts dynamically to LED VF for minimum power loss |
| Open-LED Protection | Dedicated FAULT pin asserts low on any open string; OVPSET sets max VOUT if all strings open |
| Thermal Derating | Programmable LED current reduction above user-defined junction temperature (TSET pin) |
Pinout & Package
LT3760IFE#TRPBF is housed in a thermally enhanced 28-pin plastic TSSOP package (FE) with exposed PGND pad (Pin 29) requiring soldering to PCB ground plane for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED1–LED8 (Pins 6–9, 20–23) | Constant-current sink outputs | Each drives one LED string cathode; supports parallel connection for >100mA/channel |
| VOUT (Pin 18) | Boost converter output node | Supplies anode side of all LED strings; regulated to minimum voltage needed to sustain 1V at lowest LEDx pin |
| ISET (Pin 4) | LED current programming input | Single resistor to GND sets master current (20–100mA); determines all 8 channels |
| CTRL (Pin 1) | Analog dimming & thermal derating control | Voltage <1V scales LED current linearly; negative TC resistor divider enables ambient temperature derating |
| TSET (Pin 2) | Junction temperature threshold | Resistor divider from VREF to GND sets die temperature breakpoint for automatic current derating |
| FAULT (Pin 16) | Open-LED fault indicator | Active-low open-drain output; latched during PWM low; updates only on PWM high |
| OVPSET (Pin 28) | Overvoltage protection setpoint | Resistor divider from VREF defines max VOUT when all LED strings are open |
| PGND (Pins 10, 19, 29) | Power ground return path | Exposed pad (Pin 29) is primary thermal path-must be soldered to solid copper ground plane |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ dimming | 3000:1 ratio preserves spectral consistency and eliminates color shift at low brightness |
| Adaptive VOUT regulation | Minimizes power dissipation by dynamically adjusting output to lowest voltage sustaining 1V at weakest LED string |
| Independent open-LED fault handling | Non-faulty channels continue operation; FAULT pin signals failure without interrupting illumination |
| Programmable thermal derating | Two-tier protection: ambient (via CTRL) and junction (via TSET) temperature-based current reduction |
| Synchronization capability | SYNC pin accepts external clock up to 1.5MHz; RT resistor set 20% below sync frequency for stable lock |
Applications
| Automotive LCD Backlighting | Notebook Display Backlight |
|---|---|
Use Scenario: Driving 8 parallel LED strings behind TFT-LCD panel in vehicle infotainment system with wide input voltage (6–40V). IC Role / Device Role / Timing Role: Primary LED current controller and boost regulator; manages dynamic VOUT adaptation and open-string fault isolation. Use Value: Enables consistent luminance across temperature (-40°C to 125°C), meets automotive EMC requirements via programmable 100kHz–1MHz switching, and sustains operation during cold-crank (4.5V VIN). | Use Scenario: Powering high-brightness edge-lit LED array in 15.6" notebook display with analog + PWM hybrid dimming. IC Role / Device Role / Timing Role: Multi-channel constant-current source with synchronized switching to suppress beat frequencies in EMI-sensitive portable environment. Use Value: Delivers 3000:1 dimming depth without color shift, supports battery-efficient 20mA–100mA scaling, and reduces thermal load via adaptive VOUT and junction-temperature derating. |
| Industrial HMI Display | Medical Imaging Panel Lighting |
Use Scenario: Illuminating ruggedized touch-panel display in factory automation equipment operating under variable 24V rail conditions. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with real-time open-string diagnostics and programmable UVLO hysteresis for brown-out immunity. Use Value: Maintains illumination integrity during line transients; FAULT pin interfaces directly with PLC I/O for predictive maintenance alerts; ±2% matching ensures uniform brightness across large-area panels. | Use Scenario: Providing flicker-free, color-stable backlight for diagnostic-grade medical LCDs requiring Class I safety compliance and zero visible PWM artifacts. IC Role / Device Role / Timing Role: Precision current regulator with True Color PWM™ and internal soft-start to eliminate inrush-induced image distortion during power-up. Use Value: Meets IEC 60601-1 creepage/clearance via isolated gate drive design; 125°C rated junction enables compact heatsinkless layout; OVPSET prevents LED overvoltage during cable disconnect events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-channel LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3761EFE#TRPBF | Single-channel, higher-current (150mA) boost LED driver with similar architecture but no multi-string matching or FAULT pin | Used where single high-power string replaces multiple lower-current strings; lacks per-channel fault visibility | Select when system requires >100mA per string and channel matching is unnecessary |
| MAX16832ATP+ | 8-channel linear LED driver (no boost); max 40V total string voltage; ±3% current matching; no VOUT adaptation | Requires pre-regulated high-voltage supply; limited to lower-power, fixed-VF applications; no open-LED fault tolerance | Choose for ultra-low-noise, low-EMI applications where input voltage exceeds LED string VF |
Compared with LT3760IFE#TRPBF, LT3761EFE#TRPBF trades channel count and fault diagnostics for higher per-string current and simpler layout, while MAX16832ATP+ sacrifices boost capability and adaptive regulation for lower noise and reduced BOM count in fixed-rail systems.
Availability
LT3760IFE#TRPBF is available at Aetrix Electronics and suitable for automotive backlighting, industrial HMI displays, and medical imaging panels requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to 125°C operation.
Supply support for LT3760IFE#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LT® family of high-performance analog ICs.
The LT3760IFE#TRPBF belongs to Linear's precision LED driver product line, engineered specifically for high-reliability, multi-string backlighting in demanding environments where thermal stability, fault resilience, and color fidelity are critical.
FAQ
What is the maximum LED string voltage supported by the LT3760IFE#TRPBF?
The LT3760IFE#TRPBF supports up to 45V of LEDs per string, with absolute maximum VOUT rating of 60V. Its adaptive regulation ensures VOUT rises only to the minimum voltage required to maintain ≥1V at the lowest LEDx pin, optimizing efficiency across varying forward voltages and temperatures. This capability is confirmed in the Absolute Maximum Ratings table and Typical Application schematic.
How does the LT3760IFE#TRPBF handle an open LED fault in one channel?
The LT3760IFE#TRPBF monitors each LEDx pin voltage continuously; if any pin drops below 0.5V (indicating open circuit), the FAULT pin is pulled low while all remaining functional channels continue regulated operation. The device ignores the open channel and maintains VOUT regulation based on the remaining active strings-ensuring uninterrupted illumination and enabling field-diagnostic capability without system shutdown.
Can the LT3760IFE#TRPBF be synchronized to an external clock, and what are the constraints?
Yes, the LT3760IFE#TRPBF supports external clock synchronization via the SYNC pin (Pin 17). The external clock frequency must be within 0.12–1.5MHz, and the RT resistor should be set for an internal oscillator frequency ~20% lower than the sync signal to ensure reliable locking. This feature is documented in the Electrical Characteristics table and Pin Functions section of the datasheet.
What thermal management requirements apply to the LT3760IFE#TRPBF package?
The LT3760IFE#TRPBF uses a 28-pin TSSOP with exposed PGND pad (Pin 29) that must be soldered to a continuous copper ground plane on the PCB. This pad is the primary thermal path-θJC = 10°C/W-and insufficient soldering causes junction temperature to exceed 125°C under full load. Thermal calculations in the Applications Information section confirm this requirement for sustained 100mA/channel operation.
Is the LT3760IFE#TRPBF compatible with both analog and PWM dimming simultaneously?
Yes, the LT3760IFE#TRPBF supports hybrid dimming: analog dimming via the CTRL pin (0–1V, 25:1 range) sets baseline current, while PWM applied to the PWM pin (0.7–1.4V thresholds) modulates that baseline at up to 3000:1 ratio. The two methods operate independently-the CTRL voltage defines the current level during PWM high periods-enabling fine-grained brightness control without color shift, as verified in the Typical Performance Characteristics plots.
LT3760IFE#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:
- Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 8
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- 6.95V
- Current - Output / Channel:
- 100mA
- Frequency:
- 100kHz ~ 1MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3760IFE#TRPBF FAQ
1.How can I place an order for LT3760IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3760IFE#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 LT3760IFE#TRPBF reliable?
The price and inventory of LT3760IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3760IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3760IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3760IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3760IFE#TRPBF?
LT3760IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3760IFE#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 LT3760IFE#TRPBF?
For technical support, including LT3760IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3760IFE#TRPBF requirements.
6.How does Aetrix verify that LT3760IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3760IFE#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 LT3760IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3760IFE#TRPBF?
All LT3760IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3760IFE#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 LT3760IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3760IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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