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Analog Devices Inc. LT3760EFE#PBF
- Part No.:
- LT3760EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3760EFE#PBF.pdf
- Description:
- IC LED DRVR CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:655
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Product details
Overview
LT3760EFE#PBF 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 total LED string voltage at 100mA per channel. It features programmable LED current (20–100mA), 3000:1 True Color PWM dimming, and adaptive VOUT regulation for optimal efficiency in automotive backlighting systems.
For engineers reviewing the LT3760EFE#PBF datasheet, LT3760EFE#PBF pinout, LT3760EFE#PBF application, or LT3760EFE#PBF equivalent, key selection considerations include its 28-pin TSSOP thermal performance, open-LED fault tolerance across all eight channels, ±0.7% typical current matching at 40mA, and programmable junction temperature derating via TSET pin.
Technical Context
The LT3760EFE#PBF implements a current-mode boost topology with dual transconductance error amplifiers-one regulating LED string voltage (to maintain ≥1V at each LEDx pin) and another enabling programmable overvoltage protection (OVP) when all strings open. Its VC pin controls peak inductor current and duty cycle, while slope compensation ensures stability above 50% duty cycle.
It supports synchronized switching via SYNC pin (0.12–1.5MHz range), single-resistor frequency programming (100kHz–1MHz), and independent analog dimming (CTRL pin, 25:1 range) alongside PWM dimming (PWM pin, 3000:1). Internal 7V INTVCC LDO powers the gate driver, with UVLO thresholds at 3.4V (falling) and 3.8V (rising).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 8 independent constant-current sinks, each programmable 20–100mA via ISET resistor |
| Current Matching | ±2% max deviation across channels at 40mA; ±0.7% typical - enables uniform brightness in multi-string displays |
| PWM Dimming Range | 3000:1 true-color ratio - preserves color fidelity during deep dimming without flicker or hue shift |
| Switching Frequency | Programmable 100kHz–1MHz via RT resistor or external SYNC clock - balances EMI, efficiency, and component size |
| VOUT Rating | 60V absolute max; adapts dynamically to LED VF - minimizes power loss by regulating only to required string voltage |
| OVP Protection | User-programmable via OVPSET pin (e.g., 12.5V to 57V) - prevents damage if all LED strings open simultaneously |
| Junction Temp Range | –40°C to +125°C - validated for automotive cabin and industrial display environments |
Pinout & Package
LT3760EFE#PBF is housed in a thermally enhanced 28-pin plastic TSSOP package (FE grade) with exposed PGND pad (Pin 29) requiring soldering to PCB ground plane for thermal management (θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED1–LED8 (Pins 6–9, 20–23) | Constant-current sink outputs | Each drives LED string cathode; 1V compliance voltage ensures regulation even when PVIN > VOUT |
| VOUT (Pin 18) | Boost converter output | Supplies anode side of all LED strings; voltage adapts to lowest LEDx pin voltage to minimize loss |
| ISET (Pin 4) | LED current reference input | Resistor to GND sets master current (20–100mA); enables channel paralleling for higher current |
| CTRL (Pin 1) | Analog dimming & thermal derating control | Voltage <1V linearly scales LED current; negative TC divider enables ambient temperature-based derating |
| TSET (Pin 2) | Junction temperature breakpoint | Resistor divider from VREF programs die temp threshold beyond which LED current derates |
| FAULT (Pin 16) | Open-LED fault flag | Active-low open-drain output; latched during PWM low; indicates any open string without affecting others |
| PGND (Pins 10, 19, 29) | Power ground return path | Exposed pad (Pin 29) is primary thermal path - must be soldered to large copper area for 125°C operation |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VOUT regulation | Maintains minimum 1V at lowest LEDx pin - eliminates excess headroom and improves system efficiency by up to 9% |
| True Color PWM™ dimming | 3000:1 ratio with no color shift - achieved via precise timing control and fast gate drive (30ns rise/fall) |
| Programmable OVP level | Set via OVPSET resistor divider (e.g., 0.22V → 12.5V; 1V → 57V) - protects LEDs during reconnection after open-circuit fault |
| Integrated thermal derating | TSET pin allows user-defined junction temperature threshold (e.g., 100°C) to reduce LED current before thermal shutdown |
| Hiccup-mode overcurrent protection | Limits MOSFET fault energy by disabling switching for ~2ms after overcurrent - reduces stress on external FET and heatsink requirements |
Applications
| Automotive Instrument Cluster Backlighting | Notebook Display Edge Lighting |
|---|---|
Use Scenario: Driving 8 parallel LED strings behind TFT LCD in vehicle dashboards with wide ambient temperature range (–40°C to +85°C). IC Role / Device Role / Timing Role: Constant-current LED driver with adaptive VOUT and open-LED fault isolation - maintains illumination integrity even if one string fails. Use Value: ±0.7% typical current matching ensures uniform luminance across gauges; TSET-enabled derating prevents thermal runaway near engine heat sources. | Use Scenario: Slim-profile edge-lit LED backlight for 13–15″ notebook displays requiring high contrast and deep dimming. IC Role / Device Role / Timing Role: 8-channel PWM-dimmable boost driver with 3000:1 True Color PWM - delivers flicker-free, color-stable dimming down to 0.03% brightness. Use Value: Adaptive VOUT reduces power dissipation by 12% vs fixed-output boost; 28-pin TSSOP fits tight board space with exposed pad for passive cooling. |
| Industrial HMI Panel Lighting | Medical Diagnostic Monitor Backlight |
Use Scenario: Ruggedized human-machine interface panel operating continuously in factory environments with dust, vibration, and voltage transients. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with SHDN/UVLO hysteresis and FAULT pin reporting - enables predictive maintenance and safe fail-operational behavior. Use Value: Programmable UVLO (via SHDN/UVLO resistor divider) rejects brownouts; open-LED detection avoids false alarms during partial string replacement. | Use Scenario: High-reliability diagnostic monitor backlight where color accuracy, stability, and zero downtime are critical. IC Role / Device Role / Timing Role: Precision current-regulated LED driver with ±2% matching and 1V LEDx compliance - guarantees consistent white point across display lifetime. Use Value: Dual error amplifiers (LED + OVP) ensure safe operation during LED aging or sudden disconnect; INTVCC UVLO prevents gate drive collapse under supply sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-channel LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409QMH/NOPB | Single-channel, adjustable-frequency buck-boost LED controller; no integrated multi-channel current sinks | Requires external current-sense and channel multiplexing for 8-string operation - increases BOM count and layout complexity | Choose LM3409QMH/NOPB only for designs needing flexible topology (buck, boost, SEPIC) with discrete channel control. |
| MAX16820ATL+T | 8-channel linear LED driver (no boost converter); max 40V total string voltage; 30mA/channel | Limited to low-VF, low-power strings; no VOUT adaptation or open-LED fault tolerance - unsuitable for 45V automotive strings | Select MAX16820ATL+T only for compact, low-noise, low-EMI applications with ≤40V strings and <30mA per channel. |
Compared with LM3409QMH/NOPB and MAX16820ATL+T, the LT3760EFE#PBF uniquely integrates both 8-channel precision current regulation and adaptive boost conversion in one 28-pin TSSOP, eliminating external current mirrors and simplifying thermal design for high-brightness, high-VF LED arrays.
Availability
LT3760EFE#PBF is available at Aetrix Electronics and suitable for automotive instrument clusters, notebook display backlights, industrial HMIs, and medical diagnostic monitors requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LT3760EFE#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for the LT® product family, including precision analog and power management ICs.
The LT3760EFE#PBF belongs to Linear's high-performance LED driver product line, designed specifically for multi-string, high-brightness backlighting in automotive, industrial, and medical displays where reliability, current matching, and fault resilience are critical.
FAQ
What is the maximum LED string voltage supported by the LT3760EFE#PBF?
The LT3760EFE#PBF supports up to 45V of total LED forward voltage per string, with absolute maximum VOUT rating of 60V. Its adaptive regulation ensures VOUT rises only to the minimum voltage needed to maintain 1V compliance at the lowest LEDx pin, optimizing efficiency across varying LED VF and temperature.
How does the LT3760EFE#PBF handle an open LED string fault?
The LT3760EFE#PBF monitors each LEDx pin voltage; if any drops below 0.5V (indicating open circuit), the FAULT pin is pulled low. Crucially, unaffected channels continue regulated operation - no impact on remaining LED strings. If all strings open, VOUT is clamped at the OVPSET-defined level (e.g., 57V) to prevent overvoltage damage.
Can the LT3760EFE#PBF drive more than 100mA per channel?
Yes - the LT3760EFE#PBF supports channel paralleling: connecting two or more LEDx pins together doubles or triples the effective current sink capability (e.g., two channels → 200mA). The ISET resistor remains unchanged, preserving ±2% matching across paralleled groups, and thermal limits must be verified using θJA = 28°C/W.
What is the purpose of the TSET pin on the LT3760EFE#PBF?
The TSET pin on the LT3760EFE#PBF programs the junction temperature threshold at which LED current begins linear derating. Using a resistor divider from VREF to GND, users set a breakpoint (e.g., 105°C); above that temperature, LED current reduces proportionally to protect LEDs and extend lifetime - critical for sealed automotive or medical enclosures.
Does the LT3760EFE#PBF require an external Schottky diode?
Yes - the LT3760EFE#PBF is a controller IC and requires an external Schottky rectifier in the boost stage. Diode selection must meet: reverse voltage > max VOUT (e.g., 60V+), average current > total LED current, and low leakage (<1µA) to sustain 3000:1 PWM dimming ratio during off periods. Recommended vendors include Diodes Inc., Vishay, and ON Semiconductor.
LT3760EFE#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:
- 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
LT3760EFE#PBF FAQ
1.How can I place an order for LT3760EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3760EFE#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 LT3760EFE#PBF reliable?
The price and inventory of LT3760EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3760EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3760EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3760EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3760EFE#PBF?
LT3760EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3760EFE#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 LT3760EFE#PBF?
For technical support, including LT3760EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3760EFE#PBF requirements.
6.How does Aetrix verify that LT3760EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3760EFE#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 LT3760EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3760EFE#PBF?
All LT3760EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3760EFE#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 LT3760EFE#PBF part is unused and in its original packaging.
Return procedure for LT3760EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3760EFE#PBF Tags
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BCR430UXTSA2
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BCR420UE6433HTMA1
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LYT1604D-TL
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
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BCR421UW6-7
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BCR420UFD-7
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