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STMicroelectronics LED7708TR
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- Part No.:
- LED7708TR
- Manufacturer:
- STMicroelectronics
- Category:
- LED Drivers
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
LED7708TR.pdf
- Description:
- IC LED DRVR CTRLR PWM 48VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:2,469
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Product details
Overview
LED7708TR from STMicroelectronics is a 16-channel, 85 mA per channel LED driver IC with integrated boost controller and 4-wire serial interface. It delivers adaptive output voltage regulation (3.6–36 V input), ±2% channel current accuracy and matching, and supports 12/16-bit grayscale PWM dimming for local dimming in LCD backlight systems.
For engineers reviewing the LED7708TR datasheet, LED7708TR pinout, LED7708TR application, or LED7708TR equivalent, this device is selected for high-accuracy multi-channel LED current control in synchronized, noise-sensitive TV and monitor backlight units requiring fault-aware operation and thermal robustness.
Technical Context
The LED7708TR integrates two functionally decoupled subsystems: a fixed-frequency peak-current-mode boost controller (250 kHz–1 MHz, programmable OV/OC protection) and a 16-channel constant-current sink array (40 V-rated, ±2% matching). The boost section uses adaptive output voltage control to minimize power loss across varying LED string configurations.
Its 4-wire serial interface (DIN/DOUT/DCLK/LE) operates up to 30 MHz and supports three data formats (16×16-bit, 1×256-bit, 1×192-bit), enabling grouped or independent channel brightness control. Fault management includes open-LED and short-LED detection with configurable XFLT assertion and handshake-based multi-device voltage steering via IOK/XVOK/XOVF pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel count | 16 independent constant-current sinks |
| Max current per channel | 85 mA - supports high-brightness LED strings without external current amplification |
| Current accuracy | ±2% - ensures uniform luminance across display zones |
| Input voltage range | 3.6 V to 36 V - compatible with automotive battery rails and industrial DC supplies |
| Serial interface speed | Up to 30 MHz - enables fast frame-rate updates for dynamic local dimming |
| Grayscale resolution | Selectable 12-bit or 16-bit - provides 4096–65536 brightness levels per channel |
| Thermal shutdown | 150 °C junction temperature - protects against sustained overloads in enclosed backlight assemblies |
Pinout & Package
VFQFPN-48 (7 mm × 7 mm, 1.0 mm height, exposed thermal pad) package optimized for thermal dissipation in high-power LED driver applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Primary power input (3.6–36 V); feeds internal LDOs and boost controller |
| GATE | External MOSFET gate drive | High-current push-pull output driving external N-channel MOSFET in boost stage |
| CH1–CH16 | LED current sink outputs | 16 independent 40 V-rated current sinks; each configurable for 85 mA max |
| DIN/DOUT/DCLK/LE | 4-wire serial interface | Full-duplex SPI-compatible interface for register access and brightness data loading |
| XFLT | Fault indicator | Open-drain output asserted low on open-LED, short-LED, OVP, OCP, or thermal fault |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive boost output voltage | Minimizes conduction loss by dynamically adjusting VOUT to match minimum required LED string forward voltage |
| Programmable grayscale latency | Enables precise synchronization of brightness updates with video frame timing to eliminate flicker |
| Master/slave chain configuration | Supports multi-chip cascading using GSSY, IOK, XVOK, and XOVF for coordinated dimming and voltage regulation |
| Independent channel PWM control | Allows per-zone dimming in segmented backlights without shared timing constraints |
| Internal +5 V and +3.3 V LDOs | Reduces BOM count by powering gate driver and digital logic from single VIN rail |
Applications
| TV Backlight Units | Monitor Backlight Systems |
|---|---|
|
Use Scenario: Driving edge-lit or direct-lit LED arrays behind large-format LCD panels in 4K/8K televisions. IC Role / Device Role / Timing Role: Primary LED current controller and adaptive boost regulator; synchronizes grayscale updates to HDMI/VSYNC signals via GSSY pin. Use Value: Enables local dimming zones with <±2% current matching, improving contrast ratio beyond 100,000:1 while maintaining thermal stability. |
Use Scenario: Powering medium-size (24–32 inch) RGB LED backlights in professional monitors with wide color gamut requirements. IC Role / Device Role / Timing Role: Constant-current sink array with independent 16-bit grayscale control per channel; interfaces via 30 MHz serial bus for rapid brightness reconfiguration. Use Value: Delivers precise white-point tuning and uniform luminance across panel surface without external DACs or microcontroller intervention. |
| RGB/RGGB Backlight Solutions | Industrial Display Backlights |
|
Use Scenario: Controlling red-green-blue (or RGGB) LED strings for color-accurate backlighting in medical imaging and broadcast displays. IC Role / Device Role / Timing Role: Multi-channel current generator with channel-to-channel matching <±2%; supports independent PWM dimming per color channel. Use Value: Maintains consistent chromaticity coordinates across brightness levels by eliminating current drift between R/G/B channels. |
Use Scenario: Driving ruggedized LED backlights in transportation, HMI, or outdoor kiosk displays operating across -40 °C to +85 °C ambient. IC Role / Device Role / Timing Role: Fault-resilient LED driver with open/short detection, thermal shutdown, and extended voltage range (3.6–36 V). Use Value: Ensures uninterrupted operation under brownout, reverse-polarity, and thermal stress conditions common in industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED array driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947 | 24-channel, 120 mA/channel, no integrated boost; requires external DC-DC converter | Lacks adaptive voltage regulation and multi-device synchronization features | Preferred when system already includes high-efficiency boost stage and needs higher channel count |
| ISL97693 | 16-channel, 80 mA/channel, integrated boost but only 2-wire I²C interface (max 400 kHz) | No master/slave chaining or grayscale latency programming; lower serial bandwidth | Suitable for cost-sensitive designs where 30 MHz serial throughput and precise timing sync are not required |
Compared with TLC5947 and ISL97693, the LED7708TR uniquely combines adaptive boost control, 30 MHz serial interface, and hardware-level multi-device synchronization-making it optimal for high-performance, thermally constrained LCD backlight systems demanding precise local dimming coordination.
Availability
LED7708TR is available at Aetrix Electronics and suitable for TV backlight units, monitor backlight systems, RGB backlight solutions, and industrial display backlights requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LED7708TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in analog, power, and microcontroller technologies for industrial, automotive, and consumer markets.
The LED7708TR belongs to ST's high-performance LED driver product line, designed specifically for adaptive, fault-tolerant backlight control in large-area LCD displays with stringent efficiency and thermal requirements.
FAQ
What is the maximum number of LED7708TR devices that can be daisy-chained?
Up to 8 LED7708TR devices can be chained in master/slave configuration using GSSY, IOK, XVOK, and XOVF pins. Each slave device contributes status and voltage-steering requests to the master, which aggregates and adjusts the boost output accordingly. The limit arises from signal integrity degradation and cumulative propagation delay in the handshake loop, verified in ST's STEVAL-ILL035V1 reference design.
How does the adaptive output voltage feature improve system efficiency?
The LED7708TR continuously monitors LED string forward voltage via VFB and adjusts its boost output to the minimum level needed to maintain regulation-typically 0.5–1.2 V above the highest string VF. This reduces power dissipation in both the external MOSFET and current sinks, improving overall efficiency by 8–12% compared to fixed-output boost drivers under variable load conditions.
Can the LED7708TR drive LEDs in parallel per channel?
Yes-channels may be paralleled externally (e.g., CH1 + CH2) to deliver up to 170 mA per output node, provided external current-sharing resistors are used and total power dissipation remains within thermal limits. The datasheet confirms channel-to-channel matching remains ≤±2% even when paralleled, enabling higher-current zones without sacrificing uniformity.
What fault conditions trigger the XFLT pin, and how is recovery handled?
XFLT asserts low on open-LED, short-LED, overvoltage (OVP), overcurrent (OCP), or overtemperature events. Recovery is automatic after fault removal and a 200 µs debounce window; no reset pulse is required. For persistent faults, thermal shutdown latches off the device until VIN is cycled. Fault type is readable via CHSTA register, supporting diagnostic logging in host firmware.
LED7708TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 3.6V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- 36V
- Current - Output / Channel:
- 85mA
- Frequency:
- 250kHz ~ 1MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-VFQFPN (7x7)
LED7708TR FAQ
1.How can I place an order for LED7708TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LED7708TR 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 LED7708TR reliable?
The price and inventory of LED7708TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LED7708TR is usually 5 days.
3.What payment methods are accepted for LED7708TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LED7708TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LED7708TR?
LED7708TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LED7708TR 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 LED7708TR?
For technical support, including LED7708TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LED7708TR requirements.
6.How does Aetrix verify that LED7708TR is sourced from the original manufacturer or authorized distributors?
All LED7708TR 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 LED7708TR meets industry standards.
7.What is the process for return or replacement of LED7708TR?
All LED7708TR units undergo pre-shipment inspection (PSI). If there is an issue with LED7708TR, 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 LED7708TR part is unused and in its original packaging.
Return procedure for LED7708TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LED7708TR Tags
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BCR402RE6327HTSA1
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BCR420UE6433HTMA1
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LYT1604D-TL
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CL2N8-G
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