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STMicroelectronics LED7708
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- Part No.:
- LED7708
- Manufacturer:
- STMicroelectronics
- Category:
- LED Drivers
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
LED7708.pdf
- Description:
- IC LED DRVR CTRLR PWM 48VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:3,992
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Product details
Overview
LED7708 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, ±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 LED7708 datasheet, LED7708 pinout, LED7708 application, or LED7708 equivalent, this device is selected for high-accuracy multi-channel LED current control in large-panel LCD backlights requiring synchronized dimming, fault detection, and multi-device cascade operation.
Technical Context
The LED7708 integrates two functionally distinct subsystems: a peak-current-mode boost controller (3.6–36 V input, 250 kHz–1 MHz programmable switching frequency, internal 5 V/3.3 V LDOs) and a 16-channel constant-current sink array (40 V-rated, ±2% current accuracy, open/short fault detection). These operate under shared thermal and supply domains but are electrically isolated in signal path.
Its 4-wire serial interface (DIN/DOUT/DCLK/LE) supports three data formats (16×16-bit, 1×256-bit, 1×192-bit), enabling flexible brightness register updates. Grayscale timing is managed either by an on-chip oscillator (FOSC-settable) or external GSCK, with GSSY providing synchronization pulses for inter-device alignment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel count | 16 independent constant-current sinks, each rated for 85 mA continuous output |
| Current accuracy | ±2% per channel - ensures uniform luminance across large LED arrays without per-channel trimming |
| Current matching | ±2% channel-to-channel - critical for consistent grayscale rendering in local dimming zones |
| Input voltage range | 3.6 V to 36 V - supports wide-range DC supplies including automotive battery and industrial 24 V rails |
| Switching frequency | 250 kHz to 1 MHz - adjustable via FSW pin; enables EMI optimization and inductor size reduction |
| Grayscale resolution | Selectable 12-bit or 16-bit - provides 4096 or 65536 brightness levels per channel for high-fidelity dimming |
| Fault detection | Open-LED and short-circuit detection per channel - enables fail-safe backlight operation with XFLT assertion |
| Interface speed | 30 MHz serial clock - allows full 256-bit brightness update in ≤8.5 µs, minimizing display latency |
Pinout & Package
The LED7708 is housed in a VFQFPN-48 (7 mm × 7 mm, 1.0 mm height, exposed pad) thermally enhanced package optimized for 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 |
| CH1–CH16 | Current sink outputs | 16 dedicated high-side referenced current sinks; each drives one LED string cathode |
| GATE | External MOSFET gate driver | High-current push-pull output driving external N-channel power MOSFET in boost stage |
| FOSC | Dimming oscillator control | Resistor-to-ground sets internal grayscale clock frequency; open = disable oscillator |
| XFLT | Fault indicator | Open-drain active-low output asserting on any detected fault (open/short/thermal/OV/OC) |
| GSSY | Grayscale sync I/O | Outputs end-of-dimming-cycle pulse when internal oscillator enabled; accepts VSYNC input when disabled |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive boost output voltage | Minimizes power loss by dynamically adjusting VOUT to match minimum forward voltage of active LED strings |
| Multi-device synchronization | Master/slave chaining via IOK/XVOK/XOVF/XMSK pins enables coordinated voltage regulation and fault masking across multiple LED7708s |
| Programmable grayscale latency | GSLAT register configures delay between brightness register write and dimming waveform update - prevents visual artifacts during dynamic updates |
| Dedicated fault management options | Configurable response to open/short faults (latch-off, auto-retry, ignore) via DEVCFG registers - supports diverse system-level safety requirements |
| Continuous status reading | CHSTA register allows real-time polling of all 16 channel fault states over serial interface without interrupt overhead |
Applications
| TV Backlight Units | Monitor Backlight Systems |
|---|---|
Use Scenario: Driving edge-lit or direct-lit LED arrays behind 40–85 inch LCD panels with local dimming zones. IC Role / Device Role / Timing Role: Primary LED current controller and boost regulator; manages per-zone dimming timing via GSSY-synchronized 16-bit grayscale PWM. Use Value: Enables >10,000:1 contrast ratio through precise per-channel current control and sub-frame latency compensation. | Use Scenario: Powering high-brightness WLED arrays in commercial-grade 24–32 inch monitors with flicker-free dimming. IC Role / Device Role / Timing Role: Constant-current sink array with integrated boost; uses internal dimming oscillator (FOSC) for jitter-free 200 Hz+ PWM. Use Value: Eliminates need for external timing IC and reduces BOM count while maintaining ±2% luminance uniformity. |
| RGB Backlight Solutions | Large-Format Digital Signage |
Use Scenario: Driving separate red, green, and blue LED strings for color-tunable backlighting in premium displays. IC Role / Device Role / Timing Role: Independent per-channel current control with selectable 12/16-bit grayscale; CHSEL register enables grouped RGB channel updates. Use Value: Supports accurate white-point tuning and dynamic gamut adjustment without inter-channel crosstalk. | Use Scenario: Backlighting 55–110 inch digital signage panels requiring high reliability and thermal robustness. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with open/short detection per channel and thermal shutdown; operates up to 85 °C ambient. Use Value: Reduces field failure rate via early fault detection and graceful degradation (e.g., zone bypass on single-string failure). |
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 | 16-channel, 120 mA sink; no integrated boost controller; relies on external supply; 30 MHz SPI interface | Suitable only where regulated high-voltage rail is already available; lacks adaptive voltage control and fault-handling features | Choose when system already includes a high-efficiency boost stage and cost-sensitive design prioritizes channel count over integration |
| ISL97693 | 16-channel, 80 mA sink; integrated boost; 2-wire I²C interface; no master/slave sync or grayscale latency control | Limited to simpler backlight topologies; lacks GSSY synchronization and multi-device coordination capability | Prefer for space-constrained designs needing I²C compatibility, but avoid where inter-device timing alignment is required |
Compared with TLC5947 and ISL97693, the LED7708 uniquely combines adaptive boost regulation, GSSY-synchronized multi-device dimming, and configurable fault response - making it optimal for high-end LCD backlight systems demanding both efficiency and precise temporal control.
Availability
LED7708 is available at Aetrix Electronics and suitable for TV backlight units, monitor backlight systems, and RGB backlight solutions requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LED7708 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The LED7708 belongs to ST's LED lighting driver product line, engineered specifically for high-channel-count, high-accuracy LCD panel backlighting with integrated power conversion and advanced fault management.
FAQ
What is the maximum number of LED7708 devices that can be cascaded in master/slave configuration?
Up to 8 LED7708 devices can be chained using IOK, XVOK, XOVF, and XMSK pins for coordinated output voltage regulation and fault masking. Each slave device asserts handshake signals to adjust master boost output, enabling uniform LED string voltage across large-area backlights without external supervision.
How does the LED7708 achieve ±2% channel current matching across temperature?
The LED7708 uses matched on-chip current mirror circuitry with trimmed reference resistors and thermal coupling between channels. Its dual ground structure (AGND/SGND) isolates analog current paths from digital noise, and the ±2% matching is guaranteed over –40 °C to +85 °C ambient per datasheet Table 6.
Can the LED7708 drive LEDs in parallel per channel, and what are the limitations?
Yes - channels may be paralleled externally to increase per-string current beyond 85 mA, but total power dissipation per channel must remain ≤0.5 W and junction temperature ≤150 °C. Parallel operation requires identical LED forward voltages and PCB layout symmetry to maintain current sharing within ±2% tolerance.
What protection features activate during an LED short-circuit event?
On LED short detection, the LED7708 asserts XFLT low, disables the affected channel's current sink, and logs the fault in CHSTA register. If configured for latch-off mode (DEVCFG0[7]), the channel remains off until reset; if set for auto-retry, it re-enables after 100 ms and rechecks. No boost controller shutdown occurs unless overcurrent protection triggers separately.
LED7708 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tray
- 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)
LED7708 FAQ
1.How can I place an order for LED7708 through Aetrix?
Please submit a Request for Quotation (RFQ) for LED7708 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 LED7708 reliable?
The price and inventory of LED7708 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LED7708 is usually 5 days.
3.What payment methods are accepted for LED7708?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LED7708 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LED7708?
LED7708 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LED7708 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 LED7708?
For technical support, including LED7708 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LED7708 requirements.
6.How does Aetrix verify that LED7708 is sourced from the original manufacturer or authorized distributors?
All LED7708 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 LED7708 meets industry standards.
7.What is the process for return or replacement of LED7708?
All LED7708 units undergo pre-shipment inspection (PSI). If there is an issue with LED7708, 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 LED7708 part is unused and in its original packaging.
Return procedure for LED7708:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LED7708 Tags
-
BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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