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STMicroelectronics ALED7707TR
- Part No.:
- ALED7707TR
- Manufacturer:
- STMicroelectronics
- Category:
- LED Drivers
- Package:
- 24-VQFN Exposed Pad
- Datasheet:
-
ALED7707TR.pdf
- Description:
- IC LED DRVR RGLTR PWM 85MA 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,000
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Product details
Overview
ALED7707TR from STMicroelectronics is an AEC-Q100 qualified automotive LED driver IC integrating a boost converter and six independent current-sink channels for LCD panel backlighting. It delivers up to 85 mA per row, supports 4.5–36 V input, regulates output up to 36 V, and features PWM dimming with ≤10 µs minimum on-time and ±3% inter-row current matching - deployed in infotainment displays and dashboard backlighting.
For engineers reviewing the ALED7707TR datasheet, ALED7707TR pinout, ALED7707TR application, or ALED7707TR equivalent, key selection criteria include its integrated 36 V boost regulator, six-channel 85 mA current sinking capability, AEC-Q100 qualification, open/short LED fault detection, and programmable soft-start and OVP - all in a QFN 5×5 mm 24-lead package.
Technical Context
The ALED7707TR implements a constant-frequency peak current-mode boost controller with internal 570 mΩ MOSFET and programmable 250 kHz–1 MHz switching frequency. Its feedback loop uses a dedicated minimum-voltage selector across six rows to regulate output voltage based on the highest forward voltage string plus a 700 mV reference.
The backlight section employs six matched current generators with external RILIM-based programming (KR = 1850 V typ.), ±3% matching, and fault-aware MODE pin logic that distinguishes open-circuit (floating row) from short-circuit (3.8 V threshold) conditions - both reported via open-drain FAULT pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 36 V - supports direct connection to automotive battery rail including cold-crank (4.5 V) and load-dump (36 V) transients. |
| Max Output Voltage | 36 V - enables driving up to 10 white LEDs in series per row at typical VF. |
| Row Current Range | Programmable up to 85 mA per channel via RILIM - sets LED brightness and thermal load per string. |
| Current Matching | ±3% between rows - ensures uniform luminance across multi-string LCD backlight arrays. |
| Dimming Minimum On-Time | <10 µs - supports high-resolution 1 kHz PWM dimming down to 1% duty cycle without visible flicker. |
| Switching Frequency | 250 kHz to 1 MHz (adjustable) or 660 kHz default - balances EMI, efficiency, and inductor size in space-constrained automotive modules. |
| Fault Detection | Open- and short-circuit LED detection per row - enables fail-safe backlight management and diagnostic reporting via FAULT pin. |
Pinout & Package
Package: QFN 5×5 mm, 24-lead, exposed thermal pad (TPAD), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ROW1–ROW6 | Current-sink outputs | Each drives one LED string; sink current set by RILIM; supports floating row detection when unused. |
| VIN | Main power input | Accepts 4.5–36 V supply; feeds internal LDO5 and boost switch; requires local bulk capacitance. |
| LX | Switching node | Drain of internal 570 mΩ MOSFET; connects to boost inductor and output capacitor; high dv/dt node. |
| COMP | Error amplifier output | Connects RC compensation network to stabilize boost control loop; critical for transient response. |
| RILIM | Current generator setting | Resistor-to-SGND sets row current gain (KR = 1850 V); determines max 85 mA sink capability. |
| FSW | Freq. select / sync input | Resistor-to-SGND sets switching frequency; accepts external 220–1000 kHz sync signal for multi-device coherence. |
| FAULT | Open-drain fault indicator | Pulled low on open/short LED fault or thermal shutdown; requires external pull-up for system-level diagnostics. |
| SS | Soft-start timing | Capacitor-to-SGND sets ramp time; controls inrush current and prevents output overshoot during startup. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Guarantees operation from −40 °C to +125 °C junction temperature - validated for under-hood and instrument cluster environments. |
| Integrated 5 V LDO (LDO5) | Supplies internal analog circuitry and MOSFET gate driver; delivers up to 40 mA; eliminates need for external bias rail. |
| Programmable OVP via OVSEL | External resistor divider sets overvoltage threshold (1.145 V reference); prevents damage during LED string disconnection. |
| Pulse-skip mode at light load | Reduces quiescent current to 2.8 mA (typ.) - extends battery life in always-on display applications. |
| Thermal shutdown with hysteresis | Turns off at 150 °C; restarts at 120 °C - protects against sustained overload or poor PCB heatsinking. |
Applications
| Infotainment LCD Backlight | Dashboard Instrument Cluster |
|---|---|
Use Scenario: High-brightness, wide-temperature TFT-LCD backlight in center-stack head units. IC Role / Device Role / Timing Role: Six-channel current sink with synchronized PWM dimming and boost regulation for uniform luminance across segmented display zones. Use Value: ±3% current matching ensures consistent color and brightness; AEC-Q100 compliance guarantees reliability over 15-year vehicle lifecycle. | Use Scenario: Analog/digital gauge cluster with dynamic contrast and night/day mode switching. IC Role / Device Role / Timing Role: LED driver managing multiple backlight zones (speedometer, tachometer, warning icons) with independent dimming control. Use Value: <10 µs minimum dimming on-time enables smooth 1 kHz PWM transitions; fault detection prevents single-LED failure from disabling full cluster illumination. |
| Daytime Running Lights (DRL) | Interior Ambient Lighting |
Use Scenario: Linear LED array in front fascia DRL module requiring precise current regulation and thermal resilience. IC Role / Device Role / Timing Role: Constant-current boost driver powering 6 parallel strings; leverages built-in OVP and thermal shutdown for safety-critical lighting. Use Value: 36 V output supports long LED strings; pulse-skip mode reduces standby power during ignition-off periods. | Use Scenario: RGB or white LED mood lighting in door panels, footwells, and overhead consoles. IC Role / Device Role / Timing Role: Multi-channel current sink enabling zone-based dimming profiles and fade effects via PWM input. Use Value: ROW disable option allows partial activation; soft-start prevents inrush-induced voltage sag on shared 12 V bus. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8863T-13 | Single-channel, 150 mA, no integrated boost; requires external inductor and FET; lacks AEC-Q100 rating. | Suitable for non-automotive portable displays; not qualified for automotive temperature or reliability requirements. | Select only for cost-sensitive consumer-grade LCDs where AEC-Q100 is unnecessary. |
| MAX20050ATP/V+T | 6-channel, 100 mA, integrated boost, AEC-Q100 Grade 1; higher max current but no floating row detection or SYNC output. | Better suited for high-current backlighting where row disable is not required; lacks multi-device synchronization capability. | Prefer when higher per-row current (>85 mA) is needed and system-level sync is handled externally. |
Compared with AL8863T-13 and MAX20050ATP/V+T, the ALED7707TR uniquely combines AEC-Q100 qualification, six-channel programmable current sinking, open/short LED fault reporting, and master/slave synchronization - making it optimal for safety-aware, multi-display automotive systems requiring coordinated dimming and diagnostics.
Availability
ALED7707TR is available at Aetrix Electronics and suitable for infotainment LCD backlight, dashboard instrument clusters, and daytime running lights requiring stable component supply across extended automotive production cycles.
Supply support for ALED7707TR 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 microcontrollers, power ICs, sensors, and automotive-grade analog devices.
The ALED7707TR belongs to ST's automotive LED driver product line, engineered specifically for AEC-Q100-compliant LCD backlighting in harsh-temperature vehicle environments - emphasizing fault resilience, EMI robustness, and multi-string current precision.
FAQ
What is the maximum number of LEDs the ALED7707TR can drive per row?
The ALED7707TR supports up to 10 white LEDs per row when operating at its maximum 36 V output voltage and typical LED forward voltage of ~3.6 V. This assumes a total forward voltage drop of ~36 V, leaving margin for the 700 mV current-sense reference. Row current must be set below 85 mA to maintain thermal stability and regulation accuracy.
How does the ALED7707TR handle an open LED fault in one row?
When an open LED fault occurs in any row, the corresponding ROWx voltage collapses to near 0 V. The internal minimum-voltage selector detects this condition and triggers the FAULT pin to assert low. If the MODE pin is tied to SGND, the device disables the affected row while maintaining operation of remaining rows - confirmed in Section 5.3.3 of the datasheet.
Can the ALED7707TR synchronize switching frequency with other LED drivers?
Yes - the FSW pin serves dual function: resistor-programmed frequency setting or external synchronization input. Applying a 220–1000 kHz clock signal with 200–400 mV swing and ≥270 ns pulse width locks the ALED7707TR to the external source. The SYNC pin provides a 28–40% duty-cycle output for daisy-chaining additional devices.
Is an external Schottky diode required for the boost stage?
No - the ALED7707TR integrates a 570 mΩ internal power MOSFET and uses synchronous rectification architecture; no external flyback diode is needed. The LX node connects directly to the boost inductor and output capacitor. Layout must minimize parasitic inductance on LX and PGND paths to ensure stable operation and EMI compliance.
ALED7707TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 24-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 4.5V
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (5x5)
ALED7707TR FAQ
1.How can I place an order for ALED7707TR through Aetrix?
Please submit a Request for Quotation (RFQ) for ALED7707TR 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 ALED7707TR reliable?
The price and inventory of ALED7707TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALED7707TR is usually 5 days.
3.What payment methods are accepted for ALED7707TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALED7707TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALED7707TR?
ALED7707TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALED7707TR 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 ALED7707TR?
For technical support, including ALED7707TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALED7707TR requirements.
6.How does Aetrix verify that ALED7707TR is sourced from the original manufacturer or authorized distributors?
All ALED7707TR 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 ALED7707TR meets industry standards.
7.What is the process for return or replacement of ALED7707TR?
All ALED7707TR units undergo pre-shipment inspection (PSI). If there is an issue with ALED7707TR, 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 ALED7707TR part is unused and in its original packaging.
Return procedure for ALED7707TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALED7707TR Tags
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LYT1604D-TL
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