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STMicroelectronics EVALED7706
- Part No.:
- EVALED7706
- Manufacturer:
- STMicroelectronics
- Category:
- LED Driver Evaluation Boards
- Package:
- Datasheet:
-
EVALED7706.pdf
- Description:
- EVALUATION BOARD FOR LED7706
- Quantity:
- Payment:
- Shipping:
Inventory:2,547
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Product details
Overview
LED7706 from STMicroelectronics is a monolithic 6-channel LED backlight driver IC integrating a boost converter and six precision current sinks for LCD panel backlighting. It operates from 4.5 V to 36 V input, delivers up to 36 V output, supports 30 mA per channel with ±2 % current matching, and enables PWM dimming down to 1 % duty cycle at 20 kHz - used in LCD monitors, TV panels, and GPS displays.
For engineers reviewing the LED7706 datasheet, LED7706 pinout, LED7706 application, or LED7706 equivalent, key selection criteria include its integrated 280 mΩ MOSFET, programmable soft-start via SS pin, open/short LED fault detection with FAULT pin reporting, and VFQFPN-24 4×4 mm exposed-pad package for thermal management in space-constrained backlight designs.
Technical Context
The LED7706 implements a constant-frequency peak current-mode boost controller with internal 280 mΩ power MOSFET and dedicated slope compensation (via SLOPE pin) to prevent subharmonic oscillation. Its feedback loop regulates output voltage by sensing the minimum forward voltage across six LED rows and comparing it to a 400 mV reference, enabling dynamic rail optimization.
The backlight section uses six matched current generators controlled by RILIM resistor programming, each capable of sinking up to 30 mA with <500 ns minimum PWM on-time. Fault management is hardware-based: MODE pin selects between open-LED (3.4 V threshold) and shorted-LED (6.0 V threshold) detection modes, with FAULT pin asserting open-drain low on violation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 36 V - supports wide-range DC supplies including automotive 12 V and industrial 24 V rails. |
| Boost Output Voltage | Up to 36 V - sufficient to drive up to 10 white LEDs (3.6 V VF each) in series per row. |
| Channel Current Accuracy | ±2 % matching between rows - ensures uniform brightness across multi-row LCD backlights. |
| PWM Dimming Minimum On-Time | 500 ns - enables precise 1 % dimming duty cycle at 20 kHz without pulse distortion. |
| Switching Frequency Range | 250 kHz to 1 MHz - adjustable via FSW pin resistor; supports EMI optimization and external sync for multi-device coherence. |
| Integrated MOSFET RDS(on) | 280 mΩ (typ.) - reduces external component count and conduction loss in boost power stage. |
| OVP Threshold Accuracy | 1.190–1.280 V reference at OVSEL - allows precise overvoltage protection setting with external resistor divider. |
Pinout & Package
LED7706 is housed in a VFQFPN-24 4×4 mm thermally enhanced package with exposed pad for PCB-level heat dissipation. Pin functions are validated per STMicroelectronics datasheet Rev 2 (April 2009), Table 2 and Figure 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ROW1–ROW6 | Current sink outputs | Each drives one LED string; supports floating (disabled) rows and fault detection. |
| VIN | Main power input | Supplies both boost stage and internal LDO; accepts 4.5–36 V unregulated DC. |
| LX | Switching node | Drain of internal MOSFET; connects to boost inductor and flywheel diode anode. |
| PGND / SGND | Power / signal ground | Separate return paths minimize noise coupling between high-current and analog sections. |
| RILIM | Row current programming | Resistor-to-SGND sets all six channel currents (e.g., 51 kΩ → 30 mA). |
| FAULT | Fault indicator | Open-drain output pulled low on open/short LED, thermal shutdown, or OVP event. |
| DIM | PWM brightness control | Accepts 0–5 V logic-level PWM signal; supports 20 kHz switching with 500 ns min on-time. |
| EN | Enable input | Active-high; 1.6 V turn-on threshold; internal 2.5 µA pull-up enables simple power-up sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated +5 V LDO (LDO5) | Supplies internal analog circuitry and MOSFET gate driver; delivers up to 40 mA with 120 mV dropout at 10 mA. |
| Programmable soft-start (SS) | External capacitor sets ramp time; 5 µA charge current prevents inrush and enables floating-row detection during startup. |
| LED fault detection | Hardware-based open/short identification per row; FAULT pin asserts within microseconds of failure. |
| Ceramic-capacitor stable | No electrolytic capacitors required on boost output; compatible with low-ESR MLCCs for compact, long-life designs. |
| Thermal shutdown | Turns off all sections at 150 °C junction temperature with 30 °C hysteresis for reliable recovery. |
Applications
| LCD Monitor Backlight | TV Panel Backlight |
|---|---|
Use Scenario: Driving 6 parallel LED strings behind 15–24 inch LCD monitors with dynamic brightness control. IC Role / Device Role / Timing Role: Primary LED current controller and boost regulator; manages PWM dimming timing, fault reporting, and rail voltage regulation. Use Value: ±2 % current matching eliminates visible brightness gradients; 500 ns min on-time preserves dimming linearity at low brightness levels. | Use Scenario: Powering edge-lit LED arrays in 32–55 inch consumer TV panels requiring high reliability and thermal resilience. IC Role / Device Role / Timing Role: Integrated power management unit handling both DC-DC conversion and per-string current regulation with synchronized fault response. Use Value: Internal 280 mΩ MOSFET reduces BOM cost and board area; VFQFPN-24 package enables efficient heatsinking under continuous 30 mA/channel load. |
| PDA Display Backlight | GPS Navigation Display |
Use Scenario: Compact backlight solution for handheld PDAs with limited PCB real estate and battery-powered operation. IC Role / Device Role / Timing Role: Single-chip LED driver with ultra-low quiescent current (20 µA shutdown) and programmable light-load efficiency mode. Use Value: Pulse-skip mode extends battery life; 4.5 V minimum input supports single-cell Li-ion (3.0–4.2 V) with boost pre-regulator. | Use Scenario: Automotive-grade display backlight for GPS units operating in harsh thermal environments (-40 °C to +85 °C). IC Role / Device Role / Timing Role: Robust LED driver with thermal shutdown, OVP, and open/short LED detection for fail-safe operation. Use Value: 150 °C thermal shutdown and -40 °C to +150 °C junction rating ensure reliability in under-dash mounting conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61165DRVR | Single-channel, 40 V boost with I²C dimming; no integrated fault detection or multi-row current matching. | Requires external current sinks and fault logic for 6-row designs; suited for simpler, lower-channel-count systems. | Select when I²C interface and programmable registers outweigh need for integrated row control and hardware fault reporting. |
| MAX16820ATP+ | 6-channel linear LED driver (no boost); max 36 V input but only 17 V output; higher thermal dissipation. | Not suitable for high-VF LED strings; requires external boost stage for >17 V loads; lacks OVP and short-circuit detection. | Choose only for low-output-voltage (<17 V), low-power applications where boost efficiency is secondary to simplicity. |
Compared with TPS61165DRVR and MAX16820ATP+, the LED7706 uniquely integrates boost regulation, six matched current sinks, and hardware-based open/short LED fault detection in one VFQFPN-24 package - eliminating external components and reducing system-level validation effort for multi-row LCD backlight designs.
Availability
LED7706 is available at Aetrix Electronics and suitable for LCD monitor backlighting, TV panel backlighting, and GPS navigation display applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LED7706 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 LED7706 belongs to ST's LED backlight driver product line, engineered specifically for high-efficiency, multi-string LCD panel illumination with integrated fault safety and thermal robustness in compact form factors.
FAQ
What is the maximum number of white LEDs supported per row by the LED7706?
The LED7706 supports up to 10 white LEDs per row, based on its 36 V maximum boost output voltage and typical 3.6 V forward voltage per LED. This assumes nominal VF and thermal derating; actual count depends on LED VF distribution, ambient temperature, and layout parasitics.
How does the LED7706 detect open-circuit LED faults?
The LED7706 detects open-circuit LEDs using its MODE pin configuration: when MODE is tied to SGND, the device monitors row voltage drops and triggers FAULT assertion if any row voltage exceeds 3.4 V - indicating loss of current path. This occurs within microseconds and disables affected rows while maintaining others.
Can the LED7706 operate without an external inductor?
No - the LED7706 requires an external boost inductor connected between VIN and LX pins. The internal MOSFET and current-mode controller depend on this inductor for energy transfer; omitting it prevents regulation and risks device damage due to uncontrolled current flow.
What is the purpose of the SLOPE pin, and how is it configured?
The SLOPE pin accepts a resistor from LX to inject slope compensation into the current-sense path, preventing subharmonic oscillation in peak current-mode control. ST recommends a 680 kΩ resistor for standard 12 V input operation; value scales inversely with input voltage to maintain stability across the 4.5–36 V range.
EVALED7706 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Packaging:
- Box
- Product Status:
- Obsolete
- Current - Output / Channel:
- 30mA
- Outputs and Type:
- 6 Non-Isolated Outputs
- Voltage - Output:
- 36V
- Features:
- Dimmable
- Voltage - Input:
- 4.5V ~ 36V
- Contents:
- Board(s)
- Utilized IC / Part:
- LED7706
EVALED7706 FAQ
1.How can I place an order for EVALED7706 through Aetrix?
Please submit a Request for Quotation (RFQ) for EVALED7706 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 EVALED7706 reliable?
The price and inventory of EVALED7706 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EVALED7706 is usually 5 days.
3.What payment methods are accepted for EVALED7706?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EVALED7706 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EVALED7706?
EVALED7706 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EVALED7706 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 EVALED7706?
For technical support, including EVALED7706 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EVALED7706 requirements.
6.How does Aetrix verify that EVALED7706 is sourced from the original manufacturer or authorized distributors?
All EVALED7706 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 EVALED7706 meets industry standards.
7.What is the process for return or replacement of EVALED7706?
All EVALED7706 units undergo pre-shipment inspection (PSI). If there is an issue with EVALED7706, 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 EVALED7706 part is unused and in its original packaging.
Return procedure for EVALED7706:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
EVALED7706 Tags
-
COM-13716
SparkFun Electronics
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B-G474E-DPOW1
STMicroelectronics
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EVB81116-A2
Melexis Technologies NV
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EVB81116-A3
Melexis Technologies NV
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LP5036EVM
Texas Instruments
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LP5813-12WCSPEVM
Texas Instruments
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LP8863EVM
Texas Instruments
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1455
Adafruit Industries LLC
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1427
Adafruit Industries LLC
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WIG-13279
SparkFun Electronics
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5650
Adafruit Industries LLC
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1429
Adafruit Industries LLC
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