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STMicroelectronics LED7706TR
- Part No.:
- LED7706TR
- Manufacturer:
- STMicroelectronics
- Category:
- LED Drivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
LED7706TR.pdf
- Description:
- IC LED DRVR RGLTR PWM 24VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:15,189
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Product details
Overview
LED7706TR from STMicroelectronics is a monolithic 6-channel LED backlight driver IC integrating a boost converter and six adjustable constant-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 - deployed in LCD monitors, TVs, and portable displays.
For engineers reviewing the LED7706TR datasheet, LED7706TR pinout, LED7706TR application, or LED7706TR equivalent, key selection criteria include its integrated 280 mΩ MOSFET, programmable soft-start via SS pin, OVP threshold set via OVSEL divider, fault detection (open/short LED), and VFQFPN-24 4×4 mm exposed-pad package compatibility with thermal management requirements.
Technical Context
The LED7706TR implements a constant-frequency peak current-mode boost controller with internal 280 mΩ power MOSFET and integrated +5 V LDO (LDO5) for analog and gate drive supply. Its dual-loop architecture regulates both boost output voltage (via minimum row voltage feedback to COMP) and per-row current (via RILIM-set gain of 987 V/A and 400 mV I-sense reference).
Fault management is hardware-based: MODE pin selects open/short LED detection thresholds (3.4 V or 6.0 V), FAULT pin asserts open-drain low on failure, and floating rows are identified during soft-start when SS voltage reaches 95 % of OVP threshold - enabling automatic row disable without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 36 V - supports automotive battery (12 V/24 V) and industrial DC rails without pre-regulation. |
| Boost Output Voltage | Up to 36 V - drives up to 10 white LEDs (3.2 V VF each) in series per row. |
| Per-Row Current | Adjustable up to 30 mA via RILIM resistor - sets current with 987 V/A gain and ±2 % matching across all six rows. |
| PWM Dimming | Min. 500 ns on-time (1 % @ 20 kHz) - enables high-resolution brightness control without visible flicker. |
| Switching Frequency | 250 kHz to 1 MHz, adjustable via FSW resistor or external sync - allows EMI optimization and multi-device synchronization. |
| OVP Threshold | Programmable via OVSEL divider; internal reference 1.234 V ±40 mV - protects LEDs and IC against overvoltage during open-circuit faults. |
| Thermal Shutdown | 150 °C turn-off with 30 °C hysteresis - prevents damage under sustained overload or poor PCB thermal design. |
Pinout & Package
LED7706TR is housed in a VFQFPN-24 4×4 mm package with exposed thermal pad (PGND-connected), optimized for high-power density and thermal dissipation in backlight modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ROW1–ROW6 | Current sink outputs | Each sinks up to 30 mA; voltage compliance up to 36 V - directly connects to cathodes of LED strings. |
| VIN | Main power input | Accepts 4.5–36 V; supplies boost stage and internal LDO - requires bulk and ceramic input capacitors. |
| LX | Switching node | Drain of internal 280 mΩ MOSFET - connects to boost inductor and flywheel diode anode. |
| PGND | Power ground | Return path for MOSFET source and high-current paths - must be low-inductance, tied to exposed pad. |
| SGND | Signal ground | Analog reference for error amp, current sense, and dimming logic - separated from PGND to minimize noise coupling. |
| DIM | PWM brightness control | Accepts 0–5 V logic-level PWM signal; 1.3 V high threshold ensures noise immunity. |
| EN | Enable input | Active-high (1.6 V threshold); pulls up internally with 2.5 µA - enables system-level power sequencing. |
| FAULT | Open-drain fault flag | Asserts low on open/short LED or thermal shutdown - drives external interrupt or status LED. |
| RILIM | Row current programming | Resistor to SGND sets current via 987 V/A gain - e.g., 33 kΩ yields ~30 mA. |
| BILIM | Boost current limit | Resistor to SGND programs MOSFET peak current - protects inductor and IC during startup/faults. |
| OVSEL | OVP divider input | Accepts resistive divider from VOUT; compares to 1.234 V reference - sets precise overvoltage trip point. |
| SS | Soft-start timing | Capacitor to SGND controls ramp-up time; 5 µA charge current defines duration - prevents inrush and overshoot. |
| COMP | Error amplifier output | Drives boost loop compensation network (RC to SGND) - stabilizes regulation against load/transient changes. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power MOSFET | 280 mΩ RDS(on) reduces external component count and conduction loss in boost stage. |
| ±2 % Row Current Matching | Ensures uniform brightness across all six LED strings without per-channel calibration. |
| Programmable OVP with 90 mV Hysteresis | Prevents false trips during transients while guaranteeing safe clamp level for LED string integrity. |
| 500 ns Minimum Dimming Pulse Width | Enables fine-grained 1 %–100 % brightness control at 20 kHz without pulse skipping artifacts. |
| Hardware-Based Fault Detection | Real-time open/short LED identification via MODE-selectable thresholds (3.4 V / 6.0 V) and FAULT pin assertion. |
Applications
| LCD Monitor Backlight | Industrial HMI Display |
|---|---|
Use Scenario: 24-inch desktop monitor with 6 parallel LED strings (10 LEDs/row) driven from 12 V supply. IC Role / Device Role / Timing Role: LED7706TR acts as integrated boost+current driver, regulating VOUT to ~32 V and sinking 25 mA per row with synchronized PWM dimming. Use Value: Eliminates need for separate boost controller and current DACs; ±2 % matching prevents visible vertical banding. | Use Scenario: Ruggedized 10-inch HMI panel in factory automation, operating from 24 V DC with wide temperature range. IC Role / Device Role / Timing Role: Provides fault-tolerant backlight drive with open-LED detection and thermal shutdown - critical for unattended operation. Use Value: FAULT pin triggers PLC alarm on LED failure; exposed pad enhances reliability at 85 °C ambient. |
| Automotive Infotainment Display | Medical Diagnostic Panel |
Use Scenario: 12.3-inch digital instrument cluster powered from vehicle battery (9–16 V), requiring EMI-controlled dimming. IC Role / Device Role / Timing Role: LED7706TR's 250–1000 kHz adjustable switching frequency avoids AM radio band; SYNC pin enables multi-display synchronization. Use Value: Reduces conducted emissions vs fixed-frequency designs; soft-start prevents ignition-system interference during cold start. | Use Scenario: High-brightness diagnostic display in imaging equipment, where consistent color temperature and zero flicker are mandatory. IC Role / Device Role / Timing Role: Delivers stable 30 mA per row with <500 ns dimming pulses at 20 kHz - meets IEC 62366 flicker safety limits. Use Value: Eliminates perceptible flicker during rapid image scrolling; ±2 % matching preserves grayscale linearity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16820ATL+ | 4-channel, no integrated MOSFET; requires external high-side switch and separate current sense. | Limited to ≤4 rows; lacks open/short LED detection and OVP programmability. | Select when lower channel count suffices and board space allows discrete boost stage. |
| TPS61165DRVR | Single-output boost LED driver with I²C interface; no multi-row current sinks or FAULT pin. | Designed for RGB backlighting with color mixing; not suitable for parallel white LED arrays. | Choose only for color-tunable backlight systems requiring digital control and thermal foldback. |
Compared with MAX16820ATL+ and TPS61165DRVR, LED7706TR uniquely integrates six matched current sinks, boost MOSFET, and hardware fault management in one VFQFPN-24 package - reducing BOM count by ≥7 components and enabling compact, robust LCD backlight designs without microcontroller intervention.
Availability
LED7706TR is available at Aetrix Electronics and suitable for LCD monitor backlighting, industrial HMI displays, automotive infotainment panels, and medical diagnostic equipment requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned thermal performance.
Supply support for LED7706TR 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, specializing in power management, analog, and automotive ICs with strong manufacturing control and automotive qualification expertise.
The LED7706TR belongs to ST's LED backlight driver product line, engineered specifically for high-reliability, multi-string LCD panel illumination in cost-sensitive and thermally constrained applications - emphasizing integration, fault resilience, and ease of layout.
FAQ
What is the maximum number of LEDs per string that LED7706TR can drive?
LED7706TR supports up to 10 white LEDs per string (row), based on its 36 V maximum boost output voltage and typical 3.2 V forward voltage per LED. Total string voltage must remain below 36 V; actual count depends on LED VF tolerance, temperature, and minimum headroom required for current regulation (400 mV across RILIM-set generator).
How does the LED7706TR detect open-circuit LED faults?
LED7706TR detects open-circuit LEDs by monitoring the voltage drop across each ROWx output during operation. When a row goes open, its voltage rises toward VOUT; the internal minimum-voltage selector identifies the lowest active row, and the FAULT pin asserts low when any row exceeds the MODE-configured threshold (3.4 V for open detection). This occurs within microseconds of fault onset.
Can LED7706TR operate without an external inductor?
No - LED7706TR requires an external boost inductor connected between VIN and LX pins. The internal MOSFET switches this inductor to generate the boosted output voltage; omitting the inductor prevents regulation and risks immediate device failure due to uncontrolled current flow through the internal switch.
Is the SS (soft-start) capacitor value specified in the datasheet?
Yes - the SS pin is charged with a nominal 5 µA current. To achieve a desired soft-start duration tSS (in seconds), use CSS = tSS × 5 µA / 2.4 V (since startup completes at ~2.4 V). For example, a 10 ms soft-start requires a 21 nF capacitor (22 nF standard value), placed between SS and SGND with short, low-inductance traces.
LED7706TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 24-VFQFN 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:
- 30mA
- Frequency:
- 250kHz ~ 1MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-VFQFPN (4x4)
LED7706TR FAQ
1.How can I place an order for LED7706TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LED7706TR 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 LED7706TR reliable?
The price and inventory of LED7706TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LED7706TR is usually 5 days.
3.What payment methods are accepted for LED7706TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LED7706TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LED7706TR?
LED7706TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LED7706TR 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 LED7706TR?
For technical support, including LED7706TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LED7706TR requirements.
6.How does Aetrix verify that LED7706TR is sourced from the original manufacturer or authorized distributors?
All LED7706TR 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 LED7706TR meets industry standards.
7.What is the process for return or replacement of LED7706TR?
All LED7706TR units undergo pre-shipment inspection (PSI). If there is an issue with LED7706TR, 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 LED7706TR part is unused and in its original packaging.
Return procedure for LED7706TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LED7706TR Tags
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