Inx In518 Ic Pinout Diagram ((hot)) Jun 2026

Would you like a side-by-side comparison of how to map IN518 pins to a known TI TPS65150?

High-accuracy analog voltage rail (typically outputs ~17V) supplying the display's source drivers. FUSE / ENABLE

| Pin | Name | Function Description | | :--- | :--- | :--- | | 1 | VCC | : Provides the main input voltage for the chip, typically 12V from the T-CON board. | | 2 | GND | Ground : The common ground reference for the chip and all its generated outputs. | | 3, 4 | AGND | Analog Ground : Dedicated ground pins for the chip's sensitive internal analog circuitry, separate from noisy digital grounds for better stability. | | 5, 6 | EN | Enable : Receives an enable signal (often from the timing controller like IN2812A or a power-on sequence control chip) to activate the IN518 and start all its voltage outputs. | | 7, 8 | LX1, LX2 | Switching Node : Connected to the internal power MOSFET switch and the external inductor. These are the primary output pins for the boost converter, generating VAA (typically +17.9V for source driver ICs). | | 9, 10 | FB1, FB2 | Feedback : Senses the output voltage and provides a feedback signal to the chip's internal error amplifier for precise voltage regulation. | | 11, 12 | COMP | Compensation : Connected to an external RC network (resistor and capacitor) for stabilizing the chip's internal control loop, ensuring stable operation. | | 13, 14 | VGL | Negative Gate Voltage : An important output that provides the negative gate-off voltage for the LCD panel's TFT transistors, typically around -8V to -12V. | | 15, 16 | VGH | Positive Gate Voltage : Provides the high positive gate-on voltage necessary to activate the TFT's switching, typically ranging from +25V to +30V. | | 17, 18 | VGH_ON | Gate On Drive : Pins dedicated to generating the controlled high-voltage on-drive signal for the gate driver ICs. | | 19 | AVDD_VAA | Analog Power Supply : Provides the core voltage for analog circuitry in the source driver ICs and gamma reference buffer, typically around 15V-18V. | | 20, 21 | VCOM | Common Voltage : Generates the stable reference voltage for the liquid crystal layer, typically around 7.3V, requiring high precision for consistent image quality. | | 22, 23 | VDD | Digital Logic Supply : Provides a lower voltage (e.g., 3.3V) for the T-CON board's digital logic circuits, processors, and memory chips. | | 24 | PWR_OK | Power Good : A logic output signal that goes high (e.g., 3.3V) to indicate that all power supply rails are within their nominal operating ranges. | | 25, 26 | SS | Soft-Start : Connected to an external capacitor to control the soft-start time, which limits inrush current during startup for smooth power-up. | | 27, 28 | ISENSE | Current Sense : Monitors the current through the external power path to the LCD panel for overcurrent protection. | | 29-31 | NC | No Connect : Unused pins with no internal connection. | | 32-34 | VIN | Input Voltage : Additional input voltage pins connected in parallel with Pin 1 (VCC) for improved power distribution and current handling. | | 35-37 | LX3, LX4, LX5 | Switching Node : Additional switching nodes (like LX1 & LX2) used for generating other necessary voltages (e.g., VGL, VGH, VDD). | | 38-40 | BST | Bootstrap : Connected to external bootstrap capacitors (typically C0402 or C0603) that provide the necessary voltage to drive the high-side internal MOSFETs. |

Check the Schottky diode connected to Pin 7 (SW). If the diode is leaky or shorted, the IN518 will draw excessive current and heat up rapidly. Conclusion Inx In518 Ic Pinout Diagram

Monitors the output voltage or current, sending data back to the internal controller to maintain regulation.

Designing a circuit requires adhering to the absolute maximum ratings and operating conditions of the IC.

If you are troubleshooting a blank screen, vertical lines, or power issues, understanding the IN518’s pinout is critical. Would you like a side-by-side comparison of how

The IN518 is typically housed in a small-form-factor package, such as an or MSOP-8 . It functions primarily as a DC-DC step-up (boost) converter designed to provide the high voltage necessary to drive LED backlights from a low-voltage input source. IN518 Pinout Diagram Configuration

Fix: Measure the voltage directly at Pin 5 (EN). If it is floating or drops below the logical threshold voltage (usually under 0.4V), the chip will remain entirely disabled.

_______ NC 1 -| |- 8 Vcc (+) -| |- IN 1 2 -| IN518 |- 7 OUT 4 -| |- IN 2 3 -| |- 6 OUT 3 -| |- GND 4 -|_______|- 5 OUT 2 | | 2 | GND | Ground :

Turn on the TV while keeping your multimeter probe firmly pressed onto the or AVDD test point. Watch the meter during the initial brief boot sequence:

Output voltage sense or direct low-dropout regulation terminal depending on the exact chip sub-variant. 3. How the IN518 Operates: Internal Architecture

The IN518 can be purchased from major electronic component distributors. Because it is a programmable chip, sourcing is usually done by :

Closed-loop precision sense pins tied to R-C voltage divider networks (like elements) to regulate output targets safely. Precision Reference Exposed Pad PGND / AGND

(also identified as ) is a specialized DC-to-DC converter IC primarily used in LCD display panels