Inx In518 Ic Pinout Diagram Top Review

The INX IN518 (also identified as 1N518) is a multi-channel DC-to-DC converter IC primarily used in Innolux LCD TV T-CON boards and panel display modules. It typically comes in a QFN-40 (Quad Flat No-lead) surface-mount package. Pinout Configuration (Top View)

Part 6: Common Problems and Troubleshooting

| Symptom | Likely Cause | Solution | | :--- | :--- | :--- | | No output voltage | EN pin floating or low | Pull EN to VIN via a 100k resistor | | Output voltage is low (e.g., 1.2V) | Output shorted or overcurrent | Check load resistance; measure OUT to GND | | Output is noisy/oscillating | Missing bypass cap on pin 4 | Add 10nF – 100nF from pin 4 to GND | | IC overheats | Excessive dropout voltage or load | Reduce VIN - VOUT differential; add heatsink | | Wrong output voltage | Misidentified top marking | Measure with DMM; compare to expected suffix | inx in518 ic pinout diagram top

– Feedback pin; used to set or monitor the output voltage. Pin 5: LX / SW – Switching output; connects to the external inductor. Pin 6: BST / VCC The INX IN518 (also identified as 1N518 )

Industrial Panels: Used in low-resolution industrial control panels where size and cost are critical. Medical Equipment: Found in portable medical monitors. "1N" Prefix: This designation is universally used for

Avoid Substitutions: Do not replace the IN518 with standard comparator ICs like the LM339; although they may share a similar footprint, their internal circuitry is fundamentally different.

• "1N" Prefix: This designation is universally used for diodes and rectifiers.
• "IC" Prefix: This usually refers to Integrated Circuits (e.g., the 74LS series or 555 timers), which contain complex internal circuitry.

Pin 6 (NC / Multi-function): Often labeled as "No Connection" or used for specialized startup/sensing functions depending on the specific manufacturer's implementation. Technical Resources

When substituting, always check the Peak Inverse Voltage (PIV) and Current rating. As long as the replacement diode has equal or higher ratings and fits the through-hole spacing (standard 0.1" to 0.3" spacing), the pinout remains identical (Band = Cathode).