| Pin(s) | Name | Typical Role | |--------|-------------|---------------------------------------------------| | 1 | VIN | Main DC input (e.g., 5V, 12V, or 3.3V) | | 2 | EN | Enable pin (active high) | | 3 | POK | Power OK flag (open-drain) | | 4 | VREF_IN | External reference voltage input | | 5 | FB_AVDD | Feedback for AVDD boost converter | | 6 | FB_VCOM | Feedback for VCOM amplifier | | 7,13 | GND_xxx | Ground (separate power/logic) | | 8 | SW_AVDD | Switching node for boost converter (inductor pin) | | 9 | LXD_VGH | Level-shifted gate-high control | | 10 | LXD_VGL | Level-shifted gate-low control | | 11 | CLK_IN | Clock input for timing/charge pump | | 12 | SD_IN | Shutdown input (active low) | | 14 | SCL | I2C clock (optional configuration) | | 16 | SDA | I2C data | | 25 | VGH_OUT | Gate-on voltage (typically +25V to +30V) | | 24 | VGL_OUT | Gate-off voltage (typically -5V to -10V) | | 26 | AVDD_OUT | Analog supply for source drivers (~8V-13V) | | 23 | VCOM_OUT | Common electrode voltage (~6V-8V, adjustable) | | 22-18 | Gamma_Refx | Gamma correction reference voltages |
In this detailed guide, we will break down everything you need to know about the Inx In518 IC, including its internal architecture, complete pinout diagram, electrical characteristics, common applications, and frequently asked questions.
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. Place it immediately adjacent to Pin 2 (VIN) and Pin 4 (GND) to minimize high-frequency switching loops. Typically ranges from
| Pin Number | Pin Name | Description | |------------|----------|------------------------------------------------| | 1 | OUT1 | Output of operational amplifier A | | 2 | IN1- | Inverting input of amplifier A | | 3 | IN1+ | Non-inverting input of amplifier A | | 4 | GND (V-) | Negative power supply or ground (single supply)| | 5 | IN2+ | Non-inverting input of amplifier B | | 6 | IN2- | Inverting input of amplifier B | | 7 | OUT2 | Output of operational amplifier B | | 8 | V+ | Positive power supply | | Pin(s) | Name | Typical Role |
When the EN pin is high, the internal oscillator activates. The high-side MOSFET turns on, allowing current to flow from VIN through the SW pin to the external inductor. The high-side switch turns off, and the synchronous low-side MOSFET turns on to ground the inductor current during the off-cycle.
For a long time, detailed information like the official and pinout diagram remained scarce. A popular question in repair forums is, "Does a pinout or datasheet for the IN518 exist in nature?" and the common answer has often been "No." Place it immediately adjacent to Pin 2 (VIN)
| Pin Identifier | Marking | Function | Description | | :--- | :--- | :--- | :--- | | | Band (Stripe) | Cathode | The negative terminal. Current flows out here. Identified by a black or colored band painted on the glass body. | | 2 | No Band | Anode | The positive terminal. Current flows in here. Connected to the P-type semiconductor material. |
The IN518 is a synchronous boost converter designed specifically to drive white LEDs, often acting as a substitute for chips like the AAT1176B, TPS65130, or APW8713. It typically operates from a single Lithium-ion cell (2.7V–5.5V), making it ideal for portable, battery-powered devices.