### Overview of the LM3495MTC The **LM3495MTC** is a high-performance, voltage-mode PWM (Pulse Width Modulation) buck controller. It is designed to drive N-channel MOSFETs in step-down converter applications where high efficiency and precision are required. --- ### Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Input Voltage Range** | 2.9V to 18V | | **Output Voltage Range** | 0.6V to 5.5V | | **Switching Frequency** | 200 kHz to 1.5 MHz (Adjustable) | | **Feedback Voltage Reference** | 0.6V (±1% accuracy) | | **Package Type** | TSSOP-16 | | **Control Method** | Voltage Mode Control | --- ### Internal Electronic Blocks The LM3495 consists of several critical functional sub-circuits that manage power conversion: 1. **Hiccup Mode Current Limit:** * This protects the device during over-load or short-circuit conditions. Instead of shutting down permanently, it "hiccups" or retries periodically to minimize heat dissipation. 2. **Adaptive Gate Drivers:** * The IC includes powerful drivers for external High-side and Low-side N-channel MOSFETs. It features "adaptive dead-time" control to prevent shoot-through (both MOSFETs being on at the same time). 3. **Soft-Start & Tracking:** * The `SS/TRACK` pin allows the output voltage to ramp up slowly, reducing inrush current. It can also be used to make the output track another voltage rail. 4. **Frequency Oscillator:** * The switching frequency is set by an external resistor at the `RT` pin. Higher frequencies allow for smaller inductors/capacitors, while lower frequencies improve efficiency. --- ### Pin Configuration Summary | Pin Name | Function | | :--- | :--- | | **VIN** | Input supply voltage for the internal bias. | | **HG / LG** | High-gate and Low-gate outputs to drive external MOSFETs. | | **FB** | Feedback pin connected to the output voltage divider. | | **COMP** | Output of the error amplifier for loop compensation. | | **PGOOD** | Power Good indicator (Open-drain). | | **EN** | Enable pin to turn the controller on or off. | --- ### Typical Application Circuit Example To utilize the LM3495, external components are required to complete the "Buck" topology. ```markdown [Input Rail] --> [LM3495 Controller] | +--------+--------+ | | [High-Side FET] [Low-Side FET] | | +----[Inductor]---+----[Output V] | [Filter Capacitor] ``` ---