LM3495MTCX/NOPB

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LM3495MTCX/NOPB is a switching regulator controller from Texas Instruments’ with the industry standard features. While the controller features an internal high-side current limit and soft-start, it is intended for high voltage applications and is capable of supporting synchronous, non-synchronous, and constant on-time (COT) architecture as well.

The LM3495MTCX/NOPB voltage regulator controller can be used in various digital power applications, such as LED lighting power supplies, telecommunications power systems, LCD monitor and televisions power systems, distributed power systems, and industrial, instrumentation and medical equipment power systems. The controller can also be used in a wide variety of other applications that require excellent voltage regulation, including servers and workstations, notebooks, automotive, automotive access power and solar power conversion.

The LM3495MTCX/NOPB operating voltage ranges from 10V to 55V. It has an adjustable operating frequency from 50KHz to 1.1MHz and a built-in shutdown circuit. The controller also comes with a voltage feedback, power good output flag and manual reset function. The controller offers adjustable voltage options to meet a variety of load requirements.

Working Principle

The LM3495MTCX/NOPB voltage regulator controller utilizes a synchronous rectifier in a buck topology. This controller integrates two high-side MOSFETs and two low-side MOSFETs in a synchronous rectifier, reducing losses and simplifying the gate drive circuit. The synchronous rectifier configuration also reduces EMI emissions due to the lower ripple current in the inductor.

The controller features a high-side current limit up to 16A and a current sense amplifier, allowing voltage regulation in a wide range of applications. The controller also features a slew rate current limit for startup. This has the added benefit of reducing inrush current and avoiding potential output voltage drops during high current transients. The low voltage startup logic enables the device to regulate current from a very low voltage (1V) and maintains tight regulation down to 0.60V in some applications.

The LM3495MTCX/NOPB controller has a wide range of operating modes, including Shutdown Mode (SHDN), Constant Output Voltage Mode (VOUT), and Current Limit Mode (CL). The current limit mode is an important feature of this device as it helps the controller regulate the current through the load, preventing over-current conditions that could otherwise damage the load. The device also has a power good output flag that will indicate to the load whether the output voltage is above the regulation threshold.

In constant voltage mode, the device uses a voltage feedback error amplifier to control regulation, which is then adjusted to maintain the output voltage within a set regulation band. In this mode, the LM3495MTCX/NOPB uses an internal loop compensation for stability, which minimizes the external components needed for loop compensation. The controller also features soft-start, which helps to eliminate output voltage overshoots during start-up.

The device can also be used in constant on-time (COT) mode. This provides simple and efficient SYPLL control and can support different types of loops. In this mode, the device’s cycle-by-cycle current limit helps in maintaining a constant output voltage as load conditions change.

The LM3495MTCX/NOPB voltage regulator controller is an efficient and effective way to regulate voltage and current in many applications. It has a wide operating voltage range and adjustable frequency that make it well suited for a variety of digital power applications. The device is rugged, reliable, and can handle a large surge in current that might otherwise cause damage to load components.

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