MAX5019CSA+T

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The MAX5019CSA+T is a Sub-Micropower DC-DC step-up switching regulator controller whose features and performance define a new generation of high efficiency, compact DC-DC switching regulators. With its unique sub-microamp shutdown mode, a wide 4V – 35V input voltage range, and a supply current of only 160µA, the MAX5019CSA+T allows system designers to meet the increasingly stringent demands of mobile applications such as PDAs, smartphones, portable medical equipment, automotive, portable instrumentation and communication keys.

The MAX5019CSA+T is specifically designed to drive n-channel MOSFETs with high switching speeds and much lower conduction losses. This switching regulator controller offers ultra-low standby power, no external loop compensation required and integrates a transistor for boosting the gate drive voltage. All of these features combine to provide a highly integrated solution for maximizing system efficiency and minimizing solution size.

The controller contains one voltage regulator and one p-channel MOSFET that can be configured for either boost or buck topologies. The maximum output current is determined by the external components used in the circuit, so it can be adjusted to the required level for a particular application. The internal circuitry of the controller drives the switch at an optimal frequency and duty cycle to provide accurate output voltage regulation without requiring external loop compensation. Additionally, the high frequency operation of the MAX5019CSA+T minimizes the size of the external components, such as inductors and capacitors, making it a suitable choice for portable or space-limited applications.

For a boost application, the input voltage can be regulated as low as 4V, while the maximum switching frequency is 2.2MHz. The device carries current limiting circuits and an under-voltage lockout (UVLO) on the drain to prevent damage caused by excessive current or insufficient input voltage. The MAX5019CSA+T also has a power-good output that indicates when the output voltage is ready for use.

For a buck-boost application, the device’s maximum switching frequency is 3.3MHz, and the step-up ratio is internally synchronized to the clock. The controller detects when the input voltage exceeds the set voltage and immediately enables the p-channel MOSFET to start the low-side current sink. This feature helps to protect the system from short-circuit and reversed polarity conditions in addition to improving the system’s efficiency.

The MAX5019CSA+T is ideal for a wide variety of portable and mobile applications due to its low power consumption and highly integrated solution. It works with both linear and switching power supplies, making it a versatile and cost effective option for powering portable or space-limited devices. It uses a uniquely optimized topology to provide the highest efficiency without requiring external compensation, making it an ideal choice for high efficiency applications.

In conclusion, the MAX5019CSA+T is a highly integrated step-up switching regulator controller that is specifically well-suited for portable and mobile applications due to its small size, high efficiency, and low power consumption. It supports both boost and buck-boost topology and is capable of driving an n-channel MOSFET at an optimal frequency with no external loop compensation required. Its features make it an ideal choice for maximizing system efficiency while minimizing solution size and cost.

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