APX803L05-28SA-7

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Pulse width modulation (PWM) is a widely accepted, nearly ubiquitous form of regulation through which a power controller can, with relative ease, control a wide range of electrical components and provide a wide range of Digital Power functions, including DC/DC and AC/DC converter classes. Maxim Integrated’s APX803L05-28SA-7 is an example of such a solution, a PWM, in an ultra-compact, industrial grade, 28-Pin 3mm × 3mm QFN package.

APX803L05-28SA-7 Application Field

The APX803L05-28SA-7 PMIC - Supervisor is an advanced low-power regulator, ideal for applications reliability, power and performance requirements. With very low quiescent current, of 0.8-microamperes during operation, it presents an advanced feature set with status monitoring, multiple current and time-based regulators, and a range of specialized accessories. The APX803L05-28SA-7 is particularly well-suited for wireless applications, such as Zigbee, BLE 4.0, and Wi-Fi, and provides power regulation for the system, allowing for extremely fine resolution between battery and host processor.

Specifically, the APX803L05-28SA-7 is a low- quiescent current, high-efficiency, 5A voltage regulator that is ideal for supplying the host processor with a high level of power, while maintaining an extremely low quiescent current of 0.8-microamperes. The APX803L05-28SA-7 boasts a low dropout voltage of 0.5V and a programmable soft start (precise start voltages and charging times keeping) mode to protect the host and voltage source from excessive inrush. These features make the APX803L05-28SA-7 PMIC the ideal choice for automotive, industrial, and medical applications.

Working Principle of APX803L05-28SA-7

The APX803L05-28SA-7 PMIC is based on pulse-width modulation (PWM) technique. This technique is used to regulate the input voltage to the output devices, such as displays, battery charging, voltage feedback systems, in order to maintain high power efficiency while preventing power loss. The APX803L05-28SA-7 is composed of two main components: the PWM controller and the power switches. At its core, the PWM controller controls the switching operation of the power switches, where the on/off state of the switches is determined by a voltage-based error signal generated by the controller.

The APX803L05-28SA-7 PWM architecture is designed with a system reset, programmable time-base and peak current limit. The system reset is an automotive-grade watchdog timer, which automatically puts the APX803L05-28SA-7 into a safe state in case of abnormal current consumption or abnormal temperature. The programmable time-base allows for precise control over the power supply response time and helps reduce overall power consumption. The peak current limit helps to prevent excessive current consumption and thus optimizes overall system power consumption. The power switches in this PMIC are controlled by an internal clock signal and the computed voltage-based error signal.

The APX803L05-28SA-7 also has two proprietary features: switchmode-rotation-counter and short-circuit-counter. The switchmode-rotation-counter ensures that all the power switches in the APX803L05-28SA-7 cycle regularly even if the input power supply to the PMIC is not synchronous. The short-circuit-counter helps to protect the PMIC against short-circuit and excessive current consumption. This critical safety feature helps to reduce the risk of system failure.

Overall, the APX803L05-28SA-7 is an advanced low-power, high-efficiency voltage regulator with a wide range of features and a high level of system protection. Its use of advanced power control techniques, such as PWM, switching modes and switchmode-rotation-counter, make it an ideal choice for demanding applications.

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