AP1507-33D5L-U

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AP1507-33D5L-U Voltage Regulator

AP1507-33D5L-U is a monolithic DC-DC switching regulator from Diodes Incorporated. This voltage regulator belongs to DC DC Switching Regulators category in PMIC (power management IC). AP1507-33D5L-U is designed to provide regulated output voltage with a maximum load current of 5A. It guarantees sufficient current capability for applications like cell phones and personal digital assistants.

AP1507-33D5L-U incorporates the fixed frequency Pulse Width Modulation (PWM) control, allowing the device to have a fast transient response time. Its soft start and current limit functions restrain inrush current during start-up. The modular nature of the design allows the user to easily customize the components to obtain the desired output voltage. The device also withstands over-temperature protection, open-loop protection and low input voltage protection.

AP1507-33D5L-U application field could be classified into two main parts:

1. Cell Phones and Personal Digital Assistants

AP1507-33D5L-U with its maximum load current of 5A and the fast transient response time make this voltage regulator a suitable candidate for applications like cell phones and personal digital assistants.

Modern day cell phones require high degree of power management capabilities in order to deliver interactive functions like streaming videos, playing online games, etc. Similarly, personal digital assistants require ample power to protect its sensitive information. Thus, AP1507-33D5L-U provides a reliable solution for cell phones and personal digital assistants applications.

2. Automotive

AP1507-33D5L-U voltage regulator is also ideal for automotive applications that might require robust protection features. It has features like over-temperature protection, open-loop protection and low input voltage protection that make it suitable for different types of automotive applications.

In addition, AP1507-33D5L-U may also be deployed in other applications such as industrial, communication, and consumer electronics that require reliable power supply.

Working Principle

AP1507-33D5L-U consists of current-mode PWM controller, an internal MOSFET with over temperature protection, OVP and over current protection (OCP). To ensure the correct operation of the voltage regulator, the output voltage is controlled by varying the on-time or off-time of the internal MOSFET. Oscillator frequency of the device is internally fixed at approximately 600 kHz.

During the normal operation, the voltage regulator will enter into continuous conduction mode (CCM) to keep the output voltage in regulation as much as possible. When the current in output inductor reaches the peak value (Ipk) set by external resistor, the voltage regulator will enter into a discontinuous conduction mode (DCM). During this process, the voltage regulation is no longer possible and the output voltage will decrease with the load current increase.

AP1507-33D5L-U also includes a current limit circuit to work as the over-current protection (OCP). When erroneous currents are detected during normal operation, the OCP circuit will reset the front stage MOSFET and thus, protect the circuit from damage.

In short,AP1507-33D5L-U voltage regulator offers a simple and efficient solution to regulate output voltage with fast transient response time and wide load current range.

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