AP65403SP-13

Voltage - Output (Min/Fixed):	2.5V
Base Part Number:	AP65403
Supplier Device Package:	8-SO-EP
Package / Case:	8-SOIC (0.154", 3.90mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	750kHz
Current - Output:	4A
Voltage - Output (Max):	12V
Series:	--
Voltage - Input (Max):	17V
Voltage - Input (Min):	4.75V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

PMIC (Power Management ICs) are integrated circuits that handle many power management functions for a given system. Voltage regulators are a subset of this type of chip, used to help regulate and monitor output voltages and current. DC DC Switching Regulators are a specific type of voltage regulator designed to efficiently step down higher inputs to generate a desired output voltage. The DC-DC switching regulators offer excellent efficiency, as well as capabilities for current or voltage boost, as well as step-down converters. The AP65403SP-13 is an ideal DC-DC switching regulator for many applications, as it is designed to quickly respond to load changes and provide optimal efficiency.

AP65403SP-13 Features

The AP65403SP-13 is a switching regulator with an input voltage range of 4.5V to 28V, and an output voltage range of 1.2V to 17V. It is a synchronous buck converter featuring advanced control algorithm and soft start function, providing excellent load and line transient performance, as well as fast transient response. It supports over-current, over-temperature, and over voltage protections, as well as a selectable OCP latch mode. The switching frequency is adjustable from 300kHz to 2MHz, and the switch current limit is adjustable from 1.05A to 10A.

AP65403SP-13 Application Fields

The AP65403SP-13 is ideal for applications requiring a fast response and excellent efficiency. These applications may include point-of-load (POL) DC/DCs,ASICs,DSP, FPGA, LIN/CAN/CANFD, load switch, automotive DC/DC converters, LED drivers, medical and consumer electronics.

AP65403SP-13 Working Principle

The AP65403SP-13 is designed to provide accurate and efficient DC/DC conversion. The internal circuitry of the regulator consists of a switch node driving circuit, a high-precision voltage reference, a control loop, and a power switch. A PWM (pulse width modulation) signal is generated in the switch node driving circuit based on the output of the error amplifier and regulates the current through the power switch. The internal clock oscillator determines the switching frequency and allows up to 2MHz of switching frequency. The current through the power switch is monitored by the current sense circuit, and when it exceeds the set current limit, the switching operation is inhibited. The current ramp adaption circuit ensures fast and accurate output voltage and response to load changes by automatically adjusting the current ramp slope, and the output voltage is stabilized by the control loop.

Conclusion

The AP65403SP-13 is a DC-DC switching regulator that is designed to provide a high-efficiency and fast response to the load changes. It offers an adjustable switching frequency and switch current limit, over-current, over-temperature and over-voltage protection, and is ideal for many applications requiring fast and accurate DC/DC conversion.

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