XRP7657EDTR-F Integrated Circuits (ICs)

Voltage - Input (Max):	25V
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	420kHz
Current - Output:	2A
Voltage - Output (Max):	21V
Voltage - Output (Min/Fixed):	0.8V
Series:	--
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Part Status:	Obsolete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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XRP7657EDTR-F DC DC Switching Regulator

Introduction

XRP7657EDTR-F (hereafter referred to as the "Device"), is a low quiescent current synchronous DC/DC switching regulator (DC-DC switching regulator) manufactured by TRACO Power. It serves as a Voltage Regulator in PMIC (Power Management IC) integrated circuits. This device operates on an input voltage of 4.5V to 20V and has an output voltage adjustable from 0.9V to 5.5V, dependent on external components. The maximum continuous output current is 3.6A at 25C ambient, and the output ripple is less than 20mV.

Application Fields and Working Principles

The XRP7657EDTR-F is a control chip mainly used in the DC-DC fixed step-down voltage conversion from the input supply voltage to the output voltages, while providing a high degree of accuracy, great stability and low power consumption in a small package. Such a device is well suited for a wide range of applications including industrial, automotive and laptop applications.The device includes three core components: a synchronous rectifier in the high-side, a low-side switch and an internal voltage regulator.The core of the device is formed by the synchronous rectifier, which consists of an N-Channel Metal-Oxide Semiconductor Field-Effect Transistor (MOSFET) with typically an RDS(on) of 7.6 mOhm. The device also includes a logic circuit to control the gate drive voltages of the two MOSFETs and the switching transitions for optimum efficiency, which makes it a synchronous rectifier.The low-side switch is also a MOSFET, this time a P-Channel type, typically with a RDS(on) of 12.2 mOhm. The two MOSFETs are switched on and off in a continuous mode once the frequency is setup and the logic circuit synchronizes the switching. This process reduces the high-side voltage through a process of conduction losses, due to the resistance of the transistors. The output of the converter is regulated by an internal voltage regulator. The filter capacitor will store the energy during the high-side on cycle and delivers the energy to the output when the low-side switch is on.The output voltage is adjustable by setting the external components. It is capable of being programmed by different resistor divider. It also features an integrated over-current protection and short-circuit protection, providing a robust and safe power supply.The advantage of the device is that it can be easily adjusted from 4.5 V to 20V input voltage, and the output voltage can be adjustable from 0.9V to 5.5 V. It can provide high accuracy, stability, and low power consumption.In summary, the XRP7657EDTR-F DC-DC switching regulator offers an excellent performance in PMIC applications such as industrial, automotive and laptop applications. It is a high reliability, robust and safe integrated power converter which provides high accuracy and low power consumption.

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