IR3895MTR1PBF Integrated Circuits (ICs)

Voltage - Output (Min/Fixed):	0.5V
Base Part Number:	IR3895
Supplier Device Package:	16-PowerQFN
Package / Case:	16-PowerVQFN
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	300kHz ~ 1.5MHz
Current - Output:	16A
Voltage - Output (Max):	18.06V
Series:	SupIRBuck®
Voltage - Input (Max):	21V
Voltage - Input (Min):	1V
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Part Status:	Obsolete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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IR3895MTR1PBF Application Field and Working Principle

IR3895MTR1PBF is a highly efficient, ultra-low quiescent current, 24V to 6V, minimum 4A step-down switching regulator. It belongs to the DC-DC switching regulators, which are developed to provide working power to ICs, LEDs, microcontrollers, and other IoT products. Thanks to its innovative design and technology, IR3895MTR1PBF can provide adjustable output with up to 5.5V for different applications.

Applications

IR3895MTR1PBF is widely used in industrial, automotive, computing, communications, storage, and consumer applications. With its ultra-low quiescent current, it is ideal for battery-powered applications, extending the battery life and reducing operational cost. It can be used to power mobile devices and consumer electronics, such as digital cameras, MP3 players, and portable DVD players. Also, it is utilized to provide power for low-power embedded systems such as portable medical devices, home automation systems, and test and measurement instruments.

Features

IR3895MTR1PBF features an 1 MHz typical switching frequency, an external sense pin for improved current accuracy, and an adjustable undervoltage lockout (UVLO). It also boasts an internally fixed soft start ramp, which helps in providing a smooth output voltage transition, reducing system stress and improving overall efficiency. In addition, it includes an adjustable frequency range from 300 KHz to 1.4 MHz, enabling engineers to customize the device for a wide range of applications to optimize output performance. With its integrated circuit over-temperature protection (OTP), it ensures reliable operation by reducing and limiting the operating frequency when the device temperature reaches a predetermined threshold.

Working Principle

IR3895MTR1PBF is based on discontinuous conduction mode (DCM) topology. It utilizes an internal low-side synchronous MOSFET to switch the input supply, followed by a synchronous rectifier to maximize inductor utilization. The output voltage is regulated by comparing the feedback voltage to the internal reference voltage. It begins with the voltage being applied to the input pin. Then, the switch is turned on and current begins to ramp up in the inductor. When the inductor current reaches the current limit threshold, the switch is turned off. Then, the energy stored in the inductor is released to the output capacitor and the output voltage is regulated to the desired level. This cycle is repeated over and over again to maintain the desired output voltage.

Conclusion

IR3895MTR1PBF is a highly efficient and cost-effective device, recognized as the standard for DC-DC switching regulators. With its wide application field and working principle, it can provide adjustable output voltage with ultra-low quiescent current, to enable engineers to design applications with the highest performance, while extending battery life and reducing operational cost.

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