RT7257CHZSP

Voltage - Input (Max):	18V
Supplier Device Package:	8-SOP-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:	340kHz
Current - Output:	3A
Voltage - Output (Max):	15V
Voltage - Output (Min/Fixed):	0.8V
Series:	--
Voltage - Input (Min):	4.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Discontinued at Digi-Key
Packaging:	Tape & Reel (TR)

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RT7257CHZSP is one of the latest DC DC switching regulators developed by Richtek Technology Corporation. The RT7257CHZSP is designed to provide high performance with low cost and small board space, as well as a high power density. This device features an integrated high side, low side switch and two DC/DC converters in a 6-pin SOT-26 package. The RT7257CHZSP\'s internal switches can be configured to fit the desired output voltage and supports a wide input voltage range from 2.5V to 5.5V.

Application field

RT7257CHZSP can be used in a wide range of applications including portable electronics, handheld devices, embedded systems, automotive, and communication systems. Also, a variety of adjustable converters include buck, boost, BOOST-BUCK, NR(Negative-Positive Regulation) can be implemented with single IC of RT7257CHZSP.

Working Principle

The RT7257 CHZSP DC/DC converter is flexible and has a highly efficient design. It uses the advanced power modulation technique called current-mode control, which allows it to quickly and accurately regulate the output voltage. The chip is configured through an external resistor, which sets the desired output range.The chip is powered by a single internal current source, which operates with a frequency up to 800 KHz. The top MOSFET is turned on until the peak current of the inductor,is reached, and then the power switches is turned off, the bottom MOSFET connected to the non-inverting feedback input of the chip, while the top MOSFET open-collector output along with a bootstrap capacitor, provides a high-frequency switching signal to drive the low-side MOSFET as well.

Conclusion

RT7257CHZSP DC/DC switcher is a highly efficient and flexible design that is ideal for a variety of applications. It has a wide input voltage range and an integrated high-side low-side switch, along with a current-mode architecture for accurate and fast control of output voltages. The device is small and cost-effective, making it a great choice for many different applications.

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