RT8009-33GJ5

Voltage - Input (Max):	5.5V
Supplier Device Package:	TSOT-23-5
Package / Case:	SOT-23-5 Thin, TSOT-23-5
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	1.25MHz
Current - Output:	600mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	3.3V
Series:	--
Voltage - Input (Min):	2.5V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

RT8009-33GJ5 is a DC-DC switching regulator with built-in power MOSFET, high efficiency and long operation time. It is designed to convert voltage in a wide range while delivering stable fixed output voltage at the same time. The main feature of the RT8009-33GJ5 is its synchronous rectification circuit which allow for high efficiency and very low power dissipation. It also comes with integrated under-voltage lockout (UVLO) for low output voltage protection.

Application field

RT8009-33GJ5 is ideal for powering applications where low voltage, low current and high efficiency is desired. Common applications includes but not limited to small form-factor microcontrollers, cellular phones, battery-powered systems, handheld meters and portable instruments.Battery-powered systems are especially suited for RT8009-33GJ5 due to its wide voltage range and very low quiescent current. This allows for longer operation time by dissipating minimal amount of energy.In addition, RT8009-33GJ5 also offers a high power density with its sophisticated topology. This enables the same output power to be produced in a smaller PCB area compared to traditional regulators.

Working Principle

The RT8009-33GJ5 is a step-down DC-DC switching regulator. It is based on a hysteretic power conversion principle which is enabled by an external P-channel MOSFET.The output voltage, VO, is regulated through a closed-loop control stage and is adjusted with the help of an internal voltage reference. This voltage reference is then compared against the output voltage in order to determine the amount of current needed to maintain the desired set-point.In order to ensure a stable operation, current-mode control is used. This technique monitors the peak current of the output switch and adjusts it accordingly in order to maintain a voltage regulation.The synchronous rectification circuit which is integrated into the RT8009-33GJ5 allows for higher efficiency of up to 96% over a wide output current trip range.

Protection Features

The RT8009-33GJ5 comes with various protection features to protect the circuit against over-current, short-circuit and overheating.The circuit has built-in output over-current protection which limits the load current in order to prevent any damage to the chip and the power MOSFET.The RT8009-33GJ5 also has short-circuit protection which detects the short-circuited load condition and shuts down the power MOSFET immediately.Lastly, a pulse by pulse current limit prevents the output current to exceed a certain limit, ensuring a safe operation.

Conclusion

RT8009-33GJ5 is an efficient and highly integrated DC-DC switching regulator with built-in power MOSFET, wide input voltage range, high efficiency and long operation time. This feature-rich regulator makes it perfect for small form-factor applications such as microcontrollers, cellular phones and portable instruments. The RT8009-33GJ5 also provides several protection features such as over-current, short-circuit and overheating detection.

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