BD70GA3WEFJ-E2 Integrated Circuits (ICs)

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The BD70GA3WEFJ-E2 from ROHM is a low-dropout regulator that provides excellent load and line regulation in applications ranging from consumer to industrial and automotive equipment. This device is intended for use as a post regulator for switching regulators, for new designs utilising a linear mode or for drop-in replacements for existing designs.

Overview

The BD70GA3WEFJ-E2 low-dropout regulator is a 3-terminal, surface-mount device with a low-noise output voltage of 2.5V to 6.0V adjustable forms. The device features a low dropout voltage, wide line and load regulation range and high output current capability. Its compact package size and fast-transient response allow the BD70GA3WEFJ-E2 to be used in a wide range of applications.

This device utilizes a current mode control with an externally adjustable operating frequency to reduce output noise and improve load transients. The current mode architecture allows for a wide range of loop compensation to match various external components. A unique feature of the BD70GA3WEFJ-E2 is that it does not require a compensation pin, allowing for better performance and larger loop bandwidth without component changes.

Features

• Low dropout voltage (typ. 0.3V @ 1.0A)
• Wide line and load regulation range
• Low output noise (typ. 20µVrms @ 1.0A)
• External frequency control
• High output current capability (1.0A)
• Compact package size
• Fast transient response

Applications

• Mobile devices
• Digital still cameras
• Portable instrumentation
• Personal computers
• Televisions
• Stereo/DVD systems
• Industrial and automotive equipment

Working Principle

The BD70GA3WEFJ-E2 uses a current mode approach to regulate the output voltage. This allows for a wide range of loop compensation to match various external components. The external frequency control allows for a wide spread of frequencies and reduces output noise and improves load transients. The device also features a low dropout voltage, wide line and load regulation range, high output current capability and fast transient response. This enables the device to be used in a wide range of applications.

The BD70GA3WEFJ-E2 uses an error amplifier, a driver and a PNP output stage to regulate the output voltage. The error amplifier compares the ground referenced output voltage with a reference voltage, and the error voltage is amplified and fed to the driver, which is connected with the PNP output stage. When the output voltage decreases, the driver increases the base current of the PNP output stage and increases the output voltage. This process continues until the output voltage is equal to the reference voltage.

The BD70GA3WEFJ-E2 also includes various protection features for a reliable operation. It includes a current protection circuit to protect the device from a short circuit and an overheating protection circuit to protect the device from an over temperature. Additionally, the device includes an overvoltage protection circuit to protect the device from an excessive voltage input.

Conclusion

The BD70GA3WEFJ-E2 voltage regulator from ROHM is an ideal solution for applications requiring a low-dropout regulator in a small package size. The device features a low dropout voltage, wide line and load regulation range, and high output current capability. It also features an external frequency control and a low-noise output voltage. The protection features ensure a reliable operation in a wide range of applications, making the BD70GA3WEFJ-E2 an ideal solution for consumer, industrial, and automotive equipment.

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