AS1328B-BQFT-AD

Voltage - Input (Max):	5.5V
Supplier Device Package:	16-TQFN (3x3)
Package / Case:	16-WFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	1.5MHz
Current - Output:	3A
Voltage - Output (Max):	5.5V
Voltage - Output (Min/Fixed):	0.6V
Series:	--
Voltage - Input (Min):	2.7V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

AS1328B-BQFT-AD is a PMIC (Power Management IC) belonging to the voltage regulator family of DC/DC switching regulators. The device is capable of programmable step-down/buck switching, providing efficient power conversion and improved power management.

Features and Advantages

The AS1328B-BQFT-AD comes with several notable features, including:

• Integrated current limitation and protection functions
• Up to 3A output current
• Inductor-less design
• Programmable switching frequency up to 1.2MHz
• Soft start, operating up to 4V input
• Low power shutdown

These features make the AS1328B-BQFT-AD an ideal solution for high efficiency power conversion in compact, low-power space-constrained designs.

Applications

The AS1328B-BQFT-AD is well suited for a variety of applications that require efficient voltage conversion, including mobile devices and other hand-held electronic systems. It can be used in cellular phones, PDAs, digital cameras, wireless transmitters/receivers, and gaming devices. The device is also suitable for automotive applications, such as passive keyless entry, displays, and instrument clusters.

Working Principle

The AS1328B-BQFT-AD is based on a synchronous voltage regulator architecture with an external switch and a control loop. The device is designed to provide a high efficiency step-down/buck converter with a programmable switching frequency up to 1.2MHz. To achieve step-down voltage operation, the device uses a low side FET (Field Effect Transistor) switch to drive an inductor, which then steps down the input voltage. The output voltage of the device is set using an external resistor divider.The device also contains a control loop which controls the on-time of the FET switch. This control loop is used to regulate the average current through the main switch and to ensure that the output voltage is regulated to the desired voltage.The device has several built-in protection features, such as overcurrent protection, directional FET protection, and UVLO protection.

Conclusion

The AS1328B-BQFT-AD is a high performance PMIC (Power Management IC) designed for use in DC/DC step-down/buck applications. It has an integrated current limitation and protection functions, programmable switching frequency up to 1.2MHz, and soft start, operating up to 4V input, making it an ideal solution for efficient power conversion in compact, low-power space-constrained designs. The device is well suited for applications in cellular phones, PDAs, digital cameras, wireless transmitters/receivers, gaming devices, and automotive applications.

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