ISL6521CB

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ISL6521CB is a PWM Synchronous buck converter used for providing a regulated output current during system operation. It is classified under PMIC - Voltage Regulators - Linear + Switching. This device provides a programmable output voltage in a 4 H-bridge configuration in order to optimize the power efficiency. It is used mainly in mobile phone and other handheld rechargeable devices and applications.

The ISL6521CB is based upon single-operating point power control design. It utilizes a low RDS(ON) MOSFETs, which also serves as the synchronous rectifier of the converter. This enables a high efficiency and allows the device to achieve greater than 90 percent efficiency over a wide load range. As such, the device can be used for providing a regulated power to the processor and other components in a system.

The ISL6521CB features adjustable soft-start and pre-bias start-up functions. The device also features built-in programmable current limits and a peak current sense amplifier for additional protection. Additionally, the ISL6521CB is capable of operating in either PWM/PFM mode to optimize power efficiency as a function of load current.

The ISL6521CB’s working principle is based upon the theory of synchronous rectification. Essentially, the device utilizes two MOSFETs which function as two separate switches during operation. One of the MOSFETs serves as the active switch which is used to regulate the output voltage, while the other serves as the synchronous rectifier which is used to increase power efficiency by reducing power dissipation. The device utilizes a pulse width modulation (PWM) control circuit to generate the requisite MOSFET switching waveforms which are used to control the output voltage. The two MOSFETs are configured in a four H-bridge configuration and the device is capable of providing a wide output voltage range.

The ISL6521CB is a highly power efficient and cost effective solution for providing a regulated voltage for processor related applications. The device features various protection and current limit features for improved reliability and protection. The device is also capable of operating efficiently in both PWM and PFM modes, making it an ideal choice for various applications.

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