ISL6522CB

Frequency - Switching:	200kHz
Base Part Number:	ISL6522
Supplier Device Package:	14-SOIC
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Enable, Frequency Control, Phase Control, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	100%
Series:	--
Voltage - Supply (Vcc/Vdd):	10.8 V ~ 13.2 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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Introduction

The ISL6522CB is a single-phase synchronous step-down voltage regulator controller. It is designed for use in high-density applications requiring tight output-voltage accuracy and efficiency. This controller can be integrated into a small, low-component-count solution that operates from an input supply in the 2.5V to 12V range. The ISL6522CB uses an external power switch to control the switching frequency and duty cycle, and contains a P-channel synchronous FET driver and a low-side FET driver circuit consisting of a gate driver and associated gate-drive resistor. The controller also includes voltage and current protection features, such as adjustable over-voltage protection, short-circuit protection, and cycle-by-cycle current limit.

Application Field

The ISL6522CB is suitable for a wide range of applications and is targeted to automotive, communications and consumer markets. These include point of load applications such as microprocessors, field programmable gate array (FPGA) and digital signal processors (DSP) and transceivers.The ISL6522CB is optimized for use in high frequency, high step-down ratio applications that require a highly efficient power conversion solution. It is ideal for use in applications where high-efficiency and small size are essential, such as telecommunications infrastructure, high-reliability computing, networking, and industrial process control.ISL6522CB can be used in combination with external synchronous FETs to form a wide range of synchronous step-down switching regulators, with outputs ranging from 3.3V to below 1V. As a result, it can be used to provide power solutions for a extensive variety of applications, including high-current handheld devices, notebook adapters, or active mobile component suppliers.

Working Principle

The ISL6522CB controller is designed to control the operation of a synchronous buck converter in applications that require tiny packages and tight output-voltage accuracy over a wide range of input and output voltages.The ISL6522CB works by using the integrated PWM controller to drive an external N-channel No-RDS(ON) power MOSFET switch in a buck topology, allowing it to achieve high efficiency and accurate power conversion. The output voltage is regulated through the integrated voltage error amplifier which senses the output voltage and compares it to the reference voltage. The controller can be implemented as a single-phase buck converter with no need of compensation. The ISL6522CB also includes protection features to ensure the safety of the system. It includes over-voltage protection, short-circuit protection, and cycle-by-cycle current limit. The controller also provides an adjustable soft start feature to ensure the converter is started correctly and to limit the inrush current when the system is first powered up.

Conclusion

The ISL6522CB is a high-performance single-phase synchronous buck-boost voltage regulator controller, designed for use in applications that require high-efficiency and small size. It is optimized for high step-down ratio applications and can be integrated into a low-component-count solution. It also comes with integrated protection for over-voltage, short-circuit, and current limit. The ISL6522CB is ideal for a wide variety of applications, from point of load to telecommunications infrastructure.

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