ISL6553CB

Frequency - Switching:	50kHz ~ 1.5MHz
Base Part Number:	ISL6553
Supplier Device Package:	16-SOIC
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Enable, Frequency Control, Power Good
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	--
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	4.75 V ~ 5.25 V
Output Phases:	2
Number of Outputs:	2
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	PWM Signal
Part Status:	Obsolete
Packaging:	Tube

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ISL6553CB Application Field and Working Principle

PMIC (power management integrated circuits) are complex circuits designed to improve reliability, reduce energy costs, and provide better device performance. They are used in a wide range of applications, from medical instruments to automotive systems. Among the various types of PMICs, voltage regulators and DC-DC switching controllers are two common categories. Today, we will focus on ISL6553CB, a DC-DC switching controller specifically designed for high-side current sensing applications.ISL6553CB is a buck-mode current mode, high-side current sensing DC-DC switching controller. It provides constant frequency, analogue current mode control of a buck converter operating in a range from 10 to 600kHz and provides voltage regulation at the output. This device is especially suitable for high-side current sensing applications due to its low-condition, wide-output-voltage range, and high accuracy sensing accuracy.The main features of the ISL6553CB include:

• Input voltage range 5.5V to 18V
• Wide buck frequency range from 10kHz to 600kHz
• Integrated soft-start circuit
• Low 2.1V start-up threshold
• Accurate and consistent current sensing for up to 28 volts
• High efficiency at all load currents
• Simple losses tracking loop

ISL6553CB is an advanced device with a very low quiescent current, making it very efficient. This device can also handle high-side current sensing applications with high accuracy, making it an excellent choice for power conversion applications.The working principle of the ISL6553CB can be understood from this basic diagram. The device uses two voltage inputs, a supply voltage and the input voltage for the buck converter. The supply voltage powers the device, and the input voltage is converted to the desired output voltage. A sense resistor is required to measure the current through the inductor and allow the integrated control loop to regulate the output voltage. After the voltage is regulated, the device turns off the MOSFET and the inductor current begins to recirculate, thus allowing the energy stored in the inductor to be reused.In summary, the ISL6553CB is an advanced and highly efficient DC-DC switching controller designed for high-side current sensing applications. It provides accurate and consistent current sensing and a wide output voltage range, making it an excellent choice for power conversion applications. The working principle of the device can be understood from the basic diagram shown above.

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