ISL6558IRZA-T

Frequency - Switching:	80kHz ~ 1.5MHz
Base Part Number:	ISL6558
Supplier Device Package:	20-QFN-EP (5x5)
Package / Case:	20-VQFN Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, Frequency Control, Power Good
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	--
Duty Cycle (Max):	75%
Series:	--
Voltage - Supply (Vcc/Vdd):	4.75 V ~ 5.25 V
Output Phases:	4
Number of Outputs:	4
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	PWM Signal
Part Status:	Active
Packaging:	Tape & Reel (TR)

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ISL6558IRZA-T Application Field and Working PrincipleISL6558IRZA-T is a small-sized, high performance digital step-down voltage converter designed to offer an efficient and reliable power source solution for various applications. It belongs to the PMIC (Power Management IC) - Voltage Regulators - DC DC Switching Controllers category and offers adjustable output voltages ranging from 5V to 21V, with output current up to 2A (with external MOSFET). The ISL6558IRZA-T is one of the most versatile high performance DC-DC controller which provides superior performance in terms of line and load regulation, efficiency, current limit accuracy and foldback including fast load transient response. The device is specially designed to provide voltage conversion from a higher voltage source to a lower voltage level with wide input voltage range from 5.5V to 24V. It can be used in many traditional (e.g. computer, PDA, industrial systems) and emerging (e.g. white goods, point of use power, automotive) applications. The general operating principle of the ISL6558IRZA-T is the same as other DC-DC converters. The controller uses an internal or external MOSFET to switch a voltage output from the input voltage source. Pulse width modulation (PWM) is utilized to regulate the output voltage. A current sensing circuit is also employed to accurately monitor the output current. The internal reference voltage of 9.18V of the ISL6558IRZA-T allows it to be used in situations requiring higher than usual voltages. It also has a set of pre-programmable functions such as forced PWM, current limiting, soft start, slew-rate control, triangle wave dithering, etc. which enables it to work better with noisy input and loads. Additionally, anti-ringing control circuit and cycle-by-cycle current limiting are integrated to enhance system protection.The device also benefits from some built-in features such as a low dropout voltage, trimming capability for a wide range of output voltages, and adjustable soft-start. Additionally, the controller can be shut down or restarted via a digital input as well as by a dedicated shutdown pin. The ISL6558IRZA-T is available in SOT-23-5, TSSOP-58L and TDFN-33L packages which suits different applications perfectly. It is particularly suitable for a wide range of applications that require low input and output voltages, including notebook computers, digital cameras, PDAs, LCD monitors, DC-DC modules and portable devices. Overall, the ISL6558IRZA-T is an excellent solution for applications that require a versatile, high performance and cost effective DC-DC power source. Its small size and wide set of built-in features make it an ideal solution for various applications.

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