ISL6439IRZ-T

Frequency - Switching:	300kHz
Base Part Number:	ISL6439
Supplier Device Package:	16-QFN-EP (5x5)
Package / Case:	16-VQFN Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, Phase Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	100%
Series:	--
Voltage - Supply (Vcc/Vdd):	2.97 V ~ 3.63 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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ISL6439IRZ-T Application Field and Working Principle

PMIC – Voltage Regulators – DC DC Switching ControllersThe ISL6439IRZ-T is a current-mode non-synchronous buck step-down switching controller with integrated synchronous rectifiers. It is designed to provide cost-effective and high-efficiency power solutions for CPU, memory, DDR and other system power supplies. The integrated voltage feedback unit and over-current protection circuit make the ISL6439IRZ-T an ideal choice for motherboard applications.

Application Field

The ISL6439IRZ-T is designed for a variety of applications such as: CPUs, memories, DDRs, and PC gaming systems. Due to its cost-effective and high-efficiency power supply solutions, it is an ideal solution for motherboards. It is a suitable solution for designs requiring separate load supply paths as it can simultaneously control multiple separate loads with independent CLK signals.

Working Principle

The ISL6439IRZ-T features a non-synchronous buck switching controller. In order to provide a cost-effective and high-efficiency power solution for the system, the integrated voltage feedback unit, over-current protection circuit, and synchronous rectifiers must work together. The integrated voltage feedback unit monitors the output voltage and automatically regulates the output voltage. In addition, the device also has a switch current, sense resistor voltage, and secondary-side linear regulator module to detect the output current, sense the voltage drop, and adjust the output voltage respectively. The integrated over-current protection circuit protects the IC and system components from over-currents. This circuit prevents the output current from exceeding the set current limit. Finally, the integrated synchronous rectifiers reduce the input power dissipation efficiency and eliminate the need for separate secondary rectification. This provides a cost-effective and highly-efficient power solution for CPU, memory, DDR, and other system power supplies.

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