ISL6269BIRZ

Frequency - Switching:	200kHz ~ 600kHz
Base Part Number:	ISL6269
Supplier Device Package:	16-QFN (4x4)
Package / Case:	16-VQFN Exposed Pad
Operating Temperature:	-40°C ~ 100°C (TA)
Control Features:	Enable, Frequency Control, Phase Control, Power Good
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Series:	Robust Ripple Regulator™ (R3)
Voltage - Supply (Vcc/Vdd):	5 V ~ 25 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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ISL6269BIRZ Application Field and Working Principle

Introduction

The ISL6269BIRZ is an ultra-low quiescent current synchronous buck controller IC. It has been designed to provide high efficiency solutions to complex power supply requirements. The ISL6269BIRZ also offers very low EMI, as well as output voltage tracking, in order to provide the best possible solution for a wide range of engineered power solutions.

Application Field

The ISL6269BIRZ is suitable for a wide range of regulated power supply applications. It is well suited for applications such as notebook computers, tablet PCs, portable media players, netbooks, smart phones and other heavily loaded power requirements. This device is also suitable for applications such as battery operated game controllers, digital video cameras and any other application which requires low power consumption and high efficiency.

Features

The ISL6269BIRZ features a low quiescent current (<750 nA) which makes it ideal for battery operated or power saving applications. It offers a wide input voltage range (3.3 V to 14 V) and can be used to regulate outputs up to 5 A. This device also comes with input UVLO with reset, soft-start and short-circuit protection. This IC also provides integrated compensation and voltage tracking for synchronous operation.

Working Principle

The ISL6269BIRZ operates in a synchronous buck topology and integrates all required features for current-mode control. The device consists of an internal oscillator, an error amplifier, a PWM comparator and gate drivers.When an input voltage is applied, the oscillator generates a sinusoidal signal which is compared to the feedback voltage which is divided by an adjustable voltage divider. This provides an error signal to the error amplifier which then converts it into an output voltage. The output voltage is used to switch the integrated MOSFETs which provide the desired output voltage.The ISL6269BIRZ also features a low shutdown current, programmable soft-start time, programmable dead-time, current-mode control and a programmable over-voltage protection.

Conclusion

The ISL6269BIRZ is an ultra-low quiescent current synchronous buck controller IC which offers low EMI, high efficiency and output voltage tracking to meet the power requirements of a wide range of applications. Its features such as wide input voltage range, low shutdown current, programmable soft-start time, dead-time and over-voltage protection make it an ideal choice for applications such as notebook computers, tablet PCs and portable media players. Its current-mode control and PWM comparator make it able to achieve very high efficiency in a wide range of applications.

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