ISL9104AIRUNZ-T7A

Voltage - Output (Min/Fixed):	3.3V
Base Part Number:	ISL9104A
Supplier Device Package:	6-UTDFN (1.6x1.6)
Package / Case:	6-UFDFN
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	4.3MHz
Current - Output:	500mA
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	6V
Voltage - Input (Min):	2.7V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The ISL9104AIRUNZ-T7A is the latest integrated DC-DC buck converter device from Renesas. It operates with an input voltage range of 3V to 5.5V and provides 1.2V to 5V at outputs of up to 2A. The device uses a combination of MOSFETs, current sensing and loop control schemes, along with advanced protection and diagnostic features, to ensure high efficiency and reliability.

Application Field and Working Principle

The ISL9104AIRUNZ-T7A is ideal for powering portable electronic devices, such as handsets, personal digital assistants (PDAs), and digital cameras, due to its low profile and low quiescent current. The device features a monolithic buck regulator, which switches in a fixed frequency between 50 kHz – 500 kHz. The voltage regulation is based on a closed-loop control implemented with a precision reference, error amplifier and pulse-width modulator (PWM). The error amplifier compares the output voltage to a reference and adjusts the duty cycle of the PWM accordingly. This allows for tight regulation over-load and line variations, and it provides a high level of Transient Response. The ISL9104AIRUNZ-T7A also has an integrated MOSFET in the output stage, which further increases efficiency.The device contains integrated over-temperature protection, over-current limiting, and soft-start. The over-current protection monitors the output current on a pin-selectable basis, and immediately reduces the VOUT in case of over-current. The soft-start feature prevents input current surges as the part turns on, and it can also be used to reduce overshoot during operation.

Features

The ISL9104AIRUNZ-T7A is a versatile DC-DC buck converter with a wide range of features designed to provide high efficiency, reliability, and ease of implementation. Its key features include:* Wide input voltage range of 3V to 5.5V* Output voltage range of 1.2V to 5V* Output current up to 2A* Internal synchronous MOSFET with integrated protection* Fixed switching frequency between 50kHz – 500kHz* Precision voltage reference (2.5% accuracy)* Error Amplifier and PWM for closed-loop control* Over-temperature protection* Over-current limiting* Soft-start

Conclusion

The ISL9104AIRUNZ-T7A is a highly integrated DC-DC buck converter which provides high efficiency and reliability in a small package. It is ideal for powering a wide range of portable electronic devices, such as handsets, PDAs, and digital cameras. With its wide input voltage range and precision reference, the device is able to provide accurate regulation, and its integrated protection features ensure reliable operation.

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