ISL9103IRUNZ-T

Voltage - Output (Min/Fixed):	3.3V
Base Part Number:	ISL9103
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:	2.4MHz
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Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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ISL9103IRUNZ-T Application Field and Working Principle

The ISL9103IRUNZ-T is a fully integrated, non-synchronous buck regulator designed to provide a low quiescent current solution for AC/DC power adapter and battery charger applications such as smartphone, notebook, ultrabook, and tablet PCs. This device offers best-in-class performance, efficiency, layout flexibility, and simplifies the design of ultra-small circuits. It operates over a wide input voltage range and provides a low ripple output voltage. The ISL9103IRUNZ-T is available in the smallest package sizes.

Applications

The ISL9103IRUNZ-T is suitable for any application that utilizes separate power adapter and battery charger designs such as smartphones, tablets, and other portable electronic devices. Its minimum size and low quiescent current make it the ideal choice for space-constrained designs. It is also very useful for DC/DC converter applications where higher efficiency and noise immunity is desired. Some of the typical applications include:

• Portable Media Players
• Wireless Routers
• Set-top Boxes
• PC Motherboards
• Cell Phones
• Notebooks
• Smart Watches
• Tablet PCs
• Portable Projectors

Working Principle

The ISL9103IRUNZ-T operates as a non-synchronous buck regulator and it can operate in a continuous or a discontinuous mode. In discontinuous mode, the device maintains the output voltage at a pre-programmed level. In continuous mode, it maintains the output voltage with a minimum peak current. The device maintains a wide operating range which permits it to provide stable output voltage over load conditions ranging from 3A down to 500mA. The ISL9103IRUNZ-T integrates several features that contribute to the system performance. It utilises advanced MOSFET drivers to provide the required current surge during start-up and puts the internal Schottky rectifier diodes into an active state once the desired VOUT is reached. This helps to reduce the dynamic response time, eliminating the need for an external snubber circuit. Additionally, the ISL9103IRUNZ-T includes an internal compensation network and slope compensation for improved stability and output voltage accuracy. It also features a soft start and over current protection, preventing any excess current from damaging the power system. In order to maximise efficiency, the ISL9103IRUNZ-T features a 1.2V to 4.8V output voltage range, allowing it to adjust the output voltage to meet the requirements of the application. It also has an integrated FNPT compensation network (Frequency, Noise, Power and Temperature) that allows the device to optimize the switching frequency and ripple voltage in order to maintain the highest levels of efficiency.The ISL9103IRUNZ-T also integrates an output discharge function that discharges the output capacitance when the regulator is disabled, reducing the effects of residual voltages on the system. Finally, the ISL9103IRUNZ-T also supports the use of external clock sources, allowing the user to optimize the performance of the system.

Conclusion

The ISL9103IRUNZ-T is an advanced DC/DC switching regulator that offers high efficiency, low quiescent current, and small package sizes. It is ideal for space-constrained designs and offers an output voltage range of 1.2V to 4.8V. It features an internal compensation network, as well as external clock sources for improved performance and efficiency. The device is suitable for any application that requires low current operation, advanced features, and efficient power delivery.

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