Series:	--
Packaging:	Tube
Part Status:	Active
Applications:	Power Supply, Automotive Applications
Voltage - Input:	7 V ~ 18 V
Number of Outputs:	1
Voltage - Output:	--
Operating Temperature:	-40°C ~ 150°C
Mounting Type:	Through Hole
Package / Case:	Multiwatt-8 (Straight Leads)
Supplier Device Package:	8-Multiwatt
Base Part Number:	L9911

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Introduction

The L9911I (Integrated Voltage Regulator) is a member of the STMicroelectronics family of high performance, low cost voltage regulators. It is multi-channel voltage regulator designed for smart phone applications. It is a single mode, multi-channel step-up/step-down regulator that can deliver up to 5 Amps of output current in stepping down mode and up to 1 Amp of output current in stepping up mode.The L9911I is designed with four main features: high efficiency, low noise level, small size, and a wide input voltage range. The L9911I supports 4 different output voltage ranging from 1.2 V to 3.6 V and has an adjustable switching frequency ranging from 2MHz to 20MHz. The L9911I implements various protection functions, including voltage protection and thermal protection. In addition, the L9911I provides a rich diagnostic interface for monitoring the system’s operations efficiently.

Application Fields

L9911I voltage regulator is designed for smart phone applications and other consumer electronics applications such as digital cameras, portable DVD players, set-top boxes, navigation systems and personal media players. The device is designed to support several different voltages, ranging from 1.2 V to 3.6 V, providing a wide range of application options for different products. The device can be used for up to 5 Amps output load offering greater power efficiency.The device also provides multiple output options and can provide both voltage step-up and step-down conversion. It has an adjustable switching frequency ranging from 2 MHz to 20 MHz, enabling easy configuration and wide range of output regulators. The device is also electrically protected with various protection functions, providing reliable and robust operation.

Features

The key features of L9911I include:- High efficiency up to 95% operating in 4.2V to 4.5V range- Low noise profile and ripple- 4 Channels supporting adjustable step up/down with up to 5A of output current (1A in stepping up mode)- Wide input voltage range from 2.5V to 10V- Adjustable switching frequency from 2 MHz to 20 MHz- Thermal protection and over-voltage protection for safe operation- Rich diagnostic interface for monitoring the system status and detecting potential problems

Working Principle

The L9911I voltage regulator works by generating a regulated voltage through the combination of switching and regulation. The device contains an internal switching and regulation circuit, which is designed to step up or step down a voltage as needed. The device first uses an internal switch to draw energy from an unregulated DC power source, and then steps it up or down to achieve the desired output voltage. The device also includes a feedback loop which is used to control the switching and regulate the output voltage of the device.When the output voltage of the L9911I is higher than the preset target level, the feedback voltage is decreased and the device switches more frequently to reduce the output voltage. On the other hand, when the output voltage is lower than the target level, the feedback voltage is increased and the device switches less frequently to increase the output voltage. The switching frequency of the device can also be adjusted using the internal frequency control signal. The device contains various protection features such as over-voltage protection and thermal protection as well as a rich diagnostic interface for monitoring the system status and detecting potential problems.

Conclusion

The L9911I is an integrated voltage regulator designed for smart phone applications which provides high efficiency, low noise performance, and a wide input voltage range. The device is capable of providing up to 5A output current at stepping down mode and up to 1A at stepping up mode. The device is also equipped with multiple protection functions, a rich diagnostic interface and adjustable switching frequency, making it suitable for a wide range of applications such as portable DVD players, digital cameras, navigation systems and more.

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