Current - Output:	3A
Base Part Number:	LP3963
Supplier Device Package:	DDPAK/TO-263-5
Package / Case:	TO-263-6, D²Pak (5 Leads + Tab), TO-263BA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Short Circuit
Control Features:	Enable
PSRR:	--
Current - Supply (Max):	15mA
Current - Quiescent (Iq):	9mA
Series:	--
Voltage Dropout (Max):	1.2V @ 3A
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	1.8V
Voltage - Input (Max):	7V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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LP3963ESX-1.8 Application Field and Working Principle

Introduction

LP3963ESX-1.8 is an integrated system solutions enabling low-power, highly efficient voltage regulation for portable equipment. It is designed for applications powered by single lithium cell battery, such as cell phones, PDAs and other handheld device. It is categorized as a PMIC - Voltage Regulators - Linear.

Features

Notable features of LP3963ESX-1.8 include master shutdown control, feedback regulation and sleep mode current. The master shutdown control allows for total shutdown of the LP3963ESX-1.8 by forcing the output voltage to 0V and reducing the power consumption to under 0.3 μA. Comparatively low quiescent current in specific operating conditions help to meet the low operating power requirements of portable consumer devices.The feedback regulation feature of the LP3963ESX-1.8 supports load current up to 280mA. This feature enables the LP3963ESX-1.8 to provide regulated voltage to various mobile devices of different power consumption requirements, while maintaining high efficiency and low output voltage ripple voltage.The sleep mode current is as low as 500nA when the output is in shutdown state. This ensures that the LP3963ESX-1.8 consumes minimal power when the device is in idle state.

Functionality

LP3963ESX-1.8 supports a wide range of operating voltage options. This means that the LP3963ESX-1.8 can efficiently provide power to mobile devices with different battery capacities. The LP3963ESX-1.8 can support operating voltages as low as 1.65V and up to as high as 3.6V, which allows for higher efficiency, in relation to voltage range, while operating with 1-cell lithium battery.The LP3963ESX-1.8 is also equipped with a dual-level foldback current limit. This allows the LP3963ESX-1.8 to protect the device from damaging current, while providing the optimal performance in all the possible operating conditions, including the start-up of device.The LP3963ESX-1.8 also features an adjustable output voltage and an instructional manual for getting started, allowing for the easy installation and configuration of the voltage regulator.

Applications

LP3963ESX-1.8 is suitable for applications that require voltage regulation on a single lithium cell battery, like cell phones, PDAs, other handheld devices, as well as other mobile devices. The low quiescent current, wide operating voltage range, as well as the additional protection mechanisms, make the LP3963ESX-1.8 ideal for portable power management solutions.

Working Principle

LP3963ESX-1.8 employs a standard buck-type topology in order to regulate the output voltage. The device is supplied by a single lithium cell battery and the switching transistor is biased with a regulated reference voltage. During normal operations, the transistor is switched on and off periodically, thus allowing for the voltage regulation with an output ripple voltage of less than 10mV. The voltage regulation is achieved by monitoring the feedback voltage signal at the Output terminal. This signal is then compared to the Voltage reference, generated by a band-gap voltage reference. When the feedback voltage exceeds the Voltage reference, the transistor is switched off and the output voltage is reduced. Conversely, when the feedback voltage is lower than the Voltage reference, the transistor is switched on and the output voltage is increased.

Conclusion

LP3963ESX-1.8 is a linear voltage regulator with single lithium cell battery as power source. It is integrated with master shutdown control, feedback regulation and sleep mode current. It supports wide range of operating voltages and equipped with dual-level foldback current limit. It is suitable for power management in cell phones, PDAs and other portable devices. LP3963ESX-1.8 employs a standard buck-type topology to regulate the output voltage, which is determined by comparing the feedback voltage level to the Voltage reference.

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