LP3965EMPX-1.8

Current - Output:	1.5A
Base Part Number:	LP3965
Supplier Device Package:	SOT-223-5
Package / Case:	TO-261-5, TO-261AB
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):	0.55V @ 1.5A
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Part Status:	Obsolete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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Introduction

The LP3965EMPX-1.8 is a linear voltage regulator, belonging to a section of the power management IC (PMIC) family. The device is specifically designed for applications that require ultra-low current consumption over a wide range of operating conditions. The LM3965EMPX-1.8 linear voltage regulator offers adjustment of the output voltage via a resistor divider network and a precise 1.8V output also reduces the number of external components required to build the regulator circuit. This article looks at its application field as well as its working principle.

Application Field of LP3965EMPX-1.8

The LP3965EMPX-1.8 is ideal for applications that need to maintain precise power in order to preserve high quality data. The device is often used to drive low-power logic circuits, including FPGAs, DSPs, ASICs, and MCUs. It is particularly suitable for hand-held wireless devices, where low power consumption is essential to maximize battery life. With a very low on-state current consumption of 15µA @ VOUT = 1.8V, it is perfect for handheld battery powered applications. This device also reduces power consumption in mobile communication systems, such as PDAs, smartphones, tablets, and mobile servers used in WANs, by conserving power. It is also used in applications such as portable medical devices and e-meters, as well as in general-purpose power supply applications.

Working Principle of LP3965EMPX-1.8

The LP3965EMPX-1.8 is a low power linear voltage regulator that can provide an output voltage of 1.8V. It is specifically designed for load currents up to 100mA. The internal circuitry regulates an output voltage that can be adjusted externally by means of a resistor divider network.The device regulates the output voltage by comparing the internal 1.262V reference voltage with the voltage at the feedback pin. A resistive divider network connected to the device’s FB pin sets the output voltage. If a load is applied to the output, the voltage at the feedback pin drops, and a differential voltage is created. The differential voltage is then compared to the reference voltage, and the device adjusts the regulated output voltage accordingly. If the output voltage decreases due to a load, the device will reduce the output current in order to maintain the regulated output voltage. Similarly, if the output voltage increases due to a decrease in the load current, the device will increase the current in order to maintain the regulated output voltage.

Conclusion

The LP3965EMPX-1.8 is a linear voltage regulator that is part of the PMIC family and can provide an output voltage of 1.8V with very low current consumption. The device is suitable for applications that need to conserve power, such as portable medical devices and e-meters, as well as hand-held wireless devices, including PDAs, smartphones, tablets, and mobile servers used in WANs. The device is also often used to drive low-power logic circuits, including FPGAs, DSPs, ASICs, and MCUs. It is easy to implement, as it does not require any external components to set the output voltage and it can adapt to changing output voltages based on the load current.

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