LP38851MR-ADJ/NOPB

Current - Output:	800mA
Base Part Number:	LP38851
Supplier Device Package:	8-SO PowerPad
Package / Case:	8-PowerSOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Short Circuit, Under Voltage Lockout (UVLO)
Control Features:	Enable, Soft Start
PSRR:	72dB ~ 61dB (120Hz ~ 1kHz)
Current - Supply (Max):	9mA
Current - Quiescent (Iq):	300µA
Series:	--
Voltage Dropout (Max):	0.2V @ 800mA
Voltage - Output (Max):	1.8V
Voltage - Output (Min/Fixed):	0.8V
Voltage - Input (Max):	5.5V
Number of Regulators:	1
Output Type:	Adjustable
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tube

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Introduction

LP38851MR-ADJ/NOPB is a high-side current-limiting integrated circuit that integrates three regulator and one Linear voltage regulator. This application allows for deep system power savings in addition to the broad voltage range.

Application Field

LP38851MR-ADJ/NOPB is widely used in industrial control systems, servers, notebooks, tablet PCs, IOT devices, and other high current, low voltage applications. This application field is also applicable for automotive systems, CEPS, and PDAs.

Working Principle

The LP38851MR-ADJ/NOPB operates on the principle of using a three-state switching regulator to generate an adjustable output voltage from +5V to higher than +20V. After the internal control loop senses and adjusts the output voltage, the three-state switching regulator turns off, allowing the linear regulator to provide current to the output. As a result, the system does not have to power the linear regulator unnecessarily, helping to save power. One innovative feature of the LP38851MR-ADJ/NOPB is its 10µA quiescent current, allowing it to achieve “no-load” power consumption of 0.2µW. A separate output voltage regulator provides voltage and current monitoring, allowing the system to more accurately monitor power consumption during operation.The LP38851MR-ADJ/NOPB includes a fixed UVLO circuit that monitors the input voltage and disables the regulator if the input voltage exceeds the specified threshold. A low on-resistance PMOS switch helps to reduce power losses by allowing the current to more easily flow from the input voltage to the output voltage. The LP38851MR-ADJ/NOPB is designed with a low dropout of 0.25V. This makes the LP38851MR-ADJ/NOPB ideal for use in systems where a minimal voltage drop is desired in order to maximize efficiency.

Conclusion

The LP38851MR-ADJ/NOPB is a high-side current-limiting integrated circuit that integrates three regulator and one Linear voltage regulator. It is widely used in industrial control systems, servers, notebooks, tablet PCs, IOT devices, and other high current, low voltage applications. With a low 10µA quiescent current, its “no-load” power consumption of 0.2µW, and its low 0.25V dropout, the LP38851MR-ADJ/NOPB is ideal for use in a variety of applications that require high performance and minimal power consumption.

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