LP38691SDX-1.8

Current - Output:	500mA
Base Part Number:	LP38691
Supplier Device Package:	6-WSON (3x3)
Package / Case:	6-WDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Temperature
Control Features:	--
PSRR:	55dB (120Hz)
Current - Supply (Max):	100µA
Current - Quiescent (Iq):	55µA
Series:	Automotive, AEC-Q100
Voltage Dropout (Max):	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	1.8V
Voltage - Input (Max):	10V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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LP38691SDX-1.8 Application Field and Working Principle

Introduction

Linear voltage regulators have a wide range of applications, such as in power supplies, battery chargers, smart phones, LEDs and automotive electronics. LP38691SDX-1.8 is a very popular voltage regulator that provides small size, high current, low noise and low power supply rejection ratio in its class. This article will discuss the application field and working principle of the LP38691SDX-1.8 voltage regulator.

Application Field

The LP38691SDX-1.8 is a low-dropout (LDO) linear voltage regulator with a wide input voltage of 3.2 V to 26.4 V and a constant output voltage of 1.8 V. It is suitable for a variety of applications such as digital voice recorders, cameras, digital radios, and medical devices.The LP38691SDX-1.8 efficiently provides up to 1.25 A output current and accelerates the start-up time. The device also protects against over-voltage conditions, making it suitable for use in battery-powered systems or other applications with wide fluctuations in the input voltage.

Features

The LP38691SDX-1.8 is designed to provide reliable and highly efficient voltage regulation while minimizing noise and power consumption. It features a low quiescent current (IQ) of only 17.5 μA, a high dropout voltage of 194 mV at a load of 1.25 A and an excellent power supply rejection ratio of 70 dB at 1 kHz. It also features a programmable current limit and soft-start.

Working Principle

The LP38691SDX-1.8 voltage regulator comprises three main components: an input voltage regulator, an output voltage regulator and an internal voltage divider. The input voltage regulator monitors the input voltage and maintains a reference voltage at the output of the voltage regulator.The output voltage regulator senses the reference voltage and adjusts the output voltage to maintain a steady output voltage. The internal voltage divider divides the input voltage and sets the current limit of the device. The LP38691SDX-1.8 voltage regulator also features a soft-start circuit which limits the inrush current to the output and helps to maintain voltage stability. The programmable current limit prevents the device from over-current conditions.

Conclusion

The LP38691SDX-1.8 voltage regulator is a highly efficient, low noise and low power consumption voltage regulator than can provide up to 1.25 A of current and protect against over-voltage conditions. It is suitable for a wide range of applications, such as digital voice recorders, cameras, digital radios and medical devices. It features a low quiescent current, a high dropout voltage and an excellent power supply rejection ratio. It also features a programmable current limit and a soft-start circuit.

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