LM4140ACM-4.1

Noise - 0.1Hz to 10Hz:	2.2µVp-p
Base Part Number:	LM4140
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C (TA)
Current - Supply:	400µA
Voltage - Input:	1.8 V ~ 5.5 V
Noise - 10Hz to 10kHz:	--
Series:	--
Temperature Coefficient:	3ppm/°C
Tolerance:	±0.1%
Current - Output:	8mA
Voltage - Output (Min/Fixed):	4.096V
Output Type:	Fixed
Reference Type:	Series
Part Status:	Obsolete
Packaging:	Tube

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Introduction

The LM4140ACM-4.1 is a power management integrated circuit (PMIC) specifically designed to provide voltage references and precision output-voltage regulation. It is suitable for use in a broad range of applications. This article will discuss the application field and operating principle of the LM4140ACM-4.1.

Application Field

The LM4140ACM-4.1 is a versatile PMIC that provides accurate output-voltage regulation and point-of-load power-supply architectures. It is suitable for use in many applications such as:• Circuit protection• Battery management• CPU power supply• Automotive systems• LCD driver circuits• Communications equipment• Portable computing• Portable medical deviceThe LM4140ACM-4.1’s wide operating range and adjustable output voltage allows for custom operating conditions for any application. Its low quiescent current and high efficiency ratings make it an ideal choice for energy-efficient applications.

Working Principle

The LM4140ACM-4.1 is able to provide regulated, accurate output-voltage for a wide range of applications by relying on a two-phase voltage-regulation system. First, the PMIC monitors the feedback of the output voltage, compares it to a reference voltage, and adjusts the voltage based on a difference between the two signals. Second, the PMIC regulates the voltage by controlling the duty-cycle of the external power MOSFET and adjusts the output current accordingly.The LM4140ACM-4.1 is a “current-mode” controller, meaning it controls the voltage by regulating the current flowing in the power MOSFET. A voltage-mode controller, on the other hand, would control the voltage by varying the MOSFET’s gate voltage.

Conclusion

The LM4140ACM-4.1 is a versatile, highly efficient PMIC designed to provide voltage references and output-voltage regulation for many types of applications. It utilizes a two-phase voltage-regulation system to achieve accurate output-voltage. The LM4140ACM-4.1 is a current-mode controller, controlling the voltage by regulating the current flowing in the power MOSFET. It is suitable for a wide range of applications, including circuit protection, battery management, CPU power supply, and more.

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