S-812C55BPI-C5JTFU Integrated Circuits (ICs)

Number of Regulators:	1
Voltage - Input (Max):	16V
Voltage - Output (Min/Fixed):	5.5V
Voltage - Output (Max):	--
Voltage Dropout (Max):	0.23V @ 100mA
Current - Output:	75mA
Current - Quiescent (Iq):	500nA
Current - Supply (Max):	2.5µA
PSRR:	--
Control Features:	Enable
Protection Features:	Short Circuit
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	6-SMD, Flat Leads
Supplier Device Package:	SNT-6A (H)
Series:	S-812C
Packaging:	Tape & Reel (TR)
Part Status:	Active
Output Configuration:	Positive
Output Type:	Fixed

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Introduction
The S-812C55BPI-C5JTFU is a voltage regulator designed, manufactured, and sold by Rohm Corporation. This device is part of a family of products dedicated to providing power regulation and protection to micro-electronic devices. It is labeled as a PMIC or Power Management IC and falls under the category of Linear Voltage Regulators due to its operating principle. This article will discuss the application fields of the device as well as the principles of power control that are complexly interrelated in its operation.
Application Fields
The S-812C55BPI-C5JTFU is a comprehensive device that can be applied to a wide array of applications. In its range of features and functions, it provides three distinct paths for regulating power: output voltage regulation, maximum current protection and input voltage setting. These features make it suitable for a variety of power needs such as core voltage from a micro-processor, battery protection, and embedded systems that require a wide input voltage operation range.
When it comes to output voltage regulation, the device offers both accurate and efficient voltage regulation with a voltage accuracy of ±2% error. This is accomplished by the use of an internal reference voltage, an error amplifier and two digital-controlled resistors. These components together provide precise digital control of output voltage while maintaining a high power efficiency. This makes the device suitable for use in applications where output voltage accuracy is important or where stringent current or voltage conditions must be maintained.
The second path of power control it provides is maximum current protection. This is designed to protect the system from over current situations, where the current output of the regulator reaches a dangerous level. This is done by sensing the output current with the use of an internal current monitoring circuit. If the current exceeds a preset level, an alert signal is sent and the power is cut off. This provides a high level of protection for the system in case of an over current situation.The final path of power control the device provides is input voltage setting. This is an important feature for systems that require a wide input voltage range. This allows the device to adjust the input voltage from 8 to 18 V depending on the needs of the system. This is done through the use of a voltage control block, which measures the input voltage and then adjusts accordingly for the optimal input voltage for the system.
Working Principle
In order to understand how the device works, it is essential to understand the principles by which it regulates power. At the core of the device is the principle of negative feedback. This is a process wherein a signal is sent out, typically to a control device, and the same signal is monitored and regulated so as to maintain a steady-state. This principle is used in the device in two ways: to regulate the output voltage, and to provide protection from over current situations.
The output voltage is regulated by a combination of components that make up the voltage control block. This consists of an internal reference voltage, an error amplifier, and two digital controlled resistors (DCRs). The error amplifier sends a signal to the DCRs, which are used to adjust the output voltage in order to maintain the desired output voltage. This can be done on the fly and allows for efficient and accurate voltage regulation.
The second way in which the negative feedback principle is utilized, is for the purpose of monitoring the output current. This is done via an internal current-monitoring circuit. This circuit monitors the output current and sends a signal to the power controller if the current reaches a preset level. In response, the power is shut off in order to protect the system from an over current situation. Overall, the S-812C55BPI-C5JTFU is an advanced linear voltage regulator suitable for a variety of power needs. It provides accurate and efficient output voltage regulation via the use of a negative feedback loop, as well as maximum current protection. In addition, the device also allows for a wide input voltage range, allowing for flexibility in its operation. All these features make this device the perfect choice for a variety of applications.

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