A8697ELJ-T

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Function:	Step-Down
Output Configuration:	Positive
Topology:	Buck
Output Type:	Adjustable
Number of Outputs:	1
Voltage - Input (Min):	8V
Voltage - Input (Max):	25V
Voltage - Output (Min/Fixed):	0.8V
Voltage - Output (Max):	20V
Current - Output:	4A
Frequency - Switching:	--
Synchronous Rectifier:	No
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width) Exposed Pad
Supplier Device Package:	8-SOIC-EP
Base Part Number:	A8697

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A8697ELJ-T application field and working principlePMIC, or Power Management Integrated Circuit, is part of any reliable semiconductor device. It is responsible for powering the whole circuit and managing the circuitry power. PMICs are essential in every electronic device, such as computers, mobile phones, and even automobiles.The A8697ELJ-T is a PMIC made by Diodes Incorporated. It belongs to the DC-DC switching regulators family and considered to be one of the most efficient Power Management Integrated Circuits (PMICs) on the market.The A8697ELJ-T is designed specifically for providing up to 4A of current to integrated circuits. It operates at a fixed 3.3V and in a range of -40°C to 85°C. It is a highly-integrated switching regulator, providing up to 5.25V at the output with a 3.2V to 5.5V input.The A8697ELJ-T consists of an integrated voltage regulator and a controller with its regulating loop. It is equipped with a typical switching frequency of 300kHz, allowing it to dynamically react to various current flow changes while ensuring reliable performance. It also provides short circuit protection, plus an over-temperature protection to prevent the device from becoming too hot.The input pin (VIN) of the switch regulator is connected to the voltage source, while the output pin (VOUT) is connected to the load. The current runs from the source through the switch, through the inductor, then to the load. The A8697ELJ-T is configured in the standard buck topology.The A8697ELJ-T is designed for a wide range of applications, including distributed power systems, dimmable LED backlighting, point of load converters and more. Additionally, it features voltage-mode operation which eliminates the need for external compensation components and provides fast transient response times.The working principle and operation of the A8697ELJ-T is relatively simple. It consists of two major parts: the regulator and the controller. The regulator drives the output pin and takes the voltage error from the reference voltage and the output voltage, while the controller compensates the dynamics of the whole system and controls the switching cycle of the switch.The voltage error is regulated by the feedback loop which consists of the error amplifier, voltage reference, and output voltage sensing network. The output voltage is then adjusted accordingly and the controller controls the switch with the error signal.To summarize, the A8697ELJ-T is an efficient and reliable power management integrated circuit belonging to the family of DC-DC switching regulators. It is designed for a wide range of applications, such as distributed power systems, dimmable LED backlighting, point of load converters. Its working principle and operation is relatively simple, with two major components, the regulator and controller working together to provide a stabilized output voltage.

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