MAX17543ATP+T

Voltage - Input (Max):	42V
Supplier Device Package:	20-TQFN (4x4)
Package / Case:	20-WFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	100kHz ~ 2.2MHz
Current - Output:	2.5A
Voltage - Output (Max):	37.8V
Voltage - Output (Min/Fixed):	0.9V
Series:	Himalaya
Voltage - Input (Min):	4.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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MAX17543ATP+T is a high performance, low quiescent current synchronous step-down DC-DC switching regulator produced by Maxim Integrated. It is categorized as a DC-DC switching regulator of PMIC (Power Management Integrated Circuit), specifically voltage regulator family. The application field and working principle of MAX17543ATP+T will be discussed in depth in the following parts.Application FieldMAX17543ATP+T is a low quiescent current switching regulator, which can support a 4V-75V input voltage. It can also output precise output voltages of 0V-5.5V, and can provide up to 8A output current. This allows it to be widely used in charging current-type applications, such as those of battery-powered systems.In battery-powered applications, the MAX17543ATP+T’s low quiescent current of 35µA ensures that the battery runs as long as possible. This makes the device an optimum for applications such as laptops and tablets. For example, in a laptop, it can be used to regulate and provide optimum current to the various devices that require stable input such as a CPU, GPU, LCD and WLAN. Besides laptop and tablet applications, the MAX17543ATP+T can also be used in application that requires high energy output such as LED lighting’s. When used in LED application, the device’s wide operating temperature range of -40℃ to +125℃ helps to ensure that the device will be able to operate in a variety of conditions.Furthermore, the MAX17543ATP+T has an easy to use design, making it relatively easy for it to be configured for use in many applications. Its small size also helps to make it a great choice for portable systems due to its space-saving benefits.Working PrincipleThe MAX17543ATP+T synchronous step-down switching regulator is composed of a power MOSFET, rectifier diode, low-dropout (LDO) linear regulator, charge pump circuit, load switch, and current/voltage sensing circuitry, all of which are integrated into a single package.The output voltage of the device is regulated by the power MOSFET that is turned on and off periodically. When it is turned on, the inductor stores energy and when it is turned off the energy is delivered to the output. The energy delivery (switching) frequency is kept stable by a frequency control loop. This switching frequency is adjustable and can be set by the user depending on the application requirements.The current/voltage sensing circuitry is used to monitor the voltage and current at the output to ensure that the output remains stable and within the predefined limits. To maximize efficiency, the device also incorporates a feature called “burst mode”. The burst mode allows the device to reduce its switching frequency when the output load current is below a predefined threshold. This helps to minimize power loss and improve efficiency.The linear regulator is used to generate the output voltage for light load conditions and when the “burst mode” is active. The charge pump circuit is used to increase the available current when the output load requires more than the MOSFET can provide.In conclusion, the MAX17543ATP+T is a high performance, low quiescent current synchronous step-down DC-DC switching regulator. It is suitable for applications such as battery powered systems and LED lighting’s due to its wide voltage/current range, easy to use design, and small size. It is also able to operate in a wide temperature range and has efficient power loss due to its switching frequency adjustment and burst mode features.

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