ST1S03PMR Integrated Circuits (ICs)

Voltage - Output (Min/Fixed):	0.8V
Base Part Number:	ST1S03
Supplier Device Package:	6-DFN-EP (3x3)
Package / Case:	6-VDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	1.5MHz
Current - Output:	1.5A
Voltage - Output (Max):	13.92V
Series:	--
Voltage - Input (Max):	16V
Voltage - Input (Min):	3V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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ST1S03 PMR Application Field and Working PrincipleST1S03 PMR, a product of STMicroelectronics, is a Voltage Regulator, DC/DC Switching Regulator. It provides a safe, low-noise, low power consumption and high efficiency DC/DC power solution. The ST1S03 PMR features a unique adaptive control loop ensuring smooth, accurate and stable current transition, allowing the regulator to smoothly deliver a consistent and reliable voltage for applications that require a robust and reliable output voltage.Application FieldST1S03 PMR is suitable for multiple applications such as Point-of-Load applications, Consumer Goods, Set-Top Box, Automotive, Medical and Industrial. It is designed to provide a steady and reliable power supply for wide range of application items that consume less power compared to other switching regulators. Its high accuracy and low power consumption makes it an ideal choice for applications like medical devices and set-top boxes where space and power efficiency are critical.Working PrincipleST1S03 PMR works on a Voltage Mode concept, using a two-stage architecture to produce the output voltage. It combines a switch mode power supply with linear voltage regulation to optimize the efficiency and noise performance of the regulator. In the first stage of the cycle a primary switch is turned ON and OFF, resulting in the output voltage being proportional to the duty cycle. In the second stage a voltage reference-based feedback loop reads the actual output voltage and compares it with the rated output voltage. If the output voltage is lower than the rated output voltage, the output voltage is reduced. Conversely if the output voltage is higher than the rated output voltage, it is increased. The combination of the switch mode and the linear regulation axes results in the controller delivering very little noise and with high efficiency.ST1S03 PMR also uses adaptive synchronous rectification to provide higher efficiency. Adaptive synchronous rectification means improved efficiency of the primary switch and enhancement in the output voltage ripple. Overall, the ST1S03 PMR can provide good noise reduction, better output voltage accuracy, and high efficiency. It is also integrated with USB Remote sensing at the output voltage, which compensates load regulation performance and is used to provide temperature compensation to ensure accurate and repeatable electrical performance.ConclusionIn conclusion, ST1S03 PMR is a specially designed DC/DC regulator that provides a safe, noise-free, low-power, and high-efficiency solution for portable and general-purpose applications that require robust and reliable voltage output. By using a voltage mode concept with a two-stage architecture, it ensures smooth, accurate and stable current transition, providing efficiency, accuracy and reliable power delivery. It also very effectively reduces noise and ensures high accuracy, making it an ideal choice for space- and power-sensitive applications.

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