S-8551AA-M5T1U

Voltage - Input (Max):	5.5V
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	1.2MHz
Current - Output:	600mA
Voltage - Output (Max):	4V
Voltage - Output (Min/Fixed):	1.1V
Series:	--
Voltage - Input (Min):	2V
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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The S-8551AA-M5T1U device is a highly efficient, wide output voltage range, DC-DC switching regulator. This integrated circuit is designed to use as a voltage step-up converter with Low-Dropout (LDO) linear regulator or as a stand alone Step-up converter. As a voltage converter, it reduces components, design complexity and increases system reliability. It is suited for single-cell Li-ion battery operated applications, such as PDAs and cell phones.

Application FieldThe S-8551AA-M5T1U is used in various applications such as telecommunication, portable products and digital power supplies. It has various features that make it suitable for these types of applications. It features a wide 3.16V to 22V output range, making it suitable for a variety of applications. It also features an internal voltage output detector which ensures that the output voltage does not exceed the rated value. This feature helps increase system reliability.The regulator is also suitable for low power applications because it has internal short circuit protection, so the circuit won\'t suffer from over-current or short-circuit conditions. It also has thermal shutdown protection which is important for high power applications, as it helps protect the system from over-temperature temperatures.

Working PrincipleThe S-8551AA-M5T1U DC-DC switching regulator is based on the Pulse Frequency Modulation (PFM) control technique. The device features four main active components: the feedback voltage source, the voltage reference, the error amplifier and the oscillator. The feedback voltage source is used to maintain the output voltage constant. The voltage reference, which consists of a bandgap reference, is used to compare the feedback voltage with a reference voltage. The error amplifier amplifies the difference between the feedback voltage and the reference voltage, producing an error signal. This signal is then used to modulate the oscillator and produce an oscillation frequency proportional to the error signal. The oscillator frequency is then used to control the on-time of the internal power switch, which is in turn responsible for the output current.The S-8551AA-M5T1U DC-DC switching regulator also features an internal voltage output detector which helps to limit the output voltage in case of an over-voltage condition. This feature helps protect the system from potential damage due to over-voltage.The S-8551AA-M5T1U DC-DC switching regulator is also designed to have very high efficiency. This is achieved by reducing the switching losses and by increasing the utilization of the output capacitor. This design feature reduces the power dissipated by the device, which in turn helps to reduce the overall power consumption of the system.

ConclusionThe S-8551AA-M5T1U DC-DC switching regulator is a highly efficient and wide output voltage range, DC-DC switching regulator designed for various applications, such as telecommunication, portable products and digital power supplies. It features a wide 3.16V to 22V output range, low ripple and low noise output, and internal voltage output detector to ensure that the output voltage does not exceed the rated value. It also features internal short circuit protection, thermal shutdown protection and high efficiency. This device is suitable for single-cell Li-ion battery operated applications, such as PDAs and cell phones.

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