MIC2951-03YM-TR

Current - Output:	150mA
Base Part Number:	MIC2951-03
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity
Control Features:	Enable
PSRR:	--
Current - Supply (Max):	8mA
Current - Quiescent (Iq):	300µA
Series:	--
Voltage Dropout (Max):	0.6V @ 150mA
Voltage - Output (Max):	29V
Voltage - Output (Min/Fixed):	1.24V (5V)
Voltage - Input (Max):	30V
Number of Regulators:	1
Output Type:	Adjustable (Fixed)
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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MIC2951-03YM-TR Application Field and Working Principle

PMIC (Power Management Integrated Circuit) devices are essential elements in the world of high performance electronics. MIC2951-03YM-TR is a PMIC device under the category of Voltage Regulators/Linear, and its unique features make it a great choice for various circuits.The MIC2951-03YM-TR is a 200mA low dropout post-regulator that generates a precise 5V output voltage, achieved by a combination of an external voltage divider and an internal error amplifier. This post-regulator is designed to start up and maintain regulation with an input voltage that can range from 10V to 15V; it comes in a small SOT-89 package, making it suitable for many applications where board space and thermal requirements are critical. The 200mA output current capability, tight line and load regulation, low supply current and low dropout voltage, along with the SOT-89 package, makes the MIC2951-03YM-TR as one of the best-of-class, precision 5V post-regulators on the market.

Functional Features

The MIC2951-03YM-TR offers some amazing functional features for enhanced voltage regulation performance:* Fast line transient response: The error amplifier filtering feature delivers improved line transient response (load steps of up to ±10mA).* Low input voltage operation: Starting up operation is achieved with an input voltage of only 10V.* Low dropout voltage: With an input voltage of 10V, the device is able to deliver a regulated 5V output voltage with a dropout voltage of 550mV.* Droop Control: With a minimum load current no less than 10mA, the device achieves improved load regulation performance.* Low supply current: The MIC2951-03YM-TR can supply regulated 5V output voltage with a supply current of only 10μA.

Application Field

The MIC2951-03YM-TR provides an optimal, low-cost solution for portable electronic equipment powered by an on-board battery or an external power source. Its wide range of input voltage and current levels, fast line transient response, low dropout voltage and low supply current, make the MIC2951-03YM-TR an excellent choice for a variety of applications such as:* Laptop power supply* TV set-top box and other consumer electronics* Cellular phone, PDA and other handheld appliances* Telecommunications systems

Working Principle

The MIC2951-03YM-TR is a low dropout post-regulator that generates a precise 5V output voltage. This post-regulator is able to detect the input voltage through an external voltage divider and compare it to an internal reference voltage. When the input voltage is higher than the reference voltage, an error signal will be generated and adjusted with an error amplifier to control a galvanically isolated NMOS power switch.The error amplifier will vary the gate voltage of the NMOS power switch according to the desired output voltage. When the input voltage is lower than the reference voltage, the error amplifier will increase the gate voltage and increase the turn-on time of the switch to maintain the output voltage. On the other hand, when the input voltage is higher than the reference voltage, the error amplifier will decrease the gate voltage and reduce the turn-on time of the switch to maintain the output voltage. This way, the post-regulator ensures that the output voltage remains constant.

Conclusion

The MIC2951-03YM-TR is a powerful post-regulator that has the features and performance necessary to deliver a precision 5V output voltage. The device is suitable for a variety of applications, including portable electronic devices and telecommunications systems. Its low input voltage operation, low dropout voltage and low supply current makes it an excellent choice for devices powered by an on-board battery or an external power source. Moreover, its fast line transient response, together with its droop control feature makes it an optimal choice for providing a reliable and precision 5V output voltage.

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