MIC29150-12WU-TR

Voltage Dropout (Max):	0.6V @ 1.5A
Base Part Number:	MIC29150-12
Supplier Device Package:	TO-263-3
Package / Case:	TO-263-4, D²Pak (3 Leads + Tab), TO-263AA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity, Transient Voltage
Control Features:	--
PSRR:	--
Current - Output:	1.5A
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	12V
Voltage - Input (Max):	26V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The MIC29150-12WU-TR is a high efficiency, adjustable step-down switching regulator with 4-bit, three terminal adjustable output voltage range from 2.500 V to 1.500 V. The device is capable of supplying up to 30 watts of power, with 600 kHz fixed frequency, current mode and on/off control. Its ultra-low quiescent and dropout operate from 2.5V to 40V, making it suitable for a wide variety of applications.

Application Field

The MIC29150-12WU-TR is typically used in USB power regulation where its voltage regulation range can be dynamically adjusted to meet fast charging requirements. It can also be used in cellular base station RF power amplifiers, where adjustable power rails are needed and serve as an ideal choice due to its high efficiency and fast on/off response time. In addition, it can be used in VoIP Power Supplies and power backup systems, where high reliability is needed and overall system performance is improved.

Working Principle

The MIC29150-12WU-TR works on the basis of pulse-width modulation (PWM) control. It stores energy in an internal inductor and then discharges it whenever the output voltage drops below a preset voltage. The switching frequency is controlled by a detecting circuit which monitors the output voltage. The frequency can be adjusted externally using a current source.The MIC29150-12WU-TR features two error amplifiers and an output current sense circuit. The two error amplifiers are used to compare the output voltage to a reference after adjusting the PWM ratio. The output current sense circuit monitors the output current and takes action accordingly when the current approaches the current limit. In order to reduce power dissipation, the output voltage is typically adjusted to a lower voltage when the load current is out of the normal range.

Conclusion

The MIC29150-12WU-TR is a high efficiency, adjustable step-down switching voltage regulator that is capable of supplying up to 30 watts of power. It is suitable for a wide variety of applications due to its adjustable output voltage range, high efficiency and fast on/off response time. It works on the basis of pulse-width modulation (PWM) control and features two error amplifiers and an output current sense circuit for monitoring the output voltage and current respectively.

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