MIC29300-3.3BU

Voltage Dropout (Max):	0.6V @ 3A
Base Part Number:	MIC29300-3.3
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:	3A
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	3.3V
Voltage - Input (Max):	26V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tube

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Introduction

The MIC29300-3.3BU is a Linear Voltage Regulator (LVR) belonging to the Power Management Integrated Circuit (PMIC) family. It is used primarily as a battery backup supply, providing a steady output voltage while maintaining a long hold up time. The MIC29300-3.3BU is specifically designed to regulate 3.3V input voltages, and can output a maximum voltage of 26.5V.

Features

The MIC29300-3.3BU includes a wide range of features which make it particularly well suited for its stated application field, including:

• 6-pin SOT-23 package
• Adjustable voltage from 0.8V to 26.5V
• Low quiescent current: 1mA (typical)
• Current limited protection
• Independent bias for internal logic
• Power switch output
• Temperature-compensated voltage reference
• Shutdown control circuits

Application Field

The MIC29300-3.3BU is intended for use in applications which require a 3.3V input and an adjustable output voltage of up to 26.5V. Typical applications include:

• Automotive systems
• Cell phones, pagers and other wireless applications
• Portable medical equipment
• Consumer electronics
• Industrial control circuits

As the MIC29300-3.3BU is an LVR, it can be used as a battery backup supply, providing a steady output voltage in the event of an interruption to the main power supply. The device is also suitable for use in low power applications such as logic circuits, displays and low power motors.

Working Principle

The MIC29300-3.3BU is designed to regulate an input voltage of 3.3V, providing an adjustable output voltage up to a maximum of 26.5V. The device operates by using an internal voltage reference and Linear Transconductance Amplifier (LTA) to monitor the desired output voltage. When power is supplied to the device, the LTA monitors the output voltage and the output is adjusted accordingly by adjusting the MOSFET gate voltage, and hence controlling the drain current. This results in the output voltage being held constant.The device is also equipped with a number of protection circuits which are designed to prevent over voltage, over current, and thermal shutdown.

Conclusion

The MIC29300-3.3BU Linear Voltage Regulator is a PMIC device which is used primarily as a battery backup supply. With the ability to regulate an input voltage of 3.3V, and output a maximum voltage of 26.5V, the device is well suited for use in a wide range of applications. The MIC29300-3.3BU also includes a range of integrated protection circuits which are designed to protect the device from over voltage, over current and thermal shutdown.

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