MIC7401YFL-T5

Voltage - Output (Min/Fixed):	1.05V, 1.1V, 1.25V, 1.8V, 12V
Base Part Number:	MIC7401
Supplier Device Package:	36-FQFN (4.5x4.5)
Package / Case:	36-VFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	2MHz
Current - Output:	200mA, 3A
Voltage - Output (Max):	--
Series:	HyperLight Load®
Voltage - Input (Max):	5.5V
Voltage - Input (Min):	2.4V
Number of Outputs:	6
Output Type:	Programmable
Topology:	Buck, Boost
Output Configuration:	Positive
Function:	Step-Up, Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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MIC7401YFL-T5 Application Field and Working Principle

Introduction

The MIC7401YFL-T5 is a current mode, step-down DC-DC switching regulator, supplied in a 5-pin SOT-23 package. It is designed for low voltage, high current applications, such as PC/notebook power supplies, USB active cables and PDAs. The piece offers wide input voltage range, fast transient response and low ripple operation for demanding applications.

Application Field

The MIC7401YFL-T5 is basically designed for PC/notebook power supplies, USB active cables and PDAs. Its wide input voltage range of 2.5V-20V makes it suitable for a variety of different applications. It is also able to operate as a voltage doubler, triple- or quad-hall converter by adding additional components. The MIC7401YFL- T5 can also be used to power up multiple outputs. For example, it can be used to generate two 3.3V outputs and one 1.8V output.

Working Principle

The MIC7401YFL-T5 is a current mode, step-down, non-synchronous switching regulator. The regulator consists of an internal high-side P-Channel MOSFET, which is used to switch the input voltage from the power source, and an external N-Channel Mosfet, which regulates the output voltage. The output voltage is regulated by sensing the output voltage of the power source, and by comparing it to the desired output voltage. This comparison is done by the Internal error amplifiers. When an over- or undershoot is detected, the Pulse Width Modulated (PWM) signal, which is generated by the error amplifier, is used to adjust the duty cycle of the switching regulator. This will in turn adjust the output voltage, so that it corresponds to the desired output voltage. The MIC7401YFL-T5 is able to operate in a wide input voltage range and is able to output a low ripple voltage. The device also features built-in thermal shutdown, Over Voltage Protection (OVP), and under voltage protection (UVP).

Conclusion

The MIC7401YFL-T5 is a current mode, step-down DC-DC switching regulator, supplied in a 5-pin SOT-23 package. Its wide input voltage range, low ripple voltage and fast transient response makes it ideal for PC/Notebook power supplies, USB active cables, and PDAs and other applications. Its current mode control guarantees an exact output voltage during load transients, and its one-time programmable external divider provides an accurate output voltage setting. The piece also offers over-voltage protection (OVP), under-voltage protection (UVP) and thermal shutdown.

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