MIC94345-4YCS TR

Current - Output:	500mA
Base Part Number:	MIC94345
Supplier Device Package:	6-WLCSP (0.84x1.32)
Package / Case:	6-UFBGA, WLCSP
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature
Control Features:	Enable
PSRR:	85dB ~ 50dB (100Hz ~ 5MHz)
Current - Quiescent (Iq):	250µA
Series:	Ripple Blocker™
Voltage Dropout (Max):	0.2V @ 500mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	1.2V
Voltage - Input (Max):	3.6V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

The MIC94345-4YCS TR is a Linear Low Dropout Regulator (LDO) manufactured by Micrel Inc. The device is a voltage regulator, designed to provide a regulated output voltage with low dropout (LDO) performance in an ultra-small package. The device is ideal for applications requiring space-savings, low quiescent current, weight reduction and minimal heat dissipation, such as portable phones and computers, drivers for LEDs, displays, and other battery powered products.

Application Field

The MIC94345-4YCS TR is designed for use in a wide range of applications where an ultra-low quiescent current (< 10 uA) and small size (<3 mm x 3mm DFN package) are essential. Examples include portable phones and computers, where low dropout performance coupled with low quiescent current are essential, as well as LED, display, and other battery powered products.The device is capable of providing a very low quiescent current with a dropout voltage of less than 0.75V. This feature makes the MIC94345-4YCS TR an ideal voltage regulator for applications that require an ultra-low quiescent current at low output voltages (1.5V to 3.3V). In addition, the MIC94345-4YCS TR is designed for use in applications requiring an extremely small size. The device is packaged in a 3 mm x 3mm DFN package, making the device suitable for space-limited applications. The MIC94345-4YCS TR is also capable of operating over a wide input voltage range (1.8V to 5.5V ), making it suitable for automotive and battery-powered applications.

Working Principle

The MIC94345-4YCS TR is a linear voltage regulator, meaning it uses a voltage regulator circuit to maintain its output voltage. The output voltage is regulated by controlling the current that is passed through an internal series pass transistor.When an input voltage is applied to the device, a reference voltage is generated at the control terminal. This reference voltage is compared to an adjustable reference voltage at the feedback terminal, which is adjusted by an external resistor divider. If the voltage at the feedback terminal is higher than the reference voltage at the control terminal, the output voltage of the device is adjusted by controlling the current that passes through the pass transistor.The voltage regulation accuracy of the MIC94345-4YCS TR is determined by the ratio of the external resistor divider values. The resistor divider values determine the setpoint voltage, which is the voltage at the feedback terminal when the device is enabled. The resistor divider values are adjusted to achieve the desired output voltage.

Conclusion

The MIC94345-4YCS TR is an ideal voltage regulator for applications requiring an ultra-low quiescent current with minimal heat dissipation, an extremely small size, and an adjustable output voltage. The device is capable of delivering an output voltage with an accuracy of up to 2%, and has a quiescent current of less than 10 uA. The device is also suitable for automotive and battery-powered applications due to its input voltage range of 1.8V to 5.5V.

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