MIC4690BM

Voltage - Output (Min/Fixed):	1.23V
Base Part Number:	MIC4690
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	500kHz
Current - Output:	1A
Voltage - Output (Max):	27.9V
Series:	SuperSwitcher™
Voltage - Input (Max):	30V
Voltage - Input (Min):	4V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Discontinued at Digi-Key
Packaging:	Tube

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Introduction

The MIC4690BM is a high performance, low power supply current, high efficiency synchronous buck (step-down) DC-DC converter. It is a monolithic device which includes an internal power FET and all associated control elements to form a sub-miniature high-side current source. The IC is ideal for low voltage applications that require high efficiency, and low component count. The MIC4690BM’s low THD, low ripple, and fast transient response makes it an ideal component for battery-powered applications.

Application Field

The MIC4690BM is a versatile voltage regulator for a wide range of applications. It can be used for low power supply applications such as battery-powered devices, automotive, industrial, and consumer electronics. This device is well suited to applications that require high efficiency, low ripple, wide input voltage range, fast transient response, and low noise. It can be used to generate some of the most commonly used processor and memory supply voltages and power logging, storage, and communications applications. The IC is available in a 8-pin Space-saving DSO-8 package and provides a stall-prevention feature. This stall-prevention feature prevents the output from switching when the input voltage is below the under-voltage lockout level of 1.2V. The IC also has an output voltage accuracy of ±1.5% when externally trimmed.

Working Principle

The MIC4690BM is a synchronous buck (step-down) DC-DC converter. It uses two power stages: an internal high-side power FET to provide a high current source and an external low-side power FET to provide a low current sink. The output voltage is set by a resistor divider that is connected to the feedback pin. The voltage across the resistor divider is compared with a reference voltage of 1.5V and the resulting error signal is used to regulate the output voltage. The IC uses built-in current modes control loops, frequency jittering, synchronization, and line compensation to provide excellent transient response and minimal THD. It also features slew rate control to reduce switching noise, a power saving mode to reduce power consumption when in light load conditions, and a low quiescent current of just 8µA.

Conclusion

The MIC4690BM is a high performance, low power supply current, high efficiency synchronous buck (step-down) DC-DC converter. It makes an ideal component for battery-powered applications due to its low THD, low ripple, and fast transient response. The IC is well suited for low voltage applications that require high efficiency and low component count and is available in a 8-pin Space-saving DSO-8 package. It uses current modes control loops, frequency jittering, synchronization, and line compensation to provide excellent transient response and minimal THD. It also features slew rate control to reduce switching noise, a power saving mode, and a low quiescent current.

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