MIC29151-3.3WU-TR

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MIC29151-3.3WU-TR SMPS

The MIC29151-3.3WU-TR is a high-efficiency step-down SMPS (Switch Mode Power Supply) that features a wide input voltage range of 1.25V to 5.5V. Its low output voltage of 3.3V makes it ideal for applications that require precise voltage regulation within small form factor products. It has a high efficiency of 80% and very high switching frequency of 2 MHz, which reduces the size of external components while minimizing power dissipation.

Features

• Input voltage range: 1.25V to 5.5V
• Low output voltage of 3.3V
• High efficiency of 80%
• High switching frequency of 2 MHz
• 500mA current rating
• Thermal shutdown circuitry
• Compact size 8-pin SOP package

Applications

The MIC29151-3.3WU-TR is ideal for applications where precise voltage regulation is required in a small form factor. These applications include PCs, peripherals, field electronics, and mobile communication devices. It has a low quiescent current of 5 μA and is capable of operating over a wide temperature range of -40°C to +85°C. This makes it well suited for automotive, industrial, and communications applications.

Working Principle

The MIC29151-3.3WU-TR operates by using a very high switching frequency of 2 MHz. This feature helps to reduce the size of external components while minimizing power dissipation. The device uses a buck topology with peak-current-mode (PCM) control. This ensures that the output voltage remains relatively constant, even under varying operating conditions.

The MIC29151-3.3WU-TR has two integrated voltage references on chip. The first is an 0.8V band-gap voltage reference providing a V_REF which is used in the current comparator for setting the current limit. The second is a 0.4V band-gap voltage reference which provides a V_LEVEL reference for setting the softstart time.

The output voltage of the MIC29151-3.3WU-TR is controlled by an error amplifier. This amplifies the difference between the output voltage and the reference voltage. This is then fed to the current-sense comparator, which compares the difference between the sensed output current and the current limit set by the internal 0.8V reference. If the sensed output current is higher than the set current limit, the pulse width modulator (PWM) is disabled, thus controlling the output voltage.

When the power switch is disabled, the controller enters low-power mode, in which the output voltage is regulated without switching. This feature can be used in applications to reduce power consumption in low-power operating modes.

Conclusion

The MIC29151-3.3WU-TR is an excellent choice for applications requiring precise voltage regulation in a small form factor with a wide input voltage range. It features a high efficiency of 80% and very high switching frequency of 2 MHz. The device uses peak-current-mode control and has two integrated voltage references for setting the current limit and softstart time. It also has a low quiescent current of 5μA and is capable of operating over a wide temperature range of -40°C to +85°C, making it ideal for automotive, industrial and communications applications.

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