MIC2145BML

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MIC2145BML Application Field and Working Principle

The MIC2145BML is a DC-DC switching regulator belonging to the variety of the DC-DC switching regulators. It is manufactured by Micrel Inc., a leader in power management and integrated circuits. With its advanced features, this regulator is suitable for a wide variety of applications ranging from portable electronics to industrial applications.

The MIC2145BML DC-DC Switching Regulator supports a wide input voltage range from 4.5V to 36V and integrates a high-side power MOSFET, a low side power MOSFET and a charge pump. It offers up to 1.2A output current or up to 2.1A of peak current in a tiny space-saving 8 pin TSOT-23-5 package. It is an alternative to the fixed output space-saving LDOs and can easily be used in various applications such as automotive, battery powered wireless communication, LED lighting and portable electronic devices.

Outstanding Features of MIC2145BML

• High precision - 125 mV min output voltage accuracy
• Wide 4.5V to 36V input voltage range
• High-efficiency synchronous mode - up to 96%
• Low-ripple mode - up to 1MHz switching frequency
• External compensation to optimize load and line
• Dynamic response ratio to modify the output voltage
• Large load current capability - up to 1.2A
• IPW2228 Low EMI Filtering
• AEC-Q100 robustness qualification
• Packaged in small Space-saving 8-pin TSOT-23-5

Application Field

The MIC2145BML series can be used in many different types of applications due to its broad input voltage range, adjustable output voltage and wide current capability. It is suitable for automotive, lighting and portable electronic devices.

For automotive applications, the MIC2145BML is well suited for high-power systems such as vehicle mirror heating and air conditioning systems. It can be used for LED lighting systems with high power efficiency which is required for illumination.

For portable electronic devices, the MIC2145BML is an alternative to the fixed output LDOs and offers lower power consumption. It is suitable for battery powered wireless communication such as cell phones, Bluetooth and wireless headsets.

How Does It Work?

The MIC2145BML is a synchronous DC-DC switching regulator providing a simple and compact solution capable of supplying up to 1.2A of load current. The MIC2145BML operates in switching mode and follows the following steps:

1. The internal high-side power MOSFET (switching device) is turned on by the signal of the internal oscillator.
2. The signal of the oscillator causes the high-side power MOSFET to turn on, which in turn turns on the low-side MOSFET.
3. When both MOSFET\'s are turned on, the voltage is dropped across the power MOSFET\'s and the current flows from the input to the output, providing a regulated output voltage.
4. Once the current reaches the maximum value specified in the register, the oscillator signal changes and powers the page (output) remains constant.

The MIC2145BML switches at a frequency adjustable up to 1MHz in order to lower the EMI generated. Additionally, it has integrated loop compensation components that improve regulation and enable the output voltage to be programmed accurately.

The MIC2145BML is designed to be robust and has been qualified according to AEC-Q100. It is an ideal solution for cost-sensitive applications, such as smartphones, digital still cameras and tablet PCs.

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