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U1 refers to the MT3608 High Efficiency 1.2MHz 2A Step Up Converter. Here are some key features and specifications:
It has an integrated 80m $\Omega$ Power MOSFET[9].
The input voltage range is 2V to 24V[9].
It operates at a fixed switching frequency of 1.2MHz[9].
The internal switch current limit is 4A[9].
The output voltage is adjustable and can go up to 28V[9].
It has an automatic pulse frequency modulation mode at light loads[9].
The efficiency can reach up to 97%[9].
It is available in a 6-Pin SOT23-6 Package[9].
The device includes under-voltage lockout, current limiting, and thermal overload protection to prevent damage in the event of an output overload[9].
The absolute maximum ratings for the device are: IN, EN voltages: $-0.3 \mathrm{~V} $ to $26 \mathrm{~V} $, FB Voltages: $-0.3 \mathrm{~V} $ to $6 \mathrm{~V} $, SW Voltage: $-0.3 \mathrm{~V} $ to $30 \mathrm{~V} $, Peak SW Sink and Source Current: 4A[10].
The output voltage can be set using a resistor divider, $\mathrm{R} 1$ and $\mathrm{R} 2$ to the FB pin. The output voltage is given by VOUT =VREF×(1+R2R1) where the internal reference VREF is 0.6V (Typical)[11].
The MT3608 is a high efficiency DC-DC step-up converter IC designed by Airoha Technology. It is capable of driving a 4A load with excellent line and load regulation.
Key Features:
Input Voltage Range: 2.0V to 24V
Output Voltage: Up to 28V (adjustable)
Switch Current: Up to 4A
Efficiency: Up to 93%
Fixed Frequency: 1.2MHz
Built-in soft start function to limit inrush current.
Built-in over temperature protection and current limit functions.
Applications:
Battery Powered Devices
Wireless Communication Power Supplies
5V to 12V /24V Power Converters
Portable Devices
This IC is commonly used in modules that step-up voltage for different applications. It's used where the input power source is lower than required, such as battery-powered devices, portable devices, etc.
For the detailed specifications, operation, and application circuits, you can refer to the MT3608 Datasheet.
The MT3608 is a high-efficiency, 1.2MHz, 2A step-up converter from Aerosemi. Here are some of its key features and specifications:
It has an integrated 80m $\Omega$ Power MOSFET[9].
The input voltage range is 2V to 24V[9].
It operates at a fixed switching frequency of 1.2MHz[9].
The switch current limit is internally set to 4A[9].
The output voltage is adjustable and can go up to 28V[9].
It has an automatic pulse frequency modulation mode at light loads[9].
It can achieve up to 97% efficiency[9].
It is available in a 6-Pin SOT23-6 package[9].
It includes under-voltage lockout, current limiting, and thermal overload protection to prevent damage in the event of an output overload[9].
The absolute maximum ratings for the IC are: IN, EN voltages: $-0.3 \mathrm{~V} $ to $26 \mathrm{~V} $, FB Voltages: $-0.3 \mathrm{~V} $ to $6 \mathrm{~V} $, SW Voltage: $-0.3 \mathrm{~V} $ to $30 \mathrm{~V} $, Operating Temperature: $-40^{\circ} \mathrm{C} $ to $+85^{\circ} \mathrm{C} $, Junction Temperature: $.160^{\circ} \mathrm{C} $, Storage Temperature Range: $-65^{\circ} \mathrm{C} $ to $150^{\circ} \mathrm{C} $, Peak SW Sink and Source Current: 4A, Lead Temperature (Soldering, $10 \mathrm{~s} $): $+300^{\circ} \mathrm{C} $[10].
The output voltage can be set using a resistor divider, with the formula: VOUT =VREF×(1+R2R1) where $V_{R E F} $ is the internal reference voltage of 0.6V[11].
For best performance, it is recommended to use input and output ceramic capacitors of $22 \mu \mathrm{F} $, an inductor with values between 4.7 to $22 \mu \mathrm{H} $, and a Schottky diode due to its low forward voltage drop and fast reverse recovery[12].
The layout of the IC should be carefully considered for optimal performance, including keeping main current traces short and wide, placing feedback components close to the IC, and ensuring the GND is connected to a strong ground plane for heat sinking and noise protection[13].
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