In modern portable electronic devices, the performance of the power management chip directly affects the endurance, size and stability of the device. CXSU63308 is a constant frequency boost converter designed for low power consumption and small volume applications. It adopts peak current mode control architecture, integrates 0.5Ω power MOSFET, and has a switching frequency of up to 1.2MHz. It is suitable for OLED bias, LCD bias, white LED driver, PDA, digital camera and other portable devices. The chip uses a 5-pin SOT23-5 package, which is small in size and suitable for space-constrained design scenarios.
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[ CXSU63308 ]"
CXSU63308: high performance, high efficiency boost converter chip
In modern portable electronic devices, the performance of the power management chip directly affects the endurance, size and stability of the device. CXSU63308 is a constant frequency boost converter designed for low power consumption and small volume applications. It adopts peak current mode control architecture, integrates 0.5Ω power MOSFET, and has a switching frequency of up to 1.2MHz. It is suitable for OLED bias, LCD bias, white LED driver, PDA, digital camera and other portable devices. The chip uses a 5-pin SOT23-5 package, which is small in size and suitable for space-constrained design scenarios.
Overview of 1. CXSU63308 core features
· Wide input voltage range: 2.5V to 5.5V, suitable for a variety of battery-powered systems.
· Adjustable output voltage: Up to 28V, meeting high-voltage bias requirements.
· Efficient operation: Automatically switch to pulse frequency modulation mode when light load, the efficiency of the whole machine exceeds 85%.
· Low quiescent current: Only 40μA, greatly extending battery life.
· High degree of integration: Built-in power MOSFET, soft start, overcurrent protection, overheat protection and undervoltage lockout functions.
· Small package: SOT23-5 package, height less than 2mm, suitable for light and thin equipment.
2. typical application scenarios
CXSU63308 are widely used in the following areas:
· OLED and LCD Bias Power Supplies: Provide stable high-voltage bias for the display.
· White LED DriverSupport multiple LED series drive, suitable for backlight and lighting.
· Portable Device Power SupplySuch as PDA, digital camera, mobile power, etc.
· Low Power Sensor Powered: Suitable for IoT devices and wearable devices.
3. electrical characteristics and performance
The typical electrical parameters of the CXSU63308 at 3.7V input and 25 ℃ are as follows:
· Switching frequency: 1.2MHz, supports the use of small inductors and capacitors.
· Feedback voltage: 1.23V, set the output voltage through an external voltage divider resistor.
· Switching current limit: 1.5A, provide reliable overload protection.
· Thermal shutdown temperature: 155 ℃ to prevent the chip from overheating and damage.
· Quiescent current: Only 40 μA in PFM mode, about 0.6mA in PWM mode.
Its performance curve shows that in the 5V input, 10V output, 50mA to 200mA load range, the output voltage is stable, the ripple is small, and the efficiency is high. It is suitable for applications with strict power quality requirements.
4. function description and working principle
The CXSU63308 uses a fixed frequency, peak current control architecture. At the beginning of each oscillation cycle, the internal MOSFET is turned on, the output of the current sense amplifier is compared with the error amplifier, and the MOSFET is turned off when the set value is reached. The system has good load response and stability, and the built-in soft start function can limit the input current and output overshoot during startup.
Under light load conditions, the chip automatically switches to PFM mode to further reduce power consumption, and maintains PWM mode during heavy load to ensure high efficiency and low ripple.
5. Application Design Guide
1. Output voltage setting
Connected to the FB pin via external divider resistors R1 and R2, the output voltage is calculated as follows:
2. Inductance selection
Inductors of 4.7 μH to 22 μH are recommended, with low DC resistance and high saturation current to improve efficiency and prevent magnetic saturation.
3. Capacitance selection
It is recommended to use 1 μF ceramic capacitors for input and output, preferably X5R or X7R materials due to their low ESR and good temperature stability.
4. Diode selection
Schottky diodes are recommended for their low forward voltage drop and fast recovery characteristics to improve overall efficiency. The reverse breakdown voltage of the diode should be higher than the output voltage.
5. PCB Layout Recommendations
· Input and output capacitors should be close to the chip and grounded.
· The ground wire shall be wide and short and shall be connected to a large ground plane.
· SW node wiring should be compact, reduce high frequency noise radiation.
· The feedback element shall be located away from the high frequency switch node and close to the FB pin.
6. Packaging and Mechanical Specifications
The CXSU63308 adopts SOT23-5 package, compact size, suitable for automatic placement. The specific dimensions refer to the packaging drawings in the data sheet and conform to the industry standards for easy integration into various compact designs.
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About JTM-IC
JTM-IC (official website:jtm-ic.com) Focus on the development and sales of high-performance power management chips, providing a full range of power solutions including boost converters, buck converters, LED drivers, etc. CXSU63308 is an efficient and reliable boost chip for portable devices, suitable for all kinds of low voltage to high voltage application scenarios. Welcome to visit our website for more product information, technical support and procurement services.
