CXSU63220 is a built-in 90 Mohm N-channel MOSFETs synchronous boost converter, the input voltage range covers 2V to 6V, the maximum output voltage can reach 6V, support continuous 4A switching current. The device adopts a fixed 1MHz switching frequency, which not only effectively reduces the size of peripheral inductance and capacitance, but also significantly reduces the occupied area of the overall scheme. The soft start circuit is integrated internally to effectively suppress the surge current during startup and improve the reliability of the system.
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CXSU63220: efficient and integrated boost converter helps power supply design of portable devices
With the rapid development of portable electronic devices, the performance of power management chips directly affects the endurance, volume and stability of products. As a Boost CXSU63220 converter with high performance and current mode control, DC-DC has become an ideal power supply solution for single lithium ion battery power supply equipment due to its high integration, high efficiency and small size package. This article will comprehensively analyze the technical characteristics, typical applications and design points of CXSU63220 to help engineers achieve more compact and efficient power supply design.
I. Product Overview
CXSU63220 is a built-in 90 Mohm N-channel MOSFETs synchronous boost converter, the input voltage range covers 2V to 6V, the maximum output voltage can reach 6V, support continuous 4A switching current. The device adopts a fixed 1MHz switching frequency, which not only effectively reduces the size of peripheral inductance and capacitance, but also significantly reduces the occupied area of the overall scheme. The soft start circuit is integrated internally to effectively suppress the surge current during startup and improve the reliability of the system.
Second, core features
• Wide input voltage range: 2V-6V, perfect match for single lithium ion battery applications.
• High switching frequency: 1MHz fixed frequency, support small inductance and capacitance.
• Low on-resistance: Built-in 90 Mohm MOSFETs to improve conversion efficiency.
• Large current output: The internal switch supports 4A output to meet the needs of most portable devices.
• Comprehensive protection mechanism: it has over-temperature protection and over-current protection to ensure the safe operation of the system.
• Low quiescent current: the typical value is 100μa, which remains efficient at light load.
• Small size package: DFN3x3-10 package, suitable for space-limited design.
• Environmental Compliance: RoHS compliant, halogen-free design.
Third, typical application scenarios
CXSU63220 is widely used in the following areas:
•Single lithium ion battery power supply equipment
•Portable Medical Equipment
•Bluetooth headset, smart watch and other wearable products
•Mobile power supply, handheld terminal
•IoT sensor module
IV. Electrical characteristics and performance advantages
Under typical conditions of input 3V, output 5V, and load 1A, CXSU63220 performs well:
•High accuracy of feedback reference voltage: 0.6V ± 2%
•Starting voltage threshold: 1.9V (typical)
•Thermal shutdown temperature: 150℃
•Enable pin threshold: rising edge 1.5V, failling edge 0.4V
•The shutdown current is lower than 10μa, which greatly prolongs the battery life.
Its efficiency remains above 90% under the conditions of 3.3V to 5V and 1.5A load, showing excellent energy utilization efficiency.
V. Design guide and Peripheral Component selection
5.1. Feedback resistance voltage dividing Network (R Ohm, R Ohm)
The output voltage is set by external divider resistance. The formula is as follows:
We recommend that you set the values of R and R to 10 kΩ-1 MOhm to reduce light load power consumption. If R = 200kΩ is selected, R = can be calculated:
5.2. Input capacitor (CIN)
We recommend that you use 22μF low-ESR ceramic capacitors close to VDD and GND pin layouts to reduce loop area and noise.
5.3. Output capacitor (COUT)
In order to meet the requirements of ripple and transient response, it is recommended to use two 22μf, X7R or better ceramic capacitors.
5.4. Boost inductor (L)
Inductance value affects ripple current. We recommend that you calculate it according to the following formula:
The inductor saturation current must be greater than the peak current, and DCR is recommended to be lower than 10 MOhm to maintain high efficiency.
5.5. Rectifier diode
We recommend that you use a Schottky diode. Its low voltage drop and fast recovery feature help improve efficiency.
VI. Layout suggestions
Good PCB layout is the key to ensure performance:
•The input capacitor should be close to the VDD and GND pins.
•The copper area of LX node should be as small as possible to reduce low noise radiation.
•The feedback network is far away from LX nodes to avoid noise coupling.
•Use large-area ground connection to improve heat dissipation and anti-interference capability.
•If the EN pin is suspended, we recommend that you use an external 1 Mohm pull-down resistor to prevent false triggering.
VII. Packaging and supply information
CXSU63220 adopts DFN3x3-10 package, which is small in size and excellent in heat dissipation. It supports tape package (5000 PCs per roll), which is convenient for automatic production.
VIII. Conclusion
With its high integration, high efficiency and perfect protection function, CXSU63220 has become an ideal choice for the design of boost power supply in portable devices and battery power supply systems. No matter in wearable devices, mobile terminals or Internet of Things applications, its excellent performance and reliability can meet the high requirements of modern electronic devices for power supply. For more technical information, samples or support, please visitJTM-IC official websiteLearn More
