CXSD62668 is a high-frequency synchronous buck regulator with current control mode. The input voltage range is 2.5V to 5.5V, and the maximum output current can reach 4A, which is suitable for a variety of low voltage and high current application scenarios. The quiescent current of the device is only 100 µA during operation and less than 1 µA during shutdown, which greatly improves the endurance of battery-powered devices. The internal integration of PWM controller, power switch and compensation network greatly simplifies the external circuit design, and requires only a small number of peripheral components to build an efficient and stable 4A output switching power supply.
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[ CXSD62668 ]"
CXSD62668 synchronous buck converter: High Performance 4A output power solution
Under the background that electronic devices are increasingly pursuing high efficiency, miniaturization and energy saving, the performance of power management chips is particularly critical. As a high-frequency synchronous buck converter, CXSD62668 is an ideal choice for all kinds of portable and embedded systems due to its excellent efficiency and compact design. This article will introduce the features, application scenarios and design points of CXSD62668 in depth to help engineers better understand and apply the device.
I. Product Overview
CXSD62668 is a high-frequency synchronous buck regulator with current control mode. The input voltage range is 2.5V to 5.5V, and the maximum output current can reach 4A, which is suitable for a variety of low voltage and high current application scenarios. The quiescent current of the device during operation is only 100 & micro;A, and it is lower than 1 & micro;A in the shutdown state, which greatly improves the endurance of battery-powered equipment. The internal integration of PWM controller, power switch and compensation network greatly simplifies the external circuit design, and requires only a small number of peripheral components to build an efficient and stable 4A output switching power supply.
Second, the main features
•Wide input voltage range: 2.5V-5.5V, compatible with various power supply environments.
•High output capability: continuous 4A output, suitable for high load applications.
•Excellent efficiency: up to 95% conversion efficiency, reducing energy loss.
•Low power consumption design: Static current 100 & micro;A, shutdown current <1 & micro;A.
•Adjustable output voltage: flexible setting from 0.6V to VIN.
•Fixed switching frequency: 1MHz operating frequency, supporting miniature inductance and capacitance.
•Comprehensive protection mechanism: it has undervoltage lockout (UVLO), overcurrent, short circuit and overheating protection.
•Wide temperature work:-40°C to 85°C, suitable for harsh environments.
•Green Package: DFN3x3-10L lead-free package, RoHS compliant.
Third, typical application fields
CXSD62668 is widely used in the following devices:
•SSD devices
•Tablet PC (PAD)
•Wireless routers and access points
•Notebook Computer and Internet PC
•Server on-board power supply
Its high integration and small package are especially suitable for scenarios with limited space and high energy efficiency requirements.
IV. Design essentials and suggestions
4.1. Output voltage setting
The output voltage can be flexibly set through external divider resistance. The formula is as follows:
We recommend that you use R = 100kΩ to calculate the R value based on the target output voltage.
4.2. Inductance selection
Inductance value affects ripple current. We recommend that you calculate it according to the following formula:
I recommend that you take 30% of the maximum output current. We recommend that you use models such as TDK 653 or WURTH 744777001.
4.3. Input and output capacitors
To reduce ripple, we recommend that you use low-ESR ceramic capacitors. Common configurations are as follows:
•Input: Two 47 & micro;F MLCC or one 100 & micro;F tantalum capacitor and one 47 & micro;F MLCC
•Output: Two 47 & micro;F MLCC
4.4. Layout suggestions
•The input and output capacitors should be as close to the chip as possible to reduce the loop impedance.
•Use large area grounding layer to ensure that all ground wires are well connected.
•FB voltage dividing network should be far away from switching nodes to avoid noise interference.
•Switch nodes should be wired with low impedance to reduce losses.
•The bottom heat dissipation pad (EP) must be connected to a large area of copper cover to improve the heat dissipation performance.
V. Protection and reliability
CXSD62668 built-in protection features:
• Cyclic current limit: prevent overload damage.
• Frequency Switchback: automatically drops to 220kHz in the short circuit state to reduce power consumption.
• Thermal shutdown: The output is automatically turned off when the junction temperature exceeds 160°C.
6. Encapsulation information
The device is packaged in DFN3x3-10L, with compact size and excellent heat dissipation performance, which is suitable for high-density PCB layout.
VII. Conclusion
With its high efficiency, high integration and comprehensive protection function, CXSD62668 has become the preferred solution for modern portable and embedded power supply design. Whether it is consumer electronics, network equipment or industrial applications, its excellent performance and reliability can meet the stringent design requirements. For more technical details or samples, please visitJTM-IC official website.
