The CXSD62628 Series are synchronous buck converters with an advanced I² control architecture that provides extremely fast load transient response by monitoring and adjusting inductor current in real time, effectively reducing output capacitance requirements. Two N-channel MOSFET power switches are integrated inside the chip. The on-resistance of the upper tube is only 95 mΩ and the on-resistance of the lower tube is 55 mΩ. High efficiency power conversion can be realized without external Schottky diode.
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[ CXSD62628 ]"
CXSD62628 high-efficiency 2A synchronous buck converter: the perfect balance of small size and high power
With the trend of miniaturization and high efficiency of modern electronic devices, power management chips need to provide higher power density and better dynamic response in a limited space. Jiatem Semiconductor launchedCXSD62628andCXSD62628FThe synchronous buck converter is an advanced power solution designed to meet this need. Using innovative I control architecture and ultra-compact SOT563 package, the two chips provide up to 2A continuous output current in a wide input voltage range of 4.5V to 18V, with an efficiency of up to 95%, which is especially suitable for application scenarios with strict requirements on space and efficiency.
Product Overview and Core Benefits
The CXSD62628 Series are synchronous buck converters with an advanced I² control architecture that provides extremely fast load transient response by monitoring and adjusting inductor current in real time, effectively reducing output capacitance requirements. Two N-channel MOSFET power switches are integrated inside the chip. The on-resistance of the upper tube is only 95 mΩ and the on-resistance of the lower tube is 55 mΩ. High efficiency power conversion can be realized without external Schottky diode.
The series offers two light-load operating modes to choose from:CXSD62628Using PFM mode, the switching frequency is automatically reduced at light load to maintain high efficiency;CXSD62628FThe FCCM mode is used to maintain fixed frequency operation in the full load range, which is suitable for noise-sensitive applications. Both chips use a fixed switching frequency of 600kHz for the best balance between performance and size.
Key characteristics and technical parameters
Wide Pressure Input and Precision Output
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Input voltage range4.5V to 18V, compatible with multiple power standards
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Output voltage range: 0.8V to VIN×Dmax, meeting various low-voltage core power requirements
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Feedback voltage accuracy: 0.8V ± 1% (normal temperature),± 2% (full temperature range)
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Maximum output current2A continuous current to meet the power supply needs of most processors and peripherals
High efficiency and low power consumption
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Peak Efficiency: Up to 95%, reducing system heat consumption
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Quiescent current: Typical value of 150 μA, optimized light load efficiency
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turn-off current:<1μA, greatly extending battery life
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Internal Soft Start1.4ms typical start-up time to prevent inrush current
comprehensive protection mechanism
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Output short circuit protection2048 cycle detection 6144 cycle hiccup mode, automatic recovery
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Current runaway protection: Valley current limit to ensure safe start-up
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Input Undervoltage Lockout: 4.2V typical opening threshold, 350mV return difference
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over-temperature protection: 160°C shutdown, 140°C recovery, prevent thermal damage
Typical application scenarios
With its excellent performance and compact package, the CXSD62628 series is suitable for a variety of modern electronic equipment:
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distributed power systemwithnetwork communication equipment
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FPGA、DSP、ASICprocessor core power
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LaptopwithTablet PCAuxiliary power supply
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green electronic productswithSmart Home Appliances
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industrial control systemwithPortable instrument
Design Guide and Component Selection
Output voltage setting
The output voltage is set by the external divider resistor on the FB pin and is calculated as follows:
RH = RL × (Vout/0.8 & minus;1)The recommended value of RL is 10kΩ, which can be adjusted according to actual needs.
Input capacitance selection
The input capacitor needs to provide sufficient ripple current capability. It is recommended to use a 22 μF/25V ceramic capacitor and place it as close as possible to the VIN and GND pins of the chip. the formula for the calculation of the ripple current:
Output inductance calculation
The inductance value affects the ripple current and efficiency, and the recommended calculation formula is:
Where & Delta;IL is usually set to 30%-40% of the output current, and the recommended inductance value is 4.7μH to 10μH.
bootstrap capacitance
A 0.1μF low ESR ceramic capacitor needs to be connected between the BST and SW pins to provide enough energy for the high-side drive.
Key Points of PCB Layout
Optimized PCB layout is critical to switching power supply performance:
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Input decoupling capacitorshould be closest to the VIN and GND pins, resulting in minimum loop area
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Feedback routingShould be short and direct, away from noise sources such as inductors and SW nodes
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ground planeShould be as complete as possible to provide good heat dissipation and noise shielding
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Power supply wiring(VIN, VOUT, SW) should be wide and short to reduce parasitic resistance
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SW nodeArea should be minimized to reduce EMI radiation
Package Information and Reliability
The CXSD62628 series is available in an ultra-compact SOT563 package (1.6mm × 1.6mm), providing excellent thermal performance in a very small footprint. All products comply with RoHS standards, use lead-free and halogen-free materials, and pass strict reliability tests to ensure stable operation in the junction temperature range of -40°C to 125°C.
Conclusion
With its innovative I² control architecture, efficient power conversion and comprehensive protection features, Gateam's CXSD62628 series of synchronous buck converters provide an ideal high-density power supply solution for modern electronic equipment. Whether it is a portable device with limited space or a processor that requires strict dynamic response, this series of chips can provide excellent performance and reliability. For detailed technical documentation, reference designs or sample applications, please visit the official website of Gateam:jtm-ic.com.
