The CXSD62687 is a fully integrated current mode control synchronous step-down DC/DC converter that can operate over a wide input voltage range of 4.5V to 16V and provide up to 2A of continuous output current. Its output voltage can be as low as 0.6V, making it ideal for powering modern low-voltage, high-performance processors, ASICs and memory. The chip uses a compact SOT23-6 package, and built-in complete control logic, drivers and protection circuits, greatly simplifying system design.
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[ CXSD62687 ]"
In the pursuit of high energy efficiency and high reliability of modern electronic systems, an excellent buck converter is the key to ensure the stable operation of the core chip. JTM-IC (jtm-ic.com) launchedCXSD62687It is a set.High efficiency, high integration and excellent dynamic performancein one body2A Synchronous Rectification Buck Converter. It is designed for distributed power system, digital consumer electronics and network equipment design, with its simple peripheral, powerful protection function and stable output, become the ideal choice for engineers to deal with the challenge of power buck.
1. CXSD62687 Product Core Overview
CXSD62687 is a fully integratedCurrent Mode ControlSynchronous step-down DC/DC converter, which can be used in4.5V to 16Voperates over a wide input voltage range and provides up2Acontinuous output current. Its output voltage can be as low0.6VIdeal for powering modern low-voltage, high-performance processors, ASICs and memory. The chip uses a compactSOT23-6 packageAnd built-in complete control logic, driver and protection circuit, greatly simplifying the system design.
2. superior performance and key technical features
2.1. Industry-leading efficiency: Benefit fromSynchronous Rectification Architecture(without an external Schottky diode) and as low90m Ω/70mΩThe upper and lower tube on-resistance of the CXSD62687 can be achieved in typical applications.Up to 96% conversion efficiencyEffectively reduce the temperature rise of the system and extend the life of the equipment.
2.2. Intelligent dual-mode control: Chip AdoptionAutomatic switching between PWM (pulse width modulation) and PFM (pulse frequency modulation)Technology. Maintain 600KHz fixed frequency PWM mode at heavy load to achieve excellent voltage stabilization performance; automatically switch to PFM mode at light load to significantly reduce switching losses, thusMaintain high efficiency throughout the load range.
2.3. Excellent dynamic response.: AdoptCurrent Mode Control with Slope Compensation, provides excellentLine and Load Transient Response. Internal integrated compensation network, without the need for external complex compensation components, can be used inLow ESR Ceramic Output CapacitorKeep the loop stable and simplify the design.
2.4. Comprehensive integrated protection.：
· Hiccup mode overcurrent protection: When the output continues to be short-circuited, the chip enters the "hiccup" mode of periodic restart, which reduces the average short-circuit current to a very low level, effectively preventing overheating and damage.
Internal soft start: Fixed1msThe soft start time limits the starting impulse current and prevents the output voltage from overshooting.
· Thermal Shutdown Protection: junction temperature exceeds160°CWhen the automatic shutdown, the temperature falls back after the recovery, to ensure the safety of the chip.
· Input Undervoltage Lockout: Make sure that the input voltage is sufficient before starting to work.
2.5 low static power: Quiescent current in shutdown mode only1μA, Ideal for battery-powered or applications that require low standby power consumption.
3. a wide range of target applications
With its wide input range, 2A output capability, high efficiency and excellent reliability, the CXSD62687 is perfect for the following scenarios:
· Consumer Digital Products：Digital set-top box (STB), flat panel TV, LCDmotherboard and core chip power supply.
· Network and Communication Equipment：Wireless router, DSL/fiber modem, switchProcessor, PHY chip power supply in.
· Computers and Peripherals：LaptopThe auxiliary power rail, USB Hub power supply, external hard disk power supply, etc.
· Industrial and Embedded Systems: Industrial control motherboard, single board computer, test equipment in need of efficient buck occasions.
· Distributed power architecture: As an intermediate bus converter, convert the 12V or 5V bus to a lower voltage rail.
4. detailed design guide and peripheral component selection
To help engineers realize the full potential of their CXSD62687, JTM-IC provide the following validated design recommendations:
4.1 Output voltage setting：
The output voltage is set by a resistive divider connected between the output and ground. Select R1 to be approximately100kΩ(To obtain the best transient response),R2 can be calculated by the following formula:
It is recommended to use1% accuracyresistance to ensure output voltage accuracy.
4.2 Power Inductor Selection：
The recommended inductance value range is4.7 μH to 22 μH. The rated current of the inductor shall be at least greater than the maximum load currentHigh 25%Above, DC resistance is recommendedLess than 15mΩto improve efficiency. The formula for calculating the peak inductor current is:
Where the ripple current & Delta;I _L is recommended to be set to the maximum load current30%Left and right.
4.3 Input capacitance selection：
Place a pin near the VIN pin22μFA low ESR ceramic capacitor (X5R/X7R material is recommended) or above is used to filter out high-frequency switching noise and provide transient current for the chip. The RMS current rating of the capacitor shall meet the requirements.
4.4 Output capacitance selection：
Ceramic, tantalum or low ESR electrolytic capacitors may be used.Low ESR ceramic capacitors are preferred, can effectively reduce the output ripple. The output ripple voltage can be estimated by the following formula (when ceramic capacitors are dominant):
Among them, FSW= 600kHz. According to the ripple requirements to choose the appropriate capacity, usually22 μF to 100 μFThe ceramic capacitors are available for most applications.
4.5 bootstrap capacitance: A must be connected between the BS and SW pins0.1μFof ceramic capacitors.
4.6 The golden rule of PCB layout：
· Minimization of power loop: input capacitor, VIN/SW pin of the chip and groundHigh frequency switch loopIt must be as small as possible, with short and wide traces to reduce parasitic inductance and EMI.
· Grounding and heat dissipation: Provide a large area grounding copper foil for the GND pin, and it is well connected to the ground terminal of the input/output capacitor. Use PCB copper foil to dissipate heat from the chip and improve long-term reliability.
• Protection of the feedback network: FB pin ishigh resistance anti-sensitive node. Feedback resistors R1, R2 shall beAs close as possible to the FB pinPlaced, the traces are short and away from noise sources such as inductors and SW nodes.
· Component layout: The input bypass capacitor should be close to the VIN pin. Designing with reference to the layout example in the data sheet (Figure 3) is a shortcut to best performance.
5. Package Information and Product Reliability
CXSD62687 industry-standardSOT23-6 package, Provides powerful power handling capabilities in a very small footprint. JTM-IC strictly implement the quality control system to ensure that the products in-40°C to 85°CStable operation over a wide temperature range to meet the reliability requirements of consumer-grade to industrial-grade applications.
Why do 6. choose JTM-IC and CXSD62687?
JTM-IC is always committed to providing customers with high-performance, high-reliability power management solutions. CXSD62687 embodies ourHigh-performance synchronous step-down technologyDeep accumulation on:
· Balance between performance and cost: While providing up to 96% efficiency, the total system cost and PCB area are reduced through high integration.
· Design friendlinessInternal compensation, dual-mode control, and comprehensive protection allow engineers to complete power supply design more quickly and robustly.
· Reliable quality assuranceEach chip has undergone rigorous testing and verification to ensure long-term stable operation in various application environments.
7. epilogue
The CXSD62687 is to connect the medium voltage input with the low voltage high current loadEfficient and Reliable Bridges. Whether you are designing a next-generation high-definition set-top box, a smart TV, or a high-performance network communication device, it can use itsSuperior efficiency, robust protection and simplified designBe the trusted core of your power system.
Visit the official JTM-IC website immediately (jtm-ic.com）Get the CXSD62687's complete data sheet, detailed application notes, SPICE models, PCB layout reference documents, and application samples. Our professional technical support team is on standby to provide you with strong support from concept design to mass production. Choose JTM-IC to create more efficient and reliable electronics.
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