CXSD62629 and CXSD62629F are JTM-IC synchronous buck regulators based on the I² control architecture designed for efficient power management. Supports a wide input voltage range of 4.5V to 18V, can provide 3A continuous output current, and integrates an N-channel MOSFET to achieve up to 96% efficiency without external Schottky diodes. The two models use PFM (light load pulse frequency modulation) and FCCM (forced continuous conduction mode) to optimize light load efficiency, which is suitable for network equipment, FPGA/DSP power supply, notebook and other scenarios.
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[ CXSD62629 ]"
CXSD62629/CXSD62629F: High Performance Synchronous Buck Regulator
Product overview
CXSD62629 and CXSD62629F are JTM-IC synchronous buck regulators based on the I² control architecture designed for efficient power management. Support4.5V to 18V Wide Input Voltage Range, can provide3A continuous output current, And integrate an N-channel MOSFET, which can achieve up to 96% efficiency without external Schottky diodes. The two models use PFM (light load pulse frequency modulation) and FCCM (forced continuous conduction mode) to optimize light load efficiency, which is suitable for network equipment, FPGA/DSP power supply, notebook and other scenarios.
Core Features
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High Performance Design
- Input voltage range: 4.5V ~ 18V, output current 3A, efficiency up to 96%.
- Light-load optimization: the CXSD62629 adopts PFM mode and the CXSD62629F adopts FCCM mode to improve light-load efficiency.
- Fixed 600kHz switching frequency reduces external component size.
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Multiple protection mechanisms
- Output short circuit protection, thermal shutdown protection, current runaway protection, and input undervoltage lockout (UVLO).
- Automatically enter hiccup mode when short-circuited (sleep 6144 cycle after 2048 attempts) to ensure system safety.
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Compact package
- SOT563 Package(1.6mm × 1.6mm), saving PCB space, suitable for high-density design.
Typical Application Circuit
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VIN → CIN → CXSD62629 → L → COUT → VOUT │ BST-CBST FB-RH/RL分压
- Input capacitance (CIN): 22 μF ceramic capacitor is recommended to reduce input ripple.
- Output capacitance (COUT): 44 μF low ESR ceramic capacitor for optimized transient response.
- Inductance (L): 3.3 μH (at 3.3V output), ripple current is controlled within 40% current limit.
Design Considerations
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PCB Layout Optimization
- The input capacitor is as close as possible to the VIN and GND pins to shorten the high-frequency loop.
- The FB feedback line is far away from the inductor and the SW node to avoid noise interference.
- Large area ground layer to enhance heat dissipation capacity.
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Thermal Management
- The upper limit of the junction temperature is 150°C, and it is recommended to reduce the thermal resistance through copper foil or heat dissipation holes (& theta;JA = 145°C/W).
Industry Application Cases
- Network Equipment: Provides stable low-voltage power supply for ASIC/FPGA.
- Green Home Appliances: Low standby power consumption (IQ<1μA) meets energy efficiency standards.
- Notebook power supply: 12V input to 3.3V/5V, support fast load switching.
Why choose JTM-IC?
As a professional power IC supplier, JTM-IC (official website:jtm-ic.com) provides:
- Full range of RoHS compliant productsLead-free, Halogen-free.
- Technical support and reference designs to accelerate customer product time to market.
Extended readingFor more specification downloads and technical support, please visitJTM-IC official website.
