CXDC65121 is a high-performance synchronous buck converter with built-in 50m Ω high side PMOS and 30m Ω low side NMOS, equipped with comprehensive constant voltage (CV) and constant current (CC) control functions. The chip supports a wide input voltage range of 7.5V to 33V, with adjustable output voltage and 100% duty cycle operation, suitable for various harsh power environments. Its design with a fixed 135kHz switching frequency and no need for external compensation greatly simplifies system solution development and material costs.
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[ CXDC65121 ]"
CXDC65121: 33V withstand voltage 3A output step-down DC-DC converter, empowering high reliability car power supply design
In automotive electronics, portable charging devices, and industrial power systems, high input voltage, high current output, and stable constant voltage and current performance are the core requirements of power chips. CXDC65121, as a step-down DC-DC converter with an input withstand voltage of up to 33V and support for 3A continuous output current, is an ideal choice for car chargers, adapters, and various embedded power applications due to its high integration, high-precision protection mechanism, and minimalist peripheral circuit design.
Chip Overview
CXDC65121 is a high-performance synchronous buck converter with built-in 50mΩ High voltage side PMOS and 30mΩ Low voltage side NMOS with complete constant voltage (CV) and constant current (CC) control functions. The chip supports a wide input voltage range of 7.5V to 33V, with adjustable output voltage and 100% duty cycle operation, suitable for various harsh power environments. Its design with a fixed 135kHz switching frequency and no need for external compensation greatly simplifies system solution development and material costs.
Core Features
1. High voltage withstand and high-efficiency power architecture
• Input voltage withstand up to 33VThe instantaneous withstand voltage can reach 35V, adapting to voltage fluctuation environments in car power supplies.
• Built in 50mΩ PMOS transistor and 30mΩ Lower transistor NMOSEffectively reducing conduction losses and improving overall system efficiency.
• Support 3A continuous output currentMeet the power supply needs of most medium to high power devices.
2. High precision constant voltage and constant current control
• Constant voltage accuracy± 2%The feedback voltage (VFB) reference is 1V, and the output voltage can be flexibly set through an external voltage divider resistor
• Constant current accuracy± 7%By detecting the voltage between the CSP and CSN pins (typical value of 50mV), precise current control can be achieved
• Output overvoltage protection (OVP) Automatically shut down the output when the VFB voltage exceeds 1.3V to protect the backend equipment.
3. Comprehensive system protection mechanism
• Short circuit protection (SCP)When the output voltage is below 2.2V, it automatically enters the current limiting mode. If it continues for 4ms without recovery, it enters the hiccup mode (32ms restart).
• Overheating protection (OTP)When the junction temperature exceeds 140 ℃, the output is turned off, and it automatically recovers after cooling to 115 ℃.
• Undervoltage protection (UVLO)Turn off the chip when the input voltage is below 6.5V, and restart when it is above 7.2V to prevent battery overdischarge.
• Cable voltage drop compensationBuilt in 5-fold compensation coefficient, effectively compensating for voltage loss caused by output cables.
4. Simplify system design
• No need for external compensation circuitRelying on the internal loop of the chip to achieve stable constant voltage and current control.
• Fixed 135kHz switching frequencyEffectively balance efficiency and component size.
• SOP-8 encapsulationHas good heat dissipation and welding process adaptability.
Typical application scenarios
• Car charger and adapterSupports 12V/24V vehicle power system and provides standard outputs such as 5V/3A.
• Industrial power moduleSuitable for PLC, industrial control equipment and other applications that require wide voltage input and high reliability.
• Portable device power supplyHigh current battery load systems such as drones, robots, and power tools.
• LED driving power supplyThe constant current characteristic is suitable for driving high-power LED light groups.
Summary of Electrical Characteristics
| parameter | condition | typical value | unit |
|---|---|---|---|
| Input voltage range | work | 7.5 ~ 33 | V |
| quiescent current | VFB=1.5V | one thousand and five hundred | µ A |
| standby current | no-load | one point five | mA |
| switching frequency | one hundred and thirty-five | kHz | |
| Minimum conduction time | three hundred and fifty | ns | |
| Thermal shutdown temperature | one hundred and forty | ℃ |
Packaging and Supply Information
CXDC65121 adopts the standard SOP-8L package, with a size of 4.9mm× 3.9mm (typical value), supports automatic surface mounting and reflow soldering processes. The product is supplied in reel packaging, with 2500 pieces per reel, suitable for large-scale production needs.
About JTM-IC Jiataimu
JTM-IC is committed to providing customers with highly reliable and high-performance power management and analog chip solutions. The company's products include DC-DC converters, battery management ICs, LED drivers, and other series, which are widely used in automotive electronics, industrial control, consumer electronics, and other fields.
For more technical information, reference designs, and sample applications about CXDC65121, please visit the official website:http://www.jtm-ic.com
