AiT Semiconductor introduces the A7431, a wide input voltage, high-efficiency CC/CV step-down DC-DC converter operating in either CV (Constant Output Voltage) or CC (Constant Output Current) mode. This converter provides up to 3 A output current at 125 kHz switching frequency.
A7431 eliminates the expensive, high-accuracy current sense resistor, making it ideal for battery charging applications and adaptors with accurate current limits. The A7431 achieves higher efficiency than traditional constant current switching regulators by eliminating its associated power loss on the additional current sensing resistor. A7431 provides an OVP pin for output over-voltage protection.
A7431 integrates adaptive gate drive to achieve excellent EMI performance passing EN55022 Class B EMC standard without adding additional EMI components while maintaining high conversion efficiency. Protection features include cycle-by-cycle current limit, thermal shutdown, and frequency foldback at short circuits. A7431 is available in a PSOP8 package and requires very few external devices for operation. The A7431 is available in the PSOP8 package.
Key features
- 42 V Input Voltage Surge
- 36 V Steady State Operation
- Up to 3 A Output Current
- Output Voltage up to 12 V
- 125 kHz Switching Frequency
- Up to 91% Efficiency
- Stable with Low-ESR Ceramic Capacitors to Allow Low-Profile Designs
- Integrated Over Voltage Protection
- Excellent EMI Performance
- Constant Current Control Without Additional Current Sensing Resistor Improves Efficiency and Lowers Cost.
- Resistor Programmable Current Limit from 1.5 A to 3.5 A
- Up to 0.5 V Excellent Cable Voltage Drop Compensation
- ±7.5% CC Accuracy
- 2% Feedback Voltage Accuracy
- Advanced Feature Set: Integrated Soft Start, Thermal Shutdown, Cycle-by-Cycle Current Limit
- Available in PSOP8 Package
Key applications
- Car Charger/ Adaptor
- Rechargeable Portable Devices
- General-Purpose CC/CV Supply
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