Kiwi Instruments KP3501AVGA

KP3501A is a non-isolated, highly integrated, low-cost PWM power switch designed for buck and buck-boost circuits. KP3501A adopts a high-voltage single-chip process, integrating a 500V high-voltage MOSFET and a controller with switching peak current mode control on the same die. A highly accurate default 5V output is guaranteed across the full input voltage range. Internally, the minimum Toff time is fixed at 20μs with a frequency dithering function, optimizing EMI performance while maintaining output power. The device also features light-load and heavy-load modes, enabling standby power consumption below 50mW with ease. KP3501A integrates comprehensive protection features: VDD undervoltage lockout, cycle-by-cycle current limiting, abnormal overcurrent protection, overtemperature protection, overload protection, and short-circuit protection.

• High-accuracy 5V default output
• Integrated 500V high-voltage MOSFET and high-voltage startup circuit
• Integrated freewheeling diode
• Integrated sampling resistor for ultra-low system cost
• Supports ultra-low input voltage (above 15V) applications
• Supports buck and buck-boost topology switched peak current mode control
• Ultra-low standby power consumption < 50mW
• Up to 45kHz switching frequency
• Ultra-low operating current with small VDD capacitor support, integrated soft-start circuit
• Integrated protection features

• Small appliance power supply auxiliary power supply