AP3433 Datasheet | BCD Semiconductor

Preliminary Datasheet 3A, 2MHz High Performance Synchronous Buck Converter AP3433 General Description The AP3433 is a current mode, PWM synchronous buck (step-down) DC-DC converter, capable of driving a 3A load with high efficiency, excellent line and load regulation. The device integrates two N-channel power MOSFETs with low on-resistance. Current mode control provides fast transient response and cycle-by-cycle current limit. The switching frequency of AP3433 can be programmable from 300k Hz to 2MHz, which allows small-sized ponents, such as capacitors and inductors. A standard series of inductors from several different manufacturers are available. This feature greatly simplifies the design of switch-mode power supplies. Under voltage lockout is internally set at 2.6V, but can be increased by programming the threshold with a resistor network on the enable pin. The output voltage startup ramp is controlled by the soft-start pin. An open drain power good signal indicates the output is within 93% to 107% of its nominal voltage. The AP3433 is available in QFN-3×3-16 package. Features - Input Voltage Range: 2.95V to 5.5V - 0.827V Reference Voltage with ±3% Precision - Two 45mΩ(typical) MOSFETs for High Efficiency at 3A Load - High Efficiency: up to 94% - Output Current: 3A - Programmable Frequency:300k Hz to 2MHz - Current Mode Control - Synchronizes to External Clock - Adjustable Soft-start - Soft Start-up into Pre-biased Output - UV and OV Power Good Output - Built-in Over Current Protection - Built-in Thermal Shutdown Function - Programmable UVLO Function - Built-in Over Voltage Protection - Thermally Enhanced 3mm×3mm 16-pin QFN Applications - Low-voltage, High-density Power Systems - Point of Load Regulation for Consumer Applications such as Set Top Boxes, LCD Displays, CPE...