AP2952AS8PRG

AP2952A is a monolithic synchronous rectified step-down regulator integrating a 130mΩ on-resistance MOSFET, capable of delivering 2A load current over a wide input voltage range (4.75V - 18V). Current mode control provides excellent transient response and cycle-by-cycle current limiting. Adjustable soft-start time prevents inrush current at startup, and input current is less than 1uA in shutdown mode. The AP2952A is packaged in SOP8-PP, offering a compact system solution that minimizes external components. AP2952A is a synchronous rectified, current mode, step-down regulator. It regulates output voltage as low as 0.925V from input voltages ranging from 4.75V to 18V, supplying a maximum load current of 2A. The AP2952A uses current control mode to regulate the output voltage. First, the output voltage is sensed at the FB pin through a resistor divider and amplified by an internal transconductance error amplifier. The output voltage is then controlled by comparing the COMP pin voltage with the internally sensed switch current. The converter uses an integrated N-channel MOSFET switch to step down the input voltage and regulate the output voltage. Since the high-side MOSFET gate voltage must exceed the input voltage, a bootstrap capacitor is connected between SW and BS to drive the high-side gate. When SW is low, the bootstrap capacitor charges from the internal 5V supply. When the AP2952A FB pin exceeds 20% above the 0.925V regulation threshold, the overvoltage comparator trips, discharging the COMP pin and SS pin to ground and forcing the high-side switch off.

Applications

• Discrete power supply systems
• Network systems
• FPGA, DSP, ASIC power supply
• Green electronics laptops

Key features

• 2A output current
• Input voltage range: 4.75V to 18V
• Integrated 130mΩ power MOSFET
• Adjustable output voltage range: 0.925V to 15V
• Up to 95% efficiency
• Adjustable soft-start time
• Stable operation guaranteed with low-ESR ceramic capacitors
• Fixed 450kHz switching frequency
• Cycle-by-cycle current limiting
• Under-voltage protection
• SOP8-PP package with enhanced thermal dissipation