Analog Devices MAX8505 Product Info

• Saves Space—4.9mm x 6mm Footprint, 1µH Inductor, 47µF Ceramic Output Capacitor
• Input Voltage Range
  • 2.6V to 5.5V
  • Down to 2.25V with Bias Supply
• 0.8V to 0.85 x V_IN, 3A Output
• Ceramic or Polymer Capacitors
• ±1% Output Accuracy over Load, Line, and Temperature
• Fast Transient Response
• Adjustable Soft-Start
• In-Regulation Soft-Start Limits Output-Voltage Dips at Power-On
• POK Monitors Output Voltage

The MAX8505 step-down regulator operates from a 2.6V to 5.5V input and generates an adjustable output voltage from 0.8V to 0.85 x V_IN at up to 3A. With a 2.6V to 5.5V bias supply, the input voltage can be as low as 2.25V.

The MAX8505 integrates power MOSFETs and operates at 1MHz/500kHz switching frequency to provide a compact design. Current-mode pulse-width-modulated (PWM) control simplifies compensation with ceramic or polymer output capacitors and provides excellent transient response.

The MAX8505 features 1% accurate output over load, line, and temperature variations. Adjustable soft-start is achieved with an external capacitor. During the soft-start period, the voltage-regulation loop is active. This limits the voltage dip when the active devices, such as microprocessors or ASICs connected to the MAX8505's output, apply a sudden load current step upon passing their undervoltage thresholds.

The MAX8505 features current-limit, short-circuit, and thermal-overload protection and enables a rugged design. Open-drain power-OK (POK) monitors the output voltage.

Applications

• µP/ASIC/DSP/FPGA Core and I/O Supplies
• Chipset Supplies
• Network and Telecom Equipment
• Server, RAID, and Storage Systems