Voltage Mode PWM Controller 0V to 18V 6A 24-Pin QSOP

The MAX8529 dual, synchronized, step-down controller generates two outputs from input supplies ranging from 4.75V to 23V. Each output is adjustable from sub-1V to 18V. Input voltage ripple and total RMS input ripple current are reduced by synchronized 180-degree out-of-phase operation. The switching frequency is adjustable from 600kHz to 1.5MHz with an external resistor. Alternatively, the controller can be synchronized to an external clock generated to another MAX8529 or a system clock. One MAX8529 can be set to generate an in-phase, or 90-degree out-of-phase, clock signal for synchronization with additional controllers. This allows two controllers to operate either as an interleaved two- or four-phase system with each output shifted by 90 degrees. These devices also feature soft-start and soft-stop. The MAX8529 eliminates the need for current-sense resistors by utilizing the low-side MOSFET"s on-resistance as a current-sense element. This protects the DC-to-DC components from damage during output overload conditions or when output short circuit faults without requiring a current-sense resistor. Adjustable foldback current limit reduces power dissipation during short-circuit conditions. The MAX8529 includes a power-on reset output to signal the system when both outputs reach regulation. The MAX8529 is available in a 24-pin QSOP package. An evaluation kit is available to speed designs.

• Low Output Noise in DSL Band
• Ceramic Input/Output Capacitors
• Step-Down or Step-Up/Step-Down Operation
• Four Output, 90-Degree Out-of-Phase Operation (Using Two MAX8529s)
• Foldback Current Limit
• 4.75V to 23V Input Supply Range
• 0 to 18V Output Voltage Range (Up to 6A)
• > 90% Efficiency
• Fixed-Frequency PWM Operation
• Adjustable 600kHz to 1.5MHz Switching Frequency
• External SYNC Input
• Clock Output for Master/Slave Synchronization
• Soft-Start and Soft-Stop
• Active-Low RST Output with 140ms Minimum Delay
• Lossless Current Limit (No Sense Resistor)