The MAX15039 high-efficiency switching regulator delivers up to 6A load current at output voltages from 0.6V to (0.9 x VIN). This device operates from 2.35V to 5.5V, making it ideal for on-board point-of-load and postregulation applications. Total output error is less than ±1% over load, line, and temperature.
The MAX15039 features fixed-frequency PWM-mode operation with a switching frequency range of 500kHz to 2MHz set by an external resistor. The device offers a mode-select pin to allow forced-PWM operation, or skip-mode operation during light-load conditions. High-frequency operation allows for an all-ceramic capacitor design and small external components.
The low-resistance, on-chip nMOS switches ensure high efficiency at heavy loads while minimizing critical inductances, making layout a much simpler task with respect to discrete solutions. Following a simple layout and footprint ensures first-pass success in new designs.
The MAX15039 comes with a high-bandwidth (> 14MHz) voltage-error amplifier. The voltage-mode control architecture and the voltage-error amplifier permit a type III compensation scheme to achieve maximum loop bandwidth—up to 20% of the switching frequency. High loop bandwidth provides fast transient response, reducing output capacitance requirements and allowing all-ceramic capacitor designs.
The MAX15039 provides two three-state logic inputs to select one of nine preset output voltages. The preset output voltages allow customers to achieve ±1% output-voltage accuracy without using expensive 0.1% resistors. In addition, output voltage can be set to any customer value by either using two external resistors at the feedback with 0.6V internal reference or applying an external reference voltage to the REFIN input. The MAX15039 offers programmable soft-start time using one capacitor to reduce input inrush current. The MAX15039 is available in a lead-free, 24-pin, 4mm x 4mm TQFN package.
Key Features
Internal 21Ω RDSON MOSFETs
Continuous 6A Output Current
±1% Output Accuracy over Load, Line, and Temperature
Operates from 2.35V to 5.5V Supply
Adjustable Output from 0.6V to (0.9 x VIN)
Soft-Start Reduces Inrush Supply Current
500kHz to 2MHz Adjustable Switching Frequency
Compatible with Ceramic, Polymer, and Electrolytic Output Capacitors
VID-Selectable Output Voltages
0.6, 0.7, 0.8, 1.0, 1.2, 1.5, 1.8, 2.0, and 2.5V
Fully Protected Against Overcurrent and Overtemperature
