Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator With Dual LDO Controllers

The MAX15022 is a dual-output, pulse-width-modulated (PWM), Step-down DC-DC Regulator with dual LDO con- trollers. The device operates from 2.5V to 5.5V and each output CAN be adjusted from 0.6V to the input supply (VAVIN). The MAX15022 delivers up to 4A (regu- lator 1) and 2A (regulator 2) of output current with two LDO controllers that CAN be used to drive two external PNP Transistors to provide two additional outputs. This device offers the ability to adjust the switching frequen- cy from 500kHz to 4MHz and provides the capability of optimizing the design in terms of size and performance. The MAX15022 utilizes a voltage-mode control scheme with external compensation to provide good noise immunity and maximum flexibility in selecting inductor values and capacitor types. The dual switching regula- tors operate 180 out-of-phase, thereby reducing the RMS input ripple current and thus the size of the input bypass capacitor significantly. By Maxim Integrated Products