Function Description
The PW2059 is a high performance, 800mA, 1.5MHz monolithic step-down converter. The PW2059 requires only three external power components (CIN, COUT and L). The adjustable version can be programmed with external feedback to any voltage, ranging from 0.6V to the input voltage.
At dropout operation, the converter duty cycle increases to and the output voltage tracks the input voltage minus the RDS(ON) drop of the high-side MOSFET.
The internal error amplifier and compensation provides excellent transient response, load, and line regulation. Soft start function prevents input inrush current and output overshoot during start up.
Application Information
Setting the Output Voltage
The internal reference VREF is 0.6V (Typical). The output voltage is divided by a resistor divider,R1 and R2 to the FB pin. The output voltage is given by：
Inductor Selection
For most designs, the PW2059 operates with inductors of 1μH to 4.7μH. Low inductance values are physically smaller but require faster switching, which results in some efficiency loss. The inductor value can be derived from the following equation:
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