DLPS043B June 2014 – February 2018 DLPA2000
PRODUCTION DATA.
To properly configure the DLPA2000 device, a 2.2-µH inductor must be connected between pin L1 and pin L2. The peak current for the inductor in steady state operation can be calculated.
Equation 4 shows how to calculate the peak current I1 in step down mode operation, and Equation 5 shows how to calculate the peak current I2 in boost mode operation. VIN1 is the maximum input voltage, VIN2 is the minimum input voltage, f is the switching frequency (2.25 MHz), and L the inductor value (2.2 µH).
The critical current value for selecting the right inductor is the higher value of I1 and I2. Also consider that load transients and error conditions may cause higher inductor currents. This needs to be accounted for when selecting an appropriate inductor. Internally the switching current is limited to a maximum of 4 A.