MIC23150_15 Datasheet, PDF (14/18 Pages) Micrel Semiconductor – 4MHz, PWM, 2A Buck Regulator with HyperLight Load

Micrel, Inc.
As shown in Equation 5, the load at which MIC23150
transitions from HyperLight Load mode to PWM mode is
a function of the input voltage (V_IN), output voltage (V_OUT),
duty cycle (D), inductance (L) and frequency (f). As
shown in Figure 2, as the output current increases, the
switching frequency also increases until the MIC23150
goes from HyperLight Load mode to PWM mode at
approximately 120mA. The MIC23150 will switch at a
relatively constant frequency around 4MHz once the
output current is over 120mA.
Figure 2. SW Frequency vs. Output Current
MIC23150
February 5, 2015
14
Revision 2.1