Please refer to Table 4 and the following paragraphs for a detailed description of the functional modes for the LM53625/35-Q1. These modes are controlled by the FPWM input as shown in Table 4. This input can be controlled by any compatible logic, and the mode changed, while the regulator is operating. If it is desired to fix the mode for a given application, the input can be either connected to ground, a logic supply, or the VCC pin, as desired. The maximum input voltage on this pin is 5.5 V; the FPWM pin should not be allowed to float.
|FPWM INPUT VOLTAGE||OPERATING MODE|
|> 1.5 V||Forced PWM: The regulator operates as a constant frequency, current mode, full-synchronous converter for all loads; without diode emulation.|
|< 0.4 V||AUTO: The regulator moves between PFM and PWM as the load current changes, utilizing diode-emulation mode to allow DCM (see theGlossary ).|