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*Note: Please set EN voltage〈Vbat voltage, the best EN voltage from MCU is 2V

Figure 3. Functional Block Diagram

CONTROLLER CIRCUIT

The controller circuit of the device is based on a fixed frequency multiple feedforward

controller topology. Input voltage, output voltage, and voltage drop on the NMOS switch are

monitored and forwarded to the regulator. So changes in the operating conditions of the

converter directly affect the duty cycle and must not take the indirect and slow way through

Soft Start Time

Tss

1.5

ms

LBI voltage threshold

VLBI voltage decreasing

0.5

V

HM5178