AP3790

Document number: DS37221 Rev. 3 - 2

10 of 17

www.diodes.com

October 2014

© Diodes Incorporated

AP3790

A Product Line of

Diodes Incorporated

Output Voltage Selection Section

The output voltage of AP3790 can be adjusted based on the patterns of load current aligned to MTK Pump Express protocol.

The voltage of CPC pin of AP3790 is changed with the load current. AP3790 can detect the load current patterns through CPC pin. The pattern

of decrease output voltage is shown in Figure 5 and the pattern of increase output voltage is shown in Figure 6.

Figure 5 The Pattern of Decrease Output Voltage

Figure 6 The Pattern of Increase Output Voltage

Just shown as Figure 7, the voltage is changed step by step among 4.8V and 3.6V. When the AP3790 detects one full pattern of decrease

output voltage, the output voltage will decrease 0.2V from the current voltage level. When the output voltage is 3.6V, the pattern of decrease

output voltage is invalid. When the AP3790 detects one full pattern of increase output voltage, the output voltage will increase 0.2V from the

current voltage level. When the output voltage is 5V, the pattern of decrease output voltage is invalid. At any voltage level among 4.8V to 3.6V,

any voltage level among 4.8V to 3.6V, once any protect function is triggered, the output voltage will return to 5V directly.

Figure 7. Voltage State Flow

5V

4.8V

4.6V

4.4V

4.2V

4.0V

3.8V

3.6V

WDT

WDT

Control Pattern