ACE705

High efficiency, Low supply current, step-up DC/DC Controller

VER 1.4

8

(5)Vout~GND filter Capacitor

Because the chip

’s switch current flows from Vout pin, then through the chip into GND pin. Therefore if

the output capacitor

’s two pins were not very near the chip’s Vout pin and GND pin, Vout ‘s stable would

be affected. User will found that the output voltage will drop when load grows up if the output capacitor

’s

two pin is not very near the chip

’s Vout pin and GND pin. In this condition, 1nF ceramic capacitor is

recommended at very near the chip

’s Vout pin and GND pin. So in all ACE705 application, two capacitors

are needed to obtain stable output voltage. The 100

μF tantalum output capacitor is recommended to

stable output voltage nearby load. The 1nF Vout pin to GND pin ceramic filter capacitor is recommended

to stable chip

’s sense voltage.

Test Circuits

(1) Output voltage test circuit

ACE705

Figure 3

(2) Quiescent current test circuit

ACE705

Figure 4

(3) Input Current (no load) test circuit

ACE705

Figure 5