ACE707A

Micro Power Step-up DC-DC Converter

 

VER 1.2

7

The ACE707A contain additional circuitry to provide protection during start-up or under short-circuit

conditions. When the FB pin voltage is lower than approximately 0.6V, the switch off-time is increased to

1.5μs and the current limit is reduced to about 250mA (70mA for ACE707A). This reduces the average

inductor current and helps to minimize the power dissipation in the ACE707A power switch, in the

external inductor and in the diode.

The SHDN pin can be used to turn off the ACE707A and reduce the IQ to less than 1μA. In shutdown

mode the output voltage will be a diode drop below the input voltage.

Typical Application

Vin

L1

D1

Vout

2.5V to 4.2V

10uH

SS14

20V

R1

2M

C1

Vin

SW

C2

4.7 uF

ACE707A

1uF

RLOAD

SHEN

FB

GND

R2

130K

C1, C2: X5R or X7R Ceramic Capacitor

L1: SUMIDA CDRH4D16FB/NP-100MC or Equivalent

Figure 11. ACE707A Typical Application in LCD/OLED Bias Supply

ACE707A

C1, C2, C3: X5R or X7R Ceramic Capacitor

L1: SUMIDA CDRH4D16FB/NP-100MC or Equivalent

Figure 12. ACE707A Typical Application in 1 or 2 Cells to 3.3V Boost Converter