AIC1653 데이터 시트보기 (PDF) - Analog Intergrations

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AIC1653

Micropower Inverting DC/DC Converter in SOT-23-5

Analog Intergrations 

AIC1653

bursts by ramping up the inductor current, which is

then delivered to load. If either inductor value over

22µH or capacitor value under 4.7µF is used,

output ripple voltage will increase because the

capacitor will be slightly overcharged in each burst

cycle. Two methods of helping reduce output ripple

voltage are recommended. One is to increase the

output capacitor value. Adding a 100pF

feedforward capacitor that is parallel with R1 (see

Fig.13) is the other. And the addition of the small

capacitor will greatly reduce output ripple voltage.

Output Voltage Programming

A resistive divider, as in formula (3), sets the output

voltage.

( ) VOUT

=

−1.23V



1

+

R1

R2



+

R1×

2 × 10− 6





(3)

A capacitor at 100pF in parallel to the upper

feedback resistor is required for a stable feedback.

PCB Layout

Proper PCB layout and component placement may

enhance the performance of AIC1653 application

circuit. For a better efficiency, major loop from

input terminal to output terminal should be as short

as possible. In addition, in a case of a large current

loop, the track width of each component in the loop

should maintain as wide as possible. In order to get

rid of noise interference, separation of Schottky

diode ground and output terminal ground into two

independent parts is required. Recommended

layout diagrams and component placement are

shown as Fig. 9 to Fig. 12.

Fig. 9 Top Layer

Fig. 10 Bottom Layer

9

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