HT7718 datasheet(9/19 Pages) HOLTEK

9 / 19 page

Application Circuits

Without CE Pin

With CE Pin

Note:

For the SOT-25 package, when CE is pulled low, the internal blocks of the device, such as the reference band

gap, gain block, and all feedback and control circuitry will be switched off. The boost converter

¢s output, VOUT,

will be at a value one Schottky diode voltage drop below the input voltage and the LX pin remains in a high im-

pedance condition. The output capacitor and load at VOUT determine the rate at which VOUT decays.

HT77XX

Rev 1.60

September 12, 2007

V I N

L X

V O U T

H T 7 7 X X

S e r i e s

G N D

1 0 0 m F ( T a n t a l u m )

V O U T

1 0 0 m H

1 N 5 8 1 7

4 7 m F ( T a n t a l u m )

C E

V I N

L X

V O U T

H T 7 7 X X

S e r i e s

G N D

1 0 0 m F ( T a n t a l u m )

V O U T

1 N 5 8 1 7

4 7 m F ( T a n t a l u m )

C E

1 0 0 m H

V I N

L X

V O U T

H T 7 7 X X

S e r i e s

G N D

1 0 0 m F ( T a n t a l u m )

V O U T

1 0 0 m H

1 N 5 8 1 7

4 7 m F ( T a n t a l u m )

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