HT7727A(2007) 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT7727A
(Rev.:2007)

PFM Step-up DC/DC Converter

Holtek Semiconductor 

Application Circuits

Without CE Pin

47mH ~100mH

V IN

1N 5817

HT77XXA

V OUT

4 7 m F ( T a n ta lu m )

LX

H T77X X A

VO UT

S e r ie s

GND

With CE Pin

V IN

47mH ~100mH

1N 5817

2 2 m F ( T a n ta lu m )

V OUT

4 7 m F ( T a n ta lu m )

LX

H T77X X A

VO UT

S e r ie s

CE

GND

2 2 m F ( T a n ta lu m )

47mH ~100mH

1N 5817

V IN

V OUT

4 7 m F ( T a n ta lu m )

LX

H T77X X A

VO UT

S e r ie s

CE

GND

2 2 m F ( T a n ta lu m )

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.

Rev 1.10

8

September 26, 2007

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