HT7727A(2007) 查看數據表（PDF） - Holtek Semiconductor

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HT7727A
(Rev.:2007)

PFM Step-up DC/DC Converter

Holtek Semiconductor 

HT77XXA

Electrical Characteristics

VIN=VOUT´0.6; IOUT=10mA; Ta=25°C (Unless otherwise specified)

Symbol

Parameter

Test Conditions

Min. Typ. Max. Unit

VIN

VOUT

Input Voltage

Output Voltage Tolerance

¾

¾

¾

6

V

¾

-2.5 ¾ 2.5 %

VSTART

VHOLD

IIN

IDD

ISHDN

Start-up Voltage (Fig. 1)

VIN: 0®2V; IOUT=1mA

Minimum Hold-on Voltage (Fig. 1) VIN: 2®0V; IOUT=1mA

No-load Input Current (Fig. 1) IOUT=0mA

Supply Current (Fig. 2)

VS=VOUT+0.5V

Measured at VOUT pin

Shutdown Current

CE=GND

¾ 0.7 0.9 V

¾

¾ 0.7

V

¾ 13 26 mA

¾

5

10 mA

¾ 0.5

1

mA

VIH

CE High Threshold

¾

2

¾¾

V

VIL

CE Low Threshold

¾

¾

¾ 0.4

V

ILEAK

LX Leakage Current (Fig. 3)

VS=VOUT+0.5V, VX=6V

Measured at the LX pin

¾

¾ 0.9 mA

fOSC

Maximum Oscillator Frequency VS=VOUT´0.95, VX=6V

(Fig. 3)

Measured at LX pin

¾ 200 ¾ kHz

DOSC

Oscillator Duty Cycle (Fig. 3)

VS=VOUT´0.95, VX=6V

Measured at LX pin

65 75 85 %

h

Efficiency

¾

¾

85

¾

%

Note: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating Ratings

indicate conditions for which the device is intended to be functional, but do not guarantee specific performance

limits. The guaranteed specifications apply only for the test conditions listed.

Test Circuit

100mH

1N 5817

V IN

V OUT

47mF

LX

( T a n ta lu m )

VO UT

H T77X X A

S e r ie s

GND

(F ig . 1 )

22mF

VS

( T a n ta lu m )

VO UT

LX

VS

H T77X X A

S e r ie s

GND

VO UT

LX

H T77X X A

S e r ie s

GND

100W

VX

(F ig . 2 )

(F ig . 3 )

Rev 1.10

3

September 26, 2007

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