PFM STEP-UP DC/DC CONVERTER WITH HIGH EFFICIENCY AND LOW NOISE

HT9261(A)

第 4 页共 13 页

RECOMMENDED OPERATING CONDITIONS

MIN

NOM

MAX

UNIT

Input voltage range

0.8

Vout

V

Inductor

10

27

100

µH

Input capacitor

0

≥10

µF

Output capacitor*

47

100

220

µF

Operating junction temperature

-20

85

℃

Suggestion：Use tantalum capacitor to reduce the ripple of the output voltage

ELECTRICAL CHARACTERISTICS

SYMBOL

ITEM

TEST CONDITIONS

REFERENCE DATA

UNIT

MIN

TYP

MAX

Vout

Output Voltage

Iout=10mA，

Vin=Vout*0.6

2.45

2.5

2.55

V

2.646

2.7

2.754

2.94

3.0

3.06

3.234

3.3

3.366

3.528

3.6

3.672

3.92

4.0

4.08

4.9

5.0

5.1

5.88

6.0

6.12

Vin

Input Voltage

12

V

Iin

Input Current

Iout=0mA，

Vin=Vout*0.6

12

15

uA

Vstart

Start-up voltage

Iout=1mA，

Vin：0→2V

0.8

0.9

V

Vhold

Hold-on voltage

Iout=1mA，

Vin：2→0V

0.6

0.7

V

Quiescent current

drawn from power

source

Without external

components,

Vout=Vout×1.05

4

7

uA

Rswon

Switch ON Resistance

0.4

0.5

Ω

ILXleak

LX leakage current

Vout=Vlx=6V

0.5

uA

VCEH

CE “H” threshold

voltage

VCE： 0→2V

0.6

0.9

V

VCEL

CE “H” threshold

voltage

VCE： 2→0V

0.3

0.6

V

Fosc

Oscillator frequency

LX on “L” side

Vout=Vout*0.96

300

350

400

Khz

Maxdty

Oscillator duty cycle

On（Vlx“L”）side

70

75

80

%



Efficiency

85

%

NOTE：

 Diode：Schottky type, such as：1N5817, 1N5819, 1N5822

 Inductor：27uH(R<0.5Ω)

 Capacitor：100uF (Tantalum type)