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ACE703

Technology

White LED PFM Step-Up DC-DC Converter

VER 1.2

Electrical Characteristics

(Vin＝2.5V， VCE=Vout＝3.3V，R＝33Ω，TA=25°C, unless otherwise noted.)

Reference data

Symbol

Item

Test conditions

Min

Typ. Max

Unit

100

120

180

200

220

230

250

270

280

300

320

330

350

370

VIFB

Feedback voltage

Iout=100mA

380

400

420

Vstart

Start-up voltage

Iout=1mA，

Vin：0

→2V

0.8

0.9

Vhold

Hold-on voltage

Iout=1mA，

Vin：2

→0V

0.6

0.7

IDD2*5

Quiescent current drawn from

power source

LX hung in air, VCE=VIFB=

Vout=3.3V, Vin=2.5V

Inoload*6

Current with no load

OUT pin and IFB pin without any

load, VIFB=0

100

150

ILX

LX switching current

Vlx=0.4V，VIFB=0

700

ILXleak

LX leakage current

Vout=Vlx=VIFB=6V,

Ileak

Stand-by current

Vout=3.3V, VCE=0, LX、IFB hung in

air

0.1

0.5

Fosc

Oscillator frequency

VIFB=0，

300

350

400 kHZ

Maxdty

Oscillator duty cycle

On（Vlx “L”）side

％

Efficiency

Iout=300mA

％

VCEH

CE “H” threshold voltage

VCE：0→2V

0.6

0.9

VCEL

CE “L” threshold voltage

VCE：2→0V

0.3

0.6

IOM

Maximum output current

VIFB=0，Vout≡3.3V

500

Note:

1.Diode:schottky type, such as:1N5817,1N5819,1N5822

2.Inductor:22uH(R<0.5

Ω)

3.Capacitor:100uF (Tantalum type)

4.Compensation capacitor:22uF (Tantalum type)

5.IDD2 is quiescent current drawn from power source, It is the minimum current of the chip without any dynamic current

6.Ino load is the current with no load in constant current application, it’s also the current consumed by the converter itself, including

the chip and external circuits, when Vin=2.5V,Vout=VOM

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