7

Parameter

Symbol

Condition

Min.

Typ.

Max.

Unit

Input voltage range

Vin

2.6

4.4

V

current consumption under

still condition 1

Iqs1

1x mode, Iled=0mA

300

550

μA

current consumption under

still condition 2

Iqs2

2x mode, Iled=0mA

9

16

mA

Standby current

Isd

EN1=EN2=0V

0.1

1.0

μA

LED current

LED current ratio1

(Iled/Iset1/2)

Iled1 Vin=3.8V, Iled=200mA, Vf=3.3V

typ.×

0.96

3250

typ.×

1.04 mA/mA

LED current ratio2

(Iled/Iset1/2)

Iled2 Vin=3.3 to 4.4V,

Iled=200 to 800mA

typ.×

0.90

3250

typ.×

1.10 mA/mA

Iled dropout voltage1

Vled1

(Min.)

Mode switch threshold voltage,

Iled=300mA

125

225

mV

Iled dropout voltage2

Vled2

(Min.)

Mode switch threshold voltage,

Iled=150mA

80

100

120

mV

Mode switch delay time1

Td1

EN1=High, EN2=Low

100

150

200

ms

Mode switch delay time2

Td2

EN1=Low or High, EN2=High

1

2

3

ms

LED current on time

LED(on) since EN is ON until LED current

starts

50

130

250

μs

Current capability

Iled

(Max.)

Vin=3.3V, EN1=EN2=High, set

Iled=1A, VF=4.6V

900

mA

LED current stablize time1

TIled1 Iled=0mA→200mA

40

μs

LED current stablize time2

TIled2 Iled=200mA→700mA

60

μs

LED current during soft

step-up

Iled

(soft) set Iled=700mA

250

350

450

mA

Charge pump

Soft step-up

Tsoft Iled=700mA, Vo=3.7V→5.2V

75

150

300

μs

1x mode output voltage

Vo(x1) Iled=0mA

Vin

V

2x mode output voltage

Vo(x2) Iled=0mA

typ.×

0.95

5.5

typ.×

1.05

V

1x mode output impedance

Ro(x1) Vin=3.4V

0.25

0.37

Ω

2x mode output impedance

Ro(x2) (2Vin-Vo)/Io, Vin=3.2V,

Vo=5.1V

1.70

2.55

Ω

Oscillation frequency

Fosc

0.72

0.90

1.08

MHz

EN1, EN2

Output on control voltage

Vc(ON) Vin=2.9 to 4.4V, each pin

0.95

V

Output off control voltage

Vc(OFF) Vin=2.9 to 4.4V, each pin

0.45

V

EN bias current

Ic(ON) Ven=3.6V, each pin

20

50

μA

ISET1, ISET2

Reference voltage

Vref

Iset=50μA, each pin

1.202 1.220 1.238

V

ISET set current

Iset

each pin

310

μA

■Electrical characteristics

When conditions are not mentioned specifically, Vin=3.6V, Cin=C1=2.2μF, Co=4.7μF, Ta=25°C

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