ST1208

V1.1

8/12

2004/10/27

! Absolute Maximum Ratings

IN, OUT, EN1, EN2 to GND ........……..…....... -0.3V to + 6.0V

SET, LED1, LED2, LED3 to GND ….… -0.3V to ( VIN + 0.3V )

C1N, C2N to GND .........................…..... -0.3V to ( VIN + 1V )

C1P, C2P to GND ...........................……... -0.3V to greater of

Continuous Power Dissipation (TA = +70°C)

16-Pin QFN ( de-rate 17 mW/°C above +70°C )

1350 mW

16-Pin TSSOP ( de-rate 18 mW/°C above +70°C ) 1500 mW

Operating Temperature Range ...….................-40°C to +85°C

Storage Temperature Range .…....................-40°C to +125°C

! Electrical Characteristics

Condition: VIN = VEN1 = VEN2 = 3.6 V, CIN = C1 = C2 = COUT = 1 uf, dropout current is 60 mA. ( 20 mA / LED X 3 ), LED Vf

= 3.3 V, ISET = 125 uA, Charge pump switching

( TA = +25℃)

Symbol

Parameter

Test Condition

Min.

Typ. Max.

Unit

IN Operating Voltage

-

2.7

-

5.0

V

Power Supply Current

Switching, no load

-

2.0

4.0

mA

Maximum OUT Current

VIN >=3.6 V, EN1 = EN2 = IN

100

-

mA

Maximum LEDx Sink Current

EN2 = IN

28

30

-

mA

Shutdown Supply Current

EN1 = EN2 = GND

-

1

3

uA

SET Leakage in Shutdown

EN1 = EN2 = GND, TA = 25

℃

-

0.01

0.1

uA

LED Leakage in Shutdown

EN1 = EN2 = GND, TA = 25

℃

-

0.01

0.1

uA

SET Current Range

30

-

200

uA

EN1, EN2 Logic High Voltage

VIN=2.7 V to 5.0 V

-

V

EN1, EN2 Logic Low Voltage

VIN=2.7 V to 5.0 V

0

-

V

EN1, EN2 Input Current

VENx = GND or 5.0 V, TA = 25

℃

-

0.5

1.0

uA

LEDx Minimum Regulation

Voltage (1.5x Mode)

200

300

400

mV

LEDx Dropout Voltage

-

20

30

mV

VIN = 4.2 V, IOUT = 60 mA

-

7

10

Open-Loop OUT Resistance

@ VIN = 3.6 V, IOUT = 60 mA

-

11

15

Ohm

Switching Frequency

± 20%

0.8

1.0

1.2

MHz

Thermal-Shutdown Threshold

20℃ hysteresis

130

160

190

℃

Undervoltage Lockout Threshold VIN rising or falling, 0.25V hysteresis

2.2

2.3

2.6

V

EN1 = EN2 = IN

145

160

175

EN1 = IN, EN2 = GND

43

48

52

K

SET to LEDx Current Ratio

( ILED / ISET )

EN1 = GND, EN2 = IN

14

16

17

A/A

A

LEDx Current Accuracy

TA = 0℃ ~ 85℃

-

±3

-

%

M

LEDx Current Matching

TA = 0℃ ~ 85℃ ( Note 1 )

-

±3

-

%

η

Peak efficiency in 1x mode

80

88

-

%