ST1208
! 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
.................................................. ....(VOUT + 1V) or (VIN + 1V)
Continuous Power Dissipation (TA = +70°C)
16-Pin QFN ( de-rate 17 mW/°C above +70°C )
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
1350 mW
! 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
IN Operating Voltage
Power Supply Current
Maximum OUT Current
Test Condition
Min. Typ. Max. Unit
VIN
IIN
IOUT
-
2.7
-
100
-
5.0
4.0
-
V
Switching, no load
2.0
mA
mA
VIN >=3.6 V, EN1 = EN2 = IN
VIN >=3.3 V, ISET = 190 uA, EN1 =
EN2 = IN
ILED
Maximum LEDx Sink Current
28
30
-
mA
IINS
Shutdown Supply Current
SET Leakage in Shutdown
EN1 = EN2 = GND
EN1 = EN2 = GND, TA = 25℃
EN1 = EN2 = GND, TA = 25℃
-
-
1
3
uA
uA
ILSS
0.01
0.1
ILLS
LED Leakage in Shutdown
-
0.01
0.1
uA
ISET
VIH
VIL
IEN
SET Current Range
30
0.7 VIN
-
-
-
200
VIN
0.2 VIN
uA
V
V
EN1, EN2 Logic High Voltage
EN1, EN2 Logic Low Voltage
EN1, EN2 Input Current
VIN=2.7 V to 5.0 V
VIN=2.7 V to 5.0 V
VENx = GND or 5.0 V, TA = 25℃
0
-
0.5
1.0
uA
LEDx Minimum Regulation
Voltage (1.5x Mode)
LEDx Dropout Voltage
VLED
VDP
EN1 = EN2 = IN, ISET = 125 uA
ISET = 125 uA
1x mode ( 1 X VIN - VOUT ) / IOUT
VIN = 4.2 V, IOUT = 60 mA
1.5x mode ( 1.5 X VIN - VOUT ) / IOUT
@ VIN = 3.6 V, IOUT = 60 mA
± 20%
200
300
20
7
400
30
mV
mV
-
-
@
10
ROUT
Open-Loop OUT Resistance
Ohm
-
11
15
fSW
TTS
VUV
Switching Frequency
0.8
130
2.2
145
43
1.0
160
2.3
160
48
1.2
190
2.6
175
52
MHz
℃
20℃ hysteresis
Thermal-Shutdown Threshold
Undervoltage Lockout Threshold VIN rising or falling, 0.25V hysteresis
V
EN1 = EN2 = IN
SET to LEDx Current Ratio
( ILED / ISET )
K
A
ISET= 125 uA
A/A
%
EN1 = IN, EN2 = GND
EN1 = GND, EN2 = IN
14
16
17
EN1 = EN2 = IN, RSET = 4.8KOhm,
TA = 0℃ ~ 85℃
±3
LEDx Current Accuracy
-
-
EN1 = EN2 = IN, ISET = 125 uA,
TA = 0℃ ~ 85℃ ( Note 1 )
±3
M
LEDx Current Matching
-
-
-
%
%
η
Peak efficiency in 1x mode
IOUT = 60 mA, PLEDs / PIN X 100 %
80
88
Note1: LEDx current matching is define as : ( ILEDX - IAVG ) / IAVG X 100 %.
V1.1
8/12
2004/10/27
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
