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High-Efficiency, White LED Step-Up Converter
with I 2 C Interface in 2mm x 2mm WLP
ELECTRICAL CHARACTERISTICS (continued)
(V IN = 3.6V, V GND = V PGND = 0V, V DD = 1.8V, T A = -40°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
LX Leakage Current
V IN = V LX = 5.5V, V DD = GND
T A = +25°C
T A = +85°C
0.01
0.1
1
μA
OSCILLATOR
Operating Frequency
1.8
2
2.2
MHz
Maximum Duty Cycle
Minimum On-Time
V LED1 or V LED2 = 0.2V
Skip mode
87
92
30
100
%
ns
COMP
Soft-Start Charge Current
-20
μA
COMP Input Resistance to GND
Step-up converter off
20
k Ω
I 2 C INTERFACE
SDA, SCL Logic Input High
Voltage
SDA, SCL Logic Input Low
Voltage
V DD = 1.6V to 5.5V
V DD = 1.6V to 5.5V
0.7 x
V DD
0.3 x
V DD
V
V
SDA Output Low Voltage
I SDA = 3mA
0.03
0.4
V
SDA, SCL Logic Input Current
V IL = 0V or V IH = 5.5V
T A = +25°C
T A = +85°C
0.01
0.1
1
μA
FAULT PROTECTION
Thermal Shutdown
Thermal-Shutdown Hysteresis
Temperature rising
+160
20
°C
°C
Output Overvoltage Threshold
Output Overvoltage Hysteresis
V OUT rising
28
4
30
V
V
Open LED_ Sense Voltage
LED_ enabled, measured at LED_
100
120
mV
Shorted LED_ Sense Voltage
Open/Short LED Debounce Timer
LED_ enabled, measured at LED_, V OUT = 10V
V OUT
- 2.2V
V OUT
- 0.7V
16
V
ms
_______________________________________________________________________________________
3
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