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White LED Current Regulator with 1x/1.5x
High-Efficiency Charge Pump
ABSOLUTE MAXIMUM RATINGS
IN, OUT, EN1, EN2 to GND ......................................-0.3V to +6V
SET, LED1, LED2, LED3, LED4,
LED5 to GND ...........................................-0.3V to (V IN + 0.3V)
PGND to GND..........................................................-0.3 to +0.3V
C1N, C2N to GND ..........................................-0.3V to (V IN + 1V)
C1P, C2P to GND ..........................................-0.3V to the greater
Continuous Power Dissipation (T A = +70°C)
16-Pin Thin QFN (derate 16.9 mW/°C) .......................1349mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
(V OUT + 1V) or (V IN + 1V)
OUT Short Circuit to GND..............................................Indefinite
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V IN = 3.6V, GND = PGND = 0, EN1 = EN2 = IN, C IN = C1 = C2 = 1μF, C OUT = 4.7μF, T A = 0°C to +85°C , unless otherwise noted.
Typical values are at T A = +25°C.)
PARAMETER
IN Operating Voltage
Undervoltage Lockout Threshold
V IN rising or falling
CONDITIONS
MIN
2.7
2.25
TYP
2.45
MAX
5.5
2.60
UNITS
V
V
Undervoltage Lockout Hysteresis
35
mV
Supply Current
Shutdown Supply Current
Soft-Start Done Time
1MHz switching, no load
EN1 = EN2 = GND
EN1 = GND, EN2 = IN, I SET = 33μA
0.190
2.0
0.1
2.1
0.200
3.5
5
0.210
mA
μA
ms
SET Bias Voltage
SET Leakage in Shutdown
SET Current Range
SET to LED_ Current Ratio
LED_ to LED_ Current Matching
Maximum LED_ Sink Current
EN1 = IN, EN2 = GND, I SET = 67μA
EN1 = IN, EN2 = IN, I SET = 100μA
EN1 = EN2 = GND, V IN = 5.5V, V SET = 0 or 5.5V
I LED /I SET , I SET = 67μA, V LED_ = 1V
I SET = 67μA, V LED_ = 1V
I SET = 130μA, V LED_ = 1V
0.380
0.570
20
215
-3
28
0.400
0.600
0.01
230
0.3
30
0.420
0.630
1.00
130
245
+3
V
μA
μA
A/A
%
mA
I SET = 33μA (Note 1)
100
180
LED_ Dropout Voltage
I SET = 67μA (Note 2)
I SET = 100μA (Note 2)
200
230
360
410
mV
LED1 Regulation Voltage
(1.5x Mode)
LED Leakage in Shutdown
Maximum OUT Current
Open-Loop OUT Resistance
EN1 = GND, EN2 = IN, I SET = 33μA
EN1 = IN, EN2 = GND, I SET = 67μA
EN1 = IN, EN2 = IN, I SET = 100μA
EN1 = GND, EN2 = GND, V LED_ = 5.5V
IN ≥ 3.4V, OUT ≥ 3.9V
1x mode (V IN - V OUT )/I OUT
1.5x mode (1.5V IN - V OUT )/I OUT
185
277
360
150
200
300
400
0.01
1.00
215
323
440
1.00
1.75
8
mV
μA
mA
?
Switching Frequency
1
MHz
EN1, EN2 High Voltage
EN1, EN2 Low Voltage
IN = 2.7V to 5.5V
IN = 2.7V to 5.5V
1.6
0.4
V
V
EN1, EN2 Input Current
EN_ = GND or 5.5V
0.01
1.00
μA
2
_______________________________________________________________________________________
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