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White LED Current Regulator with 1x/1.5x
High-Efficiency Charge Pump
Typical Operating Characteristics
(EN1 = EN2 = IN, C IN = 1μF, C1 = C2 = 1μF, C OUT = 4.7μF, R SET = 9.09k ? , T A = +25°C, unless otherwise noted.)
LED EFFICIENCY vs. SUPPLY VOLTAGE
(4 LEDs)
SUPPLY POWER vs. SUPPLY VOLTAGE
(4 LEDs)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(4 LEDs)
100
95
90
85
80
75
10mA/LED, EN1 = V IN , EN2 = GND
400
350
300
250
200
15mA/LED,
EN1 = EN2 = V IN
100
90
80
70
60
50
15mA/LED,
EN1 = EN2 = V IN
10mA/LED, EN1 = V IN ,
EN2 = GND
70
65
60
150
100
10mA/LED, EN1 = V IN ,
EN2 = GND
40
30
20
5mA/LED, EN1 = GND,
EN2 = V IN
55
50
5mA/LED, EN1 = GND,
EN2 = V IN
15mA/LED,
EN1 = EN2 = V IN
50
0
5mA/LED, EN1 = GND,
EN2 = V IN
10
0
3.0
3.2
3.4
3.6
3.8
4.0
4.2
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
100
SUPPLY VOLTAGE (V)
LED EFFICIENCY vs. SUPPLY VOLTAGE
(5 LEDs)
500
SUPPLY VOLTAGE (V)
SUPPLY POWER vs. SUPPLY VOLTAGE
(5 LEDs)
120
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(5 LEDs)
95
90
85
80
75
70
65
10mA/LED, EN1 = V IN , EN2 = GND
450
400
350
300
250
200
150
15mA/LED,
EN1 = EN2 = V IN
10mA/LED, EN1 = V IN ,
EN2 = GND
100
80
60
40
15mA/LED,
EN1 = EN2 = V IN
10mA/LED, EN1 = V IN ,
EN2 = GND
5mA/LED, EN1 = GND,
EN2 = V IN
60
55
50
5mA/LED, EN1 = GND,
EN2 = V IN
15mA/LED,
EN1 = EN2 = V IN
100
50
0
5mA/LED, EN1 = GND,
EN2 = V IN
20
0
3.0
3.2
3.4
3.6
3.8
4.0
4.2
2.5
3.0
3.5
4.0
4.5
5.0
2.5
3.0
3.5
4.0
4.5
5.0
100
SUPPLY VOLTAGE (V)
EFFICIENCY vs. LED CURRENT
(4 LEDs, EN1 = PWM AT 1kHz)
20
SUPPLY VOLTAGE (V)
LED CURRENT vs. PWM DIMMING
DUTY CYCLE INTO EN1 (5 LEDs)
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(4 LEDs, LED1 OPEN FOR 1.5X ONLY MODE)
120
95
90
18
16
f PWM = 1kHz
V IN = 3.3V
100
15mA/LED,
85
80
75
70
65
60
V IN = 3.9V
V IN = 3V
14
12
10
8
6
4
80
60
40
20
EN1 = EN2 = V IN
10mA/LED, EN1 = V IN ,
EN2 = GND
5mA/LED, EN1 = GND,
EN2 = V IN
55
2
50
0
0
5
6
7
8
9
10 11 12 13 14 15
0
10 20 30 40 50 60 70 80 90 100
2.5
3.0
3.5
4.0
4.5
5.0
LED CURRENT (mA)
PWM DUTY CYCLE (%)
SUPPLY VOLTAGE (V)
4
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