MAX1570 Maxim Integrated Products, MAX1570 Datasheet - Page 4

• Manufacturer Part Number: MAX1570
• Description: White LED Current Regulator
• Manufacturer: Maxim Integrated Products

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