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MAX1570
White LED Current Regulator with 1x/1.5x
High-Efficiency Charge Pump
4 _______________________________________________________________________________________
Typical Operating Characteristics
(EN1 = EN2 = IN, C
IN
= 1µF, C1 = C2 = 1µF, C
OUT
= 4.7µF, R
SET
= 9.09kΩ, T
A
= +25°C, unless otherwise noted.)
LED EFFICIENCY vs. SUPPLY VOLTAGE
(4 LEDs)
MAX1570 toc01
SUPPLY VOLTAGE (V)
EFFICIENCY P
LED
/P
SUPPLY
(%)
4.03.83.63.43.2
55
60
65
70
75
80
85
90
95
100
50
3.0 4.2
15mA/LED,
EN1 = EN2 = V
IN
5mA/LED, EN1 = GND,
EN2 = V
IN
10mA/LED, EN1 = V
IN
, EN2 = GND
SUPPLY POWER vs. SUPPLY VOLTAGE
(4 LEDs)
MAX1570 toc02
SUPPLY VOLTAGE (V)
SUPPLY POWER (mW)
5.04.54.03.53.02.5 5.5
50
100
150
200
250
300
350
400
0
15mA/LED,
EN1 = EN2 = V
IN
5mA/LED, EN1 = GND,
EN2 = V
IN
10mA/LED, EN1 = V
IN
,
EN2 = GND
SUPPLY CURRENT (mA)
4.54.03.53.0
10
20
30
40
50
60
70
80
90
100
0
2.5 5.0
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(4 LEDs)
MAX1570 toc03
SUPPLY VOLTAGE (V)
15mA/LED,
EN1 = EN2 = V
IN
5mA/LED, EN1 = GND,
EN2 = V
IN
10mA/LED, EN1 = V
IN
,
EN2 = GND
LED EFFICIENCY vs. SUPPLY VOLTAGE
(5 LEDs)
MAX1570 toc04
SUPPLY VOLTAGE (V)
EFFICIENCY P
LED
/P
SUPPLY
(%)
4.03.83.63.43.2
55
60
65
70
75
80
85
90
95
100
50
3.0 4.2
15mA/LED,
EN1 = EN2 = V
IN
5mA/LED, EN1 = GND,
EN2 = V
IN
10mA/LED, EN1 = V
IN
, EN2 = GND
SUPPLY POWER (mW)
4.54.03.53.0
50
100
150
200
250
300
350
400
450
500
0
2.5 5.0
SUPPLY POWER vs. SUPPLY VOLTAGE
(5 LEDs)
MAX1570 toc05
SUPPLY VOLTAGE (V)
15mA/LED,
EN1 = EN2 = V
IN
5mA/LED, EN1 = GND,
EN2 = V
IN
10mA/LED, EN1 = V
IN
,
EN2 = GND
20
40
60
80
100
120
0
SUPPLY CURRENT (mA)
4.54.03.53.02.5 5.0
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(5 LEDs)
MAX1570 toc06
SUPPLY VOLTAGE (V)
15mA/LED,
EN1 = EN2 = V
IN
5mA/LED, EN1 = GND,
EN2 = V
IN
10mA/LED, EN1 = V
IN
,
EN2 = GND
EFFICIENCY vs. LED CURRENT
(4 LEDs, EN1 = PWM AT 1kHz)
MAX1570 toc07
LED CURRENT (mA)
EFFICIENCY P
LED
/P
SUPPLY
(%)
141311 127 8 9 106
55
60
65
70
75
80
85
90
95
100
50
515
V
IN
= 3.9V
V
IN
= 3V
LED CURRENT vs. PWM DIMMING
DUTY CYCLE INTO EN1 (5 LEDs)
MAX1570 toc08
PWM DUTY CYCLE (%)
LED CURRENT (mA)
908060 7020 30 40 5010
2
4
6
8
10
12
14
16
18
20
0
0 100
f
PWM
= 1kHz
V
IN
= 3.3V
20
40
60
80
100
120
0
SUPPLY CURRENT (mA)
4.54.03.53.02.5 5.0
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(4 LEDs, LED1 OPEN FOR 1.5X ONLY MODE)
MAX1570 toc09
SUPPLY VOLTAGE (V)
15mA/LED,
EN1 = EN2 = V
IN
5mA/LED, EN1 = GND,
EN2 = V
IN
10mA/LED, EN1 = V
IN
,
EN2 = GND