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White LED Current Regulator with 1x/1.5x
High-Efficiency Charge Pump
Typical Operating Characteristics (continued)
(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 CURRENT vs. TEMPERATURE
20
18
LED CURRENT vs. SUPPLY VOLTAGE
12.0
11.9
(V IN = 3.3V, R SET = 7.5k ? )
30
LED CURRENT vs. R SET
16
14
12
EN1 = EN2 = V IN
11.8
11.7
11.6
25
20
E N1
2=I
, EN2
GN D, E N
10
8
6
4
2
EN1 = V IN , EN2 = GND
EN1 = GND, EN2 = V IN
11.5
11.4
11.3
11.2
11.1
EN1 = IN
EN2 = GND
15
10
5
EN1
EN1 =
= IN
= EN
= GND
2 = IN
N
0
11.0
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
-40
-15
10
35
60
85
5.0
7.5
10.0
12.5
15.0
SUPPLY VOLTAGE (V)
TYPICAL OPERATING WAVEFORM
TEMPERATURE ( ° C)
TYPICAL OPERATING WAVEFORM
R SET (k ? )
STARTUP RESPONSE (V IN = 3.3V)
IN 1X MODE
MAX1570 toc13
IN 1.5X MODE (I LOAD = 90mA, V IN = 3.6V)
MAX1570 toc14
(5 LEDs AT 15mA/LED)
MAX1570 toc15
I IN
I IN
I IN
AC-COUPLED
AC-COUPLED
10mA/div
50mA/div
10mA/div
V IN
V IN
AC-COUPLED
1mV/div
AC-COUPLED
20mV/div
2 μ s/div
V OUT
AC-COUPLED
1mV/div
DIMMING RESPONSE USING
400ns/div
V OUT
AC-COUPLED
5mV/div
400 μ s/div
V OUT
2V/div
PWM INTO EN1
100 μ s/div
MAX1570 toc16
I LED
15mA TO 5mA
5mA/div
V OUT
AC-COUPLED
500mV/div
EN1
0 TO 2V
2V/div
LINE-TRANSIENT RESPONSE
MAX1570 toc17
100 μ s/div
I LED
15mA
5mA/div
V OUT
AC-COUPLED
500mV/div
V IN
4 TO 3.6V
500mV/div
_______________________________________________________________________________________
5
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