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1x/1.5x/2x White LED Charge Pump with Two
LDOs in 4mm x 4mm Thin QFN
Typical Operating Characteristics (continued)
(V IN = V EN_ = 3.6V, circuit of Figure 1, T A = +25°C, unless otherwise noted.)
LDO DROPOUT VOLTAGE
SINGLE-WIRE DIMMING RESPONSE
MAX8631X toc19
140
vs. OUTPUT CURRENT
V ENM1,
V ENM2
I OUT
5V/div
0V
500mA/div
0A
120
100
80
60
40
V OUT
2V/div
0V
20
0
10ms/div
0
50
100
150
200
OUTPUT CURRENT (mA)
LDO OUTPUT VOLTAGE
1.0
0.8
ACCURACY vs. OUTPUT CURRENT
LOAD-TRANSIENT RESPONSE
MAX8631X toc22
V LDO_ = 2.6V
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
V LDO_
I LDO_
50mV/div
AC-COUPLED
100mA
1mA
0
50
100
150
200
10 μ s/div
OUTPUT CURRENT (mA)
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
MAX8631X toc23
V IN - V OUT = 77mV, V LDO_ = 2.6V
V LDO_
50mV/div
AC-COUPLED
100mA
I LDO_
1mA
10 μ s/div
_______________________________________________________________________________________
7
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