Rainbow Electronics MAX8645Y - Manual (Page 7)

MAX8645X/MAX8645Y
1x/1.5x/2x White LED Charge Pumps with Two
LDOs in 4mm x 4mm TQFN
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SINGLE-WIRE DIMMING RESPONSE
MAX8645Y toc19
5V/div
0V
500mA/div
2V/div
0A
0V
V ENM1,
V ENM2
I OUT
V OUT
10ms/div
LDO DROPOUT VOLTAGE
vs. OUTPUT CURRENT
MAX8645Y toc20
OUTPUT CURRENT (mA)
DROPOUT VOLTAGE (mV)
150 100 50
20
40
60
80
100
120
140
0
0 200
LDO OUTPUT VOLTAGE
ACCURACY vs. OUTPUT CURRENT
MAX8645Y toc21
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE ACCURACY (%)
150 100 50
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1.0
-1.0
0 200
LOAD-TRANSIENT RESPONSE
MAX8645Y toc22
50mV/div
AC-COUPLED
100mA
1mA
V LDO_
I LDO_
10 μs/div
V LDO_ = 2.6V
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
MAX8645Y toc23
50mV/div
AC-COUPLED
100mA
1mA
V LDO_
I LDO_
10 μs/div
V
IN
- V
OUT
= 77mV, V
LDO_
= 2.6V
Typical Operating Characteristics (continued)
(V IN = V EN_ = 3.6V, circuit of Figure 2, T A = +25°C, unless otherwise noted.)