MAX1574 查看數據表（PDF） - Maxim Integrated
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MAX1574 Datasheet PDF : 9 Pages
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180mA, 1x/2x, White LED Charge Pump
in 3mm x 3mm TDFN
Typical Operating Characteristics (continued)
(Circuit of Figure 2, VIN = 3.6V, EN = IN, driving three white LEDs, TA = +25°C, unless otherwise noted.)
1.0
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
2.7
LED CURRENT MATCHING
vs. INPUT SUPPLY VOLTAGE
ILED = 8mA
3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT SUPPLY VOLTAGE (V)
LED CURRENT vs. TEMPERATURE
8.20
8.15
8.10
8.05
8.00
7.95
7.90
7.85
7.80
-40 -15 10
35
60
85
TEMPERATURE (°C)
LED CURRENT vs. RSET
100
10
100% BRIGHTNESS
SETTING
1
1
10
100
1000
RSET (kΩ)
OPERATING WAVEFORMS (1x)
MAX1574 toc07
OPERATING WAVEFORMS (2x)
MAX1574 toc08
VOUT
50mV/div
AC-COUPLED
20mV/div
VIN
AC-COUPLED
IIN
50mA/div
0mA
400ns/div
VOUT
50mV/div
AC-COUPLED
20mV/div
VIN
AC-COUPLED
IIN
50mA/div
0mA
400ns/div
STARTUP AND SHUTDOWN
MAX1574 toc09
VEN
5V/div
IIN
100mA/div
0mA
VOUT
2V/div
0V
1ms/div
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