MAX1575 Maxim Integrated Products, MAX1575 Datasheet - Page 4

• Manufacturer Part Number: MAX1575
• Description: White LED 1x/1.5x Charge Pump
• Manufacturer: Maxim Integrated Products

V
OUT
V
I
IN
IN
White LED 1x/1.5x Charge Pump
for Main and Sub-Displays
4
(V
OPERATING WAVEFORMS (1.5x)
IN
123
122
121
120
119
118
117
_______________________________________________________________________________________
= 3.6V, ENM = ENS = IN, circuit of
2.7
OUTPUT CURRENT vs. SUPPLY VOLTAGE
DRIVING SIX LEDs AT 20mA EACH
3.1
400ns/div
3.5
SUPPLY VOLTAGE (V)
AND V
V
V
3.9
I
ENM
OUT
OUT
ENS
MAX1575 toc10
4.3
4.7
200mV/div
AC-COUPLED
50mV/div
AC-COUPLED
50mA/div
0
DIMMING RESPONSE
5.1
10ms/div
5.5
Figure
AND V
V
V
2, T
ENM
ENS
OUT
100
I
10
Typical Operating Characteristics (continued)
IN
1
A
1
MAX1575 toc13
= +25°C, unless otherwise noted.)
100% BRIGHTNESS SETTING
STARTUP WAVEFORMS
LED CURRENT vs. R
2V/div
50mA/div
0
2V/div
R
1ms/div
SET
10
(kΩ)
V
I
OUT
OUT
V
SET
IN
MAX1575 toc11
LINE TRANSIENT 3.8V TO 3.3V TO 3.8V
100
5V/div
100mA/div
0
2V/div
0
40µs/div
V
V
V
ENM
OUT
OUT
V
I
I
IN
IN
IN
MAIN STARTUP WITH SUB-DISPLAY ON
OPERATING WAVEFORMS (1x)
MAX1575 toc14
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400ns/div
1V/div
1V/div
AC-COUPLED
50mA/div
0mA
1ms/div
MAX1575 toc09
MAX1575 toc12
200mV/div
AC-COUPLED
50mV/div
AC-COUPLED
50mA/div
0mA
5V/div
100mA/div
0
500mV/div