MAX8831 MAXIM [Maxim Integrated Products], MAX8831 Datasheet - Page 6

• Manufacturer Part Number: MAX8831
• Description: High-Efficiency, White LED Step-Up Converter with I2C Interface in 2mm x 2mm WLP
• Manufacturer: MAXIM [Maxim Integrated Products]

High-Efficiency, White LED Step-Up Converter
with I
6
(V
I
LED3
IN
140
120
100
80
60
40
20
_______________________________________________________________________________________
0
= 3.6V, V
= I
2.5
LED4
MAXIMUM OUTPUT CURRENT
3.0
DD
= I
vs. INPUT VOLTAGE
V
I
I
LED1
LED2
V
I
2
LED1
OUT
LED5
V
OUT
V
I
INPUT VOLTAGE (V)
3.5
= 1.8V, C
IN
LX
IN
C Interface in 2mm x 2mm WLP
LIGHT-LOAD SWITCHING WAVEFORMS
I
= 5mA, unless otherwise noted.)
LED1
4.0
= 2mA
SOFT-START RESPONSE
IN
4.5
= 1µF, C
20ms/div
200ns/div
5.0
OUT
5.5
= 1µF, C
MAX8831 toc12
MAX8831 toc10
-0.50
-1.00
-1.50
1.50
1.00
0.50
Typical Operating Characteristics (continued)
0
VDD
2.5
LED1, LED2: 8 LEDs
LED3 TO LED5: 9 LEDs AT 5mA
200mA/div
20V/div
0V
0mA
20mA/div
20mA/div
0mA
100mV/div
(AC-COUPLED)
20V/div
0V
100mV/div
(AC-COUPLED)
4mA/div
0mA
LED1, LED2 CURRENT ACCURACY
= 0.1µF, C
I
LED1
3.0
(I
vs. INPUT VOLTAGE
LED2
3.5
INPUT VOLTAGE (V)
= 25.25mA)
I
LED2
COMP
4.0
(I
LED1
= 0.22µF, L = TOKO 1098AS-100M, I
= 25.25mA)
4.5
V
I
I
V
I
I
LED1
LED2
LED1
LED2
OUT
V
OUT
V
LX
I
IN
IN
HEAVY-LOAD SWITCHING WAVEFORMS
5.0
I
LED1
= I
5.5
LED2
SHUTDOWN RESPONSE
= 25.25mA
200ns/div
40ms/div
-0.50
-1.00
-1.50
1.50
1.00
0.50
0
2.5
LED1, LED2: 8 LEDs AT 25.25mA
LED3 TO LED5: 9 LEDs
LED3-TO-LED5 CURRENT ACCURACY
I
LED4
3.0
(I
LED5
I
MAX8831 toc11
MAX8831 toc13
LED5
vs. INPUT VOLTAGE
= I
INPUT VOLTAGE (V)
3.5
(I
LED1
LED3
LED4
I
LED3
= 5mA)
200mV/div
(AC-COUPLED)
1V/div
(AC-COUPLED)
= I
20V/div
0V
20mA/div
0mA
20mA/div
0mA
20V/div
200mA/div
0mA
0mA
0V
20mA/div
20mA/div
4.0
= I
LED3
(I
LED4
LED2
= 5mA)
4.5
= I
LED5
= 25.25mA,
= 5mA)
5.0
5.5