MAX8822 Maxim Integrated Products, MAX8822 Datasheet - Page 6

• Manufacturer Part Number: MAX8822
• Description: Ultra-Efficient Negative Charge-Pump LED Driver
• Manufacturer: Maxim Integrated Products

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Ultra-Efficient Negative Charge-Pump LED
Driver with Dual LDOs in 3mm x 3mm Thin QFN
6
(V
IN
_______________________________________________________________________________________
= 3.6V, V
EN_
I
LED_TOTAL
V
I
= V
LDO1
LDO1
V
I
80
70
60
50
40
30
20
10
IN
IN
0
0.01
IN
, Circuit of Typical Operating Circuit , T
POWER-SUPPLY REJECTION RATIO
LINE-TRANSIENT RESPONSE
0.1
LDO1 LOAD TRANSIENT
(NO MODE CHANGE)
vs. FREQUENCY
FREQUENCY (kHz)
1
20μs/div
1ms/div
10
I
V
LED_
3.7V
LDO1
I
C
OUT
OUT
100
Typical Operating Characteristics (continued)
MAX8822 toc18
MAX8822 toc16
= 24mA
= 10mA
= 2.8V
= 1μF
1000
20mV/div
(AC-COUPLED)
50mA/div
4.2V
500mV/div
(AC-COUPLED)
100mA/div
150mA
10mA
100mA/div
0mA
0mA
A
= +25°C, unless otherwise noted.)
I
LED_TOTAL
50μV/div
V
I
LDO2
LDO2
V
I
IN
IN
LINE-TRANSIENT RESPONSE
LDO2 LOAD TRANSIENT
LDO OUTPUT NOISE
(MODE CHANGE)
400μs/div
20μs/div
1ms/div
V
LDO
= 2.8V, I
I
V
LED_
3.4V
LDO
LDO2
MAX8822 toc17
MAX8822 toc19
= 24mA
= 28mA
= 1.8V
3.8V
500mV/div
(AC-COUPLED)
100mA/div
100mA/div
20mV/div
(AC-COUPLED)
50mA/div
0mA
0mA
150mA
10mA