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| AAT2805 Datasheet, PDF (7/17 Pages) Advanced Analogic Technologies – Dual High Efficiency Charge Pump for White LED and Flash Applications | |||
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AAT2805
Dual High Efficiency Charge Pump
for White LED and Flash Applications
Typical CharacteristicsâWhite LED Backlight Driver Section
Turn-On to 1X Mode
(VIN = 4.2V; 20mA Load)
Turn-On to 1.5X Mode
(VIN = 3.5V; 20mA Load)
EN
(2V/div)
CP
(2V/div)
VSINK
(500mV/div)
IIN
(200mA/div)
100µs/div
EN
(2V/div)
CP
(2V/div)
VSINK
(500mV/div)
IIN
(200mA/div)
100µs/div
EN
(2V/div)
CP
(2V/div)
VSINK
(500mV/div)
IIN
(200mA/div)
Turn-On to 2X Mode
(VIN = 2.8V; 20mA Load)
100µs/div
EN
(2V/div)
VF
(1V/div)
IIN
(100mA/div)
Turn-Off from 1.5X Mode
(VIN = 3.5V; 20mA Load)
500µs/div
Efficiency vs. Supply Voltage
100
90
4.1mA
80
VF = 2.9V
70
60
50
40
1mA
10.2mA
30
VF = 2.7V
VF = 3.1V
20mA
VF = 3.4V
20
10
0
2.6 2.8 2.9 3.1 3.2 3.4 3.6 3.7 3.9 4.0 4.2
Supply Voltage (V)
Current Matching vs. Temperature
20.4
20.2 Channel 2
20.0
Channel 4
19.8
19.6
Channel 3 Channel 1
19.4
19.2
19.0
-40
-20
0
20
40
60
80
Temperature (°C)
2805.2005.05.1.2
7
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