AAT2803 Datasheet, PDF (8/16 Pages) Advanced Analogic Technologies – Six-Channel White LED Backlight Charge Pump with Flash

AAT2803
Six-Channel White LED Backlight
Charge Pump with Flash
Typical Characteristics–White LED Backlight Driver Section
Unless otherwise noted, V_IN = 3.6V, C_IN = C_OUT = C₁ = C₂ = C₃ = 1.0μF; T_A = 25°C.
Efficiency vs. Supply Voltage
100
90
80
70
60
50
2.8
4.1mA
V_F = 2.9V
10.2mA
V_F = 3.1V
20mA
V_F = 3.4V
3.0
3.2
3.4
3.6
3.8
4.0
4.2
Supply Voltage (V)
EN
(2V/div)
CP
(2V/div)
V_SINK
(500mV/div)
I_IN
(200mA/div)
Turn-On to 1X Mode
(V_IN = 4.2V; 20mA Load)
100μs/div
EN
(2V/div)
CP
(2V/div)
V_SINK
(500mV/div)
I_IN
(200mA/div)
Turn-On to 1.5X Mode
(V_IN = 3.8V; 20mA Load)
100μs/div
EN
(2V/div)
CP
(2V/div)
V_SINK
(500mV/div)
I_IN
(200mA/div)
Turn-On to 2X Mode
(V_IN = 2.8V; 20mA Load)
100μs/div
EN
(2V/div)
V_F
(1V/div)
I_IN
(100mA/div)
Turn-Off from 1.5X Mode
(V_IN = 3.5V; 20mA Load)
100μs/div
Current Matching vs. Temperature
20.2
20.0
19.8
19.6
19.4
19.2
-40
Channel 2
Channel 1
Channel 5
Channel 3
Channel 4
Channel 6
-20
0
20
40
60
80
Temperature (°C)
8
2803.2006.12.1.6