AAT3143 Datasheet, PDF (5/11 Pages) Advanced Analogic Technologies – High Efficiency 1X/1.5X/2X Charge Pump with PWM Control for White LED Applications

AAT3143
High Efficiency 1X/1.5X/2X Charge Pump with
PWM Control for White LED Applications
Typical Characteristics
V_IN = 3.5V, C_IN = C_CP = C₁ = C₂ = 1µF, T_A = 25°C, unless otherwise noted.
Efficiency
(100% Duty Cycle, 4x20mA/channel)
100
Turn-On to 1X Mode
(V_IN = 4.2V)
90
80
70
60
50
40
30
2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2
V_EN
(1V/div)
V_CP
(2V/div)
V_LED
(2V/div)
I_IN
(100mA/div)
Input Voltage (V)
Time (50µs/div)
V_EN
(1V/div)
V_CP
(2V/div)
V_LED
(2V/div)
I_IN
(50mA/div)
Turn-On to 1.5X Mode
(V_IN = 3.5V)
Time (50µs/div)
V_EN
(1V/div)
V_CP
(2V/div)
V_LED
(2V/div)
I_IN
(50mA/div)
Turn-On to 2X Mode
(V_IN = 2.7V)
Time (50µs/div)
V_EN
(2V/div)
V_LED
(2V/div)
I_LED
(10mA/div)
LED Turn-On Delay
(PWM Frequency = 500Hz)
Time (5µs/div)
V_EN
(2V/div)
V_LED
(2V/div)
I_LED
(10mA/div)
LED Turn-On Delay
(PWM Frequency = 5kHz)
Time (1µs/div)
3143.2006.05.1.0
5