AAT3157 Datasheet, PDF (5/11 Pages) Advanced Analogic Technologies – High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications

AAT3157
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
Typical Characteristics
C_IN = C_OUT = C₁ = C₂ = 1.0µF; T_A = 25°C, V_IN = 3.6V, unless otherwise noted.
Efficiency vs. Supply Voltage
100
90
80
70
60
5mA/ch
10mA/ch
20mA/ch
50
V_F = 2.7V
VF = 3.1V
V_F = 3.4V
40
30
2.7
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
Supply Voltage (V)
EN/SET
(2V/div)
V_OUT
(2V/div)
V_SINK
(2V/div)
I_IN
(100mA/div)
Turn-On to 1X Mode
(V_IN = 4.2V; 20mA/ch Load)
Time (100μs/div)
EN/SET
(2V/div)
V_OUT
(2V/div)
V_SINK
(2V/div)
I_IN
(100mA/div)
Turn-On to 1.5X Mode
(V_IN = 3.5V; 20mA/ch Load)
Time (100µs/div)
EN/SET
(2V/div)
V_OUT
(2V/div)
V_SINK
(2V/div)
I_IN
(200mA/div)
Turn-On to 2X Mode
(V_IN = 2.8V; 20mA/ch Load)
Time (100µs/div)
EN/SET
(2V/div)
V_LED
(1V/div)
I_IN
(100mA/div)
Turn-Off to 1.5X Mode
(V_IN = 3.5V; 20mA/ch Load)
Time (100µs/div)
Diode Current vs. Temperature
(20mA/ch)
22.0
21.5
21.0
20.5
I_D1
20.0
I_D2
19.5
19.0
I_D3
18.5
18.0
-40 -25 -10
5
20
35
50
65
80
Temperature (°C)
3157.2006.05.1.2
5