AAT3158
High Efficiency 1X/1.5X/2X Charge Pump
for White LED Applications
Typical Characteristics
Efficiency vs. Supply Voltage
Turn-On to 1X Mode
(VIN = 4.2V; 20mA/ch Load)
100
90
80
70
60
50
40
30
20mA/ch
VF = 3.4V
6mA/ch
VF = 3V
EN/SET
(2V/div)
VOUT
(2V/div)
VSINK
(1V/div)
IIN
500µA/ch
VF = 2.7V
(100mA/div)
2.7
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
4.5
Supply Voltage (V)
Time (100µs/div)
Turn-On to 1.5X Mode
(VIN = 3.5V; 20mA/ch Load)
Turn-On to 2X Mode
(VIN = 2.8V; 20mA/ch Load)
EN/SET
(2V/div)
EN/SET
(2V/div)
VOUT
(2V/div)
VOUT
(2V/div)
VSINK
(1V/div)
VSINK
(500mV/div)
IIN
IIN
(200mA/div)
(500mA/div)
Time (100µs/div)
Time (100µs/div)
Turn-Off from 1.5X Mode
(VIN = 3.5V; 20mA/ch Load)
Diode Current vs. Temperature
(20mA/channel)
22.0
21.5
21.0
EN/SET
(2V/div)
20.5
ID1
20.0
ID4
VF
(1V/div)
ID2
19.5
19.0
ID3
IIN
(100mA/div)
18.5
18.0
-40
-25
-10
5
20
35
50
65
80
95
Time (100µs/div)
Temperature (°C)
3158.2006.02.1.0
5
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