PRODUCT DATASHEET
AAT3151B
TM
ChargePump
High Efficiency 1X/1.5X Charge Pump For White LED Applications
Typical Characteristics
3151B Backlight Efficiency vs. Supply Voltage
Turn-On to 1X Mode
(VIN = 4.2V; 20mA Load)
100
90
20mA
EN
(2V/div)
80
70
60
50
CP
(2V/div)
VSINK
(500mV/div)
1mA
10.2mA
40
IIN
(200mA/div)
30
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
Supply Voltage (V)
Time (100µs/div)
Turn-On to 1.5X Mode
(VIN = 3.5V; 20mA Load)
Turn-Off from 1.5X Mode
(VIN = 3.5V; 20mA Load)
EN
(2V/div)
EN
(2V/div)
CP
(2V/div)
VF
(1V/div)
VSINK
(500mV/div)
IIN
(100mA/div)
IIN
(200mA/div)
Time (100µs/div)
Time (500µs/div)
Current Matching vs. Temperature
20.4
Channel 2
20.2
20.0
Channel 4
19.8
Channel 3
Channel 1
19.6
19.4
19.2
19.0
-40
-20
0
20
40
60
80
Temperature (°C)
w w w . a n a l o g i c t e c h . c o m
3151B.2008.02.1.1
5
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