AAT1239-1_0810 Datasheet, PDF (22/23 Pages) Advanced Analogic Technologies – 40V Step-Up Converter for 4 to 10 White LEDs

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PRODUCT DATASHEET
AAT1239-1
40V Step-Up Converter for 4 to 10 White LEDs
Li-Ion
VIN = 3.0V
to 4.2V
C1
4.7μF
PVIN
LIN
VIN
SW
AAT1239-1
PGND
OVP
EN/SET
FB
SEL
AGND
C1 10V 0805 X5R 4.7μF GRM219R61A475KE19
C2 50V 1206 X7R 2.2μF GRM31CR71H225KA88
L1 10μH CDRH3D18-100NC
DS1 SS16L
L1
10μH
DS1
R2
374kΩ
R3
12kΩ
D1
D2
C2
2.2μF ^D3
D4
D5
D6
R1
30.1Ω
D10 D9 D8 D7
20mA
90.0
87.5
85.0
82.5
80.0
77.5
75.0
VIN = 3.0V
72.5
VIN = 3.6V
VIN = 4.2V
70.0
2
4
6
8
10 12 14 16 18 20
I_OUT (mA)
Figure 15: Enhanced Efficiency Configuration for Li-ion Battery Ten WLEDs Series-Connected Application.
Li-Ion
VIN=3.0V
to 4.2V
C1
4.7μF
PVIN
LIN
VIN
SW
AAT1239 -1
OVP
PGND
EN/SET
FB
SEL
AGND
C1 10V 0805 X5R 4.7μF GRM219R61A475KE19
C2 50V 1206 X7R 2.2μF GRM31CR71H225KA88
L1 4.7μH CDRH4D22/HP-4R7
DS1 SS16L
L1
4.7μH
DS1
R2
374kΩ
R3
12kΩ
R1
15Ω
40mA
D1
C2
D2
2.2μF
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
85.0
82.5
80.0
77.5
75.0
72.5
70.0
67.5
65.0
5
VIN = 3.0V
VIN = 3.6V
V_IN = 4.2V
10
15
20
25
30
35
40
I_OUT (mA)
Figure 16: Enhanced Efficiency Configuration for Li-ion Battery, Two Branch,
Ten WLEDs Series-Connected Application.
22
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1239-1.2008.10.1.2