Datasheet

1µF/
35V
C1
C2
C3
C4
C8
1 µF
35 V
D4
5
6
7
D8
BZX84C 20V
V
-7 V/ 20 mA
GL
V
GH
20 V/20 mA
D2
BAT54S
D3
BAT54S
BAT54S
D
BAT54S
D
BAT54S
D
BAT54S
3* V
S
2*
V
S
T1
BC857B
T2
BC850B
R10
13
kΩ
100nF/
50V
nF
C5
100
50 V
100 nF
50 V
C6
470 nF
50 V
C7
470 nF
50 V
-V
S
V
IN
3.3 V± 20%
18 kΩ
113
kΩ
3.3µH
27 kΩ
1.6 nF
V
S
9 V/500 mA
D
L
R2
R1
R
COMP
PMEG2010AEH
C
SS
100 nF
C
OUT
2*10 µF
25 V
VIN
EN
SW
FB
C
IN
FREQ
GND
COMP
10
µF
16 V
SS
1
4
56
3 2
7
TPS 61085
8
C
BY
1 µF
16 V
C
COMP
R8
7 kΩ
470 nF
25 V
D1
BZX84C7V5
IN
EN
SW
D
FB
FREQ
COMP
SL22
SS
1
4
5
6
3
2
PGND
7
8
TPS61085
V
5 V ± 20%
IN
C
10 µF/
16 V
IN
C
1 µF/ 16 V
BY
L
6.8 µH
C
100 nF
SS
R
24 k
COMP
Ω
C
3.3 nF
COMP
R
15
SENSE
Ω
C
2* 10 µF/
25 V
OUT
V
500 mA
S
3S3P wLED
LW E67C
D
BZX84C 18 V
Z
R
110
LIMIT
Ω
optional
TPS61085
SLVS859A –JUNE 2008–REVISED APRIL 2012 www.ti.com
TFT LCD Application Circuit
Figure 19. Typical Application 3.3 V to 9 V (f
S
= 1.2 MHz) for TFT LCD with External Charge Pumps (VGH,
VGL)
WHITE LED Application Circuits
Figure 20. Simple Application (3.3V input - f
sw
= 650 kHz) for wLED Supply (3S3P) (with Optional
Clamping Zener Diode)
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Product Folder Link(s): TPS61085