LT1610
U
TYPICAL APPLICATIONS
3.3V TO 8V/70mA, –8V/5mA, 24V/5mA TFT LCD Bias Supply Uses All Ceramic Capacitors
D2
V
OFF
–8V
5mA
1µF
D3
V
ON
24V
0.22µF
5mA
0.22µF
0.22µF: TAIYO YUDEN EMK212BJ224MG
1µF
1µF
D4
1µF: TAIYO YUDEN LMK212BJ105MG
4.7µF: TAIYO YUDEN LMK316BJ475ML
D1: MOTOROLA MBRO520
0.22µF
D2, D3, D4: BAT54S
L1: SUMIDA CDRH5D185R4
L1
5.4µH
D1
V
IN
3.3V
AV
8V
DD
6
5
V
SW
IN
70mA
8
2
3
1
COMP
SHDN
274k
C1
4.7µF
C2
4.7µF
LT1610
FB
PGND
4
V
C
GND
100k
51pF
48.7k
7
1610 TA18
TFT LCD Bias Supply Transient Response
AVDD
200mV/DIV
VON
500mV/DIV
VOFF
200mV/DIV
70mA
AVDD LOAD
25mA
VON LOAD = 5mA
OFF LOAD = 5mA
200µs/DIV
1610 TA19
V
13