Datasheet

LT1054
SWITCHED-CAPACITOR VOLTAGE CONVERTERS
WITH REGULATORS
SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004
21
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
V
CC
OSC
V
REF
V
OUT
HP5082-2810
V
O
= −5 V
I
O
= 0-200 mA
R2
200 kΩ
R1
39.2 kΩ
12 V
FB/SD
CAP+
GND
CAP−
LT1054 #2
V
CC
OSC
V
REF
V
OUT
LT1054 #1
CAP−
GND
CAP+
FB/SD
5 μF
10 Ω
1/2 W
10 μF
0.002 μF
10 μF
20 kΩ
200 μF
10 Ω
1/2 W
Pin numbers shown are for the P package.
R2 + R1
ǒ
Ť
V
OUT
Ť
V
REF
2
* 40 mV
) 1
Ǔ
+ R1
ǒ
Ť
V
OUT
Ť
1.21 V
) 1
Ǔ
+
1
2
4
8
7
6
5
3
1
2
4
8
7
6
5
3
+
+
+
+
Figure 28. Regulating 200-mA +12-V to −5-V Converter
AD558
Digital
Input
V
O
= −V
I
(Programmed)
LT1004-2.5
2.5 V
15 V
LT1054
V
OUT
V
REF
OSC
V
CC
CAP−
GND
CAP+
FB/SD
100 μF
10 μF
20 kΩ
20 kΩ
5 μF
Pin numbers shown are for the P package.
+
+
1
2
4
8
7
6
5
3
+
16
11
15
14 13 12
Figure 29. Digitally Programmable Negative Supply