ꢀꢁ ꢂꢃ ꢄꢅ
ꢆ ꢇꢈ ꢁ ꢉꢊ ꢋꢌ ꢍꢉ ꢎ ꢏꢎꢉ ꢈ ꢁꢐ ꢑ ꢒ ꢐꢀꢁꢎꢓ ꢋ ꢉꢐ ꢔ ꢒꢋꢑꢁ ꢋ ꢑꢆ
ꢇꢈ ꢁ ꢊ ꢑ ꢋꢓꢕ ꢀ ꢎꢁꢐ ꢑꢆ
SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004
APPLICATION INFORMATION
1
2
3
4
8
7
6
5
+
−
FB/SD
CAP+
GND
V
CC
V
OUT
OSC
+
LT1054
10 µF
V
IN
V
REF
Q
X
2 µF
+
CAP−
V
OUT
R
X
100 µF
+
V
V
= −3.5 V to −15 V
IN
= 2 V + (LT1054 Voltage Loss) + (Q Saturation Voltage)
OUT
IN
X
V
IN
Pin numbers shown are for the P package.
Figure 21. Negative-Voltage Doubler
V
IN
3.5 V to 15 V
1N4001
1N4001
+
+
+
10 µF
100 µF
V
OUT
8
7
6
5
1
FB/SD
CAP+
GND
V
CC
+
−
2
3
4
2 µF
OSC
LT1054
V
REF
V
= 3.5 V to 15 V
≈ 2 V − (V + 2 V
IN
= LT1054 Voltage Loss
IN
CAP−
V
OUT
V
V
)
Diode
OUT
L
L
Pin numbers shown are for the P package.
Figure 22. Positive-Voltage Doubler
16
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265