ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢅ
ꢆ
ꢆ
ꢆꢇ ꢈ ꢁꢉ ꢊꢋꢌꢍꢉ ꢎꢏꢎꢉꢈ ꢁꢐ ꢑ ꢒꢐ ꢀꢁꢎꢓ ꢋ ꢉꢐ ꢔ ꢒꢋ ꢑꢁ ꢋꢑ
ꢇ ꢈꢁ ꢊ ꢑꢋꢓ ꢕ ꢀꢎꢁꢐ ꢑ
SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004
APPLICATION INFORMATION
V
IN
3.5 V to 15 V
+
2.2 µF
1
2
3
4
8
7
6
5
1
8
7
6
5
FB/SD
V
CC
FB/SD
CAP+
V
CC
HP5082-2810
2
CAP+ of
LT1054 #1
V
OUT
SET
CAP+
OSC
OSC
10 µF
LT1054 #2
+
10 µF
+
LT1054 #1
GND
3
4
GND
V
REF
V
REF
+
20 kΩ
10 µF
R1
40 kΩ
CAP−
V
V
OUT
CAP−
+
OUT
10 µF
+
10 µF
1N4002
1N4002
0.002 µF
10 µF
+
+
R2
500 kΩ
1N4002
1N4002
V
OUT
≅ 100 mA MAX
I
OUT
1N4002
100 µF
+
V
V
= 3.5 V to 15 V
IN
MAX ≈ −2 V + [LT1054 Voltage Loss +2 (V
)]
OUT
IN Diode
ŤV
Ť
) 1
ŤV
Ť
OUT
OUT
R2 + R1
) 1 + R1
ǒ Ǔ
ǒ Ǔ
V
1.21 V
REF * 40 mV
2
Pin numbers shown are for the P package.
Figure 23. 100-mA Regulating Negative Doubler
17
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265