Datasheet

LT1054
SWITCHED-CAPACITOR VOLTAGE CONVERTERS
WITH REGULATORS
SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004
17
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
R2
500 kΩ
V
IN
3.5 V to 15 V
CAP+ of
LT1054 #1
HP5082-2810
1N4002
1N4002
1N4002
V
OUT
SET
R1
40 kΩ
1N4002
LT1054 #1
V
OUT
V
REF
OSC
V
CC
CAP−
GND
CAP+
FB/SD
V
OUT
V
REF
OSC
V
CC
CAP−
GND
CAP+
FB/SD
V
OUT
I
OUT
≅ 100 mA MAX
10 μF
2.2 μF
20 kΩ
0.002 μF
10 μF
100 μF
10 μF
10 μF
10 μF
10 μF
1N4002
V
IN
= 3.5 V to 15 V
V
OUT
MAX ≈ −2 V
IN
+ [LT1054 Voltage Loss +2 (V
Diode
)]
LT1054 #2
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
3
4
8
7
6
5
+
1
2
3
4
8
7
6
5
+
+
+
+
+
+
+
+
Figure 23. 100-mA Regulating Negative Doubler