Datasheet

LT1054/LT1054L
11
1954lfg
TYPICAL APPLICATIONS
5V to ±12V Converter
Bipolar Supply Doubler
Strain Gauge Bridge Signal Conditioner
V
IN
3.5V TO 15V
V
OUT
LT1054 • TAO7
+V
OUT
+
+
= 1N4001
V
IN
= 3.5V TO 15V
+V
OUT
≈ 2V
IN
– (V
L
+ 2V
DIODE
)
V
OUT
≈ –2V
IN
+ (V
L
+ 2V
DIODE
)
V
L
= LT1054 VOLTAGE LOSS
100µF
10µF
10µF
10µF
100µF
100µF
++
+
+
+
+
LT1054
FB/SHDN
CAP
+
GND
CAP
V
+
OSC
V
REF
V
OUT
20k
1N9141N914
V
IN
= 5V
TO PIN 4
LT1054 #1
V
OUT
≈ –12V
I
OUT
= 25mA
V
OUT
≈ 12V
I
OUT
= 25mA
LT1054 • TAO8
1k
2N2219
10µF
100µF
10µF
10µF
100µF
5µF
100µF
5µF
+
+
+
+
+
+
+
+
LT1054 #2
FB/SHDN
CAP
+
GND
CAP
V
+
OSC
V
REF
V
OUT
LT1054 #1
FB/SHDN
CAP
+
GND
CAP
V
+
OSC
V
REF
V
OUT
1µF
5V
1
2
3
8
200k
3k
100µF
TANTALUM
LT1054 • TAO9
0.022µF
+
2N2222
A = 125 FOR 0V TO 3V OUT FROM FULL-SCALE
BRIDGE OUTPUT OF 24mV
100k
100k
10k
ZERO
TRIM
5k
GAIN
TRIM
10k
10k
5V
40Ω
301k
1M
A1
1/2 LT1013
5k
6
5
4
7
10k
2N2907
INPUT TTL
OR CMOS
LOW FOR ON
350Ω
+
A2
1/2 LT1013
10µF
+
+
10µF
+
LT1054
FB/SHDN
CAP
+
GND
CAP
V
+
OSC
V
REF
V
OUT