LTC1261CS8-4.5#TRPBF Linear Technology, LTC1261CS8-4.5#TRPBF Datasheet - Page 14
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LTC1261CS8-4.5#TRPBF
Manufacturer Part Number
LTC1261CS8-4.5#TRPBF
Description
IC SW CAP/INV -4.5V 15MA 8SOIC
Manufacturer
Linear Technology
Type
Switched Capacitor (Charge Pump), Invertingr
Datasheet
1.LTC1261CS8-4PBF.pdf
(16 pages)
Specifications of LTC1261CS8-4.5#TRPBF
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
-4.5V
Current - Output
15mA
Frequency - Switching
550kHz
Voltage - Input
3 ~ 8 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
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This circuit uses the LTC1261CS8 to generate a – 1.24V
output at 20mA. Attached to this output is a 312 resistor
to make the current/voltage conversion. 4mA through
312
through 312 gives 6.24V across the resistor, giving a net
5V output. If the 4mA to 20mA source requires an operat-
ing voltage greater than 8V, it should be powered from a
LTC1261
TYPICAL APPLICATIONS
14
generates 1.24V, giving a net 0V output. 20mA
TO 20mA
SENSOR
– 1.24V Generator for 4mA-20mA to 0V-5V Conversion
4mA
U
+
–
N
PROTECTION
OPTIONAL
DIODES
INPUT
–1.24V
1N5817
separate supply; the LTC1261 can then be powered from
any convenient supply, 3V V
prevents the external voltage from damaging the LTC1261
in shutdown or under fault conditions. The LTC1261’s
reference is trimmed to 3.5% and the resistor adds 1%
uncertainty, giving 4.5% total output error.
+
312
1%
3.3 F
6
5
OUT
ADJ
LTC1261
GND
V
8V
CC
1
4
C1
C1
+
–
2
3
0V TO 5V
LTC1261 • TA11
5%
1 F
0.1 F
S
8V. The Schottky diode