Datasheet

LT3012
14
3012fd
LT3012 Automotive Application
TYPICAL APPLICATIONS
LT3012 Telecom Application
Constant Brightness for Indicator LED over Wide Input Voltage Range
+
ADJ
OUTIN
SHDN
LT3012
GND
ON
OFF
1μF
3.3μF
750k
V
IN
12V
(LATER 42V)
LOAD: CLOCK,
SECURITY SYSTEM
ETC
+
–
ADJ
OUTIN
SHDN
LT3012
GND
ON
OFF
1μF
3.3μF
V
IN
48V
(72V TRANSIENT)
LOAD:
SYSTEM MONITOR
ETC
NO PROTECTION
DIODE NEEDED!
NO PROTECTION
DIODE NEEDED!
3012 TA05
BACKUP
BATTERY
249k
750k
249k
IN
LT3012
SHDN
1μF
RETURN
OFF ON
–48V
OUT
ADJ
GND
3012 TA06
3.3μF
R
SET
I
LED
= 1.24V/R
SET
–48V CAN VARY FROM –4V TO –80V