Datasheet

LT3045
26
Rev. B
For more information www.analog.com
TYPICAL APPLICATIONS
Paralleling Multiple Devices Using ILIM (Current Monitor) to Cancel Ballast Resistor Drop
Ultralow 1/f Noise Reference Buffer
10µF
4.7µF
4.7µF
OUT
IN
SET
LT3045
V
OUT
= 5V
I
OUT(MAX)
500mA
100µA
OUTS
PGFB
ILIM
GND
PG
EN/UV
LTC6655-5
3045 TA07
+
–
1,2
3,4,5
6,7
10µF
49.9k
1k
V
IN
6V ±5%
10µF
N = NUMBER OF DEVICES IN PARALLEL
R
CDC
= CABLE (BALLAST RESISTOR) DROP CANCELLATION RESISTOR
R
ILIM
= CURRENT LIMIT PROGRAMMING RESISTOR
R
BALLAST
= BALLAST RESISTOR
ILIM = OUTPUT CURRENT LIMIT
10µF
20mΩ
1µF
10µF
OUT
IN
SET
LT3045
100µA
100µA
OUTS
PGFB
ILIM
GND
PG
EN/UV
IN
PGFB
PG
EN/UV
+
–
16.5k
R
ILIM
287Ω
R
CDC
5Ω
R
ILIM
= 150mA • kΩ/ILIM – R
CDC
• N
= 287Ω (FOR 500mA ILIM PER REGULATOR)
R
CDC
= R
BALLAST
• 500/N
= 5Ω
V
OUT
= 3.3V
I
OUT(MAX)
= 1A
287Ω
20mΩ
+
–
3045 TA08
OUT
LT3045
OUTS
SET
ILIM
GND
V
IN
5V ±5%
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