Datasheet

LT3042
25
3042fb
For more information www.linear.com/LT3042
TYPICAL APPLICATIONS
Paralleling Multiple Devices Using ILIM (Current Monitor) to Cancel Ballast Resistor Drop
Ultralow 1/f Noise Reference Buffer
4.7µF
4.7µF
4.7µF
OUT
IN
SET
LT3042
V
OUT
= 5V
I
OUT(MAX)
200mA
100µA
OUTS
PGFB
ILIM
GND
PG
EN/UV
LTC6655-5
3042 TA08
+
–
1,2
3,4,5
6,7
10µF
49.9k
1k
V
IN
6V ±5%
4.7µF
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
4.7µF
50mΩ
1µF
22µF
OUT
IN
SET
LT3042
100µA
100µA
OUTS
PGFB
ILIM
GND
PG
EN/UV
IN
PGFB
PG
EN/UV
+
–
16.5k
R
ILIM
549Ω
R
CDC
10Ω
R
ILIM
= 125mA • kΩ/ILIM – R
CDC
• N
= 549Ω (FOR 200mA ILIM PER REGULATOR)
R
CDC
= R
BALLAST
• 400/N
= 10Ω
V
OUT
= 3.3V
I
OUT(MAX)
= 400mA
549Ω
50mΩ
+
–
3042 TA09
OUT
LT3042
OUTS
SET
ILIM
GND
V
IN
5V ±5%
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