Datasheet

LT3050 Series
14
3050fa
For detailed information on how to set the I
MAX
pin resistor
value, please see the Operation section.
The I
MAX
pin requires a 10nF decoupling capacitor to
ground. If not used, tie I
MAX
to GND.
I
MON
(Pin 12): Output Current Monitor. This pin is the
collector of a PNP current mirror that outputs 1/100
th
PIN FUNCTIONS
of the power PNP current. When OUT = I
MON
, the pin
current exactly equals 1/100
th
that of the output current.
For detailed information on how to calculate the output
current from the I
MON
pin, please see the Operation section.
The I
MON
pin requires a small (22nF minimum) external
decoupling capacitor. If the I
MON
pin is not used, it must
be tied to GND.
BLOCK DIAGRAM
+
–
+
–
+
–
4
9
11
12
2
3
1
IN
5, 6
R1
R1
D1
Q3
QI
MIN
1/200
QI
MON
1/100
QI
MAX
1/200
QPOWER
1
I
MAX
I
MIN
FAULT
I
MON
QFAULT
U1
GND
10, 13
REF/BYP
SHDN
ADJ
30k
R4
OUT
IDEAL
DIODE
D3
Q2
D2
ERROR
AMPLIFIER
THERMAL/
CURRENT LIMITS
CURRENT
LIMIT
AMPLIFIER
100k
R3
I
MIN
COMPARATOR
100k
R2
600mV
REFERENCE
3050 BD01
OUT
7, 8
+
–
R2
FIXED V
OUT
R1 R2
3.3V 60k 270k
5V 60k 440k