E, I Grades .........................................–40°C to 125°C
MP Grade...........................................–55°C to 125°C
Storage Temperature Range...................–65°C to 150°C
Lead Temperature: Soldering, 10 sec .................... 300°C
(MSOP Package Only)
PIN CONFIGURATION
TOP VIEW
TOP VIEW
REF/BYP
I
MIN
FAULT
SHDN
IN
IN
1
2
3
4
5
6
12
11
10
9
8
7
I
MON
I
MAX
GND
ADJ
OUT
OUT
REF/BYP 1
I
MIN
2
FAULT
3
SHDN
4
IN 5
IN 6
MSE PACKAGE
12-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 45°C/W,
θ
JC
= 5°C/W TO 10°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
12 I
MON
11 I
MAX
13
GND
10 GND
9 ADJ
8 OUT
7 OUT
13
GND
DDB PACKAGE
12-LEAD (3mm 2mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 49°C/W,
θ
JC
= 13.5°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3050EMSE#PBF
LT3050IMSE#PBF
LT3050MPMSE#PBF
LT3050EDDB#PBF
LT3050IDDB#PBF
LEAD BASED FINISH
LT3050EMSE
LT3050IMSE
LT3050MPMSE
LT3050EDDB
LT3050IDDB
TAPE AND REEL
LT3050EMSE#TRPBF
LT3050IMSE#TRPBF
LT3050MPMSE#TRPBF
LT3050EDDB#TRPBF
LT3050IDDB#TRPBF
TAPE AND REEL
LT3050EMSE#TR
LT3050IMSE#TR
LT3050MPMSE#TR
LT3050EDDB#TR
LT3050IDDB#TR
PART MARKING*
3050
3050
3050
LFGC
LFGC
PART MARKING*
3050
3050
3050
LFGC
LFGC
PACKAGE DESCRIPTION
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead (3mm
×
2mm) Plastic DFN
12-Lead (3mm
×
2mm) Plastic DFN
PACKAGE DESCRIPTION
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead (3mm
×
2mm) Plastic DFN
12-Lead (3mm
×
2mm) Plastic DFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
3050f
2
LT3050
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum Input Voltage (Notes 3, 11)
ADJ Pin Voltage (Notes 3, 4)
Line Regulation (Note 3)
Load Regulation (Note 3)
Dropout Voltage
V
IN
= V
OUT(NOMINAL)
(Notes 5, 6)
CONDITIONS
I
LOAD
= 100mA
V
IN
= 2.2V, I
LOAD
= 1mA
2.2V < V
IN
< 15V, 1mA < I
LOAD
< 100mA (Note 15)
ΔV
IN
= 2.2V to 45V, I
LOAD
= 1mA
V
IN
= 2.2V, I
LOAD
= 1mA to 100mA
I
LOAD
= 1mA
I
LOAD
= 1mA
I
LOAD
= 10mA
I
LOAD
= 10mA
I
LOAD
= 50mA
I
LOAD
= 50mA
I
LOAD
= 100mA
I
LOAD
= 100mA
GND Pin Current
V
IN
= V
OUT(NOMINAL)
+ 0.6V (Notes 6, 7, 11)
I
LOAD
= 0mA
I
LOAD
= 1mA
I
LOAD
= 10mA
I
LOAD
= 50mA
I
LOAD
= 100mA
V
IN
= 12V, V
SHDN
= 0V
V
IN
= 12V
C
OUT
= 10μF, I
LOAD
= 100mA, V
OUT
= 600mV,
BW = 10Hz to 100kHz
C
OUT
= 10μF, C
BYP
= 0.01μF, I
LOAD
= 100mA, V
OUT
= 600mV
BW = 10Hz to 100kHz
V
OUT
= Off to On
V
OUT
= On to Off
V
SHDN
= 0V
V
SHDN
= 45V
V
IN
–V
OUT
= 2V (AVG), V
RIPPLE
= 0.5V
P-P
,
f
RIPPLE
= 120Hz, I
LOAD
= 100mA
V
IN
= 2.2V,
FAULT
Asserted, I
FAULT
= 100μA
FAULT
= 5V,
FAULT
Not Asserted
V
IN
= –45V, V
OUT
= 0
V
OUT
= 1.2V, V
IN
= 0
V
IN
= 2.2V, V
OUT
= 0, I
MAX
Pin Grounded
ΔV
OUT
= –5%
5.6V < V
IN
< 15V, V
OUT
= 5V, R
IMAX
= 2.26K
FAULT
Pin Threshold
5.6V < V
IN
< 15V, V
OUT
= 5V, R
IMAX
= 1.5K
FAULT
Pin Threshold
5.6V < V
IN
< 15V, V
OUT
= 5V, R
IMAX
= 1.15K
FAULT
Pin Threshold
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2)
MIN
594
588
TYP
1.6
600
0.25
0.2
110
195
280
340
45
60
175
0.85
2.2
0.17
12.5
90
30
0.7
0.6
0.9
70
85
140
0.01
0.2
240
110
47.8
72.1
94.4
50.4
75.9
99.3
52.9
79.7
104.3
mA
mA
mA
250
1
300
10
1.5
1
3
MAX
2.2
606
612
3
4
150
220
240
340
330
450
400
550
90
160
370
2
5.2
1
60
UNITS
V
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
μA
μA
μA
mA
mA
μA
nA
μV
RMS
μV
RMS
V
V
μA
μA
dB
mV
μA
μA
μA
mA
Quiescent Current in Shutdown
ADJ Pin Bias Current (Notes 3, 12)
Output Voltage Noise
Output Voltage Noise
Shutdown Threshold
SHDN
Pin Current (Note 13)
Ripple Rejection (Note 3)
FAULT
Pin Logic Low Voltage
FAULT
Pin Leakage Current
Input Reverse Leakage Current
Reverse Output Current (Note 14)
Internal Current Limit (Note 3)
External Programmed Current Limit (Note 8)
0.3
3050f
3
LT3050
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum I
MIN
Threshold Accuracy (Note 9)
I
MIN
Threshold Accuracy (Note 9)
Current Monitor Ratio (Note10)
Ratio = I
OUT
/I
MON
V
IMON
= V
OUT
= 5V, 5.6V < V
IN
< 15V
CONDITIONS
5.6V < V
IN
< 15V, V
OUT
= 5V, R
IMIN
= 110K
5.6V < V
IN
< 15V, V
OUT
= 5V, R
IMIN
= 11.3K
I
LOAD
= 5mA, 25mA, 50mA, 75mA, 100mA
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2)
MIN
0.9
9
95
TYP
1
10
100
MAX
1.1
11
105
UNITS
mA
mA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime. Absolute maximum input-to-output differential
voltage is not achievable with all combinations of rated IN pin and OUT pin
voltages. With the IN pin at 50V, the OUT pin may not be pulled below 0V.
The total differential voltage from IN to OUT must not exceed ±50V.
Note 2:
The LT3050 is tested and specified under pulse load conditions
such that T
J
~ T
A
. The LT3050E is 100% production tested at T
A
= 25°C.
Performance at –40°C and 125°C is assured by design, characterization
and correlation with statistical process controls. The LT3050I is
guaranteed over the full –40°C to 125°C operating junction temperature
range. The LT3050MP is 100% tested over the –55°C to 125°C operating
junction temperature range.
Note 3:
The LT3050 is tested and specified for these conditions with ADJ
pin connected to the OUT pin.
Note 4:
Maximum junction temperature limits operating conditions.
Regulated output voltage specifications do not apply for all possible
combinations of input voltage and output current. If operating at the
maximum input voltage, limit the output current range. If operating at the
maximum output current, limit the input voltage range.
Note 5:
Dropout voltage is the minimum differential IN-to-OUT voltage
needed to maintain regulation at a specified output current. In dropout,
the output voltage equals (V
IN
- V
DROPOUT
). For some output voltages,
minimum input voltage requirements limit dropout voltage.
Note 6:
To satisfy minimum input voltage requirements, the LT3050 is
tested and specified for these conditions with an external resistor divider
(60k bottom, 440k top) which sets V
OUT
to 5V. The external resistor
divider adds 10μA of DC load on the output. This external current is not
factored into GND pin current.
Note 7:
GND pin current is tested with V
IN
= V
OUT(NOMINAL)
+ 0.5V and a
current source load. GND pin current increases in dropout. See GND pin
current curves in the Typical Performance Characteristics section.
Note 8:
Current limit varies inversely with the external resistor value tied
from the I
MAX
pin to GND. For detailed information on how to set the
I
MAX
pin resistor value, please see the Operation section. If a programmed
current limit is not needed, the I
MAX
pin must be tied to GND and internal
protection circuitry implements short-circuit protection as specified.
Note 9:
The I
MIN
fault condition asserts if the output current falls below the
I
MIN
threshold defined by an external resistor from the I
MIN
pin to GND.
For detailed information on how to set the I
MIN
pin resistor value, please
see the Operation section. I
MIN
settings below the Minimum I
MIN
Accuracy
specification in the Electrical Characteristics section are not guaranteed
to ± 10% tolerance. If the I
MIN
fault condition is not needed, the I
MIN
pin
must be left floating (unconnected).
Note 10:
The current monitor ratio varies slightly when V
IMON
≠ V
OUT
. For
detailed information on how to calculate the output current from the I
MON
pin, please see the Operation section. If the current monitor function is not
needed, the I
MON
pin must be tied to GND.
Note 11:
To satisfy requirements for minimum input voltage, current limit
is tested at V
IN
= V
OUT(NOMINAL)
+1V or V
IN
= 2.2V, whichever is greater.
Note 12:
ADJ pin bias current flows out of the ADJ pin:
Note 13:
SHDN
pin current flows into the
SHDN
pin.
Note 14:
Reverse output current is tested with the IN pin grounded and the
OUT pin forced to the specified voltage. This current flows into the OUT pin
and out of the GND pin.
Note 15:
100mA of output current does not apply to the full range of input
voltage due to the internal current limit foldback.
1、引言 汽车污染是当前人们最为关心和急需解决的重要课题之一。作为汽车排气污染物的检测的重要方法,简易瞬态工况法（VMAS法，IG法）可以统计排放总质量，监控车辆的真实排放情况，设备成本不高，测量比较准确，与新车认证检测结果具有相关性，可以检测NO相关因子等一系列优点，成为人们研究的热点。VMAS（Vehicle Mass Analysis System）检测方法在美国和欧洲都有很好的应用基础，...[详细]
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