EXPOSED PAD (PIN 15) IS IN, MUST BE SOLDERED TO PCB
FE PACKAGE
16-LEAD PLASTIC TSSOP
T
JMAX
= 150°C,
θ
JA
= 25°C/W,
θ
JC
= 8°C/W
EXPOSED PAD (PIN 17) IS IN, MUST BE SOLDERED TO PCB
FRONT VIEW
FRONT VIEW
7
6
5
4
3
2
1
R PACKAGE
7-LEAD PLASTIC DD
T
JMAX
= 150°C,
θ
JA
= 15°C/W,
θ
JC
= 3°C/W
OUT
GND
SET
IN
SHDN
IMONN
ILIM
TAB
IS IN
TAB
IS IN
7
6
5
4
3
2
1
T7 PACKAGE
7-LEAD PLASTIC TO-220
T
JMAX
= 150°C,
θ
JA
= 34°C/W,
θ
JC
= 3°C/W
OUT
GND
SET
IN
SHDN
IMONN
ILIM
3091fa
2
For more information
www.linear.com/LT3091
LT3091
orDer inForMaTion
LEAD FREE FINISH
LT3091EDE#PBF
LT3091IDE#PBF
LT3091HDE#PBF
LT3091MPDE#PBF
LT3091EFE#PBF
LT3091IFE#PBF
LT3091HFE#PBF
LT3091MPFE#PBF
LT3091ER#PBF
LT3091IR#PBF
LT3091HR#PBF
LT3091MPR#PBF
LT3091ET7#PBF
LT3091IT7#PBF
LT3091HT7#PBF
LT3091MPT7#PBF
TAPE AND REEL
LT3091EDE#TRPBF
LT3091IDE#TRPBF
LT3091HDE#TRPBF
LT3091MPDE#TRPBF
LT3091EFE#TRPBF
LT3091IFE#TRPBF
LT3091HFE#TRPBF
LT3091MPFE#TRPBF
LT3091ER#TRPBF
LT3091IR#TRPBF
LT3091HR#TRPBF
LT3091MPR#TRPBF
N/A
N/A
N/A
N/A
(http://www.linear.com/product/LT3091#orderinfo)
PART MARKING*
3091
3091
3091
3091
3091FE
3091FE
3091FE
3091FE
LT3091R
LT3091R
LT3091R
LT3091R
LT3091T7
LT3091T7
LT3091T7
LT3091T7
PACKAGE DESCRIPTION
14-Lead (4mm
×
3mm) Plastic DFN
14-Lead (4mm
×
3mm) Plastic DFN
14-Lead (4mm
×
3mm) Plastic DFN
14-Lead (4mm
×
3mm) Plastic DFN
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
7-Lead Plastic DD-Pak
7-Lead Plastic DD-Pak
7-Lead Plastic DD-Pak
7-Lead Plastic DD-Pak
7-Lead Plastic TO-220
7-Lead Plastic TO-220
7-Lead Plastic TO-220
7-Lead Plastic TO-220
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°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/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
Minimum IN Voltage
(Note 11)
SET Pin Current (I
SET
)
Output Offset Voltage, V
OS
(V
OUT
– V
SET
)
CONDITIONS
I
LOAD
= 500mA
I
LOAD
= 1.5A
V
IN
= –1.9V, I
LOAD
= 1mA
–36V < V
IN
< –1.9V, 1mA < I
LOAD
< 1.5A (Note 5)
V
IN
= –1.9V, I
LOAD
= 1mA
–36V < V
IN
< –1.9V, 1mA < I
LOAD
< 1.5A (Note 5) (DFN, TSSOP)
–36V < V
IN
< –1.9V, 1mA < I
LOAD
< 1.5A (Note 5) (DD-PAK, TO-220)
l
l
l
l
elecTrical characTerisTics
MIN
–1.9
49.5
49
–1.2
–2
–3.5
TYP
–1.5
–1.5
50
50
MAX
UNITS
V
V
50.5
51
1.2
2
3.5
µA
µA
mV
mV
mV
nA/V
µV/V
Line Regulation:
∆I
SET
/∆V
IN
V
IN
= –1.9V to –36V, I
LOAD
= 1mA
Line Regulation:
∆V
OS
/∆V
IN
V
IN
= –1.9V to –36V, I
LOAD
= 1mA
Load Regulation:
∆I
SET
Load Regulation:
∆V
OS
I
LOAD
= 1mA to 1.5A
I
LOAD
= 1mA to 1.5A, V
IN
= –1.9V (Note 6)
l
1.5
2.5
2.0
1.2
5.0
nA
mV
Output Regulation with SET
Pin Voltage Change:
∆I
SET
/∆V
SET
V
SET
= 0V to –32V, V
IN
= –36V, I
LOAD
= 1mA
∆V
OS
/∆V
SET
V
SET
= 0V to –32V, V
IN
= –36V, I
LOAD
= 1mA
l
l
0.2
2.5
2
40
nA/V
µV/V
3091fa
For more information
www.linear.com/LT3091
3
LT3091
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
Dropout Voltage
V
IN
= V
OUT(NOMINAL)
(Note 7)
CONDITIONS
I
LOAD
= 1mA
I
LOAD
= 1mA
I
LOAD
= 100mA
I
LOAD
= 100mA
I
LOAD
= 500mA
I
LOAD
= 500mA
I
LOAD
= 1.5A
I
LOAD
= 1.5A
I
LOAD
= 1.5A
I
LOAD
= 1.5A
I
LOAD
= 20μA
I
LOAD
= 1mA
I
LOAD
= 100mA
I
LOAD
= 500mA
I
LOAD
= 1.5A
l
elecTrical characTerisTics
MIN
TYP
173
176
MAX
225
270
225
280
230
320
360
450
420
525
2.0
2.0
5.5
20
80
UNITS
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mA
mA
mA
mA
mA
μV
RMS
nA
RMS
dB
dB
dB
l
185
l
DFN and TSSOP
TO-220 and DD-Pak
GND Pin Current
V
IN
= V
OUT(NOMINAL)
(Note 8)
300
l
360
l
l
l
l
l
l
1.2
1.2
2.6
9.3
40
18
10
70
85
45
20
1.23
–1.27
180
190
21
–4.5
0.1
Error Amplifier RMS Output I
LOAD
= 1.5A, BW = 10Hz to 100kHz, C
OUT
= 10μF,
Noise (Note 12)
C
SET
= 0.1μF
Reference Current RMS
Output Noise (Note 12)
Ripple Rejection
V
IN
– V
OUT
= –1.5V (Avg)
SHDN
Pin Turn-ON
Threshold
SHDN
Pin Hysteresis
SHDN
Pin Current
(Note 10)
Quiescent Current in
Shutdown
Internal Current Limit
(Note 13)
BW = 10Hz to 100kHz
V
RIPPLE
= 500mV
P-P
, f
RIPPLE
= 120Hz, I
LOAD
= 100mA, C
OUT
= 10μF, C
SET
= 0.47μF
V
RIPPLE
= 50mV
P-P
, f
RIPPLE
= 10kHz, I
LOAD
= 1.5A, C
OUT
= 10μF, C
SET
= 0.47μF
V
RIPPLE
= 50mV
P-P
, f
RIPPLE
= 1MHz, I
LOAD
= 1.5A, C
OUT
= 10μF, C
SET
= 0.47μF
Positive
SHDN
Rising
Negative
SHDN
Rising (in Magnitude)
Positive
SHDN
Hysteresis
Negative
SHDN
Hysteresis
V
SHDN
= 0V
V
SHDN
= 15V
V
SHDN
= –15V
V
IN
= –6V, V
SHDN
= 0V
V
IN
= –6V, V
SHDN
= 0V
V
IN
= –1.9V, V
OUT
= 0V
V
IN
= –13V, V
OUT
= 0V
V
IN
= –36V, V
OUT
= 0V
V
IN
= –1.9V,
∆V
OUT
< 10mV
Programmable Scale Factor: –36V < V
IN
< –1.9V,
I
OUT
> 100mA (Note 14)
Max I
OUT
: V
IN
= –1.9V, R
ILIM
= 13.3k
Max I
OUT
: V
IN
= –1.9V, R
ILIM
= 40k
Positive Current Monitoring (IMONP) Scale Factor
I
OUT
= 500mA, V
IN
= –2.5V, V
IMONN
= 2V, V
IMONP
= 0V
I
OUT
= 1.5A, V
IN
= –2.5V, V
IMONN
= 2V, V
IMONP
= 0V
Negative Current Monitoring (IMONN) Scale Factor
I
OUT
= 500mA, V
IN
= –2.5V, V
IMONN
= 0V, V
IMONP
= –2.5V
I
OUT
= 1.5A, V
IN
= –2.5V, V
IMONN
= 0V, V
IMONP
= –2.5V
–36V < V
IN
< –1.9V
10ms Pulse
l
l
l
l
l
l
1.14
–1.36
1.32
–1.18
V
V
mV
mV
–7
±1
30
1
20
2200
120
2150
µA
µA
µA
µA
µA
mA
mA
mA
mA
A•kΩ
1600
20
1550
1900
840
65
1850
20
Programmable Current
Limit
l
l
l
l
l
l
l
1.35
450
113
338
225
675
20
1.5
500
0.25
125
375
0.5
250
750
1.65
550
137
412
275
825
A
mA
mA/A
µA
µA
mA/A
µA
µA
μA
Positive Current Monitor
(Note 15)
Negative Current Monitor
Minimum Required Load
Current (Note 4)
Thermal Regulation ISET
0.04
%/W
3091fa
4
For more information
www.linear.com/LT3091
LT3091
elecTrical characTerisTics
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.
Note 2.
The LT3091 is tested and specified under pulsed load conditions
such that T
J
≅
T
A
. The LT3091E is guaranteed to meet performance
specifications from 0°C to 125°C junction temperature. Specifications over
the –40°C to 125°C operating temperature range are assured by design,
characterization, and correlation with statistical process controls. The
LT3091I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3091MP is 100% tested and guaranteed
over the full –55°C to 150°C operating junction temperature range. The
LT3091H is 100% tested at the 150°C operating junction temperature.
High junction temperatures degrade operating lifetimes. Operating lifetime
is derated at junction temperatures greater than 125°C.
Note 3.
Parasitic diodes exist internally between the OUT, SET, ILIM,
SHDN,
IMONP, IMONN, and GND pins and the IN pin. Do not drive OUT,
SET, ILIM,
SHDN,
IMONP, IMONN, and GND pins more than 0.3V below
the IN pin during fault conditions. These pins must remain at a voltage
more positive than IN during normal operation.
Note 4.
The LT3091 may go out of regulation if the minimum output
current requirement is not satisfied.
Note 5.
Maximum junction temperature limits operating conditions. The
regulated output voltage specification does not apply for all possible
combinations of input voltage and output current, primarily due to the
internal current limit foldback which decreases current limit at V
OUT
–
V
IN
≥ 7V. If operating at maximum output current, limit the input voltage
range. If operating at maximum input voltage, limit the output current
range.
Note 6.
Load regulation is Kelvin sensed at the package.
Note 7.
Dropout voltage is the minimum output-to-input voltage
differential needed to maintain regulation at a specified output current. In
dropout, the output voltage is: V
IN
+ V
DROPOUT
.
Note 8.
GND pin current is tested with V
IN
= V
OUT(NOMINAL)
and a current
source load. Therefore, the device is tested while operating in dropout.
This is the worst-case GND pin current. GND pin current decreases at
higher input voltages.
Note 9.
The SET pin is clamped to OUT with diodes through 12k resistors.
These resistors and diodes only carry current under transient overloads or
fault conditions.
Note 10.
Positive
SHDN
pin current flows into the
SHDN
pin.
Note 11.
The
SHDN
threshold must be met to ensure device operation.
Note 12.
Output noise decreases by adding a capacitor across the voltage
setting resistor. Adding this capacitor bypasses the voltage setting
resistor’s thermal noise as well as the reference current’s noise. Output
noise then equals the error amplifier noise (see Applications Information
section).
Note 13.
The internal back-up current limit circuitry incorporates foldback
protection that decreases current limit for V
OUT
– V
IN
≥ 7V. Some level of
output current is provided at all V
OUT
– V
IN
differential voltages. Please
consult the Typical Performance Characteristic graph for current limit vs
V
OUT
– V
IN
.
Note 14.
The current limit programming scale factor is specified while
the internal backup current limit is not active. Please note that the internal
current limit has foldback protection for V
OUT
-to-V
IN
differentials greater
than 7V.
Note 15.
For positive current monitoring, bias IMONN to ≥ 2V above
我最近在《华尔街日报》看到一篇题为“我们需要能维修自己的电子小玩意儿的权利(We need the right to repair our gadgets)”的文章(参考原文：)，作者对于众多电子产品看来是“有计画的废弃(planned obsolescence)”之现象非常愤怒，认为大众应该要求电子产品可以被维修。 但实际的情况是，举例来说，家家都有的电视机如果故障了，修理费用可能...[详细]
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