Operating Junction Temperature Range (Notes 2, 10)
E, I Grade ........................................... –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)
MS8E Package Only .......................................... 300°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
OUT 1
OUT 2
SET 3
7
6 IN
5 IN
4 V
CONTROL
OUT
OUT
OUT
SET
1
2
3
4
8
7
6
5
IN
IN
NC
V
CONTROL
9
DCB PACKAGE
6-LEAD (2mm 3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 73°C/W,
θ
JC
= 10.6°C/W
EXPOSED PAD (PIN 7) IS OUT, MUST BE SOLDERED TO V
OUT
ON PCB
SEE THE APPLICATIONS INFORMATION SECTION
MS8E PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 60°C/W,
θ
JC
= 10°C/W
EXPOSED PAD (PIN 9) IS OUT, MUST BE SOLDERED TO V
OUT
ON PCB
SEE THE APPLICATIONS INFORMATION SECTION
ORDER INFORMATION
LEAD FREE FINISH
LT3085EDCB#PBF
LT3085EMS8E#PBF
LT3085IDCB#PBF
LT3085IMS8E#PBF
LT3085MPMS8E#PBF
LEAD BASED FINISH
LT3085EDCB
LT3085EMS8E
LT3085IDCB
LT3085IMS8E
LT3085MPMS8E
TAPE AND REEL
LT3085EDCB#TRPBF
LT3085EMS8E#TRPBF
LT3085IDCB#TRPBF
LT3085IMS8E#TRPBF
LT3085MPMS8E#TRPBF
TAPE AND REEL
LT3085EDCB#TR
LT3085EMS8E#TR
LT3085IDCB#TR
LT3085IMS8E#TR
LT3085MPMS8E#TR
PART MARKING*
LDQQ
LTDQP
LDQQ
LTDQP
LTDWQ
PART MARKING*
LDQQ
LTDQP
LDQQ
LTDQP
LTDWQ
PACKAGE DESCRIPTION
6-Lead (2mm
×
3mm) Plastic DFN
8-Lead Plastic MSOP
6-Lead (2mm
×
3mm) Plastic DFN
8-Lead Plastic MSOP
8-Lead Plastic MSOP
PACKAGE DESCRIPTION
6-Lead (2mm
×
3mm) Plastic DFN
8-Lead Plastic MSOP
6-Lead (2mm
×
3mm) Plastic DFN
8-Lead Plastic MSOP
8-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°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/
3085fa
2
LT3085
ELECTRICAL CHARACTERISTICS
PARAMETER
SET Pin Current
Output Offset Voltage (V
OUT
– V
SET
)
Load Regulation
Line Regulation
Minimum Load Current (Notes 3, 9)
V
CONTROL
Dropout Voltage (Note 4)
V
IN
Dropout Voltage (Note 4)
V
CONTROL
Pin Current (Note 5)
Current Limit (Note 9)
Error Amplifier RMS Output Noise (Note 6)
Ripple Rejection
CONDITIONS
I
SET
V
IN
= 1V, V
CONTROL
= 2V, I
LOAD
= 1mA, T
J
= 25°C
V
IN
≥ 1V, V
CONTROL
≥ 2V, 1mA ≥ I
LOAD
≥ 500mA (Note 9)
V
OS
V
IN
= 1V, V
CONTROL
= 2V, I
LOAD
= 1mA, T
J
= 25°C
V
IN
= 1V, V
CONTROL
= 2V, I
LOAD
= 1mA
ΔI
SET
ΔI
LOAD
= 1mA to 500mA
ΔV
OS
ΔI
LOAD
= 1mA to 500mA (Note 8)
ΔI
SET
ΔV
IN
= 1V to 36V,
ΔV
CONTROL
= 1V to 36V, I
LOAD
= 1mA
ΔV
OS
ΔV
IN
= 1V to 36V,
ΔV
CONTROL
= 1V to 36V, I
LOAD
= 1mA
V
IN
= V
CONTROL
= 10V
V
IN
= V
CONTROL
= 36V
I
LOAD
= 100mA
I
LOAD
= 500mA
I
LOAD
= 100mA
I
LOAD
= 500mA
I
LOAD
= 100mA
I
LOAD
= 500mA
V
IN
= 5V, V
CONTROL
= 5V, V
SET
= 0V, V
OUT
= -0.1V
,
I
LOAD
= 500mA, 10Hz≤f≤100kHz, C
OUT
=10μF C
SET
=0.1μF
f=120Hz, V
RIPPLE
=0.5V
P-P
, I
LOAD
=0.1A, C
SET
=0.1μF, C
OUT
=2.2μF
f=10kHz
f=1MHz
10ms Pulse
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
9.9
9.8
–1.5
–3
–0.1
–0.6
0.1
0.003
300
1.2
1.35
85
275
3
8
500
650
33
0.7
90
75
20
0.003
TYP
10
10
MAX
10.1
10.2
1.5
3
–1
0.5
500
1
1.6
150
450
6
15
UNITS
μA
μA
mV
mV
nA
mV
nA/V
mV/V
μA
mA
V
V
mV
mV
mA
mA
mA
μV
RMS
nA
RMS
dB
dB
dB
%/W
Reference Current RMS Output Noise (Note 6) 10Hz≤f≤100kHz
Thermal Regulation, I
SET
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.
Unless otherwise specified, all voltages are with respect to V
OUT
.
The LT3085 is tested and specified under pulse load conditions such that
T
J
≅
T
A
. The LT3085E is 100% tested at T
A
= 25°C. Performance of the
LT3085E over the full –40°C to 125°C operating junction temperature
range is assured by design, characterization, and correlation with
statistical process controls. The LT3085I regulators are guaranteed
over the full –40°C to 125°C operating junction temperature range. The
LT3085 (MP grade) is 100% tested and guaranteed over the –55°C to
125°C operating junction temperature range.
Note 3.
Minimum load current is equivalent to the quiescent current of
the part. Since all quiescent and drive current is delivered to the output
of the part, the minimum load current is the minimum current required to
maintain regulation.
Note 4.
For the LT3085, dropout is caused by either minimum control
voltage (V
CONTROL
) or minimum input voltage (V
IN
). Both parameters are
specified with respect to the output voltage. The specifications represent
the minimum input-to-output differential voltage required to maintain
regulation.
Note 5.
The V
CONTROL
pin current is the drive current required for the
output transistor. This current will track output current with roughly a 1:60
ratio. The minimum value is equal to the quiescent current of the device.
Note 6.
Output noise is lowered by adding a small capacitor across the
voltage setting resistor. Adding this capacitor bypasses the voltage setting
resistor shot noise and reference current noise; output noise is then equal
to error amplifier noise (see Applications Information section).
Note 7.
The SET pin is clamped to the output with diodes through 1k
resistors. These resistors and diodes will only carry current under
transient overloads.
Note 8.
Load regulation is Kelvin sensed at the package.
Note 9.
Current limit includes foldback protection circuitry. Current limit
decreases at higher input-to-output differential voltages. See the Typical
Performance Characteristics graphs for more information.
Note 10.
This IC includes over-temperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
when over-temperature protection is active. Continuous operation above
the specified maximum operating junction temperature may impair device
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