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LT3085EDCB-TRPBF

Adjustable 500mA Single Resistor Low Dropout Regulator

厂商名称：Linear ( ADI )

厂商官网：http://www.analog.com/cn/index.html

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FEATURES
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LT3085
Adjustable 500mA Single
Resistor Low Dropout
Regulator
DESCRIPTION
The LT
®
3085 is a 500mA low dropout linear regulator that
can be paralleled to increase output current or spread
heat on surface mounted boards. Designed as a precision
current source and voltage follower, this new regulator
finds use in many applications requiring high current,
adjustability to zero, and no heat sink. The device also
brings out the collector of the pass transistor to allow
low dropout operation—down to 275mV—when used
with a second supply.
A key feature of the LT3085 is the capability to supply a
wide output voltage range. By using a reference current
through a single resistor, the output voltage is programmed
to any level between zero and 36V. The LT3085 is stable
with 2.2μF of capacitance on the output, and the IC uses
small ceramic capacitors that do not require additional
ESR as is common with other regulators.
Internal protection circuitry includes current limiting
and thermal limiting. The LT3085 is offered in the 8-lead
MSOP and a low profile (0.75mm) 6-lead 2mm
×
3mm
DFN package (both with an Exposed Pad for better thermal
characteristics).
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and VLDO
and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Outputs May be Paralleled for Higher Current and
Heat Spreading
Output Current: 500mA
Single Resistor Programs Output Voltage
1% Initial Accuracy of SET Pin Current
Output Adjustable to 0V
Current Limit Constant with Temperature
Low Output Noise: 40μV
RMS
(10Hz to 100kHz)
Wide Input Voltage Range: 1.2V to 36V
Low Dropout Voltage: 275mV
< 1mV Load Regulation
< 0.001%/ V Line Regulation
Minimum Load Current: 0.5mA
Stable with Minimum 2.2μF Ceramic Capacitor
Current Limit with Foldback and Overtemperature
Protected
8-Lead MSOP, and 6-Lead 2mm
×
3mm DFN Packages
APPLICATIONS
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High Current All Surface Mount Supply
High Efficiency Linear Regulator
Post Regulator for Switching Supplies
Low Parts Count Variable Voltage Supply
Low Output Voltage Power Supplies
TYPICAL APPLICATION
Variable Output Voltage 500mA Supply
V
IN
1.2V TO 36V
IN
V
CONTROL
LT3085
N = 1676
1μF
SET
+
–
OUT
V
OUT
2.2μF
9.80
10.00
10.20
9.90
10.10
SET PIN CURRENT DISTRIBUTION (μA)
3085 TA01b
R
SET
V
OUT
= R
SET
• 10μA
3085 TA01a
3085fb
1
LT3085
ABSOLUTE MAXIMUM RATINGS
(Note 1) All Voltages Relative to V
OUT
V
CONTROL
Pin Voltage ..................................... 40V, –0.3V
IN Pin Voltage ................................................ 40V, –0.3V
SET Pin Current (Note 7) ....................................
±15mA
SET Pin Voltage (Relative to OUT) ..........................±10V
Output Short-Circuit Duration .......................... Indefinite
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/
3085fb
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
= 2V to 36V, I
LOAD
= 1mA
ΔV
OS
ΔV
IN
= 1V to 36V,
ΔV
CONTROL
= 2V 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
reliability.
3085fb
3
LT3085
TYPICAL PERFORMANCE CHARACTERISTICS
Set Pin Current
10.20
10.15
SET PIN CURRENT (μA)
10.10
10.05
10.00
9.95
9.90
9.85
9.80
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3085 G01
Set Pin Current Distribution
2.0
N = 1676
OFFSET VOLTAGE (mV)
9.80
10.00
10.20
9.90
10.10
SET PIN CURRENT DISTRIBUTION (μA)
3085 G02
Offset Voltage (V
OUT
– V
SET
)
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3085 G03
Offset Voltage Distribution
1.00
N = 1676
OFFSET VOLTAGE (mV)
0.75
Offset Voltage
0.25
I
LOAD
= 1mA
0
Offset Voltage
T
J
= 25°C
0.25
0
–0.25
–0.50
–0.75
–1.00
–2
0
–1
1
V
OS
DISTRIBUTION (mV)
2
3085 G04
OFFSET VOLTAGE (mV)
0.50
–0.25
–0.50
T
J
= 125°C
–0.75
–1.00
–1.25
–1.50
0
6
24
30
18
INPUT-TO-OUTPUT VOLTAGE (V)
12
36
3085 G05
–1.75
0 50 100 150 200 250 300 350 400 450 500
LOAD CURRENT (mA)
3085 G06
Load Regulation
CHANGE IN OFFSET VOLTAGE WITH LOAD (mV)
0
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
–0.7
–0.8
–50 –25
CHANGE IN OFFSET VOLTAGE
0
(V
OUT
– V
SET
)
ΔI
LOAD
= 1mA TO 500mA
V
IN
– V
OUT
= 2V
CHANGE IN REFERENCE CURRENT
20
MINIMUM LOAD CURRENT (mA)
10
0
–10
–20
–30
–40
–50
CHANGE IN REFERENCE CURRENT
WITH LOAD (nA)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
Minimum Load Current
400
V
IN, CONTROL
– V
OUT
= 36V
MINIMUM IN VOLTAGE (V
IN
– V
OUT
) (mV)
350
Dropout Voltage
(Minimum IN Voltage)
T
J
= 125°C
300
250
200
T
J
= 25°C
150
100
50
0
0
50 100 150 200 250 300 350 400 450 500
LOAD CURRENT (mA)
3085 G09
V
IN, CONTROL
– V
OUT
= 1.5V
–60
25 50 75 100 125 150
TEMPERATURE (°C)
3085 G07
0
–50 –25
0
25
50
75
100 125 150
3085 G08
TEMPERATURE (°C)
3085fb
4
LT3085
TYPICAL PERFORMANCE CHARACTERISTICS
Dropout Voltage
(Minimum IN Voltage)
400
MINIMUM IN VOLTAGE (V
IN
– V
OUT
) (mV)
350
I
LOAD
= 500mA
300
250
200
150
100
50
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3085 G10
Dropout Voltage (Minimum
V
CONTROL
Pin Voltage)
1.6
1.4
MINIMUM CONTROL VOLTAGE
(V
CONTROL
– V
OUT
) (V)
1.2
1.0
T
J
= 125°C
0.8
T
J
= 25°C
0.6
0.4
0.2
0
0 50 100 150 200 250 300 350 400 450 500
LOAD CURRENT (mA)
3085 G11
Dropout Voltage (Minimum
V
CONTROL
Pin Voltage)
1.6
1.4
MINIMUM CONTROL VOLTAGE
(V
CONTROL
– V
OUT
) (V)
1.2
1.0
0.8
0.6
0.4
0.2
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3085 G12
T
J
= –50°C
I
LOAD
= 500mA
I
LOAD
= 100mA
I
LOAD
= 100mA
Current Limit
700
600
CURRENT LIMIT (mA)
CURRENT LIMIT (mA)
500
400
300
200
100
0
–50 –25
V
IN
= 7V
V
OUT
= 0V
700
600
500
400
300
Current Limit
60
OUTPUT VOLTAGE
DEVIATION (mV)
T
J
= 25°C
40
20
0
–20
–40
LOAD CURRENT
(mA)
200
100
0
200
100
0
Load Transient Response
V
OUT
= 1.5V
C
SET
= 0.1μF
V
IN
= V
CONTROL
= 3V
C
OUT
= 10μF CERAMIC
C
OUT
= 2.2μF CERAMIC
0
25 50 75 100 125 150
TEMPERATURE (°C)
3085 G13
0
5
10 15 20 25 30 35
INPUT-TO-OUTPUT DIFFERENTIAL (V)
40
0
20 40 60 80 100 120 140 160 180 200
TIME (μs)
3085 G15
3085 G14
Load Transient Response
150
OUTPUT VOLTAGE
DEVIATION (mV)
100
50
0
–50
C
OUT
= 2.2μF CERAMIC
C
OUT
= 10μF CERAMIC
OUTPUT VOLTAGE
DEVIATION (mV)
100
50
0
–50
Line Transient Response
OUTPUT VOLTAGE (V)
1.5
1
0.5
0
8
IN/CONTROL
VOLTAGE (V)
6
4
2
0
Turn-On Response
–100
6
4
2
0
0
LOAD CURRENT
(mA)
–100
500
250
0
0 10
V
IN
= V
CONTROL
= 3V
V
OUT
= 1.5V
C
SET
= 0.1μF
20 30 40 50 60 70 80 90 100
TIME (μs)
3085 G16
IN/CONTROL
VOLTAGE (V)
V
OUT
= 1.5V
I
LOAD
= 10mA
C
OUT
= 2.2μF
CERAMIC
C
SET
= 0.1μF
CERAMIC
C
OUT
= 2.2μF
CERAMIC
R
SET
= 100k
C
SET
= 0
R
LOAD
= 2Ω
10 20 30 40 50 60 70 80 90 100
TIME (μs)
3085 G17
0
2
4
6
8 10 12 14 16 18 20
TIME (μs)
3085 G18
3085fb
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