LTC6652AHMS8-3.3#TRPBF [Linear]
暂无描述;型号: | LTC6652AHMS8-3.3#TRPBF |
厂家: | Linear |
描述: | 暂无描述 光电二极管 |
文件: | 总20页 (文件大小:548K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LTC6652
Precision Low Drift Low
Noise Buffered Reference
Features
Description
The LTC®6652 family of precision, low drift, low noise
references is fully specified over the temperature range
of –40°C to 125°C. High order curvature compensation
allows these references to achieve a low drift of less than
5ppm/°Cwithapredictabletemperaturecharacteristicand
an output voltage accuracy of 0.05ꢀ. The performance
overtemperatureshouldappealtoautomotive,highperfor-
manceindustrialandotherhightemperatureapplications.
n
Low Drift:
A-Grade 5ppm/°C Max
B-Grade 10ppm/°C Max (MSOP8)
B-Grade 8ppm/°C Max (LS8)
High Accuracy:
n
A-Grade 0ꢀ05ꢁ Max
B-Grade 0ꢀ1ꢁ Max
n
n
n
n
n
n
n
n
Low Noise: 2ꢀ1ppm (0ꢀ1Hz to 10Hz)
P-P
100ꢁ Tested at –40°C, 25°C and 125°C
Sinks and Sources Current: 5mA
Low Power Shutdown: <2µA Maximum
Thermal Hysteresis (LS8): 45ppm (–40°C to 125°C)
Long-Term Drift (LS8): 20ppm/√kHr
Low Dropout: 300mV
Available Output Voltage Options: 1.25V, 2.048V, 2.5V,
3V, 3.3V, 4.096V, 5V
8-Lead MSOP and 5mm × 5mm Surface Mount
Hermetic Packages
The LTC6652 voltage references can be powered from
supply voltages up to 13.2V. They boast low noise, ex-
cellent load regulation, source and sink capability and
exceptional line rejection, making them a superior choice
for demanding precision applications. A shutdown mode
allows power consumption to be reduced when the refer-
ence is not needed. The optional output capacitor can be
left off when space constraints are critical.
n
The LTC6652 references are offered in an 8-lead MSOP
package and an 8-lead LS8 package. The LS8 is a 5mm
× 5mm surface mount hermetic package that provides
outstanding stability.
applications
n
Automotive Control and Monitoring
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
n
High Temperature Industrial
n
High Resolution Data Acquisition Systems
Instrumentation and Process Control
Precision Regulators
Medical Equipment
n
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typical application
Output Voltage Temperature Drift
0.050
Basic Connection
0.025
0
V
OUT
V
V
OUT
LTC6652-2.5
GND
2.8V ≤ V ≤ 13.2V
IN
IN
2.5V
C
OUT
C
IN
SHDN
1µF
0.1µF
(OPTIONAL)
(OPTIONAL)
6652 TA01a
–0.025
–0.050
–40 –20
0
20 40 60 80 100 125
TEMPERATURE (°C)
6652 TA01b
6652fg
1
For more information www.linear.com/LTC6652
LTC6652
absolute MaxiMuM ratings
(Note 1)
Input Voltage
Operating Temperature Range................ –40°C to 125°C
Storage Temperature Range (Note 2) ..... –65°C to 150°C
Lead Temperature Range (Soldering, 10 sec)
V to GND.......................................... –0.3V to 13.2V
IN
SHDN to GND ........................... –0.3V to (V + 0.3V)
IN
Output Voltage
(Note 9).............................................................300°C
V
.......................................... –0.3V to (V + 0.3V)
IN
OUT
Output Short-Circuit Duration...................... Indefinite
pin conFiguration
TOP VIEW
GND*
TOP VIEW
8
DNC
1
2
3
7
6
5
GND*
DNC
1
2
3
4
8 GND*
7 GND*
V
IN
V
IN
V
OUT
SHDN
6 V
OUT
GND
5 GND*
SHDN
GND*
4
MS8 PACKAGE
8-LEAD PLASTIC MSOP
GND
LS8 PACKAGE
8-PIN LEADLESS CHIP CARRIER (5mm × 5mm)
T
= 150°C, θ = 200°C/W
JA
DNC: DO NOT CONNECT
JMAX
*CONNECT THE PINS TO DEVICE GND (PIN 4)
T
= 150°C, θ = 120°C/W
JA
JMAX
DNC: DO NOT CONNECT
*CONNECT THE PINS TO DEVICE GND (PIN 4)
orDer inForMation
LEAD FREE FINISH
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
SPECIFIED TEMPERATURE RANGE
LTC6652AHMS8-1.25#PBF
LTC6652BHMS8-1.25#PBF
LTC6652AHMS8-2.048#PBF
LTC6652BHMS8-2.048#PBF
LTC6652AHMS8-2.5#PBF
LTC6652BHMS8-2.5#PBF
LTC6652AHMS8-3#PBF
LTC6652BHMS8-3#PBF
LTC6652AHMS8-3.3#PBF
LTC6652BHMS8-3.3#PBF
LTC6652AHMS8-4.096#PBF
LTC6652BHMS8-4.096#PBF
LTC6652AHMS8-5#PBF
LTC6652BHMS8-5#PBF
LTC6652AHMS8-1.25#TRPBF
LTC6652BHMS8-1.25#TRPBF
LTCVH
LTCVH
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
LTC6652AHMS8-2.048#TRPBF LTCVJ
LTC6652BHMS8-2.048#TRPBF LTCVJ
LTC6652AHMS8-2.5#TRPBF
LTC6652BHMS8-2.5#TRPBF
LTC6652AHMS8-3#TRPBF
LTC6652BHMS8-3#TRPBF
LTC6652AHMS8-3.3#TRPBF
LTC6652BHMS8-3.3#TRPBF
LTCQV
LTCQV
LTCVK
LTCVK
LTCVM
LTCVM
LTC6652AHMS8-4.096#TRPBF LTCVN
LTC6652BHMS8-4.096#TRPBF LTCVN
LTC6652AHMS8-5#TRPBF
LTC6652BHMS8-5#TRPBF
LTCVP
LTCVP
6652fg
2
For more information www.linear.com/LTC6652
LTC6652
orDer inForMation
LEAD FREE FINISH
PART MARKING*
PACKAGE DESCRIPTION
SPECIFIED TEMPERATURE RANGE
–40°C to 125°C
†
†
LTC6652AHLS8-2.5#PBF
LTC6652BHLS8-2.5#PBF
665225
8-Lead Ceramic LCC 5mm × 5mm
8-Lead Ceramic LCC 5mm × 5mm
8-Lead Ceramic LCC 5mm × 5mm
8-Lead Ceramic LCC 5mm × 5mm
8-Lead Ceramic LCC 5mm × 5mm
8-Lead Ceramic LCC 5mm × 5mm
665225
–40°C to 125°C
†
†
LTC6652AHLS8-4.096#PBF
LTC6652BHLS8-4.096#PBF
524096
–40°C to 125°C
524096
–40°C to 125°C
†
LTC6652AHLS8-5#PBF
66525
–40°C to 125°C
†
LTC6652BHLS8-5#PBF
66525
–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/
†
This product is only offered in trays. For more information go to: http://www.linear.com/packaging/
available options
OUTPUT VOLTAGE
INITIAL ACCURACY
TEMPERATURE COEFFICIENT
PART NUMBER**
1.250
0.05ꢀ
0.1ꢀ
5ppm/°C
10ppm/°C
LTC6652AHMS8-1.25
LTC6652BHMS8-1.25
2.048
2.500
0.05ꢀ
0.1ꢀ
5ppm/°C
LTC6652AHMS8-2.048
LTC6652BHMS8-2.048
10ppm/°C
0.05ꢀ
0.1ꢀ
0.05ꢀ
0.1ꢀ
5ppm/°C
10ppm/°C
5ppm/°C
8ppm/°C
LTC6652AHMS8-2.5
LTC6652BHMS8-2.5
LTC6652AHLS8-2.5
LTC6652BHLS8-2.5
3.000
3.300
4.096
0.05ꢀ
0.1ꢀ
5ppm/°C
LTC6652AHMS8-3
LTC6652BHMS8-3
10ppm/°C
0.05ꢀ
0.1ꢀ
5ppm/°C
10ppm/°C
LTC6652AHMS8-3.3
LTC6652BHMS8-3.3
0.05ꢀ
0.1ꢀ
0.05ꢀ
0.1ꢀ
5ppm/°C
10ppm/°C
5ppm/°C
8ppm/°C
LTC6652AHMS8-4.096
LTC6652BHMS8-4.096
LTC6652AHLS8-4.096
LTC6652BHLS8-4.096
5.000
0.05ꢀ
0.1ꢀ
0.05ꢀ
0.1ꢀ
5ppm/°C
10ppm/°C
5ppm/°C
8ppm/°C
LTC6652AHMS8-5
LTC6652BHMS8-5
LTC6652AHLS8-5
LTC6652BHLS8-5
**See Order Information section for complete part number listing.
electrical characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VIN = VOUT + 0ꢀ5V, unless otherwise notedꢀ
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage
LTC6652A
LTC6652B
–0.05
–0.1
0.05
0.1
ꢀ
ꢀ
l
l
l
Output Voltage Temperature Coefficient
(Note 3)
LTC6652A
LTC6652BMS8
LTC6652BLS8
2
4
4
5
10
8
ppm/°C
ppm/°C
ppm/°C
Line Regulation
V
+ 0.5V ≤ V ≤ 13.2V, SHDN = V
IN
2
50
80
ppm/V
ppm/V
OUT
IN
l
6652fg
3
For more information www.linear.com/LTC6652
LTC6652
electrical characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VIN = VOUT + 0ꢀ5V, unless otherwise notedꢀ
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Load Regulation (Note 4)
I
= 5mA, LTC6652-1.25, LTC6652-2.048,
20
75
200
ppm/mA
ppm/mA
SOURCE
l
LTC6652-2.5, LTC6652-3, LTC6652-3.3,
LTC6652-4.096, LTC6652-5
I
= 1mA, LTC6652-1.25, LTC6652-2.048
80
50
250
600
ppm/mA
ppm/mA
SINK
l
l
I
= 5mA, LTC6652-2.5, LTC6652-3,
150
450
ppm/mA
ppm/mA
SINK
LTC6652-3.3, LTC6652-4.096, LTC6652-5
I = 5mA, V Error ≤ 0.1ꢀ
SOURCE
Minimum Operating Voltage (Note 5)
OUT
l
l
LTC6652-1.25, LTC6652-2.048
LTC6652-2.5, LTC6652-3, LTC6652-3.3,
LTC6652-4.096, LTC6652-5
2.7
OUT
V
V
V
+ 0.3V
Output Short-Circuit Current
Short V
Short V
to GND
16
16
mA
mA
OUT
OUT
to V
IN
l
l
Shutdown Pin (SHDN)
Logic High Input Voltage
Logic High Input Current
2
V
µA
0.1
1
l
l
Logic Low Input Voltage
Logic Low Input Current
0.8
1
V
µA
0.1
Supply Current
No Load
350
µA
µA
l
l
560
2
Shutdown Current
SHDN Tied to GND
0.1
µA
Output Voltage Noise (Note 6)
0.1Hz ≤ f ≤ 10Hz
LTC6652-1.25
2.4
2.1
2.2
2.3
2.8
3
ppm
ppm
ppm
ppm
ppm
P-P
P-P
P-P
P-P
P-P
LTC6652-2.048, LTC6652-2.5, LTC6652-3
LTC6652-3.3
LTC6652-4.096
LTC6652-5
10Hz ≤ f ≤ 1kHz
ppm
RMS
Turn-On Time
0.1ꢀ Settling, C
= 0
100
µs
LOAD
Long-Term Drift of Output Voltage (Note 7) LTC6652MS8
LTC6652LS8
60
20
ppm/√kHr
ppm/√kHr
Hysteresis (Note 8)
∆T = –40°C to 125°C, LTC6652MS8
∆T = –40°C to 85°C, LTC6652MS8
∆T = 0°C to 70°C, LTC6652MS8
∆T = –40°C to 125°C, LTC6652LS8
∆T = –40°C to 85°C, LTC6652LS8
∆T = 0°C to 70°C, LTC6652LS8
80
75
45
45
25
10
ppm
ppm
ppm
ppm
ppm
ppm
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: If the parts are stored outside of the specified temperature range,
the output may shift due to hysteresis.
Note 7: Long-term stability typically has a logarithmic characteristic and
therefore, changes after 1000 hours tend to be much smaller than before that
time. Total drift in the second thousand hours is normally less than one third
that of the first thousand hours with a continuing trend toward reduced drift
with time. Long-term stability will also be affected by differential stresses
between the IC and the board material created during board assembly.
Note 8: Hysteresis in output voltage is created by package stress that
differs depending on whether the IC was previously at a higher or lower
temperature. Output voltage is always measured at 25°C, but the IC is
cycled to the hot or cold temperature limit before successive measurements.
Hysteresis is roughly proportional to the square of the temperature change.
For instruments that are stored at well controlled temperatures (within 20
or 30 degrees of operational temperature) it’s usually not a dominant error
source.Typical hysteresis is the worst-case of 25°C to cold to 25°C or 25°C
to hot to 25°C, preconditioned by one thermal cycle.
Note 3: Temperature coefficient is measured by dividing the maximum
change in output voltage by the specified temperature range.
Note 4: Load regulation is measured on a pulse basis from no load to the
specified load current. Output changes due to die temperature change
must be taken into account separately.
Note 5: Excludes load regulation errors.
Note 6: Peak-to-peak noise is measured with a 3-pole highpass at 0.1Hz
and 4-pole lowpass filter at 10Hz. The unit is enclosed in a still-air
environment to eliminate thermocouple effects on the leads. The test
time is 10 seconds. RMS noise is measured on a spectrum analyzer in
a shielded environment where the intrinsic noise of the instrument is
removed to determine the actual noise of the device.
Note 9: The stated temperature is typical for soldering of the leads during
manual rework. For detailed IR reflow recommendations, refer to the
Applications section.
6652fg
4
For more information www.linear.com/LTC6652
LTC6652
typical perForMance characteristics
Characteristic curves are similar for most
LTC6652sꢀ Curves from the LTC6652-1ꢀ25, LTC6652-2ꢀ5 and the LTC6652-5 represent the extremes and typical of the voltage optionsꢀ
Characteristic curves for other output voltages fall between these curves and can be estimated based on their outputꢀ
1ꢀ25V Output Voltage
Temperature Drift
1ꢀ25V Line Regulation
1ꢀ25V Load Regulation (Sourcing)
1.2506
1.2504
1.2502
1.2500
0
–50
1.2510
1.2505
1.2500
1.2495
1.2490
3 TYPICAL PARTS
–40°C
125°C
25°C
–100
–150
–200
–250
125°C
25°C
1.2498
1.2496
1.2494
–40°C
10
8
12
14
0
2
4
6
80
TEMPERATURE (°C)
1
10
–80
–40
0
40
120
160
0.1
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
6652 G18
6652 G17
6652 G19
1ꢀ25V Low Frequency 0ꢀ1Hz to
10Hz Transient Noise
1ꢀ25V Output Voltage Noise
Spectrum
1ꢀ25V Load Regulation (Sinking)
400
350
300
250
200
150
100
50
400
300
200
100
0
125°C
25°C
–40°C
0
0.1
1
10
TIME (1 SECOND/DIV)
0.01
0.1
1
10
OUTPUT CURRENT (mA)
FREQUENCY (kHz)
6652 G22
6652 G20
6652 G21
1ꢀ25V Stability with Output
Capacitance
1ꢀ25 Sinking Current Without
Output Capacitor
1ꢀ25 Sinking Current with Output
Capacitor
10µF
1µF
1mA
0mA
1mA
0mA
I
I
OUT
OUT
0.1µF
10nF
V
V
REGION OF
MARGINAL
STABILITY
OUT
OUT
500mV/DIV
500mV/DIV
1nF
100pF
6652 G23
6652 G24
500µs/DIV
500µs/DIV
C
= 0µF
C
= 1µF
OUT
OUT
NO CAP
–5
–1
0
5
LOAD CURRENT (mA)
6652 G16
6652fg
5
For more information www.linear.com/LTC6652
LTC6652
typical perForMance characteristics
Characteristic curves are similar for most
LTC6652sꢀ Curves from the LTC6652-1ꢀ25, LTC6652-2ꢀ5 and the LTC6652-5 represent the extremes and typical of the voltage optionsꢀ
Characteristic curves for other output voltages fall between these curves and can be estimated based on their outputꢀ
2ꢀ5V Output Voltage
Temperature Drift
2ꢀ5V Line Regulation
2ꢀ5V Load Regulation (Sourcing)
0
–20
2.5010
2.5005
2.5000
2.4995
2.5010
2.5005
2.5000
2.4995
2.4990
2.4985
3 TYPICAL PARTS
–40°C
–40
–60
125°C
25°C
25°C
–80
125°C
–100
–120
–140
–160
–180
–200
–40°C
2.4990
2.4985
2.4980
0.1
1
10
8
12
14
50
0
2
4
6
10
–50 –25
0
25
75 100 125 150
OUTPUT CURRENT (mA)
INPUT VOLTAGE (V)
TEMPERATURE (°C)
6652 G03
6652 G02
6652 G01
2ꢀ5V Supply Current
vs Input Voltage
2ꢀ5V Shutdown Current
vs Input Voltage
2ꢀ5V Load Regulation (Sinking)
1000
900
800
700
600
500
400
300
200
100
0
700
600
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
500
400
125°C
25°C
125°C
125°C
25°C
200
100
0
–40°C
25°C
–40°C
–40°C
0
4
6
8
10
12
14
0.1
1
10
2
0
4
6
8
10
12
14
2
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
INPUT VOLTAGE (V)
6652 G05
6652 G04
6652 G06
2ꢀ5V Minimum VIN-VOUT
Differential (Sourcing)
2ꢀ5V Minimum VOUT-VIN
Differential (Sinking)
10
10
1
1
25°C
0.1
0.01
25°C
125°C, –40°C
125°C
–40°C
0.1
0.001
0.01
0.1
1
0.001
0.01
0.1
1
OUTPUT-INPUT VOLTAGE (V)
INPUT-OUTPUT VOLTAGE (V)
6652 G10
6652 G09
6652fg
6
For more information www.linear.com/LTC6652
LTC6652
typical perForMance characteristics
Characteristic curves are similar for most
LTC6652sꢀ Curves from the LTC6652-1ꢀ25, LTC6652-2ꢀ5 and the LTC6652-5 represent the extremes and typical of the voltage optionsꢀ
Characteristic curves for other output voltages fall between these curves and can be estimated based on their outputꢀ
2ꢀ5V Low Frequency 0ꢀ1Hz to
10Hz Transient Noise
2ꢀ5V Output Voltage Noise
Spectrum
600
500
400
300
200
100
0
TIME (1 SECOND/DIV)
0.01
0.1
1
10
FREQUENCY (kHz)
6652 G12
6652 G11
Stability with Output Capacitance
(LTC6652-2ꢀ5, LTC6652-3,
LTC6652-3ꢀ3, LTC6652-4ꢀ096,
LTC6652-5)
Typical VOUT Distribution for
LTC6652-2ꢀ5
180
160
140
120
80
10µF
1µF
1004 UNITS
LTC6652A LIMITS
0.1µF
10nF
REGION OF
MARGINAL STABILITY
60
1nF
100pF
40
20
0
NO CAP
2.4985
2.4995
2.5005
2.5015
–5
0
5
OUTPUT VOLTAGE (V)
LOAD CURRENT (mA)
6652 G15
6652 G14
6652fg
7
For more information www.linear.com/LTC6652
LTC6652
typical perForMance characteristics
Characteristic curves are similar for most
LTC6652sꢀ Curves from the LTC6652-1ꢀ25, LTC6652-2ꢀ5 and the LTC6652-5 represent the extremes and typical of the voltage optionsꢀ
Characteristic curves for other output voltages fall between these curves and can be estimated based on their outputꢀ
5V Output Voltage
Temperature Drift
5V Supply Current
vs Input Voltage
5V Line Regulation
5.005
5.003
5.000
4.998
4.995
1000
900
800
700
600
500
400
300
200
100
0
5.002
5.001
5.000
4.999
4.998
3 TYPICAL PARTS
25°C
125°C
–40°C
125°C
25°C
–40°C
50
–50 –25
0
25
75 100 125 150
0
4
6
8
10
12
14
8
12
14
2
0
2
4
6
10
TEMPERATURE (°C)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
6652 G25
6652 G27
6652 G26
5V Shutdown Current
vs Input Voltage
5V Minimum VIN to VOUT
Differential (Sourcing)
5V Low Frequency 0ꢀ1Hz to 10Hz
Transient Noise
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
10
1
125°C
25°C
0.1
0.01
–40°C
–40°C
125°C
25°C
10
12
INPUT VOLTAGE (V)
0
4
6
8
14
0.001
0.01
0.1
1
TIME (1 SECOND/DIV)
2
INPUT-OUTPUT VOLTAGE (V)
6652 G31
6652 G29
6652 G30
5V Start-Up Response Without
Output Capacitor
5V Start-Up Response with Output
Capacitor
5V Output Voltage Noise Spectrum
1000
800
600
400
200
0
V
V
IN
IN
2V/DIV
2V/DIV
V
V
OUT
2V/DIV
OUT
2V/DIV
6652 G33
6652 G34
100µs/DIV
100µs/DIV
C
= 0µF
C
OUT
= 1µF
OUT
0.01
0.1
1
10
FREQUENCY (kHz)
6652 G32
6652fg
8
For more information www.linear.com/LTC6652
LTC6652
typical perForMance characteristics
Characteristic curves are similar for most
LTC6652sꢀ Curves from the LTC6652-1ꢀ25, LTC6652-2ꢀ5 and the LTC6652-5 represent the extremes and typical of the voltage optionsꢀ
Characteristic curves for other output voltages fall between these curves and can be estimated based on their outputꢀ
Power Supply Rejection Ratio
vs Frequency
SHDN Input Voltage Thresholds
Output Impedance vs Frequency
vs VIN
100
0
–10
–20
–30
2.5
2.0
1.5
1.0
0.5
0
C
= 0µF
OUT
C
= 0µF
OUT
V
TH(UP)
10
1
C
= 1µF
OUT
–40
–50
V
TH(DN)
C
= 1µF
OUT
C
= 10µF
–60
–70
OUT
C
= 10µF
OUT
–80
–90
0.1
–100
8
12
14
0.01
0.1
1
10
100
1000
0.01
0.1
1
10
100
2
4
6
10
FREQUENCY (kHz)
FREQUENCY (kHz)
V
(V)
IN
6652 G13
6652 G08
6652 G07
pin Functions
DNC (Pin 1): Do Not Connect.
GND (Pin 4): Device Ground.
(Pin 6): Output Voltage. An output capacitor is not
required.Forsomeapplications,acapacitorbetween0.1µF
to 10µF can be beneficial. See the graphs in the Typical
Performance Characteristics section for further details.
V (Pin 2): Power Supply. The minimum supply input is
V
IN
OUT
OUT
V
+300mVor2.7V;whicheverishigher.Themaximum
supply is 13.2V. Bypassing V with a 0.1µF capacitor to
GND will improve PSRR.
IN
SHDN (Pin 3): Shutdown Input. This active low input
GND (Pins 5,7,8): Internal Function. Ground these pins.
powers down the device to <2µA. For normal operation
tie this pin to V .
IN
6652fg
9
For more information www.linear.com/LTC6652
LTC6652
block DiagraM
V
IN
2
+
–
V
OUT
SHDN
BANDGAP
3
6
GND
4
6652 BD
applications inForMation
Bypass and Load Capacitors
The transient response for a 0.5V step on V with and
IN
without an output capacitor is shown in Figures 2 and 3,
The LTC6652 voltage references do not require an input
capacitor, but a 0.1µF capacitor located close to the part
improves power supply rejection.
respectively.
The LTC6652 references with an output of 2.5V and above
are guaranteed to source and sink 5mA. The 1.25V and
2.048V versions are guaranteed to source 5mA and sink
1mA. The test circuit for transient load step response is
shown in Figure 1. Figures 4 and 5 show a 5mA source
and sink load step response without a load capacitor,
respectively.
TheLTC6652voltagereferencesarestablewithorwithout
acapacitiveload. Forapplicationswhereanoutputcapaci-
tor is beneficial, a value of 0.1µF to 10µF is recommended
depending on load conditions. The Typical Performance
Characteristics section includes a plot illustrating a region
of marginal stability. Either no or low value capacitors for
anyloadcurrentareacceptable. Forloadsthatsinkcurrent
orlightloadsthatsourcecurrent,a0.1µFto10µFcapacitor
has stable operation. For heavier loads that source current
a 0.5µF to 10µF capacitor range is recommended.
Start-Up
The start-up characteristic of the LTC6652 is shown in
Figures 8 and 9. Note that the turn-on time is affected by
the value of the output capacitor.
100Ω
2, 3
6
V
IN
LTC6652-2.5
3V
C
IN
C
OUT
1µF
0.5V
V
GEN
0.1µF
4, 5, 7, 8
6652 F01
Figure 1ꢀ Transient Load Test Circuit
6652fg
10
For more information www.linear.com/LTC6652
LTC6652
applications inForMation
3.5V
5mA
0mA
V
IN
I
OUT
3V
V
OUT
500mV/DIV
V
OUT
200mV/DIV
6652 F05
6652 F02
C
= 0µF
250µs/DIV
C
= 0µF
500µs/DIV
OUT
OUT
Figure 2ꢀ Transient Response Without
Output Capacitor
Figure 5ꢀ LTC6652-2ꢀ5 Sinking Current
Without Output Capacitor
0mA
3.5V
I
OUT
V
IN
–5mA
3V
V
OUT
500mV/DIV
V
OUT
200mV/DIV
6652 F03
6652 F06
C
= 1µF
500µs/DIV
C
= 1µF
250µs/DIV
OUT
OUT
Figure 3ꢀ Transient Response with 1µF
Output Capacitor
Figure 6ꢀ LTC6652-2ꢀ5 Sourcing Current
with Output Capacitor
5mA
0mA
I
I
OUT
OUT
0mA
–5mA
V
OUT
V
OUT
50mV/DIV
200mV/DIV
6652 F07
6652 F04
C
= 1µF
250µs/DIV
C
= 0µF
250µs/DIV
OUT
OUT
Figure 4ꢀ LTC6652-2ꢀ5 Sourcing
Current Without Output Capacitor
Figure 7ꢀ LTC6652-2ꢀ5 Sinking Current
with Output Capacitor
6652fg
11
For more information www.linear.com/LTC6652
LTC6652
applications inForMation
2.8V ≤ V ≤ 13.2V
IN
V
IN
C1
1µF
R1
20k
2V/DIV
V
IN
LTC6652-2.5
SHDN
V
V
OUT
OUT
V
OUT
GND
1V/DIV
TO µC
6652 F10
C2
1µF
2N7002
6652 F08
C
= 0µF
100µs/DIV
OUT
Figure 8ꢀ Start-Up Response without
Output Capacitor
Figure 10ꢀ Open-Drain Shutdown Circuit
V
IN
2V/DIV
SHDN
1V/DIV
V
OUT
V
OUT
1V/DIV
1V/DIV
6652 F09
6652 F11
C
= 1µF
100µs/DIV
I
= 5mA
1ms/DIV
OUT
LOAD
Figure 9ꢀ Start-Up Response with 1µF
Output Capacitor
Figure 11ꢀ Shutdown Response with
5mA Load
In Figure 8, ripple momentarily appears just after the
leading edge of powering on. This brief one time event is
caused by calibration circuitry during initialization. When
anoutputcapacitorisused, therippleisvirtuallyundetect-
able as shown in Figure 9.
an output impedance of 20k • 2.5 = 50kΩ. For normal
operation, SHDN should be greater than or equal to 2.0V.
For use with a microcontroller, use a pull-up resistor to
V
and an open-drain output driver as shown in Figure
IN
10. The LTC6652’s response into and out of shutdown
mode is shown in Figure 11.
Shutdown Mode
ThetripthresholdsonSHDNhavesomedependenceonthe
Shutdown mode is enabled by tying SHDN low which
places the part in a low power state (i.e., <2µA). In shut-
down mode, the output pin takes the value 20k • (rated
output voltage). For example, an LTC6652-2.5 will have
voltageappliedtoV asshownintheTypicalPerformance
IN
Characteristics section. Be careful to avoid leaving SHDN
ata voltage between the thresholds asthis willlikely cause
anincreaseinsupplycurrentduetoshoot-throughcurrent.
6652fg
12
For more information www.linear.com/LTC6652
LTC6652
applications inForMation
80
80
60
LTC6652-2.5 MS8 PACKAGE
LTC6652-2.5 LS8 PACKAGE
4 TYPICAL PARTS
A
3 TYPICAL PARTS
T
= 35°C
T
= 30°C
60
40
A
40
20
20
0
0
–20
–40
–20
–40
0
300
600
900
1200
1500
0
200
400
600
800
1000
HOURS
HOURS
6652 F12a
6652 F12b
Figure 12aꢀ MS8 Long-Term Drift
Figure 12bꢀ LS8 Long-Term Drift
35
30
25
20
15
10
5
9
8
7
6
5
4
3
2
1
0
25°C TO 125°C TO 25°C 25°C TO –40°C TO 25°C
25°C TO 125°C TO 25°C 25°C TO –40°C TO 2
5°C
0
–250
–150
–50
50
150
–110 –80 –50 –20
0 20 50 80 110
DISTRIBUTION (ppm)
DISTRIBUTION (ppm)
6652 F13a
6652 F13b
Figure 13aꢀ MS8 Hysteresis Plot
–40°C to 125°C
Figure 13bꢀ LS8 Hysteresis Plot
–40°C to 125°C
Long-Term Drift
Hysteresis
Long-termdriftcannotbeextrapolatedfromaccelerated
hightemperaturetestingꢀThiserroneoustechniquegives
drift numbers that are wildly optimisticꢀ The only way
long-term drift can be determined is to measure it over
thetimeintervalofinterestꢀTheLTC6652long-termdrift
data was collected on more than 100 parts that were sol-
dered into PC boards similar to a “real world” application.
The boards were then placed into a constant temperature
The hysteresis data shown in Figure 13 represents the
worst-case data collected on parts from –40°C to 125°C.
The output is capable of dissipating relatively high power,
i.e., for the LTC6652-2.5, P = 10.7V • 5.5mA = 58.85mW.
D
The thermal resistance of the MS8 package is 200°C/W
and this dissipation causes a 11.8°C internal rise. This
could increase the junction temperature above 125°C and
may cause the output to shift due to thermal hysteresis.
oven with T = 35°C, their outputs were scanned regularly
A
and measured with an 8.5 digit DVM. Long-term drift is
shown below in Figure 12.
6652fg
13
For more information www.linear.com/LTC6652
LTC6652
applications inForMation
PC Board Layout
expectedusingaconvectionreflowoven.Inourexperiment,
the serialized parts were run through the reflow process
twice. The results indicate that the standard deviation of
the output voltage increases with a slight positive mean
shift of 0.003ꢀ as shown in Figure 15. While there can
be up to 0.016ꢀ of output voltage shift, the overall drift
of the LTC6652 after IR reflow does not vary significantly.
The mechanical stress of soldering a surface mount volt-
age reference to a PC board can cause the output voltage
to shift and temperature coefficient to change. These two
changes are not correlated. For example, the voltage may
shift, but the temperature coefficient may not.
To reduce the effects of stress-related shifts, mount the
reference near the short edge of the PC board or in a
corner. In addition, slots can be cut into the board on two
sides of the device.
Power Dissipation
Power dissipation in the LTC6652 is dependent on V ,
IN
load current, and package. The LTC6652 package has
The capacitors should be mounted close to the package.
a thermal resistance, or θ , of 200°C/W. A curve that
JA
The GND and V
traces should be as short as possible
illustrates allowed power dissipation vs temperature for
OUT
to minimize I • R drops. Excessive trace resistance directly
this package is shown in Figure 16.
impacts load regulation.
The power dissipation of the LTC6652-2.5V as a function
of input voltage is shown in Figure 17. The top curve
showspowerdissipationwitha5mAloadandthebottom
curve shows power dissipation with no load.
IR Reflow Shift
Thedifferentexpansionandcontractionratesofthemateri-
als that make up the lead-free LTC6652 package cause the
outputvoltagetoshiftafterundergoingIRreflow.Lead-free
reflow profiles reach over 250°C, considerably more than
their leaded counterparts. The lead-free IR reflow profile
used to experimentally measure output voltage shift in the
LTC6652-2.5 is shown in Figure 14. Similar results can be
When operated within its specified limits of V = 13.2V
IN
andsourcing5mA,theLTC6652-2.5consumesjustunder
60mW at room temperature. At 125°C the quiescent cur-
rent will be slightly higher and the power consumption
increases to just over 60mW. The power-derating curve
in Figure 16 shows the LTC6652-2.5 can safely dissipate
125mW at 125°C about half the maximum power con-
sumption of the package.
300
380s
T
= 260°C
P
RAMP
DOWN
T
= 217°C
L
225
150
75
Humidity Sensitivity
T
= 200°C
S(MAX)
t
T
= 190°C
P
S
30s
Plastic mould compounds absorb water. With changes
in relative humidity, plastic packaging materials change
the amount of pressure they apply to the die inside,
which can cause slight changes in the output of a volt-
age reference, usually on the order of 100ppm. The LS8
packageishermetic, soitisnotaffectedbyhumidity, and
is therefore more stable in environments where humidity
may be a concern.
T = 150°C
t
L
RAMP TO
150°C
130s
40s
120s
4
0
0
2
6
8
10
MINUTES
6652 F14
Figure 14ꢀ Lead-Free Reflow Profile
6652fg
14
For more information www.linear.com/LTC6652
LTC6652
applications inForMation
10
8
7
6
5
4
3
2
1
0
1X
3X
6
4
2
0
–0.014 –0.006
0.002
0.010
0.018
–0.1
–0.06 –0.02 0 0.02
0.06
0.1
OUTPUT VOLTAGE SHIFT DUE TO IR REFLOW (%)
OUTPUT VOLTAGE SHIFT DUE TO IR REFLOW (%)
6652 F15a
6652 F15b
Figure 15aꢀ MS8 Output Voltage
Shift Due to IR Reflow
Figure 15bꢀ LS8 Output Voltage
Shift Due to IR Reflow
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.06
T
= 25°C
A
0.05
0.04
0.03
0.02
0.01
0
5mA LOAD
NO LOAD
0
20
40
60
140
2
4
6
8
14
80 100 120
10
12
TEMPERATURE (°C)
V
(V)
IN
6652 F16
6652 F17
Figure 16ꢀ Maximum Recommended
Dissipation for LTC6652
Figure 17ꢀ Typical Power Dissipation
of the LTC6652
6652fg
15
For more information www.linear.com/LTC6652
LTC6652
typical applications
Extended Supply Range Reference
Extended Supply Range Reference
6V TO 160V
4V TO 30V
R1
R1
330k
R2
4.7k
ON SEMI
MMBT5551
V
V
OUT
LTC6652-2.5
GND
V
OUT
IN
V
SHDN
IN
SHDN
C1
0.1µF
BZX84C18
C2
OPTIONAL
6652 TA02
V
V
LTC6652-2.5
GND
OUT
OUT
BZX84C18
C2
OPTIONAL
C1
0.1µF
6652 TA03
Negative Rail Circuit
Boosted Output Current
V
≥ 1.75V
2, 3
+
CC
V
≥ (V
+ 1.8V)
OUT
R1
220Ω
C1
1µF
C1
0.1µF
2N2905
V
SHDN
IN
6
LTC6652-2.5
V
OUT
V
OUT
LTC6652-2.5
GND
C2
1µF
4, 5, 7, 8
500Ω
≤ –3V
V
OUT
6652 TA04
–2.5V
1µF
6652 TA06
V
EE
6652fg
16
For more information www.linear.com/LTC6652
LTC6652
package Description
Please refer to http://wwwꢀlinearꢀcom/product/LTC6652#packaging for the most recent package drawingsꢀ
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660 Rev G)
0.889 0.127
(.035 .005)
5.10
3.20 – 3.45
(.201)
(.12ꢀ – .13ꢀ)
MIN
3.00 0.102
(.118 .004)
(NOTE 3)
0.52
(.0205)
REF
0.ꢀ5
(.025ꢀ)
BSC
0.42 0.038
(.01ꢀ5 .0015)
TYP
8
7 ꢀ 5
RECOMMENDED SOLDER PAD LAYOUT
3.00 0.102
(.118 .004)
(NOTE 4)
4.90 0.152
(.193 .00ꢀ)
DETAIL “A”
0.254
(.010)
0° – ꢀ° TYP
GAUGE PLANE
1
2
3
4
0.53 0.152
(.021 .00ꢀ)
1.10
(.043)
MAX
0.8ꢀ
(.034)
REF
DETAIL “A”
0.18
(.007)
SEATING
PLANE
0.22 – 0.38
0.101ꢀ 0.0508
(.009 – .015)
(.004 .002)
0.ꢀ5
(.025ꢀ)
BSC
TYP
MSOP (MS8) 0213 REV G
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.00ꢀ") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.00ꢀ") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
6652fg
17
For more information www.linear.com/LTC6652
LTC6652
package Description
Please refer to http://wwwꢀlinearꢀcom/product/LTC6652#packaging for the most recent package drawingsꢀ
LS8 Package
8-Pin Leadless Chip Carrier (5mm × 5mm)
(Reference LTC DWG # 05-08-1852 Rev B)
8
2.50 0.15
PACKAGE OUTLINE
7
1
0.5
2
3
6
2.54 0.15
1.4
1.50 0.15
XYY ZZ
ABCDEF
4
Q12345
0.70 0.05 × 8
COMPONENT
PIN “A1”
5.00 SQ 0.15
5.80 SQ 0.15
TRAY PIN 1
BEVEL
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
PACKAGE IN TRAY LOADING ORIENTATION
5.00 SQ 0.15
4.20 SQ 0.10
8
1.45 0.10
0.95 0.10
5.00 SQ 0.15
8
R0.20 REF
2.00 REF
PIN 1
1
2
1
2
7
6
7
6
TOP MARK
(SEE NOTE 5)
0.5
2.54 0.15
4.20 0.10
1.4
5
3
3
5
R0.20 REF
1.00 × 7 TYP
LS8 0113 REV B
4
4
0.70 TYP
0.10 TYP
0.64 × 8 TYP
NOTE:
1. ALL DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS PACKAGE DO NOT INCLUDE PLATING BURRS
PLATING BURRS, IF PRESENT, SHALL NOT EXCEED 0.30mm ON ANY SIDE
4. PLATING—ELECTO NICKEL MIN 1.25UM, ELECTRO GOLD MIN 0.30UM
5. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
6652fg
18
For more information www.linear.com/LTC6652
LTC6652
revision history (Revision history begins at Rev C)
REV
DATE
DESCRIPTION
PAGE NUMBER
C
11/09 Change to Typical Performance Characteristics.
Change to Typical Application.
6
14
D
8/12
Addition of 5mm × 5mm Hermetic LS8 Package.
Update to Electrical Characteristics to Include LS8 Package.
Addition of Long Term Drift, Hysteresis, IR Drift Plots for LS8 Package.
Addition of Humidity Sensitivity Information.
1, 2, 3, 12, 18
4
13, 15
14
E
F
1/13
7/15
Correction to pin labeling of LS8 Package
2
Order Information updated to include 4.096V and 5V options in LS8 package.
MS8 and LS8 package descriptions updated.
3
17, 18
3
G
10/15 Correction to the Electrical Characteristics Table: Output Voltage Temperature Coefficient for LTC6652BMS8
specification applies over the full operating temperature range.
6652fg
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnectionof itscircuits asdescribedhereinwill notinfringeon existing patent rights.
19
LTC6652
typical application
Improved Reference Supply Rejection in a Data Converter Application
LTC1657
16
D/A
REF
DATA
VDAC
V
CC
GND
V
IN
R1
50k
V
OUT
LTC6652
REF
A/D
LTC1605
SHDN
V1
16
C1
0.1µF
V2
V3
V4
D
OUT
C2
C
OUT
10µF
1µF
GND
GND
6652 TA05
relateD parts
PART NUMBER DESCRIPTION
COMMENTS
LT1460
LT1461
LT1790
LT6650
LT6660
LT6654
Micropower Series References
Micropower Series Low Dropout
Micropower Precision Series References
0.075% Max, 10ppm/°C Max, 20mA Output Current
0.04% Max, 3ppm/°C Max, 50mA Output Current
0.05% Max, 10ppm/°C Max, 60µA Supply, SOT23 Package
0.5% Max, 5.6µA Supply, SOT23 Package
Micropower Reference with Buffer Amplifier
Tiny Micropower Series Reference
0.2% Max, 20ppm/°C Max, 20mA Output Current, 2mm × 2mm DFN
Precision Wide Supply High Output Drive Low Noise Reference 0.05% Max, 10ppm/°C Max, 10mA Output Current,
1.6ppm Noise, SOT23 and LS8 Packages, –55°C to 125°C
P-P
LTC6655
Precision, Low Drift, Low Noise Reference
0.025% Max, 2ppm/°C Max, 5mA Output Current,
0.25ppm Noise, –40°C to 125°C
P-P
6652fg
LT 1015 REV G • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
20
●
●
(408)432-1900 FAX: (408) 434-0507 www.linear.com/LTC6652
LINEAR TECHNOLOGY CORPORATION 2007
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