LT1460DCN8-10-TRPBF [Linear]
Micropower Precision Series Reference Family; 微功率精准串联基准系列型号: | LT1460DCN8-10-TRPBF |
厂家: | Linear |
描述: | Micropower Precision Series Reference Family |
文件: | 总26页 (文件大小:1111K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LT1460
Micropower Precision
Series Reference Family
Features
Description
The LT®1460 is a micropower bandgap reference that
combines very high accuracy and low drift with low power
dissipation and small package size. This series reference
uses curvature compensation to obtain low temperature
coefficient and trimmed precision thin-film resistors to
achieve high output accuracy. The reference will supply
up to 20mA with excellent line regulation characteristics,
making it ideal for precision regulator applications.
n
Trimmed to High Accuracy: 0.075% Max
n
Low Drift: 10ppm/°C Max
n
Industrial Temperature Range
n
Temperature Coefficient Guaranteed to 125°C
n
Low Supply Current: 130µA Max (LT1460-2.5)
n
Minimum Output Current: 20mA
n
No Output Capacitor Required
n
Reverse Battery Protection
n
Minimum Input/Output Differential: 0.9V
This series reference provides supply current and power
dissipationadvantagesovershuntreferencesthatmustidle
the entire load current to operate. Additionally, the LT1460
does not require an output compensation capacitor, yet
is stable with capacitive loads. This feature is important
where PC board space is a premium or fast settling is
demanded. In the event of a reverse battery connection,
thesereferenceswillnotconductcurrent,andaretherefore
protected from damage.
n
Available in S0-8, MSOP-8, PDIP-8, TO-92 and
SOT- 23 Package
applications
n
Handheld Instruments
n
Precision Regulators
n
A/D and D/A Converters
Power Supplies
Hard Disk Drives
n
n
The LT1460 is available in the 8-lead MSOP, SO, PDIP and
the 3-lead TO-92 and SOT23 packages.
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.
typical application
Typical Distribution of Output Voltage
Basic Connection
S8 Package
20
1400 PARTS
18
LT1460-2.5
3.4V
FROM 2 RUNS
16
2.5V
IN
OUT
TO 20V
C1
0.1µF
GND
14
12
10
8
1460 TA01
6
4
2
0
–0.10
–0.06
–0.02 0 0.02
0.06
0.10
OUTPUT VOLTAGE ERROR (%)
1460 TA02
1460fc
ꢀ
LT1460
absolute MaxiMuM ratings
(Note 1)
Input Voltage.............................................................30V
Reverse Voltage......................................................–15V
Specified Temperature Range (Note 10)
Commercial (C)........................................ 0°C to 70°C
Industrial (I).........................................–40°C to 85°C
High (H)............................................. –40°C to 125°C
Storage Temperature Range (Note 2)..... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)...................300°C
Output Short-Circuit Duration, T = 25°C
A
V > 10V ............................................................5 sec
IN
V ≤ 10V..................................................... Indefinite
IN
pin conFiguration
TOP VIEW
IN 1
3 GND
OUT 2
S3 PACKAGE
3-LEAD PLASTIC SOT-23
= 125°C, θ = 228°C/W
T
JMAX
JA
TOP VIEW
TOP VIEW
DNC*
1
2
3
4
DNC*
DNC*
DNC*
1
2
3
4
8
7
6
5
DNC*
DNC*
8
7
6
5
V
IN
V
IN
DNC*
GND
V
OUT
DNC*
GND
V
OUT
DNC*
DNC*
N8 PACKAGE
8-LEAD PLASTIC DIP
S8 PACKAGE
8-LEAD PLASTIC SO
*CONNECTED INTERNALLY.
DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS
*CONNECTED INTERNALLY.
DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS
T
JMAX
= 150°C, θ = 130°C/W
T
JMAX
= 150°C, θ = 190°C/W
JA
JA
TOP VIEW
BOTTOM VIEW
DNC* 1
8 DNC*
7 DNC*
1
2
3
V
2
IN
6 V
5 DNC*
DNC* 3
GND 4
OUT
V
IN
V
GND
OUT
MS8 PACKAGE
8-LEAD PLASTIC MSOP
*CONNECTED INTERNALLY.
DO NOT CONNECT EXTERNAL
CIRCUITRY TO THESE PINS
Z PACKAGE
3-LEAD TO-92 PLASTIC
= 150°C, θ = 160°C/W
T
JMAX
JA
T
= 150°C, θ = 250°C/W
JA
JMAX
1460fc
ꢁ
LT1460
orDer inForMation
Lead Free Finish
TAPE AND REEL (MINI)
LT1460HCS3-2.5#TRMPBF
LT1460JCS3-2.5#TRMPBF
LT1460KCS3-2.5#TRMPBF
LT1460HCS3-3#TRMPBF
LT1460JCS3-3#TRMPBF
LT1460KCS3-3#TRMPBF
LT1460HCS3-3.3#TRMPBF
LT1460JCS3-3.3#TRMPBF
LT1460KCS3-3.3#TRMPBF
LT1460HCS3-5#TRMPBF
LT1460JCS3-5#TRMPBF
LT1460KCS3-5#TRMPBF
LT1460HCS3-10#TRMPBF
LT1460JCS3-10#TRMPBF
LT1460KCS3-10#TRMPBF
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
†
LT1460HCS3-2.5#TRMPBF
LT1460JCS3-2.5#TRPBF
LT1460KCS3-2.5#TRPBF
LT1460HCS3-3#TRPBF
LT1460JCS3-3#TRPBF
LT1460KCS3-3#TRPBF
LT1460HCS3-3.3#TRPBF
LT1460JCS3-3.3#TRPBF
LT1460KCS3-3.3#TRPBF
LT1460HCS3-5#TRPBF
LT1460JCS3-5#TRPBF
LT1460KCS3-5#TRPBF
LT1460HCS3-10#TRPBF
LT1460JCS3-10#TRPBF
LT1460KCS3-10#TRPBF
LTAC or LTH8
3-Lead Plastic SOT-23
3-Lead Plastic SOT-23
3-Lead Plastic SOT-23
3-Lead Plastic SOT-23
3-Lead Plastic SOT-23
3-Lead Plastic SOT-23
3-Lead Plastic SOT-23
3-Lead Plastic SOT-23
3-Lead Plastic SOT-23
3-Lead Plastic SOT-23
3-Lead Plastic SOT-23
3-Lead Plastic SOT-23
3-Lead Plastic SOT-23
3-Lead Plastic SOT-23
3-Lead Plastic SOT-23
†
LTAD or LTH8
0°C to 70°C
†
LTAE or LTH8
LTAN or LTH9
0°C to 70°C
†
0°C to 70°C
†
LTAP or LTH9
0°C to 70°C
†
LTAQ or LTH9
0°C to 70°C
†
LTAR or LTJ1
0°C to 70°C
†
LTAS or LTJ1
0°C to 70°C
†
LTAT or LTJ1
LTAK or LTJ2
0°C to 70°C
†
0°C to 70°C
†
LTAL or LTJ2
0°C to 70°C
†
†
LTAM or LTJ2
0°C to 70°C
†
LTAU or LTJ3
0°C to 70°C
†
LTAV or LTJ3
LTAW or LTJ3
0°C to 70°C
0°C to 70°C
TRM = 500 pieces. *Temperature grades and parametric grades are identified by a label on the shipping container.
†
Product grades are identified with either part marking.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on lead based finish parts.
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/
LEAD FREE FINISH
LT1460ACN8-2.5#PBF
LT1460BIN8-2.5#PBF
LT1460DCN8-2.5#PBF
LT1460EIN8-2.5#PBF
LT1460ACN8-5#PBF
LT1460BIN8-5#PBF
LT1460DCN8-5#PBF
LT1460EIN8-5#PBF
LT1460ACN8-10#PBF
LT1460BIN8-10#PBF
LT1460DCN8-10#PBF
LT1460EIN8-10#PBF
LT1460ACS8-2.5#PBF
LT1460BIS8-2.5#PBF
LT1460DCS8-2.5#PBF
LT1460EIS8-2.5#PBF
LT1460LHS8-2.5#PBF
LT1460MHS8-2.5#PBF
LT1460ACS8-5#PBF
LT1460BIS8-5#PBF
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
8-Lead Plastic DIP
8-Lead Plastic DIP
8-Lead Plastic DIP
8-Lead Plastic DIP
8-Lead Plastic DIP
8-Lead Plastic DIP
8-Lead Plastic DIP
8-Lead Plastic DIP
8-Lead Plastic DIP
8-Lead Plastic DIP
8-Lead Plastic DIP
8-Lead Plastic DIP
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
LT1460ACN8-2.5#TRPBF
LT1460BIN8-2.5#TRPBF
LT1460DCN8-2.5#TRPBF
LT1460EIN8-2.5#TRPBF
LT1460ACN8-5#TRPBF
LT1460BIN8-5#TRPBF
LT1460DCN8-5#TRPBF
LT1460EIN8-5#TRPBF
LT1460ACN8-10#TRPBF
LT1460BIN8-10#TRPBF
LT1460DCN8-10#TRPBF
LT1460EIN8-10#TRPBF
LT1460ACS8-2.5#TRPBF
LT1460BIS8-2.5#TRPBF
LT1460DCS8-2.5#TRPBF
LT1460EIS8-2.5#TRPBF
LT1460LHS8-2.5#TRPBF
LT1460MHS8-2.5#TRPBF
LT1460ACS8-5#TRPBF
LT1460BIS8-5#TRPBF
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
1460A2
460BI2
1460D2
460EI2
60LH25
60MH25
1460A5
460BI5
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
1460fc
ꢂ
LT1460
orDer inForMation
LEAD FREE FINISH
LT1460DCS8-5#PBF
LT1460EIS8-5#PBF
LT1460LHS8-5#PBF
LT1460MHS8-5#PBF
LT1460ACS8-10#PBF
LT1460BIS8-10#PBF
LT1460DCS8-10#PBF
LT1460EIS8-10#PBF
LT1460CCMS8-2.5#PBF
LT1460FCMS8-2.5#PBF
LT1460CCMS8-5#PBF
LT1460FCMS8-5#PBF
LT1460CCMS8-10#PBF
LT1460FCMS8-10#PBF
LT1460GCZ-2.5#PBF
LT1460GIZ-2.5#PBF
LT1460GCZ-5#PBF
TAPE AND REEL
PART MARKING
1460D5
460EI5
460LH5
460MH5
1460A1
460BI1
1460D1
460EI1
LTAA
PACKAGE DESCRIPTION
8-Lead Plastic SO
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
LT1460DCS8-5#TRPBF
LT1460EIS8-5#TRPBF
LT1460LHS8-5#TRPBF
LT1460MHS8-5#TRPBF
LT1460ACS8-10#TRPBF
LT1460BIS8-10#TRPBF
LT1460DCS8-10#TRPBF
LT1460EIS8-10#TRPBF
LT1460CCMS8-2.5#TRPBF
LT1460FCMS8-2.5#TRPBF
LT1460CCMS8-5#TRPBF
LT1460FCMS8-5#TRPBF
LT1460CCMS8-10#TRPBF
LT1460FCMS8-10#TRPBF
LT1460GCZ-2.5#TRPBF
LT1460GIZ-2.5#TRPBF
LT1460GCZ-5#TRPBF
LT1460GIZ-5#TRPBF
8-Lead Plastic SO
–40°C to 85°C
0°C to 70°C
8-Lead Plastic SO
8-Lead Plastic SO
–40°C to 85°C
0°C to 70°C
8-Lead Plastic SO
8-Lead Plastic SO
–40°C to 85°C
0°C to 70°C
8-Lead Plastic SO
8-Lead Plastic SO
–40°C to 85°C
0°C to 70°C
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
3-Lead Plastic TO-92
3-Lead Plastic TO-92
3-Lead Plastic TO-92
3-Lead Plastic TO-92
3-Lead Plastic TO-92
3-Lead Plastic TO-92
LTAB
0°C to 70°C
LTAF
0°C to 70°C
LTAG
0°C to 70°C
LTAH
0°C to 70°C
LTAJ
0°C to 70°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
LT1460GIZ-5#PBF
–40°C to 85°C
0°C to 70°C
LT1460GCZ-10#PBF
LT1460GIZ-10#PBF
LT1460GCZ-10#TRPBF
LT1460GIZ-10#TRPBF
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
available options
TEMPERATURE
PACKAGE TYPE
MS8
ACCURACY COEFFICIENT
N8
S8
Z
S3
TEMPERATURE
0°C to 70°C
(%)
0.075
0.10
0.10
0.10
0.125
0.15
0.25
0.25
0.20
0.20
0.20
0.40
0.50
(ppm/°C)
10
LT1460ACN8
LT1460BIN8
LT1460ACS8
LT1460BIS8
–40°C to 85°C
0°C to 70°C
10
15
LT1460CCMS8
LT1460FCMS8
0°C to 70°C
20
LT1460DCN8
LT1460EIN8
LT1460DCS8
LT1460EIS8
–40°C to 85°C
0°C to 70°C
20
25
0°C to 70°C
25
LT1460GCZ
LT1460GIZ
–40°C to 85°C
–40°C to 85°C/125°C
–40°C to 125°C
0°C to 70°C
25
20/50
50
LT1460LHS8
LT1460MHS8
20
LT1460HCS3
LT1460JCS3
LT1460KCS3
0°C to 70°C
20
0°C to 70°C
50
1460fc
ꢃ
LT1460
electrical characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT + 2.5V, IOUT = 0 unless otherwise specified.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage
LT1460ACN8-2.5, ACS8-2.5
2.49813
–0.075
2.50188
0.075
V
%
LT1460BIN8-2.5, BIS8-2.5, CCMS8-2.5,
DCN8-2.5, DCS8-2.5
2.4975
–0.10
2.5025
0.10
V
%
LT1460EIN8-2.5, EIS8-2.5
2.49688
–0.125
2.50313
0.125
V
%
LT1460FCMS8-2.5
2.49625
–0.15
2.50375
0.15
V
%
LT1460GCZ-2.5, GIZ-2.5
LT1460LHS8-2.5, MHS8-2.5
LT1460ACN8-5, ACS8-5
2.49375
–0.25
2.50625
0.25
V
%
2.495
–0.20
2.505
0.20
V
%
4.99625
–0.075
5.00375
0.075
V
%
LT1460BIN8-5, BIS8-5, CCMS8-5,
DCN8-5, DCS8-5
4.995
–0.10
5.005
0.10
V
%
LT1460EIN8-5, EIS8-5
4.99375
–0.125
5.00625
0.125
V
%
LT1460FCMS8-5
4.9925
–0.15
5.0075
0.15
V
%
LT1460GCZ-5, GIZ-5
LT1460LHS8-5, MHS8-5
LT1460ACN8-10, ACS8-10
4.9875
–0.25
5.0125
0.25
V
%
4.990
–0.20
5.010
0.20
V
%
9.9925
–0.075
10.0075
0.075
V
%
LT1460BIN8-10, BIS8-10, CCMS8-10,
DCN8-10, DCS8-10
9.990
–0.10
10.010
0.10
V
%
LT1460EIN8-10, EIS8-10
9.9875
–0.125
10.0125
0.125
V
%
LT1460FCMS8-10
9.985
–0.15
10.0015
0.15
V
%
LT1460GCZ-10, GIZ-10
9.975
–0.25
10.025
0.25
V
%
LT1460HC
LT1460JC
LT1460KC
–0.2
–0.4
–0.5
0.2
0.4
0.5
%
%
%
Output Voltage Temperature Coefficient (Note 3)
T
≤ T ≤ T
MIN J MAX
l
l
l
l
l
l
l
LT1460ACN8, ACS8, BIN8, BIS8
LT1460CCMS8
5
10
15
20
25
20
50
50
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ppm/°C
7
LT1460DCN8, DCS8, EIN8, EIS8
LT1460FCMS8, GCZ, GIZ
LT1460LHS8
10
12
10
25
25
–40°C to 85°C
–40°C to 125°C
–40°C to 125°C
LT1460MHS8
l
l
l
LT1460HC
LT1460JC
LT1460KC
10
10
25
20
20
50
ppm/°C
ppm/°C
ppm/°C
1460fc
ꢄ
LT1460
electrical characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT + 2.5V, IOUT = 0 unless otherwise specified.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Line Regulation
V
V
V
V
+ 0.9V ≤ V ≤ V
OUT
+ 2.5V
+ 2.5V
30
60
80
ppm/V
ppm/V
OUT
OUT
OUT
OUT
OUT
OUT
OUT
IN
l
l
l
l
l
l
l
l
l
l
LT1460A, LT1460B, LT1460C, LT1460D, LT1460E,
LT1460F, LT1460G, LT1460H, LT1460L, LT1460M
+ 2.5V ≤ V ≤ 20V
10
150
50
25
35
ppm/V
ppm/V
IN
LT1460HC, LT1460JC, LT1460KC
+ 0.9V ≤ V ≤ V
800
1000
ppm/V
ppm/V
IN
OUT
+ 2.5V ≤ V ≤ 20V
100
130
ppm/V
ppm/V
IN
Load Regulation Sourcing (Note 4)
I
I
I
I
I
I
= 100µA
= 10mA
= 20mA
1500
80
2800
3500
ppm/mA
ppm/mA
LT1460A, LT1460B, LT1460C, LT1460D, LT1460E,
LT1460F, LT1460G, LT1460H, LT1460L, LT1460M
135
180
ppm/mA
ppm/mA
70
100
140
ppm/mA
ppm/mA
0°C to 70°C
LT1460HC, LT1460JC, LT1460KC
= 100µA
= 10mA
= 20mA
1000
50
3000
4000
ppm/mA
ppm/mA
OUT
OUT
OUT
200
300
ppm/mA
ppm/mA
20
70
100
ppm/mA
ppm/mA
Thermal Regulation (Note 5)
0.5
2.5
ppm/mW
ΔP = 200mW
LT1460A, LT1460B, LT1460C, LT1460D, LT1460E,
LT1460F, LT1460G, LT1460H, LT1460L, LT1460M
LT1460HC, LT1460JC, LT1460KC
Dropout Voltage (Note 6)
2.5
10
ppm/mW
V
ΔP = 200mW
l
l
V
V
– V , I
= 0
0.9
IN
OUT OUT
– V , I
= 10mA
1.3
1.4
V
V
IN
OUT OUT
Output Current
Reverse Leakage
Supply Current
Short V
to GND
40
0.5
100
mA
µA
OUT
l
l
l
l
l
l
l
l
l
V
= –15V
10
IN
LT1460-2.5
130
165
µA
µA
LT1460-5
125
190
115
145
145
160
215
175
225
µA
µA
LT1460-10
270
360
µA
µA
LT1460S3-2.5
LT1460S3-3
LT1460S3-3.3
LT1460S3-5
LT1460S3-10
145
175
µA
µA
180
220
µA
µA
180
220
µA
µA
200
240
µA
µA
270
350
µA
µA
1460fc
ꢅ
LT1460
electrical characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT + 2.5V, IOUT = 0 unless otherwise specified.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
µV
Output Voltage Noise (Note 7)
LT1460-2.5
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
10
10
P-P
LT1460A, LT1460B, LT1460C, LT1460D, LT1460E,
LT1460F, LT1460G, LT1460H, LT1460L, LT1460M
µV
µV
µV
RMS
LT1460-5
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
20
20
µV
P-P
RMS
LT1460-10
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
40
35
µV
P-P
RMS
LT1460HC, LT1460JC, LT1460KC
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
4
4
ppm (P-P)
ppm (RMS)
Long-Term Stability of Output Voltage (Note 8)
S8 Pkg
40
ppm/√kHr
LT1460HC, LT1460JC, LT1460KC
100
ppm/√kHr
Hysteresis (Note 9)
25
160
ppm
ppm
ΔT = 0°C to 70°C
ΔT = –40°C to 85°C
LT1460A, LT1460B, LT1460C, LT1460D, LT1460E,
LT1460F, LT1460G, LT1460H, LT1460L, LT1460M
l
l
LT1460HC, LT1460JC, LT1460KC
50
250
ppm
ppm
ΔT = 0°C to 70°C
ΔT = –40°C to 85°C
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.
and then integrated for a fixed period, making the final reading an average
as opposed to RMS. A correction factor of 1.1 is used to convert from
average to RMS and a second correction of 0.88 is used to correct for the
nonideal pass band of the filters.
Note 2: If the part is stored outside of the specified temperature range, the
output may shift due to hysteresis.
Note 8: 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. Significant improvement in long-term drift can
be realized by preconditioning the IC with a 100 hour to 200 hour, 125°C
burn-in. Long-term stability will also be affected by differential stresses
between the IC and the board material created during board assembly. See
PC Board Layout in the Applications Information section.
Note 9: 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 85°C or –40°C before successive measurements. Hysteresis
is roughly proportional to the square of the temperature change. For
instruments that are stored at reasonably well-controlled temperatures
(within 20 or 30 degrees of operating temperature) hysteresis is generally
not a problem.
Note 3: Temperature coefficient is measured by dividing the change in
output voltage by the specified temperature range. Incremental slope is
also measured at 25°C.
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: Thermal regulation is caused by die temperature gradients created
by load current or input voltage changes. This effect must be added to
normal line or load regulation. This parameter is not 100% tested.
Note 6: Excludes load regulation errors. For LT1460S3, ΔV
≤ 0.2%. For
OUT
all other packages, ΔV
≤ 0.1%.
OUT
Note 7: Peak-to-peak noise is measured with a single highpass filter at
0.1Hz and 2-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 sec. RMS noise is measured with a single highpass filter at 10Hz and
a 2-pole lowpass filter at 1kHz. The resulting output is full wave rectified
Note 10: The LT1460S3 is guaranteed functional over the operating
temperature range of –40° to 85°C.
1460fc
ꢆ
LT1460
typical perForMance characteristics
LT1460-2.5 (N8, S8, MS8, Z Packages)
2.5V Minimum Input-Output
Voltage Differential
2.5V Load Regulation, Sourcing
2.5V Load Regulation, Sinking
100
10
6
5
4
3
2
1
0
80
70
60
50
40
30
20
10
0
125°C
125°C
25°C
–55°C
25°C
25°C
125°C
1
–55°C
–55°C
0.1
0
0.5
1.0
1.5
2.0
2.5
0.1
1
10
100
0
0.5
1.0
1.5
INPUT-OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
1460 G02
1460 G03
1460 G01
2.5V Output Voltage
Temperature Drift
2.5V Supply Current vs Input
Voltage
2.5V Line Regulation
2.503
2.502
2.501
2.500
2.499
2.498
175
150
125
100
75
2.5014
2.5010
2.5006
2.5002
2.4998
2.4994
2.4990
3 TYPICAL PARTS
125°C
25°C
125°C
25°C
–55°C
50
–55°C
25
0
–50
0
25
50
75
100
–25
0
5
10
15
20
0
2
4
6
8
10 12 14 16 18 20
TEMPERATURE (°C)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
1460 G04
1460 G05
1460 G06
2.5V Power Supply Rejection
Ratio vs Frequency
2.5V Output Impedance vs
Frequency
2.5V Transient Responses
90
80
70
60
50
40
30
20
10
0
1k
C = 0.1µF
L
10
1
C
= 0
L
100
0.1
0
10
1
1460 G09
I
= 10mA
OUT
C = 1µF
L
–10
100
1k
10k
100k
1M
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
1460 G08
1460 G07
1460fc
ꢇ
LT1460
typical perForMance characteristics
2.5V Output Voltage Noise
Spectrum
2.5V Long-Term Drift
Three Typical Parts (S8 Package)
2.5V Output Noise 0.1Hz to 10Hz
1000
2.5000
2.4998
2.4996
2.4994
2.4992
2.4990
100
0
1
2
3
4
5
6
7
8
9
10
0
200
400
600
800
1000
10
100
1k
10k
100k
TIME (SEC)
TIME (HOURS)
FREQUENCY (Hz)
1460 G11
1460 G12
1460 G10
LT1460-5 (N8, S8, MS8, Z Packages)
5V Minimum Input-Output Voltage
Differential
5V Load Regulation, Sourcing
5V Load Regulation, Sinking
6
5
4
3
2
1
0
100
10
100
90
80
70
60
50
40
30
20
10
0
125°C
25°C
125°C
25°C
–55°C
25°C
–55°C
1
–55°C
125°C
4
0.1
0.1
1
10
100
0
1
2
3
5
0
0.5
1.0
1.5
2.0
2.5
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
INPUT-OUTPUT VOLTAGE (V)
1460 G13
1460 G15
1460 G14
5V Output Voltage
Temperature Drift
5V Supply Current vs Input
Voltage
5V Line Regulation
5.004
5.002
5.000
4.998
4.996
4.994
200
180
160
140
120
100
80
5.002
5.000
4.998
4.996
4.994
4.992
3 TYPICAL PARTS
125°C
25°C
25°C
125°C
–55°C
60
–55°C
40
20
0
2
4
6
8
10 12 14 16 18 20
–50
0
25
50
75
100
0
–25
0
2
4
6
8
10 12 14 16 18 20
TEMPERATURE (°C)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
1460 G16
1460 G17
1460 G18
1460fc
ꢈ
LT1460
typical perForMance characteristics
LT1460-5 (N8, S8, MS8, Z Packages)
5V Power Supply Rejection Ratio
vs Frequency
5V Output Impedance vs
Frequency
5V Transient Responses
90
80
70
60
50
40
30
20
10
0
1k
100
10
C
= 0
10
1
L
C = 0.1µF
L
0.1
0
1
C = 1µF
L
1460 G21
0.2ms/DIV
I
= 10mA
OUT
0.1
100
1k
10k
100k
1M
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
1460 G19
1460 G20
5V Output Voltage Noise
Spectrum
5V Output Noise 0.1Hz to 10Hz
3000
2000
1000
100
0
1
2
3
4
5
6
7
8
9
10
10
100
1k
10k
100k
FREQUENCY (Hz)
TIME (SEC)
1460 G22
1460 G23
LT1460-10 (N8, S8, MS8, Z Packages)
10V Minimum Input/Output
Voltage Differential
10V Load Regulation, Sourcing
10V Load Regulation, Sinking
10
9
100
100
90
80
70
60
50
40
30
20
10
0
8
7
10
25°C
6
5
125°C
25°C
–55°C
125°C
4
3
2
1
0
–55°C
25°C
125°C
1
–55°C
0.1
0
0.5
1.0
1.5
2.0
2.5
0.1
1
10
100
0
1
2
3
4
5
INPUT/OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
1460 G24
1460 G26
1460 G25
1460fc
ꢀ0
LT1460
typical perForMance characteristics
10V Output Voltage
Temperature Drift
10V Supply Current vs Input
Voltage
10V Line Regulation
10.006
10.002
9.998
9.994
9.990
9.986
9.982
400
360
320
280
240
200
160
120
80
10.004
10.000
9.996
9.992
9.988
9.984
9.980
3 TYPICAL PARTS
25°C
–55°C
25°C
–55°C
125°C
125°C
40
0
–50
0
25
50
75
100
0
2
4
6
8
10 12 14 16 18 20
6
8
14
16
18
20
–25
10
12
TEMPERATURE (°C)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
1460 G27
1460 G28
1460 G29
10V Power Supply Rejection
Ratio vs Frequency
10V Output Impedance vs
Frequency
10V Transient Responses
100
90
80
70
60
50
40
30
20
10
0
1000
100
10
C = 0µF
10
1
L
C = 0.1µF
L
0.1
0
C = 1µF
L
1
1460 G32
200µs/DIV
I
= 10mA
OUT
0.1
0.1
1
10
100
1000
0.01
0.1
1
10
100
1000
INPUT FREQUENCY (kHz)
FREQUENCY (kHz)
1460 G30
1460 G31
10V Output Voltage Noise
Spectrum
10V Output Noise 0.1Hz to 10Hz
10
1
0.1
0.01
0
2
4
6
8
10
12
14
0.1
1
10
100
FREQUENCY (kHz)
TIME (SEC)
1460 G33
1460 G34
1460fc
ꢀꢀ
LT1460
typical perForMance characteristics
Characteristic curves are similar for all voltage
options of the LT1460S3. Curves from the LT1460S3-2.5 and the LT1460S3-10 represent the extremes of the voltage options.
Characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output.
LT1460S3-2.5V Minimum Input-
Output Voltage Differential
LT1460S3-2.5V Load Regulation,
Sourcing
LT1460S3-2.5V Load Regulation,
Sinking
100
10
1
0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
120
100
125°C
–55°C
80
60
25°C
125°C
–55°C
25°C
25°C
–55°C
40
20
0
125°C
0.1
0.1
1
10
100
0
0.5
1.0
1.5
2.0
2.5
0
1
2
3
4
5
INPUT-OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
1460 G36
1460 G35
1460 G37
LT1460S3-2.5V Output Voltage
Temperature Drift
LT1460S3-2.5V Supply Current
vs Input Voltage
LT1460S3-2.5V Line Regulation
2.502
2.501
2.500
2.499
2.498
2.497
2.496
2.495
2.494
2.503
2.502
2.501
2.500
250
200
150
100
50
THREE TYPICAL PARTS
25°C
25°C
125°C
–55°C
–55°C
125°C
2.499
2.498
2.497
0
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
0
2
4
6
8
10 12 14 16 18 20
5
10
15
0
20
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
1460 G38
1460 G40
1460 G39
LT1460S3-2.5V Power Supply
Rejection Ratio vs Frequency
LT1460S3-2.5V Output Impedance
vs Frequency
LT1460S3-2.5V Transient
Response
80
70
60
50
40
30
20
10
0
1000
100
10
C
= 0µF
L
20
10
C
= 0.1µF
L
1
C
= 1µF
L
0.1
1
1460 G43
200µs/DIV
C
= 0µF
LOAD
0.1
0.1
1
10
100
1000
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
FREQUENCY (kHz)
1460 G41
1460 G42
1460fc
ꢀꢁ
LT1460
typical perForMance characteristics
Characteristic curves are similar for all voltage
options of the LT1460S3. Curves from the LT1460S3-2.5 and the LT1460S3-10 represent the extremes of the voltage options.
Characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output.
LT1460S3-2.5V Output Voltage
Noise Spectrum
LT1460S3-2.5V Output Noise
0.1Hz to 10Hz
LT1460S3-10V Minimum Input-
Output Voltage Differential
1000
100
10
1
125°C
25°C
–55°C
100
0.1
TIME (2 SEC/DIV)
0
0.5
1.0
1.5
2.0
2.5
10
100
1k
10k
100k
1460 G45
INPUT-OUTPUT VOLTAGE (V)
FREQUENCY (Hz)
1460 G46
1460 G44
LT1460S3-10V Load Regulation,
Sourcing
LT1460S3-10V Load Regulation,
Sinking
LT1460S3-10V Output Voltage
Temperature Drift
35
30
25
20
15
10
5
250
200
150
100
50
10.006
10.004
10.002
10.000
9.998
9.996
9.994
9.992
9.990
9.988
9.986
9.984
9.982
THREE TYPICAL PARTS
125°C
25°C
–55°C
–55°C
0
–5
–10
125°C
25°C
0
0.1
1
10
100
0
1
2
3
4
5
–50
0
25
50
75 100 125
–25
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
1460 G49
1460 G48
1460 G47
LT1460S3-10V Supply Current
vs Input Voltage
LT1460S3-10V Line Regulation
10.010
10.005
10.000
9.995
350
300
25°C
250
25°C
–55°C
125°C
125°C
–55°C
200
150
100
50
9.990
9.985
9.980
0
14
INPUT VOLTAGE (V)
18
20
6
8
10
12
16
0
6
10 12 14 16 18 20
2
4
8
INPUT VOLTAGE (V)
1460 G51
1460 G50
1460fc
ꢀꢂ
LT1460
typical perForMance characteristics
Characteristic curves are similar for all voltage
options of the LT1460S3. Curves from the LT1460S3-2.5 and the LT1460S3-10 represent the extremes of the voltage options.
Characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output.
LT1460S3-10V Power Supply
Rejection Ratio vs Frequency
LT1460S3-10V Output Impedance
vs Frequency
LT1460S3-10V Transient
Response
100
90
80
70
60
50
40
30
20
10
0
1000
100
10
20
10
C
= 0µF
L
C
= 0.1µF
L
1
C
= 1µF
L
0.1
1
1460 G54
200µs/DIV
C
= 0µF
LOAD
0.1
0.1
1
10
100
1000
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
FREQUENCY (kHz)
1460 G52
1460 G53
LT1460S3-10V Output Voltage
Noise Spectrum
LT1460S3-10V Output Noise
0.1Hz to 10Hz
10
1
0.1
0.01
0.1
1
10
100
TIME (2 SEC/DIV)
1460 G56
FREQUENCY (kHz)
1460 G55
1460fc
ꢀꢃ
LT1460
applications inForMation
Longer Battery Life
the ringing can be reduced with a small resistor in series
with the reference output as shown in Figure 4. Figure 5
Series references have a large advantage over older shunt
style references. Shunt references require a resistor from
the power supply to operate. This resistor must be chosen
tosupplythemaximumcurrentthatcaneverbedemanded
by the circuit being regulated. When the circuit being
controlled is not operating at this maximum current, the
shunt reference must always sink this current, resulting
in high dissipation and short battery life.
shows the response of the LT1460-2.5 with a R = 2Ω and
S
2.5V
1.5V
V
GEN
R
= 10k
V
V
L
L
OUT
OUT
R
= 1k
The LT1460 series reference does not require a current set-
ting resistor and can operate with any supply voltage from
V
OUT
+0.9Vto20V. Whenthecircuitrybeingregulateddoes
1460 F02
1µs/DIV
notdemandcurrent, theLT1460reducesitsdissipationand
batterylifeisextended.Ifthereferenceisnotdeliveringload
current it dissipatesonly a fewmW, yetthe same configura-
tion can deliver 20mA of load current when demanded.
Figure 2. CL = 0
2.5V
1.5V
V
GEN
Capacitive Loads
R
R
= 10k
The LT1460 is designed to be stable with capacitive loads.
With no capacitive load, the reference is ideal for fast set-
tling, applications where PC board space is a premium,
or where available capacitance is limited.
V
V
L
L
OUT
OUT
= 1k
1460 F03
The test circuit for the LT1460-2.5 shown in Figure 1 is
used to measure the response time for various load cur-
rents and load capacitors. The 1V step from 2.5V to 1.5V
20µs/DIV
Figure 3. CL = 0.01µF
produces a current step of 1mA or 100µA for R = 1k or
L
V
OUT
R
R
L
R = 10k. Figure 2 shows the response of the reference
S
L
V
= 5V
C
LT1460-2.5
IN
V
GEN
with no load capacitance.
2.5V
1.5V
IN
C
L
0.1µF
The reference settles to 2.5mV (0.1%) in less than 1µs
for a 100µA pulse and to 0.1% in 1.5µs with a 1mA step.
When load capacitance is greater than 0.01µF, the refer-
ence begins to ring due to the pole formed with the output
impedance. Figure 3 shows the response of the reference
to a 1mA and 100µA load current step with a 0.01µF load
capacitor. The ringing can be greatly reduced with a DC
loadassmallas200µA.Withlargeoutputcapacitors,≥1µF,
1460 F04
Figure 4. Isolation Resistor Test Circuit
V
2.5V
1.5V
GEN
R
R
= 1k
L
S
V
V
OUT
OUT
= 0
R
R
= 1k
= 2Ω
R
L
L
S
V
OUT
V
= 5V
LT1460-2.5
IN
V
GEN
2.5V
1.5V
C
IN
0.1µF
C
L
1460 F05
1460 F01
0.1ms/DIV
Figure 1. Response Time Test Circuit
Figure 5. Effect of RS for CL = 1µF
1460fc
ꢀꢄ
LT1460
applications inForMation
C = 1µF. R should not be made arbitrarily large because
and 100µA load current step with a 0.01µF load capacitor.
Figure 9 to Figure 11 illustrate response of the LT1460-10.
The 1V step from 10V to 9V produces a current step of
L
S
it will limit the load regulation.
Figure 6 to Figure 8 illustrate response in the LT1460-5.
The 1V step from 5V to 4V produces a current step of
1mA or 100µA for R = 1k or R = 10k. Figure 10 shows
L
L
the response of the reference with no load capacitance.
1mA or 100µA for R = 1k or R = 10k. Figure 7 shows the
L
L
response of the reference with no load capacitance.
The reference settles to 10mV (0.1%) in 0.4µs for a 100µA
pulse and to 0.1% in 0.8µs with a 1mA step. When load
capacitance is greater than 0.01µF, the reference begins
to ring due to the pole formed with the output impedance.
Figure11showstheresponseofthereferencetoa1mAand
100µA load current step with a 0.01µF load capacitor.
The reference settles to 5mV (0.1%) in less than 2µs for
a 100µA pulse and to 0.1% in 3µs with a 1mA step. When
loadcapacitanceisgreaterthan0.01µF,thereferencebegins
to ring due to the pole formed with the output impedance.
Figure 8 shows the response of the reference to a 1mA
R
L
R
L
V
V
OUT
OUT
V
= 12.5V
C
LT1460-10
V
= 5V
C
LT1460-5
IN
V
GEN
IN
V
GEN
10V
9V
5V
4V
IN
IN
C
C
L
L
0.1µF
0.1µF
1460 F09
1460 F06
Figure 6. Response Time Test Circuit
Figure 9. Response Time Test Circuit
5V
V
V
10V
9V
GEN
GEN
4V
V
V
V
V
R
= 10k
R
L
= 10k
OUT
OUT
OUT
OUT
L
L
R
= 1k
R
L
= 1k
1460 F07
1460 F10
2µs/DIV
2µs/DIV
Figure 7. CL = 0
Figure 10. CL = 0
10V
9V
V
5V
4V
GEN
V
V
GEN
OUT
V
V
R
L
R
L
= 10k
= 1k
R
R
= 10k
OUT
OUT
L
= 1k
V
L
OUT
1460 F08
1460 F11
10µs/DIV
10µs/DIV
Figure 8. CL = 0.01µF
Figure 11. CL = 0.01µF
1460fc
ꢀꢅ
LT1460
applications inForMation
The LT1460S3 family of references are designed to be
stable with a large range of capacitive loads. With no
capacitive load, these references are ideal for fast settling
or applications where PC board space is a premium. The
test circuit shown in Figure 12 is used to measure the
response time and stability of various load currents and
load capacitors. This circuit is set for the 2.5V option. For
other voltage options, the input voltage must be scaled
up and the output voltage generator offset voltage must
be adjusted. The 1V step from 2.5V to 1.5V produces a
1mA and 10mA load steps with no load capacitance, and
Figure 14 shows a 1mA and 10mA load step with a 0.1µF
output capacitor. Figure 15 shows the response to a 1mA
load step with C = 1µF and 4.7µF.
L
The frequency compensation of the LT1460S3 version is
slightlydifferentthanthatoftheotherpackages.Additional
care must be taken when choosing load capacitance in an
application circuit.
Table 1 gives the maximum output capacitance for vari-
ous load currents and output voltages of the LT1460S3 to
avoid instability. Load capacitors with low ESR (effective
series resistance) cause more ringing than capacitors
with higher ESR such as polarized aluminum or tantalum
capacitors.
current step of 10mA or 1mA for R = 100Ω or R = 1k.
L
L
Figure 13 shows the response of the reference to these
R
L
V
OUT
V
= 2.5V
LT1460S3-2.5
IN
V
GEN
2.5V
1.5V
C
IN
C
L
0.1µF
1460 F12
V
2.5V
1.5V
GEN
Figure 12. Response Time Test Circuit
V
V
1mA
OUT
OUT
V
2.5V
GEN
10mA
1.5V
V
V
1mA
OUT
OUT
1460 F14
100µs/DIV
Figure 14. CL = 0.1µF
10mA
1460 F13
1µs/DIV
V
2.5V
1.5V
GEN
Figure 13. CL = 0µF
V
V
1µA
OUT
OUT
4.7µA
1460 F15
100µs/DIV
Figure 15. IOUT = 1mA
1460fc
ꢀꢆ
LT1460
applications inForMation
Hysteresis
Table 1. Maximum Output Capacitance for LT1460S3
VOLTAGE
HysteresisdatashowninFigure17andFigure18represents
the worst-case data taken on parts from 0°C to 70°C and
from –40°C to 85°C. The device is capable of dissipating
relativelyhighpower,i.e.,fortheLT1460S3-2.5,PD=17.5V
• 20mA = 350mW. The thermal resistance of the SOT-23
package is 325°C/W and this dissipation causes a 114°C
OPTION
2.5V
3V
I
= 100µA
I
= 1mA
I
= 10mA
I
= 20mA
OUT
OUT
OUT
OUT
>10µF
>10µF
>10µF
>10µF
>10µF
>10µF
2µF
0.68µF
>10µF
>10µF
>10µF
1µF
2µF
0.68µF
0.68µF
0.68µF
0.1µF
3.3V
5V
1µF
1µF
10V
0.15µF
internalriseproducingajunctiontemperatureofT =25°C
J
+ 114°C = 139°C. This elevated temperature will cause
the output to shift due to thermal hysteresis. For highest
performance in precision applications, do not let the
LT1460S3’s junction temperature exceed 85°C.
Long-Term Drift
Long-termdriftcannotbeextrapolatedfromaccelerated
hightemperaturetesting.Thiserroneoustechniquegives
drift numbers that are wildly optimistic. The only way
long-term drift can be determined is to measure it over
the time interval of interest. The LT1460S3 long-term
drift data was taken on over 100 parts that were soldered
into PC boards similar to a “real world” application. The
boards were then placed into a constant temperature oven
18
WORST-CASE HYSTERESIS
ON 40 UNITS
16
14
12
10
8
70°C TO 25°C
0°C TO 25°C
with T = 30°C, their outputs were scanned regularly and
A
6
measured with an 8.5 digit DVM. Figure 16 shows typical
4
long-term drift of the LT1460S3s.
2
150
100
0
160 200 240
–240 –200 –160 –120 –80 –40
0
40 80 120
HYSTERESIS (ppm)
1460 F17
Figure 17. 0°C to 70°C Hysteresis
50
0
9
8
7
6
5
4
3
2
1
0
WORST-CASE HYSTERESIS
ON 34 UNITS
–50
–100
–150
85°C TO 25°C
–40°C TO 25°C
0
100 200 300 400 500 600 700 800 900 1000
HOURS
1460 F16
Figure 16. Typical Long-Term Drift
400 500 600
100 200 300
–600 –500 –400 –300 –200 –100
0
HYSTERESIS (ppm)
1460 F18
Figure 18. –40°C to 85°C Hysteresis
1460fc
ꢀꢇ
LT1460
applications inForMation
Input Capacitance
Total worst-case output error is:
It is recommended that a 0.1µF or larger capacitor be
added to the input pin of the LT1460. This can help with
stability when large load currents are demanded.
0.075% + 0.035% + 0.070% = 0.180%.
Table 1 gives worst-case accuracy for the LT1460AC, CC,
DC, FC, GC from 0°C to 70°C and the LT1460BI, EI, GI
from –40°C to 85°C.
Output Accuracy
Note that the LT1460-5 and LT1460-10 give identical ac-
curacy as a fraction of their respective output voltages.
Likeallreferences,eitherseriesorshunt,theerrorbudgetof
theLT1460-2.5ismadeupofprimarilythreecomponents:
initialaccuracy,temperaturecoefficientandloadregulation.
Line regulation is neglected because it typically contrib-
utes only 30ppm/V, or 75µV for a 1V input change. The
LT1460-2.5typicallyshiftslessthan0.01%whensoldered
into a PCB, so this is also neglected (see PC Board Layout
section). The output errors are calculated as follows for a
100µA load and 0°C to 70°C temperature range:
PC Board Layout
In 13- to 16-bit systems where initial accuracy and tem-
perature coefficient calibrations have been done, the me-
chanical and thermal stress on a PC board (in a cardcage
for instance) can shift the output voltage and mask the
true temperature coefficient of a reference. In addition,
the mechanical stress of being soldered into a PC board
can cause the output voltage to shift from its ideal value.
Surface mount voltage references (MS8 and S8) are the
most susceptible to PC board stress because of the small
amount of plastic used to hold the lead frame.
LT1460AC
Initial accuracy = 0.075%
For I = 100µA, and using the LT1460-2.5 for calculation,
O
3500ppm
mA
A simple way to improve the stress-related shifts is to
mount the reference near the short edge of the PC board,
or in a corner. The board edge acts as a stress boundary,
or a region where the flexure of the board is minimum.
The package should always be mounted so that the leads
absorb the stress and not the package. The package is
generally aligned with the leads parallel to the long side
of the PC board as shown in Figure 20a.
ΔVOUT
=
0.1mA 2.5V = 875µV
which is 0.035%.
For temperature 0°C to 70°C the maximum ΔT = 70°C,
10ppm
ΔV
=
70°C 2.5V = 1.75mV
OUT
°C
A qualitative technique to evaluate the effect of stress on
voltage references is to solder the part into a PC board and
which is 0.07%.
Table 2. Worst-Case Output Accuracy Over Temperature
I
LT1460AC LT1460BI LT1460CC LT1460DC LT1460EI LT1460FC LT1460GC LT1460GI LT1460HC LT1460JC LT1460KC
OUT
0
0.145%
0.180%
0.325%
0.425%
0.225%
0.260%
0.405%
N/A
0.205%
0.240%
0.385%
0.485%
0.240%
0.275%
0.420%
0.520%
0.375%
0.410%
0.555%
N/A
0.325%
0.360%
0.505%
0.605%
0.425%
0.460%
0.605%
0.705%
0.562%
0.597%
0.742%
N/A
0.340%
0.380%
0.640%
0.540%
0.540%
0.580%
0.840%
0.740%
0.850%
0.890%
1.15%
1.05%
100µA
10mA
20mA
1460fc
ꢀꢈ
LT1460
applications inForMation
deform the board a fixed amount as shown in Figure 19.
The flexure #1 represents no displacement, flexure #2 is
concavemovement,flexure#3isrelaxationtonodisplace-
ment and finally, flexure #4 is a convex movement. This
motion is repeated for a number of cycles and the relative
output deviation is noted. The result shown in Figure 20a
is for two LT1460S8-2.5s mounted vertically and Figure
20b is for two LT1460S8-2.5s mounted horizontally. The
parts oriented in Figure 20a impart less stress into the
package because stress is absorbed in the leads. Figures
20a and 20b show the deviation to be between 125µV and
250µV and implies a 50ppm and 100ppm change respec-
tively. This corresponds to a 13- to 14-bit system and is
not a problem for most 10- to 12-bit systems unless the
system has a calibration. In this case, as with temperature
hysteresis, this low level can be important and even more
careful techniques are required.
The most effective technique to improve PC board stress
is to cut slots in the board around the reference to serve
as a strain relief. These slots can be cut on three sides of
thereferenceandtheleadscanexitonthefourthside. This
“tongue” of PC board material can be oriented in the long
direction of the board to further reduce stress transferred
to the reference.
1
2
3
The results of slotting the PC boards of Figures 20a and
20b are shown in Figures 21a and 21b. In this example
the slots can improve the output shift from about 100ppm
to nearly zero.
4
1460 F19
Figure 19. Flexure Numbers
2
2
1
1
LONG DIMENSION
LONG DIMENSION
0
0
–1
–1
0
0
40
40
10
20
FLEXURE NUMBER
30
10
20
FLEXURE NUMBER
30
1460 F20a
1460 F20b
Figure 20a. Two Typical LT1460S8-2.5s, Vertical
Orientation Without Slots
Figure 20b. Two Typical LT1460S8-2.5s, Horizontal
Orientation Without Slots
2
1
2
1
0
0
SLOT
SLOT
–1
–1
0
0
40
40
10
20
30
10
20
30
FLEXURE NUMBER
FLEXURE NUMBER
1460 F21a
1460 F21b
Figure 21a. Same Two LT1460S8-2.5s in Figure 16a,
but with Slots
Figure 21b. Same Two LT1460S8-2.5s in Figure 16b,
but with Slots
1460fc
ꢁ0
LT1460
siMpliFieD scheMatic
V
CC
V
OUT
GND
1460 SS
package Description
S3 Package
3-Lead Plastic SOT-23
(Reference LTC DWG # 05-08-1631)
0.764
2.80 – 3.04
(.110 – .120)
0.8 ±0.127
2.10 – 2.64
1.20 – 1.40
2.74
(.083 – .104) (.047 – .060)
0.96 BSC
1.92
0.45 – 0.60
(.017 – .024)
RECOMMENDED SOLDER PAD LAYOUT
0.89 – 1.03
(.035 – .041)
0.37 – 0.51
(.015 – .020)
0.89 – 1.12
(.035 – .044)
0.01 – 0.10
(.0004 – .004)
0.55
(.022)
REF
1.78 – 2.05
(.070 – .081)
0.09 – 0.18
(.004 – .007)
S3 SOT-23 0502
NOTE:
1. CONTROLLING DIMENSION: MILLIMETERS
MILLIMETERS
2. DIMENSIONS ARE IN
(INCHES)
3. DRAWING NOT TO SCALE
4. DIMENSIONS ARE INCLUSIVE OF PLATING
5. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
6. MOLD FLASH SHALL NOT EXCEED .254mm
7. PACKAGE JEDEC REFERENCE IS TO-236 VARIATION AB
1460fc
LT1460
package Description
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.400*
(10.160)
MAX
8
7
6
5
4
.255 ± .015*
(6.477 ± 0.381)
1
2
3
.130 ± .005
.300 – .325
.045 – .065
(3.302 ± 0.127)
(1.143 – 1.651)
(7.620 – 8.255)
.065
(1.651)
TYP
.008 – .015
(0.203 – 0.381)
.120
.020
(0.508)
MIN
(3.048)
MIN
+.035
.325
–.015
.018 ± .003
(0.457 ± 0.076)
.100
(2.54)
BSC
+0.889
8.255
(
)
N8 1002
–0.381
NOTE:
INCHES
1. DIMENSIONS ARE
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
.045 ±.005
NOTE 3
.050 BSC
7
5
8
6
.245
MIN
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 ±.005
TYP
1
3
4
2
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
(0.254 – 0.508)
× 45°
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
INCHES
1. DIMENSIONS IN
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
SO8 0303
1460fc
ꢀꢀ
LT1460
package Description
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660 Rev F)
0.889 ± 0.127
(.035 ± .005)
5.23
(.206)
MIN
3.20 – 3.45
(.126 – .136)
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
0.52
(.0205)
REF
0.65
(.0256)
BSC
0.42 ± 0.038
(.0165 ± .0015)
TYP
8
7 6 5
RECOMMENDED SOLDER PAD LAYOUT
3.00 ± 0.102
(.118 ± .004)
(NOTE 4)
4.90 ± 0.152
(.193 ± .006)
DETAIL “A”
0.254
(.010)
0° – 6° TYP
GAUGE PLANE
1
2
3
4
0.53 ± 0.152
(.021 ± .006)
1.10
(.043)
MAX
0.86
(.034)
REF
DETAIL “A”
0.18
(.007)
SEATING
PLANE
0.22 – 0.38
0.1016 ± 0.0508
(.009 – .015)
(.004 ± .002)
0.65
(.0256)
BSC
TYP
MSOP (MS8) 0307 REV F
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 (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
1460fc
ꢀꢁ
LT1460
package Description
Z Package
3-Lead Plastic TO-92 (Similar to TO-226)
(Reference LTC DWG # 05-08-1410 Rev C)
.060 p .005
.180 p .005
(4.572 p 0.127)
(1.524p 0.127)
DIA
.90
(2.286)
NOM
.180 p .005
(4.572 p 0.127)
5o
NOM
.500
(12.70)
MIN
.050
(1.270)
MAX
UNCONTROLLED
LEAD DIMENSION
.016 p .003
(0.406 p 0.076)
.015 p .002
(0.381 p 0.051)
Z3 (TO-92) 1008 REV C
.050
.098 +.016/–.04
(2.5 +0.4/–0.1)
2 PLCS
(1.27)
BSC
BULK PACK
TO-92 TAPE AND REEL
REFER TO TAPE AND REEL SECTION OF
LTC DATA BOOK FOR ADDITIONAL INFORMATION
.060 p .010
(1.524 p 0.254)
.140 p .010
(3.556 p 0.127)
3
2
1
10o NOM
1460fc
ꢀꢂ
LT1460
revision history (Revision history begins at Rev C)
REV
DATE
DESCRIPTION
PAGE NUMBER
C
3/10
2
Change θ on S3 Package from 325°C/W to 228°C/W
JA
1460fc
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 interconnection of its circuits as described herein will not infringe on existing patent rights.
ꢀꢃ
LT1460
typical applications
Handling Higher Load Currents
+
V
40mA
+
47µF
IN
R1*
LT1460
10mA
V
OUT
OUT
GND
TYPICAL LOAD
CURRENT = 50mA
R
L
*SELECT R1 TO DELIVER 80% OF TYPICAL LOAD CURRENT.
LT1460 WILL THEN SOURCE AS NECESSARY TO MAINTAIN
PROPER OUTPUT. DO NOT REMOVE LOAD AS OUTPUT WILL
BE DRIVEN UNREGULATED HIGH. LINE REGULATION IS
DEGRADED IN THIS APPLICATION
+
V
– V
OUT
R1 =
40mA
1460 TA03
Boosted Output Current with No Current Limit
Boosted Output Current with Current Limit
+
+
V
≥ (V
+ 1.8V)
V
≥ V
+ 2.8V
OUT
OUT
+
+
D1*
LED
R1
220Ω
R1
220Ω
47µF
47µF
8.2Ω
2N2905
2N2905
IN
IN
LT1460
LT1460
V
OUT
V
OUT
OUT
100mA
OUT
100mA
+
2µF
SOLID
TANT
GND
+
2µF
GND
SOLID
TANT
GLOWS IN CURRENT LIMIT,
DO NOT OMIT
*
1460 TA05
1460 TA04
relateD parts
PART NUMBER DESCRIPTION
COMMENTS
LT1019
LT1027
LT1236
LT1461
LT1634
LT1790
LTC®1798
LTC6652
LT6660
Precision Bandgap Reference
Precision 5V Reference
0.05% Max, 5ppm/°C Max
0.02%, 2ppm/°C Max
Precision Low Noise Reference
0.05% Max, 5ppm/°C Max, SO Package
Micropower Precision Low Dropout
0.04% Max, 3ppm/°C Max, 50mA Output Current
0.05%, 25ppm/°C Max
Micropower Precision Shunt Reference 1.25V, 2.5V Output
Micropower Precision Series References
0.05% Max, 10ppm/°C Max, 60µA Supply, SOT23 Package
0.15% Max, 40ppm/°C, 6.5µA Max Supply Current
Micropower Low Dropout Reference, Fixed or Adjustable
Low Drift Low Noise Buffered Reference
0.05% Accuracy, 5ppm/°C Drift, 2.1ppm (0.1Hz to 10Hz) Noise
Tiny Micropower Precision Series References
0.075% Max, 10ppm/°C Max, 20mA Output, 2mm × 2mm DFN Package
1460fc
LT 0310 REV C • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
ꢀꢄ
●
●
LINEAR TECHNOLOGY CORPORATION 2006
(408)432-1900 FAX: (408) 434-0507 www.linear.com
相关型号:
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