LM4050BEM3-10/NOPB [ROCHESTER]
1-OUTPUT TWO TERM VOLTAGE REFERENCE, 10V, PDSO3, 3 X 1.30 MM, PLASTIC, TO-236-AB, SOT-23, 3 PIN;
| 型号： | LM4050BEM3-10/NOPB |
| 厂家： | 
Rochester Electronics |
| 描述： | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 10V, PDSO3, 3 X 1.30 MM, PLASTIC, TO-236-AB, SOT-23, 3 PIN 光电二极管 输出元件 |
| 文件： | 总16页 (文件大小：962K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
July 2004
LM4050
Precision Micropower Shunt Voltage Reference
n Tolerates capacitive loads
n Fixed reverse breakdown voltages of 2.048V, 2.500V,
4.096V, 5.000V, 8.192V, and 10.000V
General Description
Ideal for space critical applications, the LM4050 precision
voltage reference is available in the sub-miniature (3 mm x
1.3 mm) SOT-23 surface-mount package. The LM4050’s de-
sign eliminates the need for an external stabilizing capacitor
while ensuring stability with any capacitive load, thus making
the LM4050 easy to use. Further reducing design effort is the
availability of several fixed reverse breakdown voltages:
2.048V, 2.500V, 4.096V, 5.000V, 8.192V, and 10.000V. The
minimum operating current increases from 60 µA for the
LM4050-2.0 to 100 µA for the LM4050-10.0. All versions
have a maximum operating current of 15 mA.
Key Specifications (LM4050-2.5)
j
Output voltage tolerance
(A grade, 25˚C)
0.1% (max)
j
Low output noise
(10 Hz to 10 kHz)
41 µVrms(typ)
60 µA to 15 mA
−40˚C to +85˚C
−40˚C to +125˚C
50 ppm/˚C (max)
j
j
j
j
Wide operating current range
Industrial temperature range
Extended temperature range
Low temperature coefficient
The LM4050 utilizes fuse and zener-zap reverse breakdown
voltage trim during wafer sort to ensure that the prime parts
have an accuracy of better than 0.1% (A grade) at 25˚C.
Bandgap reference temperature drift curvature correction
and low dynamic impedance ensure stable reverse break-
down voltage accuracy over a wide range of operating tem-
peratures and currents.
Applications
n Portable, Battery-Powered Equipment
n Data Acquisition Systems
n Instrumentation
All grades and voltage options of the LM4050 are available
in both an industrial temperature range (−40˚C and +85˚C)
and an extended temperature range (−40˚C and +125˚C).
n Process Control
n Energy Management
n Product Testing
n Automotive
Features
n Small packages: SOT-23
n No output capacitor required
n Precision Audio Components
Connection Diagram
SOT-23
10104501
*This pin must be left floating or connected to pin 2.
Top View
See NS Package Number MF03A
© 2004 National Semiconductor Corporation
DS101045
www.national.com
Ordering Information
Industrial Temperature Range (−40˚C to +85˚C)
Reverse Breakdown
Voltage Tolerance at 25˚C and Average
Reverse Breakdown
LM4050 Supplied as 1000 Units,
Tape and Reel
LM4050 Supplied as 3000 Units,
Tape and Reel
Voltage Temperature Coefficient
LM4050AIM3-2.0
LM4050AIM3-2.5
LM4050AIM3-4.1
LM4050AIM3-5.0
LM4050AIM3-8.2
LM4050AIM3-10
LM4050BIM3-2.0
LM4050BIM3-2.5
LM4050BIM3-4.1
LM4050BIM3-5.0
LM4050BIM3-8.2
LM4050BIM3-10
LM4050CIM3-2.0
LM4050CIM3-2.5
LM4050CIM3-4.1
LM4050CIM3-5.0
LM4050CIM3-8.2
LM4050CIM3-10
LM4050AIM3X-2.0
LM4050AIM3X-2.5
LM4050AIM3X-4.1
LM4050AIM3X-5.0
LM4050AIM3X-8.2
LM4050AIM3X-10
LM4050BIM3X-2.0
LM4050BIM3X-2.5
LM4050BIM3X-4.1
LM4050BIM3X-5.0
LM4050BIM3X-8.2
LM4050BIM3X-10
LM4050CIM3X-2.0
LM4050CIM3X-2.5
LM4050CIM3X-4.1
LM4050CIM3X-5.0
LM4050CIM3X-8.2
LM4050CIM3X-10
0.1%, 50 ppm/˚C max (A grade)
0.2%, 50 ppm/˚C max (B grade)
0.5%, 50 ppm/˚C max (C grade)
Extended Temperature Range (−40˚C to +125˚C)
Reverse Breakdown
Voltage Tolerance at 25˚C and Average
Reverse Breakdown
LM4050 Supplied as 1000 Units,
Tape and Reel
LM4050 Supplied as 3000 Units,
Tape and Reel
Voltage Temperature Coefficient
LM4050AEM3-2.0
LM4050AEM3-2.5
LM4050AEM3-4.1
LM4050AEM3-5.0
LM4050AEM3-8.2
LM4050AEM3-10
LM4050BEM3-2.0
LM4050BEM3-2.5
LM4050BEM3-4.1
LM4050BEM3-5.0
LM4050BEM3-8.2
LM4050BEM3-10
LM4050CEM3-2.0
LM4050CEM3-2.5
LM4050CEM3-4.1
LM4050CEM3-5.0
LM4050CEM3-8.2
LM4050CEM3-10
LM4050AEM3X-2.0
LM4050AEM3X-2.5
LM4050AEM3X-4.1
LM4050AEM3X-5.0
LM4050AEM3X-8.2
LM4050AEM3X-10
LM4050BEM3X-2.0
LM4050BEM3X-2.5
LM4050BEM3X-4.1
LM4050BEM3X-5.0
LM4050BEM3X-8.2
LM4050BEM3X-10
LM4050CEM3X-2.0
LM4050CEM3X-2.5
LM4050CEM3X-4.1
LM4050CEM3X-5.0
LM4050CEM3X-8.2
LM4050CEM3X-10
0.1%, 50 ppm/˚C max (A grade)
0.2%, 50 ppm/˚C max (B grade)
0.5%, 50 ppm/˚C max (C grade)
www.national.com
2
SOT-23 Package Marking Information
Only three fields of marking are possible on the SOT-23’s small surface. This table gives the meaning of the three fields.
Part Marking
RCA
RDA
REA
Field Definition
First Field:
R = Reference
Second Field:
RFA
N = 2.048V Voltage Option
C = 2.500V Voltage Option
D = 4.096V Voltage Option
E = 5.000V Voltage Option
F = 8.192V Voltage Option
G = 10.000V Voltage Option
RGA
RNA
RCB
RDB
REB
RFB
RGB
RNB
RCC
RDC
REC
RFC
Third Field:
A–C = Initial Reverse Breakdown Voltage or Reference Voltage Tolerance
A = 0.1%, B = 0.2%, C = +0.5%,
RGC
RNC
3
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Absolute Maximum Ratings (Note 1)
Operating Ratings (Note 2)
Temperature Range
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
(Tmin ≤ TA ≤ Tmax)
Industrial Temperature
Range
Extended temperature
−40˚C ≤ TA ≤ +85˚C
−40˚C ≤ TA ≤ +125˚C
Reverse Current
20 mA
10 mA
Forward Current
Range
Power Dissipation (TA = 25˚C) (Note 2)
M3 Package
Reverse Current
LM4050-2.0
LM4050-2.5
LM4050-4.1
LM4050-5.0
LM4050-8.2
LM4050-10.0
280 mW
60 µA to 15 mA
60 µA to 15 mA
68 µA to 15 mA
74 µA to 15 mA
91 µA to 15 mA
100 µA to 15 mA
Storage Temperature
Lead Temperature
−65˚C to +150˚C
M3 Package
Vapor phase (60 seconds)
Infrared (15 seconds)
ESD Susceptibility
+215˚C
+220˚C
Human Body Model (Note 3)
Machine Model (Note 3)
2 kV
200V
See AN-450 “Surface Mounting Methods and Their Effect
on Product Reliability” for other methods of soldering
surface mount devices.
LM4050-2.0
Electrical Characteristics
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25˚C. The grades A, B and C designate initial
Reverse Breakdown Voltage tolerances of 0.1%, 0.2%, and 0.5% respectively.
LM4050AIM3
LM4050BIM3
LM4050CIM3
Typical
(Note 4)
LM4050AEM3 LM4050BEM3 LM4050CEM3
Units
(Limit)
Symbol
VR
Parameter
Conditions
Limits
(Note 5)
Limits
(Note 5)
Limits
(Note 5)
Reverse Breakdown Voltage
IR = 100 µA
2.048
41
V
mV (max)
mV (max)
mV (max)
µA
Reverse Breakdown Voltage
Tolerance (Note 6)
IR = 100 µA
2.048
9.0112
12.288
4.096
10.24
Industrial Temp. Range
Extended Temp. Range
11.4688
14.7456
14.7456
17.2032
IRMIN
Minimum Operating Current
60
60
60
µA (max)
µA (max)
ppm/˚C
ppm/˚C
ppm/˚C (max)
mV
65
65
65
∆VR/∆T
∆VR/∆IR
Average Reverse Breakdown
Voltage Temperature
IR = 10 mA
20
15
IR = 1 mA
Coefficient (Note 6)
IR = 100 µA
IRMIN ≤ IR ≤ 1 mA
15
50
50
50
Reverse Breakdown Voltage
Change with Operating Current
Change (Note 7)
0.3
0.8
0.8
0.8
mV (max)
mV (max)
mV
1.2
1.2
1.2
1 mA ≤ IR ≤ 15 mA
2.3
6.0
6.0
6.0
mV (max)
mV (max)
Ω
8.0
8.0
8.0
ZR
Reverse Dynamic Impedance
Wideband Noise
IR = 1 mA, f = 120 Hz, IAC
= 0.1 IR
0.3
34
eN
IR = 100 µA
µVrms
10 Hz ≤ f ≤ 10 kHz
∆VR
Reverse Breakdown Voltage
Long Term Stability
t = 1000 hrs
T = 25˚C 0.1˚C
IR = 100 µA
120
0.7
ppm
mV
VHYST
Thermal Hysteresis
(Note 8)
∆T = −40˚C to 125˚C
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4
LM4050-2.5
Electrical Characteristics
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25˚C. The grades A, B and C designate initial
Reverse Breakdown Voltage tolerances of 0.1%, 0.2%, and 0.5% respectively.
LM4050AIM3 LM4050BIM3 LM4050CIM3
Typical
(Note 4)
LM4050AEM3 LM4050BEM3 LM4050CEM3
Units
(Limit)
Symbol
VR
Parameter
Conditions
Limits
Limits
(Note 5)
Limits
(Note 5)
(Note 5)
Reverse Breakdown Voltage
IR = 100 µA
2.500
41
V
mV (max)
mV (max)
mV (max)
µA
Reverse Breakdown Voltage
Tolerance (Note 6)
IR = 100 µA
2.5
11
15
5.0
14
18
13
21
25
Industrial Temp. Range
Extended Temp. Range
IRMIN
Minimum Operating Current
60
60
60
µA (max)
µA (max)
ppm/˚C
ppm/˚C
ppm/˚C (max)
mV
65
65
65
∆VR/∆T
∆VR/∆IR
Average Reverse Breakdown
Voltage Temperature Coefficient
(Note 6)
IR = 10 mA
20
15
IR = 1 mA
IR = 100 µA
IRMIN ≤ IR ≤ 1 mA
15
50
50
50
Reverse Breakdown Voltage
Change with Operating Current
Change (Note 7)
0.3
0.8
0.8
0.8
mV (max)
mV (max)
mV
1.2
1.2
1.2
1 mA ≤ IR ≤ 15 mA
2.3
6.0
6.0
6.0
mV (max)
mV (max)
Ω
8.0
8.0
8.0
ZR
Reverse Dynamic Impedance
Wideband Noise
IR = 1 mA, f = 120 Hz, IAC
= 0.1 IR
0.3
41
eN
IR = 100 µA
µVrms
10 Hz ≤ f ≤ 10 kHz
∆VR
Reverse Breakdown Voltage
Long Term Stability
t = 1000 hrs
T = 25˚C 0.1˚C
IR = 100 µA
120
0.7
ppm
mV
VHYST
Thermal Hysteresis
(Note 8)
∆T = −40˚C to 125˚C
LM4050-4.1
Electrical Characteristics
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25˚C. The grades A, B and C designate initial
Reverse Breakdown Voltage tolerances of 0.1%, 0.2%, and 0.5% respectively.
LM4050AIM3 LM4050BIM3 LM4050CIM3
Typical
(Note 4)
LM4050AEM3 LM4050BEM3 LM4050CEM3
Units
(Limit)
Symbol
VR
Parameter
Conditions
Limits
Limits
(Note 5)
Limits
(Note 5)
(Note 5)
Reverse Breakdown Voltage
IR = 100 µA
4.096
52
V
mV (max)
mV (max)
mV (max)
µA
Reverse Breakdown Voltage
Tolerance (Note 6)
IR = 100 µA
4.1
18
25
8.2
22
29
21
34
41
Industrial Temp. Range
Extended Temp. Range
IRMIN
Minimum Operating Current
68
73
78
68
73
78
68
73
78
µA (max)
µA (max)
µA (max)
ppm/˚C
Industrial Temp. Range
Extended Temp. Range
IR = 10 mA
∆VR/∆T
∆VR/∆IR
Average Reverse Breakdown
Voltage Temperature Coefficient
(Note 6)
30
20
IR = 1 mA
ppm/˚C
IR = 100 µA
20
50
50
50
ppm/˚C (max)
mV
Reverse Breakdown Voltage
Change with Operating Current
Change (Note 7)
IRMIN ≤ IR ≤ 1 mA
0.2
0.9
0.9
0.9
mV (max)
mV (max)
mV
1.2
1.2
1.2
1 mA ≤ IR ≤ 15 mA
2.0
7.0
7.0
7.0
mV (max)
mV (max)
10.0
10.0
10.0
5
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LM4050-4.1
Electrical Characteristics (Continued)
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25˚C. The grades A, B and C designate initial
Reverse Breakdown Voltage tolerances of 0.1%, 0.2%, and 0.5% respectively.
LM4050AIM3 LM4050BIM3 LM4050CIM3
Typical
(Note 4)
LM4050AEM3 LM4050BEM3 LM4050CEM3
Units
(Limit)
Symbol
ZR
Parameter
Conditions
Limits
Limits
(Note 5)
Limits
(Note 5)
(Note 5)
Reverse Dynamic Impedance
IR = 1 mA, f = 120 Hz,
IAC = 0.1 IR
0.5
93
Ω
eN
Wideband Noise
IR = 100 µA
µVrms
10 Hz ≤ f ≤ 10 kHz
∆VR
Reverse Breakdown Voltage
Long Term Stability
t = 1000 hrs
T = 25˚C 0.1˚C
IR = 100 µA
120
ppm
mV
VHYST
Thermal Hysteresis
(Note 8)
∆T = −40˚C to 125˚C
1.148
LM4050-5.0
Electrical Characteristics
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25˚C. The grades A, B and C designate initial
Reverse Breakdown Voltage tolerances of 0.1%, 0.2% and 0.5% respectively.
LM4050AIM3 LM4050BIM3 LM4050CIM3
Typical
(Note 4)
LM4050AEM3 LM4050BEM3 LM4050CEM3
Units
(Limit)
Symbol
VR
Parameter
Conditions
Limits
Limits
(Note 5)
Limits
(Note 5)
(Note 5)
Reverse Breakdown Voltage
IR = 100 µA
5.000
56
V
mV (max)
mV (max)
mV (max)
µA
Reverse Breakdown Voltage
Tolerance (Note 6)
IR = 100 µA
5.0
22
30
10
27
35
25
42
50
Industrial Temp. Range
Extended Temp. Range
IRMIN
Minimum Operating Current
74
80
90
74
80
90
74
80
90
µA (max)
µA (max)
µA (max)
ppm/˚C
ppm/˚C
ppm/˚C (max)
mV
Industrial Temp. Range
Extended Temp. Range
IR = 10 mA
∆VR/∆T
∆VR/∆IR
Average Reverse Breakdown
Voltage Temperature Coefficient
(Note 6)
30
20
IR = 1 mA
IR = 100 µA
20
50
50
50
Reverse Breakdown Voltage
Change with Operating Current
Change (Note 7)
IRMIN ≤ IR ≤ 1 mA
0.2
1.0
1.0
1.0
mV (max)
mV (max)
mV
1.4
1.4
1.4
1 mA ≤ IR ≤ 15 mA
2.0
8.0
8.0
8.0
mV (max)
mV (max)
Ω
12.0
12.0
12.0
ZR
Reverse Dynamic Impedance
Wideband Noise
IR = 1 mA, f = 120 Hz,
IAC = 0.1 IR
0.5
93
Ω (max)
µVrms
eN
IR = 100 µA
10 Hz ≤ f ≤ 10 kHz
t = 1000 hrs
∆VR
Reverse Breakdown Voltage
Long Term Stability
T = 25˚C 0.1˚C
IR = 100 µA
120
1.4
ppm
mV
VHYST
Thermal Hysteresis
(Note 8)
∆T = −40˚C to 125˚C
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6
LM4050-8.2
Electrical Characteristics
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25˚C. The grades A, B and C designate initial
Reverse Breakdown Voltage tolerances of 0.1% and 0.2% and 0.5% respectively.
LM4050AIM3 LM4050BIM3 LM4050CIM3
Typical
(Note 4)
LM4050AEM3 LM4050BEM3 LM4050CEM3
Units
(Limit)
Symbol
VR
Parameter
Conditions
Limits
Limits
(Note 5)
Limits
(Note 5)
(Note 5)
Reverse Breakdown Voltage
IR = 150 µA
8.192
74
V
mV (max)
mV (max)
mV (max)
µA
Reverse Breakdown Voltage
Tolerance (Note 6)
IR = 150 µA
8.2
35
49
16
43
57
41
68
82
Industrial Temp. Range
Extended Temp. Range
IRMIN
Minimum Operating Current
91
95
91
95
91
95
µA (max)
µA (max)
µA (max)
ppm/˚C
ppm/˚C
ppm/˚C (max)
mV
Industrial Temp. Range
Extended Temp. Range
IR = 10 mA
100
100
100
∆VR/∆T
∆VR/∆IR
Average Reverse Breakdown
Voltage Temperature Coefficient
(Note 6)
40
20
IR = 1 mA
IR = 150 µA
20
50
50
50
Reverse Breakdown Voltage
Change with Operating Current
Change (Note 7)
IRMIN ≤ IR ≤ 1 mA
0.6
1.3
1.3
1.3
mV (max)
mV (max)
mV
2.5
2.5
2.5
1 mA ≤ IR ≤ 15 mA
7.0
10.0
10.0
10.0
mV (max)
mV (max)
Ω
18.0
18.0
18.0
ZR
Reverse Dynamic Impedance
Wideband Noise
IR = 1 mA, f = 120 Hz,
IAC = 0.1 IR
0.6
eN
IR = 150 µA
150
µVrms
10 Hz ≤ f ≤ 10 kHz
t = 1000 hrs
∆VR
Reverse Breakdown Voltage
Long Term Stability
T = 25˚C 0.1˚C
IR = 150 µA
120
2.3
ppm
mV
VHYST
Thermal Hysteresis
(Note 8)
∆T = −40˚C to 125˚C
7
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LM4050-10.0
Electrical Characteristics
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25˚C. The grades A, B and C designate initial
Reverse Breakdown Voltage tolerances of 0.1% and 0.2% and 0.5% respectively.
Typical
LM4050AIM3 LM4050BIM3 LM4050CIM3
(Note 4) LM4050AEM3 LM4050BEM3 LM4050CEM3
Units
(Limit)
Symbol
VR
Parameter
Conditions
Limits
Limits
(Note 5)
Limits
(Note 5)
(Note 5)
Reverse Breakdown Voltage
IR = 150 µA
10.00
80
V
mV (max)
mV (max)
mV (max)
µA
Reverse Breakdown Voltage
Tolerance (Note 6)
IR = 150 µA
10
43
60
20
53
70
50
83
Industrial Temp. Range
Extended Temp. Range
100
IRMIN
Minimum Operating Current
100
103
110
100
103
110
100
103
110
µA (max)
µA (max)
µA (max)
ppm/˚C
ppm/˚C
ppm/˚C (max)
mV
Industrial Temp. Range
Extended Temp. Range
IR = 10 mA
∆VR/∆T
∆VR/∆IR
Average Reverse Breakdown
Voltage Temperature Coefficient
(Note 6)
40
20
IR = 1 mA
IR = 150 µA
20
50
50
50
Reverse Breakdown Voltage
Change with Operating Current
Change (Note 7)
IRMIN ≤ IR ≤ 1 mA
0.8
1.5
1.5
1.5
mV (max)
mV (max)
mV
3.5
3.5
3.5
1 mA ≤ IR ≤ 15 mA
8.0
12.0
12.0
12.0
mV (max)
mV (max)
Ω
23.0
23.0
23.0
ZR
Reverse Dynamic Impedance
Wideband Noise
IR = 1 mA, f = 120 Hz,
IAC = 0.1 IR
0.7
eN
IR = 150 µA
150
µVrms
10 Hz ≤ f ≤ 10 kHz
t = 1000 hrs
∆VR
Reverse Breakdown Voltage
Long Term Stability
T = 25˚C 0.1˚C
IR = 150 µA
120
2.8
ppm
mV
VHYST
Thermal Hysteresis
(Note 8)
∆T = −40˚C to 125˚C
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by T
(maximum junction temperature), θ (junction to
JA
Jmax
ambient thermal resistance), and T (ambient temperature). The maximum allowable power dissipation at any temperature is PD
= (T − T )/θ or the
Jmax A JA
A
max
number given in the Absolute Maximum Ratings, whichever is lower. For the LM4050, T
is 326˚C/W for the SOT-23 package.
= 125˚C, and the typical thermal resistance (θ ), when board mounted,
Jmax
JA
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged
directly into each pin.
Note 4: Typicals are at T = 25˚C and represent most likely parametric norm.
J
Note 5: Limits are 100% production tested at 25˚C. Limits over temperature are guaranteed through correlation using Statistical Quality Control (SQC) methods.
The limits are used to calculate National’s AOQL.
Note 6: The boldface (over-temperature) limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Voltage Tolerance
[(∆V /∆T)(max∆T)(V )]. Where, ∆V /∆T is the V temperature coefficient, max∆T is the maximum difference in temperature from the reference point of 25˚C to
R
R
R
R
T
or T
, and V is the reverse breakdown voltage. The total over-temperature tolerance for the different grades in the industrial temperature range where
MIN
MAX R
max∆T = 65˚C is shown below:
A-grade: 0.425% = 0.1% 50 ppm/˚C x 65˚C
B-grade: 0.525% = 0.2% 50 ppm/˚C x 65˚C
C-grade: 0.825% = 0.5% 50 ppm/˚C x 65˚C
Therefore, as an example, the A-grade LM4050-2.5 has an over-temperature Reverse Breakdown Voltage tolerance of 2.5V x 0.425% = 11 mV.
Note 7: Load regulation is measured on pulse basis from no load to the specified load current. Output changes due to die temperature change must be taken into
account separately.
Note 8: Thermal hysteresis is defined as the difference in voltage measured at +25˚C after cycling to temperature -40˚C and the 25˚C measurement after cycling
to temperature +125˚C.
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8
Typical Performance Characteristics
Output Impedance vs Frequency
Output Impedance vs Frequency
10104510
10104511
Reverse Characteristics and
Minimum Operating Current
Noise Voltage vs Frequency
10104512
10104513
Thermal Hysteresis
10104529
9
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Start-Up Characteristics
LM4050-10.0
RS = 30k
10104505
LM4050-2.5
RS = 30k
10104509
10104507
LM4050-5.0
RS = 30k
10104508
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10
Functional Block Diagram
10104514
temperature +125˚C and again measured at 25˚C. The re-
sulting VOUT delta shift between the 25˚C measurements is
thermal hysteresis. Thermal hysteresis is common in preci-
sion references and is induced by thermal-mechanical pack-
age stress. Changes in environmental storage temperature,
operating temperature and board mounting temperature are
all factors that can contribute to thermal hysteresis.
Applications Information
The LM4050 is a precision micro-power curvature-corrected
bandgap shunt voltage reference. For space critical applica-
tions, the LM4050 is available in the sub-miniature SOT-23
surface-mount package. The LM4050 has been designed for
stable operation without the need of an external capacitor
connected between the “+” pin and the “−” pin. If, however, a
bypass capacitor is used, the LM4050 remains stable. Re-
ducing design effort is the availability of several fixed reverse
breakdown voltages: 2.048V, 2.500V, 4.096V, 5.000V,
8.192V, and 10.000V. The minimum operating current in-
creases from 60 µA for the LM4050-2.0 to 100 µA for the
LM4050-10.0. All versions have a maximum operating cur-
rent of 15 mA.
In a conventional shunt regulator application (Figure 1) , an
external series resistor (RS) is connected between the sup-
ply voltage and the LM4050. RS determines the current that
flows through the load (IL) and the LM4050 (IQ). Since load
current and supply voltage may vary, RS should be small
enough to supply at least the maximum guaranteed IRMIN
(spec. table) to the LM4050 even when the supply voltage is
at its minimum and the load current is at its maximum value.
When the supply voltage is at its maximum and IL is at its
minimum, RS should be large enough so that the current
flowing through the LM4050 is less than 15 mA.
LM4050s in the SOT-23 packages have a parasitic Schottky
diode between pin 2 (−) and pin 3 (Die attach interface
contact). Therefore, pin 3 of the SOT-23 package must be
left floating or connected to pin 2.
RS is determined by the supply voltage, (VS), the load and
operating current, (IL and IQ), and the LM4050’s reverse
breakdown voltage, VR.
The 4.096V version allows single +5V 12-bit ADCs or DACs
to operate with an LSB equal to 1 mV. For 12-bit ADCs or
DACs that operate on supplies of 10V or greater, the 8.192V
version gives 2 mV per LSB.
The typical thermal hysteresis specification is defined as the
change in +25˚C voltage measured after thermal cycling.
The device is thermal cycled to temperature -40˚C and then
measured at 25˚C. Next the device is thermal cycled to
Typical Applications
10104515
FIGURE 1. Shunt Regulator
11
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Typical Applications (Continued)
10104516
*
* Ceramic monolithic
*Tantalum
FIGURE 2. LM4050-4.1’s Nominal 4.096 breakdown voltage gives ADC12451 1 mV/LSB
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12
Typical Applications (Continued)
10104517
FIGURE 3. Bounded amplifier reduces saturation-induced delays and can prevent succeeding stage damage.
Nominal clamping voltage is 11.5V (LM4050’s reverse breakdown voltage +2 diode VF).
10104518
FIGURE 4. Protecting Op Amp input. The bounding voltage is 4V with the LM4050-2.5
(LM4050’s reverse breakdown voltage + 3 diode VF).
13
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Typical Applications (Continued)
10104519
FIGURE 5. Precision 4.096V Reference
10104521
10104522
FIGURE 6. Precision 1 µA to 1 mA Current Sources
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14
Physical Dimensions inches (millimeters) unless otherwise noted
Plastic Surface Mount Package (M3)
NS Package Number MF03A
(JEDEC Registration TO-236AB)
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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
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National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products
Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification
(CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2.
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Support Center
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Europe Customer Support Center
Fax: +49 (0) 180-530 85 86
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Support Center
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Fax: 81-3-5639-7507
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National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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