LM4041DIM-ADJT&R [MICREL]
Two Terminal Voltage Reference, 1 Output, 1.233V, Trim/Adjustable, PDSO8, SOIC-8;
| 型号： | LM4041DIM-ADJT&R |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | Two Terminal Voltage Reference, 1 Output, 1.233V, Trim/Adjustable, PDSO8, SOIC-8 |
| 文件： | 总16页 (文件大小：815K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LM4040/4041
Precision Micropower Shunt Voltage Reference
General Description
Features
Ideal for space critical applications, the LM4040 and LM4041
precisionvoltagereferencesareavailableinthesubminiature
(3mm × 1.3mm) SOT-23 surface-mount package.
• Small SOT-23 package
• No output capacitor required
• Tolerates capacitive loads
• Fixed reverse breakdown voltages of 1.225, 2.500V,
4.096V and 5.000V
• Adjustable reverse breakdown version
• Contact Micrel for parts with extended temperature
range.
The LM4040 is the available in fixed reverse breakdown
voltages of 2.500V, 4.096V and 5.000V. The LM4041 is avail-
able with a fixed 1.225V or an adjustable reverse breakdown
voltage.
The minimum operating current ranges from 60µA for the
LM4041-1.2 to 74µA for the LM4040-5.0. LM4040 versions
have a maximum operating current of 15mA. LM4041 ver-
sions have a maximum operating current of 12mA.
Key Specifications
• Output voltage tolerance .............................±0.1% (max)
• Low output noise (10Hz to 100Hz)
The LM4040 and LM4041 have bandgap reference tempera-
ture drift curvature correction and low dynamic impedance,
ensuring stable reverse breakdown voltage accuracy over a
wide range of operating temperatures and currents.
LM4040................................................. 35µV
LM4041................................................. 20µV
• Wide operating current range
LM4040..................................................60µA to 15mA
LM4041..................................................60µA to 12mA
• Industrial temperature range .................. –40°C to +85°C
• Low temperature coefficient ................ 100ppm/°C (max)
(typ)
(typ)
RMS
RMS
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Applications
• Battery-powered equipment
• Data acquisition systems
• Instrumentation
• Process control
• Energy management
• Product testing
• Automotive electronics
• Precision audio components
Typical Applications
VS
VS
RS
VO
R1
IQ + IL
RS
IL
VO
VR
LM4041
VO = 1.233 (R2/R1 + 1)
Adjustable
R2
LM4040
LM4041
IQ
Figure 1. LM4040, LM4041 Fixed
Shunt Regulator Application
Figure 2. LM4041 Adjustable
Shunt Regulator Application
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
M9999-031805
March 2005
1
LM4040/4041
Micrel, Inc.
Pin Configuration
1
2
FB
+
3 –
3
Pin 3 must float or be
connected to pin 2.
Adjustable Version
SOT-23 (M3) Package
Fixed Version
SOT-23 (M3) Package
Ordering Information
Part Number
Accuracy,
Standard
Pb-Free
Voltage
Temp. Coefficient
LM4040CIM3-2.5
LM4040DIM3-2.5
LM4040CIM3-4.1
LM4040DIM3-4.1
LM4040CIM3-5.0
LM4040DIM3-5.0
LM4041CIM3-1.2
LM4041DIM3-1.2
LM4041CIM3-ADJ
LM4041DIM3-ADJ
LM4040CYM3-2.5
LM4040DYM3-2.5
LM4040CYM3-4.1
LM4040DYM3-4.1
LM4040CYM3-5.0
LM4040DYM3-5.0
LM4041CYM3-1.2
LM4041DYM3-1.2
LM4041CYM3-ADJ
LM4041DYM3-ADJ
2.500V
2.500V
±0.5%, 100ppm/°C
±1.0%, 150ppm/°C
±0.5%, 100ppm/°C
±1.0%, 150ppm/°C
±0.5%, 100ppm/°C
±1.0%, 150ppm/°C
±0.5%, 100ppm/°C
±1.0%, 150ppm/°C
±0.5%, 100ppm/°C
±1.0%, 150ppm/°C
4.096V
4.096V
5.000V
5.000V
1.225V
1.225V
1.24V to 10V
1.24V to 10V
SOT-23 Package Markings
Example
Field
Code
Example
_ 2 _
Field
Code
Example
_ _ C
Field
Code
R _ _
1st Character R = Reference
1st Character Y = Pb-Free
2nd Character 1 = 1.225V
2 = 2.500V
3rd Character C = ±0.5%
D = ±1.0%
Y _ _
4 = 4.096V
5 = 5.000V
A = Adjustable
X = ±0.5% Pb-Free
Y = ±1.0% Pb-Free
Example: R2C represents Reference, 2.500V,
±0.5% (LM4040CIM3-2.5)
Note: If 3rd character is omitted, container will
indicate tolerance.
Example: Y1C represents Pb-Free, 1.225V,
±0.5% (LM4040CYM3-1.2)
M9999-031805
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March 2005
LM4040/4041
Micrel, Inc.
+
+
VREF
FB
Functional Diagram
LM4040, LM4041 Fixed
Functional Diagram
LM4041 Adjustable
Absolute Maximum Ratings
Operating Ratings (Notes 1 and 2)
Reverse Current......................................................... 20mA
Temperature Range
(T
≤ T ≤ T
)............................–40°C ≤ T ≤ +85°C
Forward Current ......................................................... 10mA
MIN
A
MAX A
Reverse Current
Maximum Output Voltage
LM4040-2.5............................................60µA to 15mA
LM4040-4.1............................................68µA to 15mA
LM4040-5.0............................................74µA to 15mA
LM4041-1.2............................................60µA to 12mA
LM4041-ADJ..........................................60µA to 12mA
LM4041-Adjustable....................................................15V
Power Dissipation at T = 25°C (Note 2) ................306mW
A
Storage Temperature................................ –65°C to +150°C
Lead Temperature
Vapor phase (60 seconds)............................... +215°C
Infrared (15 seconds)....................................... +220°C
ESD Susceptibility
Output Voltage Range
LM4041-ADJ............................................1.24V to 10V
Human Body Model (Note 3) ............................... 2kV
Machine Model (Note 3) ....................................200V
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 specification 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 TJMAX (maximum junction temperature), θJA
(junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PD-
MAX = (TJMAX – TA)/θJA or the number given in the Absolute Maximum Ratings, whichever is lower. For the LM4040 and LM4041,
TJMAX = 125°C, and the typical thermal resistance (θJA), when board mounted, is 326°C/W for the SOT-23 package.
Note 3. The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. The machine model is a 200pF capacitor
discharged directly into each pin.
March 2005
3
M9999-031805
LM4040/4041
Micrel, Inc.
LM4040-2.5 Electrical Characteristics (Note 4)
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C. The grades C and D designate initial Reverse Break-
down Voltage tolerance of ±0.5% and ±1.0 respectively.
LM4040CIM3
(Note 6)
LM4040DIM3
Symbol Parameter
Conditions
(Note 5)
Typical
Limits
Units
Limits
(Limit)
(Note 6)
V
Reverse Breakdown Voltage
I
I
= 100µA
= 100µA
2.500
45
V
R
R
Reverse Breakdown Voltage
Tolerance (Note 7)
±12
±29
±25
±49
mV (max)
mV (max)
R
I
Minimum Operating Current
µA
RMIN
60
65
65
70
µA (max)
µA (max)
ΔV /ΔT
Average Reverse Breakdown
Voltage Temperature
Coefficient
I
I
I
= 10mA
= 1mA
= 100µA
±20
±15
±15
ppm/°C
ppm/°C (max)
ppm/°C (max)
R
R
R
R
±100
±150
ΔV /ΔI
Reverse Breakdown Voltage
Change with Operating
Current Change
I
≤ I 1mA
0.3
2.5
0.3
mV
mV (max)
mV (max)
R
R
RMIN
R
0.8
1.0
1.0
1.2
1mA ≤ I 15mA
mV
mV (max)
mV (max)
R
6.0
8.0
8.0
10.0
Z
e
Reverse Dynamic Impedance
Wideband Noise
I
I
= 1mA, f = 120Hz
= 0.1 I
Ω
R
R
0.9
1.1
Ω (max)
AC
R
I
= 100µA
N
R
10Hz ≤ f ≤ 10kHz
35
µV
RMS
ΔV
Reverse Breakdown Voltage
Long Term Stability
t = 1000hrs
T = 25°C ±0.1°C
R
120
ppm
I
= 100µA
R
Note 4. Specification for packaged product only.
Note 5. Typicals are at TJ = 25°C and represent most likely parametric norm.
Note 6. Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through correlation using Statistical Quality Control (SQL)
methods.
Note 7. The boldface (over temperature limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Volt-
age Tolerance ±[(ΔVR/ΔT)(65°C)(VR)]. ΔVR/ΔT is the VR temperature coefficient, 65°C is the temperature range from –40°C to the reference
point of 25°C, and VR is the reverse breakdown voltage. The total over temperature tolerance for the different grades follows:
C-grade: ±1.15% = ±0.5% ±100ppm/°C × 65°C
D-grade: ±1.98% = ±1.0% ±150ppm/°C × 65°C
Example: The C-grade LM4040-2.5 has an over temperature Reverse Breakdown Voltage tolerance of ±2.5 × 1.15% = ±29mV.
M9999-031805
4
March 2005
LM4040/4041
Micrel, Inc.
LM4040-4.1 Electrical Characteristics (Note 4)
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C. The grades C and D designate initial Reverse Break-
down Voltage tolerance of ±0.5% and ± 1.0% respectively.
LM4040CIM3
LM4040DIM3
Limits
Symbol Parameter
Conditions
Typical
(Note 5)
(Note 6)
Units
(Limits)
Limits
(Note 6)
V
I
Reverse Breakdown Voltage
I
I
= 100µA
= 100µA
4.096
V
R
R
Reverse Breakdown Voltage
Tolerance (Note 7)
±20
±47
±41
±81
mV (max)
mV (max)
R
Minimum Operating Current
50
µA
RMIN
68
73
73
78
µA (max)
µA (max)
ΔV /ΔT
Average Reverse Breakdown
Voltage Temperature
Coefficient
I
I
I
= 10mA
= 1mA
= 100µA
±30
±20
±20
ppm/°C
ppm/°C (max)
ppm/°C (max)
R
R
R
R
±100
±150
ΔV /ΔI
Reverse Breakdown Voltage
Change with Operating
Current Change
I
≤ I 1mA
0.5
3.0
0.5
mV
mV (max)
mV (max)
R
R
RMIN
R
0.9
1.2
1.2
1.5
1mA ≤ I 15mA
mV
mV (max)
mV (max)
R
7.0
10.0
9.0
13.0
Z
e
Reverse Dynamic Impedance
Wideband Noise
I
I
= 1mA, f = 120Hz
= 0.1 I
Ω
R
R
1.0
1.3
Ω (max)
AC
R
I
= 100µA
N
R
10Hz ≤ f ≤ 10kHz
80
µV
RMS
ΔV
Reverse Breakdown Voltage
Long Term Stability
t = 1000hrs
T = 25°C ±0.1°C
R
120
ppm
I
= 100µA
R
Note 4. Specification for packaged product only.
Note 5. Typicals are at TJ = 25°C and represent most likely parametric norm.
Note 6. Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through correlation using Statistical Quality Control (SQL)
methods.
Note 7. The boldface (over temperature limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Volt-
age Tolerance ±[(ΔVR/ΔT)(65°C)(VR)]. ΔVR/ΔT is the VR temperature coefficient, 65°C is the temperature range from –40°C to the reference
point of 25°C, and VR is the reverse breakdown voltage. The total over temperature tolerance for the different grades follows:
C-grade: ±1.15% = ±0.5% ±100ppm/°C × 65°C
D-grade: ±1.98% = ±1.0% ±150ppm/°C × 65°C
Example: The C-grade LM4040-2.5 has an over temperature Reverse Breakdown Voltage tolerance of ±2.5 × 1.15% = ±29mV.
March 2005
5
M9999-031805
LM4040/4041
Micrel, Inc.
LM4040-5.0 Electrical Characteristics (Note 4)
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C. The grades C and D designate initial Reverse Break-
down Voltage tolerance of ±0.5% and ± 1.0% respectively.
LM4040CIM3
LM4040DIM3
Limits
Symbol Parameter
Conditions
Typical
(Note 5)
(Note 6)
Units
(Limits)
Limits
(Note 6)
V
Reverse Breakdown Voltage
I
I
= 100µA
= 100µA
5.000
V
R
R
Reverse Breakdown Voltage
Tolerance (Note 7)
±25
±58
±50
±99
mV (max)
mV (max)
R
I
Minimum Operating Current
54
µA
RMIN
74
80
79
85
µA (max)
µA (max)
ΔV /ΔT
Average Reverse Breakdown
Voltage Temperature
Coefficient
I
I
I
= 10mA
= 1mA
= 100µA
±30
±20
±20
ppm/°C
ppm/°C (max)
ppm/°C (max)
R
R
R
R
±100
±150
ΔV /ΔI
Reverse Breakdown Voltage
Change with Operating
Current Change
I
≤ I 1mA
0.5
3.5
0.5
mV
mV (max)
mV (max)
R
R
RMIN
R
1.0
1.4
1.3
1.8
1mA ≤ I 15mA
mV
mV (max)
mV (max)
R
8.0
12.0
10.0
15.0
Z
e
Reverse Dynamic Impedance
Wideband Noise
I
I
= 1mA, f = 120Hz
= 0.1 I
Ω
R
R
1.1
1.5
Ω (max)
AC
R
I
= 100µA
N
R
10Hz ≤ f ≤ 10kHz
80
µV
RMS
ΔV
Reverse Breakdown Voltage
Long Term Stability
t = 1000hrs
T = 25°C ±0.1°C
R
120
ppm
I
= 100µA
R
Note 4. Specification for packaged product only.
Note 5. Typicals are at TJ = 25°C and represent most likely parametric norm.
Note 6. Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through correlation using Statistical Quality Control (SQL)
methods.
Note 7. The boldface (over temperature limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Volt-
age Tolerance ±[(ΔVR/ΔT)(65°C)(VR)]. ΔVR/ΔT is the VR temperature coefficient, 65°C is the temperature range from –40°C to the reference
point of 25°C, and VR is the reverse breakdown voltage. The total over temperature tolerance for the different grades follows:
C-grade: ±1.15% = ±0.5% ±100ppm/°C × 65°C
D-grade: ±1.98% = ±1.0% ±150ppm/°C × 65°C
Example: The C-grade LM4040-2.5 has an over temperature Reverse Breakdown Voltage tolerance of ±2.5 × 1.15% = ±29mV.
M9999-031805
6
March 2005
LM4040/4041
Micrel, Inc.
LM4040 Typical Characteristics
RS
VIN
VR
LM4040
1Hz rate
Test Circuit
March 2005
7
M9999-031805
LM4040/4041
Micrel, Inc.
LM4041-1.2 Electrical Characteristics (Note 4)
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C. The grades C and D designate initial Reverse Break-
down Voltage tolerance of ±0.5% and ± 1.0%, respectively.
LM4041CIM3
Symbol Parameter
Conditions
(Note 5)
Typical
Units
Limits
(Limit)
(Note 6)
V
Reverse Breakdown Voltage
I
I
= 100µA
= 100µA
1.225
V
R
R
Reverse Breakdown Voltage
Tolerance (Note 7)
±6
±14
mV (max)
mV (max)
R
I
Minimum Operating Current
45
µA
RMIN
60
65
µA (max)
µA (max)
ΔV /ΔT
Average Reverse Breakdown
Voltage Temperature
Coefficient
I
I
I
= 10mA
= 1mA
= 100µA
±20
±15
±15
ppm/°C
ppm/°C (max)
ppm/°C (max)
R
R
R
R
±100
ΔV /ΔI
Reverse Breakdown Voltage
Change with Operating
Current Change
I
≤ I 1mA
0.7
4.0
0.5
mV
mV (max)
mV (max)
R
R
RMIN
R
1.5
2.0
1mA ≤ I 15mA
mV
mV (max)
mV (max)
R
6.0
8.0
Z
e
Reverse Dynamic Impedance
Wideband Noise
I
I
= 1mA, f = 120Hz
= 0.1 I
Ω
R
R
1.5
Ω (max)
AC
R
I
= 100µA
N
R
10Hz ≤ f ≤ 10kHz
20
µV
RMS
ΔV
Reverse Breakdown Voltage
Long Term Stability
t = 1000hrs
T = 25°C ±0.1°C
R
120
ppm
I
= 100µA
R
Note 4. Specification for packaged product only.
Note 5. Typicals are at TJ = 25°C and represent most likely parametric norm.
Note 6. Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through correlation using Statistical Quality Control (SQL)
methods.
Note 7. The boldface (over temperature limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Volt-
age Tolerance ±[(ΔVR/ΔT)(65°C)(VR)]. ΔVR/ΔT is the VR temperature coefficient, 65°C is the temperature range from –40°C to the reference
point of 25°C, and VR is the reverse breakdown voltage. The total over temperature tolerance for the different grades follows:
C-grade: ±1.15% = ±0.5% ±100ppm/°C × 65°C
D-grade: ±1.98% = ±1.0% ±150ppm/°C × 65°C
Example: The C-grade LM4040-2.5 has an over temperature Reverse Breakdown Voltage tolerance of ±2.5 × 1.15% = ±29mV.
M9999-031805
8
March 2005
LM4040/4041
Micrel, Inc.
LM4041-1.2 Electrical Characteristics (Note 4)
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C. The grades C and D designate initial Reverse Break-
down Voltage tolerance of ±0.5% and ± 1.0%, respectively.
LM4041DIM3
Typical
Limits
Units
Symbol Parameter
Conditions
(Note 5)
(Note 6)
(Limit)
V
Reverse Breakdown Voltage
I
I
= 100µA
= 100µA
1.225
V
R
R
Reverse Breakdown Voltage
Tolerance (Note 7)
±12
±24
mV (max)
mV (max)
R
I
Minimum Operating Current
45
µA
RMIN
65
70
µA (max)
µA (max)
ΔV /ΔT
Average Reverse Breakdown
Voltage Temperature
Coefficient
I
I
I
= 10mA
= 1mA
= 100µA
±20
±15
±15
ppm/°C
ppm/°C (max)
ppm/°C (max)
R
R
R
R
±150
ΔV /ΔI
Reverse Breakdown Voltage
Change with Operating
Current Change
I
≤ I 1mA
0.7
2.5
0.5
mV
mV (max)
mV (max)
R
R
RMIN
R
2.0
2.5
1mA ≤ I 15mA
mV
mV (max)
mV (max)
R
8.0
10.0
Z
e
Reverse Dynamic Impedance
Wideband Noise
I
I
= 1mA, f = 120Hz
= 0.1 I
Ω
R
R
2.0
Ω (max)
AC
R
I
= 100µA
N
R
10Hz ≤ f ≤ 10kHz
20
µV
RMS
ΔV
Reverse Breakdown Voltage
Long Term Stability
t = 1000hrs
T = 25°C ±0.1°C
R
120
ppm
I
= 100µA
R
Note 4. Specification for packaged product only.
Note 5. Typicals are at TJ = 25°C and represent most likely parametric norm.
Note 6. Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through correlation using Statistical Quality Control (SQL)
methods.
Note 7. The boldface (over temperature limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Volt-
age Tolerance ±[(ΔVR/ΔT)(65°C)(VR)]. ΔVR/ΔT is the VR temperature coefficient, 65°C is the temperature range from –40°C to the reference
point of 25°C, and VR is the reverse breakdown voltage. The total over temperature tolerance for the different grades follows:
C-grade: ±1.15% = ±0.5% ±100ppm/°C × 65°C
D-grade: ±1.98% = ±1.0% ±150ppm/°C × 65°C
Example: The C-grade LM4040-2.5 has an over temperature Reverse Breakdown Voltage tolerance of ±2.5 × 1.15% = ±29mV.
March 2005
9
M9999-031805
LM4040/4041
Micrel, Inc.
LM4041-Adjustable Electrical Characteristics (Note 4)
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TJ = 25°C unless otherwise specified (SOT-23, see Note 8),
IRMIN ≤ IR < 12mA, VREF ≤ VOUT ≤ 10V. The grades C and D designate initial Reverse Breakdown Voltage tolerance of ±0.5% and ±1%,
respectively for VOUT = 5V.
LM4041CIM3
LM4041DIM3
Symbol Parameter
Conditions
(Note 5)
Typical
Limits
Units
Limits
(Limit)
(Note 6)
(Note 6)
V
Reference Breakdown Voltage
I
V
= 100µA
= 5V
1.233
V
REF
R
OUT
Reference Breakdown Voltage
Tolerance (Note 9)
I
= 100µA
±6.2
±14
±12
±24
mV (max)
mV (max)
R
I
Minimum Operating Current
45
µA
RMIN
60
65
65
70
µA (max)
µA (max)
ΔV
Reference Voltage
Change with Operating
Current Change
I
≤ I 1mA
0.7
mV
mV (max)
mV (max)
REF
RMIN
R
/ΔI
SOT-23:
≥ 1.6V
1.5
2.0
2.0
2.5
R
V
OUT
(Note 8)
1mA ≤ I 15mA
2
mV
R
SOT-23:
4
6
6
8
mV (max)
mV (max)
V
≥ 1.6V
OUT
(Note 8)
ΔV
/ΔV
Reference Voltage Change
with Output Voltage Change
I
= 1mA
R
–1.55
60
mV/V
mV/V (max)
mV/V (max)
REF
–2.0
–2.5
–2.5
–3.0
O
I
Feedback Current
nA
FB
100
120
150
200
nA (max)
nA (max)
ΔV
/ΔT
Average Reference
Voltage Temperature
Coefficient
V
I
= 5V
= 10mA
= 1mA
REF
OUT
±20
±15
±15
ppm/°C
ppm/°C (max)
ppm/°C (max)
R
I
±100
±150
R
(Note 9)
I
= 100µA
R
Z
Dynamic Output Impedance
I
I
= 1mA, f = 120Hz
= 0.1 I
OUT
R
AC
R
V
V
= V
= 10V
0.3
2
Ω
OUT
OUT
REF
Ω (max)
e
Wideband Noise
I
= 100µA
N
R
10Hz ≤ f ≤ 10kHz
20
µV
RMS
ΔV
Reference Voltage
Long Term Stability
t = 1000hrs
T = 25°C ±0.1°C
REF
120
ppm
I
= 100µA
R
Note 4. Specification for packaged product only.
Note 5. Typicals are at TJ = 25°C and represent most likely parametric norm.
Note 6. Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through correlation using Statistical Quality Control (SQL)
methods.
Note 7. The boldface (over temperature limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Volt-
age Tolerance ±[(ΔVR/ΔT)(65°C)(VR)]. ΔVR/ΔT is the VR temperature coefficient, 65°C is the temperature range from –40°C to the reference
point of 25°C, and VR is the reverse breakdown voltage. The total over temperature tolerance for the different grades follows:
C-grade: ±1.15% = ±0.5% ±100ppm/°C × 65°C
D-grade: ±1.98% = ±1.0% ±150ppm/°C × 65°C
Example: The C-grade LM4040-2.5 has an over temperature Reverse Breakdown Voltage tolerance of ±2.5 × 1.15% = ±29mV.
Note 8. When VOUT ≤ 1.6V, the LM4041-ADJ must operate at reduced IR. This is caused by the series resistance of the die attach between the die (–)
output and the package (–) output pin. See the Output Saturation curve in the “Typical Performance Characteristics” section.
Note 9. Reference voltage and temperature coefficient will change with output voltage. See “Typical Performance Characteristics” curves.
M9999-031805
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LM4040/4041
Micrel, Inc.
LM4041 Typical Characteristics
RS 30k
VIN
1Hz rate
V
R
LM4041-1.2
Test Circuit
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M9999-031805
LM4040/4041
Micrel, Inc.
LM4041 Typical Characteristics
IR
( + )
FB
VOUT
LM4041-ADJ
( – )
2V / step
V
†
Reverse Characteristics
Test Circuit
IR
+
–
120k
FB
CL
* Output Impedance vs. Freq.
Test Circuit
+ 15V
5.1k
( + )
LM4041-ADJ
( – )
INPUT
100k
FB
* Output impedance measurement..
VOUT
†
Reverse characteristics measurement.
‡
Large signal response measurement.
‡
Large Signal Response
Test Circuit
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LM4040/4041
Micrel, Inc.
Adjustable Regulator
Applications Information
The LM4041-ADJ’s output voltage can be adjusted to any
value in the range of 1.24V through 10V. It is a function of
The stable operation of the LM4040 and LM4041 references
requires an external capacitor greater than 10nF connected
between the (+) and (–) pins. Bypass capacitors with values
between 100pF and 10nF have been found to cause the
devices to exhibit instabilities.
the internal reference voltage (V
) and the ratio of the ex-
REF
ternal feedback resistors as shown in Figure 2. The output
is found using the equation:
(1)
V = V
[ (R2/R1) + 1 ]
Schottky Diode
O
REF
where V is the desired output voltage. The actual value of
LM4040-x.x and LM4041-1.2 in the SOT-23 package have
a parasitic Schottky diode between pin 2 (–) and pin 3 (die
attach interface connect). Pin 3 of the SOT-23 package must
float or be connected to pin 2. LM4041-ADJs use pin 3 as
the (–) output.
O
the internal V
is a function of V . The “corrected” V
O REF
REF
is determined by:
(2)
where V is the desired output voltage. ΔV
V
´ = V (ΔV
/ ΔV ) + V
REF
O
REF O Y
/ΔV is found
O
REF
O
Conventional Shunt Regulator
inthe“ElectricalCharacteristics”andistypically–1.3mV/Vand
V is equal to 1.233V. Replace the value of V in equation
In a conventional shunt regulator application (see Figure 1),
Y
REF
(1) with the value V
found using equation (2).
an external series resistor (R ) is connected between the
REF
S
supplyvoltageandtheLM4040-x.xorLM4041-1.2reference.
R determines the current that flows through the load (I )
Note that actual output voltage can deviate from that pre-
dicted using the typical ΔV
/ ΔV in equation (2); for C-
S
L
REF
O
and the reference (I ). Since load current and supply volt-
grade parts, the worst-case ΔV
/ ΔV is –2.5mV/V and
Q
REF
O
age may vary, R should be small enough to supply at least
V = 1.248V.
S
Y
the minimum acceptable I to the reference even when the
Q
The following example shows the difference in output volt-
age resulting from the typical and worst case values of
supply voltage is at its minimum and the load current is at
its maximum value. When the supply voltage is at its maxi-
mum and I is at its minimum, R should be large enough so
ΔV
/ ΔV .
REF
O
L
S
Let V = +9V. Using the typical values ofΔV
/ΔV , V
O REF
O
REF
that the current flowing through the LM4040-x.x is less than
15mA, and the current flowing through the LM4041-1.2 or
LM4041-ADJ is less than 12mA.
is 1.223V. Choosing a value of R1 = 10kΩ, R2 = 63.272kΩ.
Using the worst case ΔV / ΔV for the C-grade and D-
REF
O
grade parts, the output voltage is actually 8.965V and 8.946V
respectively. This results in possible errors as large as
0.39% for the C-grade parts and 0.59% for the D-grade parts.
Once again, resistor values found using the typical value of
R is determined by the supply voltage (V ), the load and
S
S
operating current, (I and I ), and the reference’s reverse
L
Q
breakdown voltage (V ):
R
R = (V – V ) / (I + I )
ΔV
/ ΔV will work in most cases, requiring no further
s
s
R
L
Q
REF
O
adjustment.
Typical Application Circuits
R1
R1
120k
+
–
+
λ
FB 120k
FB
D1
LM4041-ADJ
D1
LM4041-
ADJ
R2
1M
R2
1M
–
λ
> –12V
LED ON
< –12V
LED ON
R3
200
R3
330
–5V
–5V
Figure 3. Voltage Level Detector
Figure 4. Voltage Level Detector
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M9999-031805
LM4040/4041
Micrel, Inc.
VIN
R1
I
VOUT
D1
1N914
R2
VIN
R1
50A
I
D2
1N914
VOUT
R2
510k
D2
1N457
LM4041-ADJ
R3
240k
+
+
–
–
+
FB
FB
FB
LM4041-ADJ
LM4041-ADJ
–
R4
240k
R3
510k
D1
1N457
Figure 5. Fast Positive Clamp
Figure 6. Bidirectional Clamp
±2.4V
2.4V + ∆V
D1
VIN
VIN
I
R1
I
R1
VOUT
D2
1N457
VOUT
D2
R2
330k
R2
390k
1N457
+
–
–
+
FB
FB
LM4041-ADJ
LM4041-ADJ
R3
R3
1M
500k
+
–
–
+
FB
FB
LM4041-ADJ
LM4041-ADJ
R4
390k
D1
1N457
R4
330k
D1
1N457
Figure 7. Bidirectional Adjustable Clamp
±18V to ±2.4V
Figure 8. Bidirectional Adjustable Clamp
±2.4 to ±6V
0 to 20mA
+ 5V
R1
390Ω
± 2%
+
–
1N4002
D2
LM4041-ADJ
FB
R2
470k
D1*
1
2
3
6
λ
N.C.
5
4
CMOS
N.C.
5A
4N28
1.24V
R1 4N28 GAIN
ITHRESHOLD
=
+
= 3.2mA
* D1 can be any LED, VF = 1.5V to 2.2V at 3mA. D1 may act as an indicator.
D1 will be on if ITHRESHOLD falls below the threshold current, except with I = O.
Figure 9. Floating Current Detector
M9999-031805
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LM4040/4041
Micrel, Inc.
+15V
R1
+
–
FB
LM4041-ADJ
2N2905
2N
3964
R2
120k
1A < IOUT = 100mA
1.24V
IOUT
=
R1
Figure 10. Current Source
0 to 20 mA
+5V
R1
332Ω
±1%
+
LM4041-ADJ
–
FB
1N914
D2
1N4002
R3
100k
2N2222
R2
22k
1
2
3
6
D1*
5
4
λ
CMOS
R4
10M
N.C.
= 3.7mA ± 2%
4N28
1.24V
R1
ITHRESHOLD
=
* D1 can be any LED, VF = 1.5V to 2.2V at 3mA. D1 may act as an indicator.
D1 will be on if ITHRESHOLD falls below the threshold current, except with I = O.
Figure 11. Precision Floating Current Detector
March 2005
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M9999-031805
LM4040/4041
Micrel, Inc.
Package Information
SOT-23 (M3)
MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's
use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2004 Micrel Incorporated
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