LM4050BIM3-4.1+ [MAXIM]
Two Terminal Voltage Reference, 1 Output, 4.096V, BICMOS, PDSO3, LEAD FREE, SOT-23, 3 PIN;
| 型号： | LM4050BIM3-4.1+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Two Terminal Voltage Reference, 1 Output, 4.096V, BICMOS, PDSO3, LEAD FREE, SOT-23, 3 PIN 信息通信管理 光电二极管 |
| 文件： | 总13页 (文件大小：241K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2563; Rev 4; 5/09
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
General Description
Features
♦ 50ppm/°C (max) Temperature Coefficient
The LM4050/LM4051 are precision two-terminal, shunt-
mode, bandgap voltage references available in fixed
reverse breakdown voltages of 1.225V, 2.048V, 2.500V,
3.000V, 3.3V, 4.096V, and 5.000V. Ideal for space-criti-
cal applications, the LM4050/LM4051 are offered in the
subminiature 3-pin SC70 surface-mount packages
(1.8mm x 1.8mm), 50% smaller than comparable
devices in SOT23 surface-mount package (SOT23 ver-
sions are also available).
Guaranteed over the -40°C to +125°C
Temperature Range
♦ Ultra-Small 3-Pin SC70 Package
♦ 0.1% (max) Initial Accuracy
♦ Wide Operating Current Range: 60µA to 15mA
♦ Low 28µV
Output Noise (10Hz to 10kHz)
RMS
Laser-trimmed resistors ensure excellent initial
accuracy. With a 50ppm/°C temperature coefficient,
these devices are offered in three grades of initial accu-
racy ranging from 0.1% to 0.5%. The LM4050/LM4051
have a 60µA to 15mA shunt-current capability with low
dynamic impedance, ensuring stable reverse break-
down voltage accuracy over a wide range of operating
temperatures and currents. The LM4050/LM4051 do
not require an external stabilizing capacitor while
ensuring stability with any capacitive loads.
♦ 1.225V, 2.048V, 2.500V, 3.000V, 3.3V, 4.096V, and
5.000V Fixed Reverse Breakdown Voltages
♦ No Output Capacitors Required
♦ Tolerates Capacitive Loads
Selector Guide
OUTPUT
VOLTAGE
(V)
PIN-
PACKAGE
PART
TEMP RANGE
The LM4050/LM4051 specifications are guaranteed
over the temperature range of -40°C to +125°C.
LM4050_EM3-2.1+T -40°C to +125°C 3 SOT23-3
LM4050_EX3-2.1+T -40°C to +125°C 3 SC70-3
LM4050_EM3-2.5+T -40°C to +125°C 3 SOT23-3
LM4050_EX3-2.5+T -40°C to +125°C 3 SC70-3
LM4050_EM3-3.0+T -40°C to +125°C 3 SOT23-3
LM4050_EX3-3.0+T -40°C to +125°C 3 SC70-3
LM4050_EX3-3.3+T -40°C to +125°C 3 SC70-3
LM4050_EM3-4.1+T -40°C to +125°C 3 SOT23-3
LM4050_EX3-4.1+T -40°C to +125°C 3 SC70-3
LM4050_EM3-5.0+T -40°C to +125°C 3 SOT23-3
LM4050_EX3-5.0+T -40°C to +125°C 3 SC70-3
LM4051_EM3-1.2+T -40°C to +125°C 3 SOT23-3
LM4051_EX3-1.2+T -40°C to +125°C 3 SC70-3
2.048
2.048
2.500
2.500
3.000
3.000
3.300
4.096
4.096
5.000
5.000
1.225
1.225
________________________Applications
Portable, Battery-Powered Equipment
Notebook Computers
Cell Phones
Industrial Process Controls
Typical Operating Circuit
+Denotes a lead(pb)-free/RoHS-compliant package.
T = Tape and reel.
Ordering Information appears at end of data sheet.
V
S
Pin Configuration
I
+ I
SHUNT LOAD
R
S
TOP VIEW
I
LOAD
V
R
+
1
2
3
N.C.*
I
SHUNT
LM4050/
LM4051
-
LM4050
SC70/SOT23
*PIN 3 MUST BE LEFT FLOATING
OR CONNECTED TO PIN 2.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
ABSOLUTE MAXIMUM RATINGS
Reverse Current (cathode to anode) ..................................20mA
Forward Current (anode to cathode) ..................................10mA
Operating Temperature Range
LM4050/LM4051_E_ _ _ ................................-40°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s)..................................+300°C
Continuous Power Dissipation (T = +70°C)
A
3-Pin SC70 (derate 2.17mW/°C above +70°C)............174mW
3-Pin SOT23 (derate 4.01mW/°C above +70°C)..........320mW
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS—1.225V
(I = 100µA, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
MAX A
R
A
MIN
PARAMETER
SYMBOL
CONDITIONS
LM4051A (0.1%)
MIN
TYP
MAX
UNITS
1.2238 1.2250 1.2262
1.2226 1.2250 1.2275
1.2189 1.2250 1.2311
Reverse Breakdown Voltage
V
R
T
A
= +25°C
V
LM4051B (0.2%)
LM4051C (0.5%)
LM4051A
LM4051B
LM4051C
1.2
2.4
6.0
45
7
9
Reverse Breakdown Voltage
Tolerance (Note 2)
V
mV
µA
RTOL
12
60
Minimum Operating Current
I
RMIN
I
R
I
R
I
R
= 10mA
= 1mA
20
Average Reverse Voltage
Temperature Coefficient
(Notes 2, 3)
15
50
ΔV /ΔT
ppm/°C
R
= 100µA
15
Reverse Breakdown Voltage
Change with Operating
Current Change
I
≤ I ≤ 1mA
0.7
2.5
1.5
8.0
RMIN
R
mV
1mA ≤ I ≤ 12mA
R
Reverse Dynamic
Impedance (Note 3)
Z
I
I
= 1mA, f = 120Hz, I = 0.1I
R
0.5
20
1.5
Ω
R
R
AC
Wideband Noise
e
= 100µA, 10Hz ≤ f ≤ 10kHz
µV
RMS
N
R
Reverse Breakdown Voltage
Long-Term Stability
ΔV
T = 1000h
120
ppm
R
2
_______________________________________________________________________________________
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
ELECTRICAL CHARACTERISTICS—2.048V
(I = 100µA, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
MAX A
R
A
MIN
PARAMETER
SYMBOL
CONDITIONS
LM4050A (0.1%)
MIN
TYP
MAX
UNITS
2.0460 2.0480 2.0500
2.0439 2.0480 2.0521
2.0378 2.0480 2.0582
Reverse Breakdown Voltage
V
R
T
A
= +25°C
V
LM4050B (0.2%)
LM4050C (0.5%)
LM4050A
LM4050B
LM4050C
2.0
4.0
10
45
20
15
15
12
14
20
65
Reverse Breakdown Voltage
Tolerance (Note 2)
V
mV
µA
RTOL
Minimum Operating Current
I
RMIN
I
R
I
R
I
R
= 10mA
= 1mA
Average Reverse Voltage
Temperature Coefficient
(Notes 2, 3)
50
ΔV /ΔT
ppm/°C
R
= 100µA
Reverse Breakdown Voltage
Change with Operating
Current Change
I
≤ I ≤ 1mA
0.3
2.5
1.0
8.0
RMIN
R
mV
1mA ≤ I ≤ 15mA
R
LM4050A/B
LM4050C
0.3
0.3
28
0.8
0.9
Reverse Dynamic
Impedance (Note 3)
I
I
= 1mA, f = 120Hz,
R
Z
Ω
R
= 0.1I
R
AC
Wideband Noise
e
I
R
= 100µA, 10Hz ≤ f ≤ 10kHz
µV
RMS
N
Reverse Breakdown Voltage
Long-Term Stability
ΔV
T = 1000h
120
ppm
R
_______________________________________________________________________________________
3
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
ELECTRICAL CHARACTERISTICS—2.500V
(I = 100µA, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
MAX A
R
A
MIN
PARAMETER
SYMBOL
CONDITIONS
LM4050A (0.1%)
MIN
TYP
MAX
UNITS
2.4975 2.5000 2.5025
2.4950 2.5000 2.5050
2.4875 2.5000 2.5125
Reverse Breakdown Voltage
V
R
T
A
= +25°C
V
LM4050B (0.2%)
LM4050C (0.5%)
LM4050A
LM4050B
LM4050C
2.5
5.0
13
45
20
15
15
15
18
25
65
Reverse Breakdown Voltage
Tolerance (Note 2)
V
mV
µA
RTOL
Minimum Operating Current
I
RMIN
I
R
I
R
I
R
= 10mA
= 1mA
Average Reverse Voltage
Temperature Coefficient
(Notes 2, 3)
ΔV /ΔT
50
ppm/°C
R
= 100µA
Reverse Breakdown Voltage
Change with Operating
Current Change
I
≤ I ≤ 1mA
0.3
2.5
1.0
8.0
RMIN
R
mV
1mA ≤ I ≤ 15mA
R
LM4050A/B
LM4050C
0.3
0.3
35
0.8
0.9
Reverse Dynamic
Impedance (Note 3)
I
I
= 1mA, f = 120Hz,
R
Z
Ω
R
= 0.1I
R
AC
Wideband Noise
e
I
R
= 100µA, 10Hz ≤ f ≤ 10kHz
µV
RMS
N
Reverse Breakdown Voltage
Long-Term Stability
ΔV
T = 1000h
120
ppm
R
4
_______________________________________________________________________________________
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
ELECTRICAL CHARACTERISTICS—3.000V
(I = 100µA, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
MAX A
R
A
MIN
PARAMETER
SYMBOL
CONDITIONS
LM4050A (0.1%)
MIN
TYP
MAX
UNITS
2.9970 3.0000 3.0030
2.9940 3.0000 3.0060
2.9850 3.0000 3.0150
Reverse Breakdown Voltage
V
R
T
A
= +25°C
V
LM4050B (0.2%)
LM4050C (0.5%)
LM4050A
LM4050B
LM4050C
3.0
6.0
15
45
20
15
15
18
21
30
67
Reverse Breakdown Voltage
Tolerance (Note 2)
V
mV
µA
RTOL
Minimum Operating Current
I
RMIN
I
R
I
R
I
R
= 10mA
= 1mA
Average Reverse Voltage
Temperature Coefficient
(Notes 2, 3)
ΔV /ΔT
50
ppm/°C
R
= 100µA
Reverse Breakdown Voltage
Change with Operating
Current Change
I
≤ I ≤ 1mA
0.3
2.5
1.0
8.0
RMIN
R
mV
1mA ≤ I ≤ 15mA
R
LM4050A/B
LM4050C
0.3
0.3
45
0.8
0.9
Reverse Dynamic
Impedance (Note 3)
I
I
= 1mA, f = 120Hz,
R
Z
Ω
R
= 0.1I
R
AC
Wideband Noise
e
I
R
= 100µA, 10Hz ≤ f ≤ 10kHz
µV
RMS
N
Reverse Breakdown Voltage
Long-Term Stability
ΔV
T = 1000h
120
ppm
R
ELECTRICAL CHARACTERISTICS—3.300V
(I = 100µA, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
MAX A
R
A
MIN
PARAMETER
SYMBOL
CONDITIONS
LM4050A (0.1%)
MIN
TYP
MAX
UNITS
3.2967 3.3000 3.3033
3.2934 3.3000 3.3066
3.2835 3.3000 3.3165
Reverse Breakdown Voltage
V
R
T
A
= +25°C
V
LM4050B (0.2%)
LM4050C (0.5%)
LM4050A
LM4050B
LM4050C
3.0
6.0
15
45
20
15
15
18
21
30
67
Reverse Breakdown Voltage
Tolerance (Note 2)
V
mV
µA
RTOL
Minimum Operating Current
I
RMIN
I
R
I
R
I
R
= 10mA
= 1mA
Average Reverse Voltage
Temperature Coefficient
(Notes 2, 3)
ΔV /ΔT
50
ppm/°C
R
= 100µA
Reverse Breakdown Voltage
Change with Operating
Current Change
I
≤ I ≤ 1mA
0.3
2.5
1.0
8.0
RMIN
R
mV
1mA ≤ I ≤ 15mA
R
LM4050A/B
LM4050C
0.3
0.3
50
0.8
0.9
Reverse Dynamic
Impedance (Note 3)
I
I
= 1mA, f = 120Hz,
R
Z
Ω
R
= 0.1I
R
AC
Wideband Noise
e
I
R
= 100µA, 10Hz ≤ f ≤ 10kHz
µV
RMS
N
Reverse Breakdown Voltage
Long-Term Stability
ΔV
T = 1000h
120
ppm
R
_______________________________________________________________________________________
5
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
ELECTRICAL CHARACTERISTICS—4.096V
(I = 100µA, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
MAX A
R
A
MIN
PARAMETER
SYMBOL
CONDITIONS
LM4050A (0.1%)
MIN
TYP
MAX
UNITS
4.0919 4.0960 4.1001
4.0878 4.0960 4.1042
4.0755 4.0960 4.1165
Reverse Breakdown Voltage
V
R
T
A
= +25°C
V
LM4050B (0.2%)
LM4050C (0.5%)
LM4050A
LM4050B
LM4050C
4.1
8.2
20
50
30
20
15
25
29
41
73
Reverse Breakdown Voltage
Tolerance (Note 2)
V
mV
µA
RTOL
Minimum Operating Current
I
RMIN
I
R
I
R
I
R
= 10mA
= 1mA
Average Reverse Voltage
Temperature Coefficient
(Notes 2, 3)
ΔV /ΔT
50
ppm/°C
R
= 100µA
Reverse Breakdown Voltage
Change with Operating
Current Change
I
≤ I ≤ 1mA
0.5
3.0
1.2
RMIN
R
mV
1mA ≤ I ≤ 15mA
10.0
R
Reverse Dynamic
Impedance (Note 3)
Z
I
R
I
R
= 1mA, f = 120Hz, I = 0.1I
R
0.5
64
1.0
Ω
R
AC
Wideband Noise
e
= 100µA, 10Hz ≤ f ≤ 10kHz
µV
RMS
N
Reverse Breakdown Voltage
Long-Term Stability
ΔV
T = 1000h
120
ppm
R
6
_______________________________________________________________________________________
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
ELECTRICAL CHARACTERISTICS—5.000V
(I = 100µA, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
MAX A
R
A
MIN
PARAMETER
SYMBOL
CONDITIONS
LM4050A (0.1%)
MIN
TYP
MAX
UNITS
4.9950 5.0000 5.0050
4.9900 5.0000 5.0100
4.9750 5.0000 5.0250
Reverse Breakdown Voltage
V
R
T
A
= +25°C
V
LM4050B (0.2%)
LM4050C (0.5%)
LM4050A
LM4050B
LM4050C
5.0
10
25
54
30
20
15
30
35
50
80
Reverse Breakdown Voltage
Tolerance (Note 2)
V
mV
µA
RTOL
Minimum Operating Current
I
RMIN
I
R
I
R
I
R
= 10mA
= 1mA
Average Reverse Voltage
Temperature Coefficient
(Notes 2, 3)
ΔV /ΔT
50
ppm/°C
R
= 100µA
Reverse Breakdown Voltage
Change with Operating
Current Change
I
≤ I ≤ 1mA
0.5
3.5
1.4
RMIN
R
mV
1mA ≤ I ≤ 15mA
12.0
R
Reverse Dynamic
Impedance (Note 3)
Z
I
I
= 1mA, f = 120Hz, I = 0.1I
R
0.5
80
1.1
Ω
R
R
AC
Wideband Noise
e
= 100µA, 10Hz ≤ f ≤ 10kHz
µV
RMS
N
R
Reverse Breakdown Voltage
Long-Term Stability
ΔV
T = 1000h
120
ppm
R
Note 1: All devices are 100% production tested at +25°C and are guaranteed by design for T = T
to T
, as specified.
MAX
A
MIN
Note 2: The limit over the full temperature range for the reverse breakdown voltage tolerance is defined as:
[V [(ΔV / ΔT) X (maxΔT) X (V )]
]
RTOL
R
R
where ΔV / ΔT is the V temperature coefficient, maxΔT is the difference from the +25°C reference point to T
or T
,
MAX
R
R
MIN
and V is the reverse breakdown voltage.
R
The total tolerance over the full temperature range for the different grades where maxΔT = +100°C is shown below:
✕
• A grade: 0.6% = 0.1% 50ppm/°C 100°C
✕
• B grade: 0.7% = 0.2% 50ppm/°C 100°C
✕
• C grade: 1.0% = 0.5% 50ppm/°C 100°C
Note 3: Guaranteed by design.
_______________________________________________________________________________________
7
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
Typical Operating Characteristics
(I = 100µA, SC70-3 package, T = +25°C, unless otherwise noted.)
R
A
REVERSE CHARACTERISTICS AND
MINIMUM OPERATING CURRENT
OUTPUT VOLTAGE vs. TEMPERATURE
(V = 2.500V)
OUTPUT VOLTAGE vs. TEMPERATURE
(V = 5.000V)
OUT
OUT
6
5
4
3
2
1
0
2.498
2.496
2.494
2.492
2.490
LM4050_I_3-4.1
LM4050_I_3-5.0
5.003
5.001
4.999
4.997
LM4050_I_3-3.0
4.995
4.993
4.991
4.989
4.987
LM4050_I_3-2.5
LM4050_I_3-2.1
0
50
REVERSE CURRENT (μA)
100
-40 -15
10
35
60
85 110 135
-40 -15
10
35
60
85 110 135
TEMPERATURE (°C)
TEMPERATURE (°C)
LM4050-2.5V
LM4050-5.0V
REVERSE VOLTAGE vs. I
REVERSE VOLTAGE vs. I
SHUNT
SHUNT
5
4
3
2
1
0
6
5
4
3
2
1
0
T
= +125°C
A
T
= -40°C
A
T
= -40°C
A
T
= +125°C
A
T
= +25°C
A
T
= +85°C
A
T
= +85°C
A
T
A
= +25°C
0
5
10
(mA)
15
20
0
5
10
(mA)
15
20
I
I
SHUNT
SHUNT
8
_______________________________________________________________________________________
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
Typical Operating Characteristics (continued)
(I = 100µA, SC70-3 package, T = +25°C, unless otherwise noted.)
R
A
LM4050-2.5V
LOAD-TRANSIENT RESPONSE
LM4050-2.5V
LOAD-TRANSIENT RESPONSE
LM4050-5.0V
LOAD-TRANSIENT RESPONSE
LM4050 toc08
LM4050 toc06
LM4050 toc07
+250μA
+25μA
+25μA
-250μA
-25μA
-25μA
10mV/div
2mV/div
10mV/div
10μs/div
= 1mA 250μA
SHUNT
10μs/div
CH2: V AC-COUPLED 2mV/div
40μs/div
= 100μA 25μA
I
CH1: V 2V/div
I
GEN
SHUNT
L
R = 10kΩ, SEE FIGURE 1.
R = 100kΩ, SEE FIGURE 1.
L
R
I
= 100μA 25μA, R = 100kΩ, SEE FIGURE 1.
SHUNT
L
LM4050-2.5V
LOAD-TRANSIENT RESPONSE
LM4050-5.0V
LOAD-TRANSIENT RESPONSE
LM4050-5.0V
LOAD-TRANSIENT RESPONSE
LM4050 toc10
LM4050 toc11
LM4050 toc09
+2.5mA
+2.5mA
+250μA
-2.5mA
-2.5mA
-250μA
20mV/div
20mV/div
10mV/div
10μs/div
= 10mA 2.5mA
R = 1kΩ, SEE FIGURE 1.
10μs/div
= 10mA 2.5mA
R = 1kΩ, SEE FIGURE 1.
10μs/div
I
I
SHUNT
L
I
= 1mA 250μA
R = 10kΩ, SEE FIGURE 1.
SHUNT
L
SHUNT
L
I
SHUNT
1kΩ
+
-
V
B
R
L
V
R
V
GEN
Figure 1. Load-Transient Test Circuit
_______________________________________________________________________________________
9
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
Typical Operating Characteristics (continued)
(I = 100µA, SC70-3 package, T = +25°C, unless otherwise noted.)
R
A
LM4050-2.5V
STARTUP CHARACTERISTICS
LM4050-5.0V
STARTUP CHARACTERISTICS
LM4050-2.5V
OUTPUT IMPEDANCE vs. FREQUENCY
LM4050 toc12
LM4050 toc13
1000
5V
0
5V
0
C = 1μF
1
100
10
I
= 150μA
R
2V
1V
0
4V
2V
0
C = 0
1
1
I
= 1mA
R
R
= 30kΩ
S
R = 16kΩ
S
0.1
0
4
8
12 16 20 24 28 32 36
0
10 20 30 40 50 60 70 80 90
0.1k
1k
10k
100k
1M
RESPONSE TIME (μs)
RESPONSE TIME (μs)
FREQUENCY (Hz)
SEE FIGURE 2.
SEE FIGURE 2.
LM4050-5.0V
OUTPUT IMPEDANCE vs. FREQUENCY
LM4050-2.5V
NOISE vs. FREQUENCY
LM4050-5.0V
NOISE vs. FREQUENCY
100
10
1
10,000
10,000
1000
100
C = 0
1
I
= 150μA
R
1000
I
= 1mA
R
C = 1μF
1
0.1
100
0.1k
1k
10k
FREQUENCY (Hz)
100k
1M
1
10
100
1k
10k
1
10
100
1k
10k
FREQUENCY (Hz)
FREQUENCY (Hz)
R
S
V
IN
V
R
1Hz RATE
50%
DUTY CYCLE
Figure 2. Startup Characteristics Test Circuit
10 ______________________________________________________________________________________
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
Pin Description
PIN
1
NAME
+
FUNCTION
Positive Terminal of the Shunt Reference
Negative Terminal of the Shunt Reference
2
−
3
N.C.
No connection. Leave this pin unconnected or connected to pin 2.
V
Detailed Description
S
I
+ I
The LM4050/LM4051 shunt references use the
bandgap principle to produce a stable, accurate volt-
age. The device behaves similarly to an ideal zener
diode; a fixed voltage is maintained across its output
terminals when biased with 60µA to 15mA of reverse
current. The LM4050/LM4051 clamps to a voltage of
one diode drop below ground when biased with for-
ward currents up 10mA.
SHUNT LOAD
R
S
I
LOAD
V
R
I
SHUNT
LM4050
Figure 3 shows a typical operating circuit. The
LM4050/LM4051 are ideal for providing stable refer-
ences from a high-voltage power supply.
Figure 3. Typical Operating Circuit
Applications Information
Temperature Performance
The LM4050/LM4051 typically exhibit output voltage
temperature coefficients within 15ppm/°C. The polari-
ty of the temperature coefficients may be different from
one device to another; some may have positive coeffi-
cients, and others may have negative coefficients.
The LM4050/LM4051s’ internal pass transistors are used
to maintain a constant output voltage (V ) by sinking
SHUNT
the necessary amount of current across a source resistor.
The source resistance (R ) is determined from the load
S
current (I
V
) range, supply voltage (V ) variations,
LOAD
S
, and desired quiescent current.
SHUNT
High Temperature Operation
The maximum junction temperature of the LM4050/
LM4051 is +150°C. The maximum operating temperature
for the LM4050/LM4051_E_ is +125°C. At a maximum
load current of 15mA and a maximum output voltage of
5V, the parts dissipate 75mW of power. The power dissi-
pation limits of the 3-pin SC70 call for a derating value of
2.17mW/°C above +70°C and thus for 75mW of power
dissipation, the parts self-heat to 35.56°C above ambient
temperature. If the ambient temperature is +125°C, the
parts operate at 159.56°C, thereby exceeding the maxi-
mum junction temperature value of +150°C. For high-
temperature operation, care must be taken to ensure the
combination of ambient temperature, output power dissi-
pation, and package thermal resistance does not con-
spire to raise the device temperature beyond that listed
in the Absolute Maximum Ratings. Either reduce the out-
put load current or the ambient temperature to keep the
part within the limits.
Choose the value of R when V is at a minimum and I
S
S
LOAD
of 60µA at all
is at a maximum. Maintain a minimum I
SHUNT
times. The R value should be large enough to keep
S
I
less than 15mA for proper regulation when V is
SHUNT
S
maximum and I
is at a minimum. To prevent damage
should never exceed 20mA.
LOAD
to the device, I
SHUNT
Therefore, the value of R is bounded by the following
S
equation:
[V
S(MIN)
[V
S(MAX)
- V ] / [60µA + I
] > R >
LOAD(MIN)
R
LOAD(MAX) S
- V ] / [20mA + I
]
R
Choosing a larger resistance minimizes the total power dis-
sipation in the circuit by reducing the shunt current
✕
(P
= V
I ). Provide a safety margin to
SHUNT
D(TOTAL)
S
incorporate the worst-case tolerance of the resistor used.
Ensure that the resistor’s power rating is adequate, using
the following general power equation:
✕
PD = I
(V
S(MAX)
- V
)
R
SHUNT
SHUNT
Output Capacitance
Chip Information
TRANSISTOR COUNT: 60
The LM4050/LM4051 do not require external capacitors
for frequency stability and are stable for any output
capacitance.
PROCESS: BiCMOS
______________________________________________________________________________________ 11
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
Ordering Information
OUTPUT
VOLTAGE
(V)
INITIAL
ACCURACY
(%)
TEMPCO
(ppm/°C)
TOP
MARK
PART
TEMP RANGE
PIN-PACKAGE
LM4050AEM3-2.1+T
LM4050AEX3-2.1+T
LM4050BEM3-2.1+T
LM4050BEX3-2.1+T
LM4050CEM3-2.1+T
LM4050CEX3-2.1+T
LM4050AEM3-2.5+T
LM4050AEX3-2.5+T
LM4050BEM3-2.5+T
LM4050BEX3-2.5+T
LM4050CEM3-2.5+T
LM4050CEX3-2.5+T
LM4050AEM3-3.0+T
LM4050AEX3-3.0+T
LM4050BEM3-3.0+T
LM4050BEX3-3.0+T
LM4050CEM3-3.0+T
LM4050CEX3-3.0+T
LM4050AEX3-3.3+T
LM4050BEX3-3.3+T
LM4050CEX3-3.3+T
LM4050AEM3-4.1+T
LM4050AEX3-4.1+T
LM4050BEM3-4.1+T
LM4050BEX3-4.1+T
LM4050CEM3-4.1+T
LM4050CEX3-4.1+T
LM4050AEM3-5.0+T
LM4050AEX3-5.0+T
LM4050BEM3-5.0+T
LM4050BEX3-5.0+T
LM4050CEM3-5.0+T
LM4050CEX3-5.0+T
LM4051AEM3-1.2+T
LM4051AEX3-1.2+T
LM4051BEM3-1.2+T
LM4051BEX3-1.2+T
LM4051CEM3-1.2+T
LM4051CEX3-1.2+T
2.048
2.048
2.048
2.048
2.048
2.048
2.500
2.500
2.500
2.500
2.500
2.500
3.000
3.000
3.000
3.000
3.000
3.000
3.300
3.300
3.300
4.096
4.096
4.096
4.096
4.096
4.096
5.000
5.000
5.000
5.000
5.000
5.000
1.225
1.225
1.225
1.225
1.225
1.225
0.1
0.1
0.2
0.2
0.5
0.5
0.1
0.1
0.2
0.2
0.5
0.5
0.1
0.1
0.2
0.2
0.5
0.5
0.1
0.2
0.5
0.1
0.1
0.2
0.2
0.5
0.5
0.1
0.1
0.2
0.2
0.5
0.5
0.1
0.1
0.2
0.2
0.5
0.5
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
3 SOT23
3 SC70
3 SOT23
3 SC70
3 SOT23
3 SC70
3 SOT23
3 SC70
3 SOT23
3 SC70
3 SOT23
3 SC70
3 SOT23
3 SC70
3 SOT23
3 SC70
3 SOT23
3 SC70
3 SC70
3 SC70
3 SC70
3 SOT23
3 SC70
3 SOT23
3 SC70
3 SOT23
3 SC70
3 SOT23
3 SC70
3 SOT23
3 SC70
3 SOT23
3 SC70
3 SOT23
3 SC70
3 SOT23
3 SC70
3 SOT23
3 SC70
FZTR
ASM
FZTS
ASN
FZTT
ASO
FZTU
ASP
FZTV
ASQ
FZTW
ASR
FZTX
ASS
FZTY
AST
FZTZ
ASU
AOJ
AOK
AOL
FZUA
ASV
FZUB
ASW
FZUC
ASX
FZUD
ASY
FZUE
ASZ
FZUF
ATA
FZTO
ASJ
FZTP
ASK
FZTQ
ASL
12 ______________________________________________________________________________________
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
PACKAGE TYPE
3 SOT23
PACKAGE CODE
U3+1
DOCUMENT NO.
21-0051
3 SC70
X3+2
21-0075
Revision History
REVISION
NUMBER
REVISION
DATE
DESCRIPTION
PAGES CHANGED
0
7/02
Initial release
—
Added lead-free notation and corrected topmarks in the
Ordering Information and Selector Guide sections
4
5/09
1, 12
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
13 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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