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19-2563; Rev 3; 3/06
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
General Description
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).
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.
The LM4050/LM4051 specifications are guaranteed
over the temperature range of -40°C to +125°C.
Features
♦
50ppm/°C (max) Temperature Coefficient
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
RMS
Output Noise (10Hz to 10kHz)
♦
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
LM4050/LM4051
Selector Guide
PART
LM4050_EM3-2.1
LM4050_EX3-2.1
LM4050_EM3-2.5
LM4050_EX3-2.5
LM4050_EX3-3.0
LM4050_EX3-3.3
LM4050_EM3-4.1
LM4050_EX3-4.1
LM4050_EM3-5.0
LM4050_EX3-5.0
LM4051_EM3-1.2
LM4051_EX3-1.2
PIN-
PACKAGE
3 SOT 23-3
3 SC70-3
3 SOT 23-3
3 SC70-3
3 SC70-3
3 SC70-3
3 SOT 23-3
3 SC70-3
3 SOT 23-3
3 SC70-3
3 SOT 23-3
3 SC70-3
OUTPUT
VOLTAGE (V)
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
PACKAGE
CODE
U3-1
X3-2
U3-1
X3-2
U3-1
X3-2
X3-2
U3-1
X3-2
U3-1
X3-2
U3-1
X3-2
________________________Applications
Portable, Battery-Powered Equipment
Notebook Computers
Cell Phones
Industrial Process Controls
LM4050_ EM3-3.0 3 SOT 23-3
Typical Operating Circuit
V
S
I
SHUNT
+ I
LOAD
R
S
I
LOAD
V
R
I
SHUNT
LM4050/LM4051
Note:
All devices are specified over the -40°C to +125°C oper-
ating temperature range.
Ordering Information appears at end of data sheet.
Pin Configuration
TOP VIEW
+
1
LM4050/
LM4051
-
2
3
N.C.*
SC70-3/SOT23-3
*PIN 3 MUST BE LEFT FLOATING
OR CONNECTED TO PIN 2.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas 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
LM4050/LM4051
ABSOLUTE MAXIMUM RATINGS
Reverse Current (cathode to anode) ..................................20mA
Forward Current (anode to cathode) ..................................10mA
Continuous Power Dissipation (T
A
= +70°C)
3-Pin SC70 (derate 2.17mW/°C above +70°C) ............174mW
3-Pin SOT23 (derate 4.01mW/°C above +70°C)..........320mW
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
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
R
= 100µA, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Reverse Breakdown Voltage
SYMBOL
V
R
T
A
= +25°C
LM4051A
Reverse Breakdown Voltage
Tolerance (Note 2)
Minimum Operating Current
Average Reverse Voltage
Temperature Coefficient
(Notes 2, 3)
Reverse Breakdown Voltage
Change with Operating
Current Change
Reverse Dynamic
Impedance (Note 3)
Wideband Noise
Reverse Breakdown Voltage
Long-Term Stability
Z
R
e
N
∆V
R
V
RTOL
I
RMIN
∆V
R
/∆T
I
R
= 10mA
I
R
= 1mA
I
R
= 100µA
I
RMIN
≤
I
R
≤
1mA
1mA
≤
I
R
≤
12mA
I
R
= 1mA, f = 120Hz, I
AC
= 0.1I
R
I
R
= 100µA, 10Hz
≤
f
≤
10kHz
T = 1000h
LM4051B
LM4051C
CONDITIONS
LM4051A (0.1%)
LM4051B (0.2%)
LM4051C (0.5%)
MIN
1.2238
1.2226
1.2189
TYP
1.2250
1.2250
1.2250
±1.2
±2.4
±6.0
45
±20
±15
±15
0.7
2.5
0.5
20
120
1.5
mV
8.0
1.5
Ω
µV
RMS
ppm
MAX
1.2262
1.2275
1.2311
±7
±9
±12
60
±50
µA
ppm/°C
mV
V
UNITS
2
_______________________________________________________________________________________
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
ELECTRICAL CHARACTERISTICS—2.048V
(I
R
= 100µA, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Reverse Breakdown Voltage
SYMBOL
V
R
T
A
= +25°C
LM4050A
Reverse Breakdown Voltage
Tolerance (Note 2)
Minimum Operating Current
Average Reverse Voltage
Temperature Coefficient
(Notes 2, 3)
Reverse Breakdown Voltage
Change with Operating
Current Change
Reverse Dynamic
Impedance (Note 3)
Wideband Noise
Reverse Breakdown Voltage
Long-Term Stability
Z
R
e
N
∆V
R
V
RTOL
I
RMIN
∆V
R
/∆T
I
R
= 10mA
I
R
= 1mA
I
R
= 100µA
I
RMIN
≤
I
R
≤
1mA
1mA
≤
I
R
≤
15mA
I
R
= 1mA, f = 120Hz,
I
AC
= 0.1I
R
LM4050A/B
LM4050C
LM4050B
LM4050C
CONDITIONS
LM4050A (0.1%)
LM4050B (0.2%)
LM4050C (0.5%)
MIN
2.0460
2.0439
2.0378
TYP
2.0480
2.0480
2.0480
±2.0
±4.0
±10
45
±20
±15
±15
0.3
2.5
0.3
0.3
28
120
1.0
mV
8.0
0.8
0.9
Ω
µV
RMS
ppm
MAX
2.0500
2.0521
2.0582
±12
±14
±20
65
±50
µA
ppm/°C
mV
V
UNITS
LM4050/LM4051
I
R
= 100µA, 10Hz
≤
f
≤
10kHz
T = 1000h
_______________________________________________________________________________________
3
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
LM4050/LM4051
ELECTRICAL CHARACTERISTICS—2.500V
(I
R
= 100µA, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Reverse Breakdown Voltage
SYMBOL
V
R
T
A
= +25°C
LM4050A
Reverse Breakdown Voltage
Tolerance (Note 2)
Minimum Operating Current
Average Reverse Voltage
Temperature Coefficient
(Notes 2, 3)
Reverse Breakdown Voltage
Change with Operating
Current Change
Reverse Dynamic
Impedance (Note 3)
Wideband Noise
Reverse Breakdown Voltage
Long-Term Stability
Z
R
e
N
∆V
R
V
RTOL
I
RMIN
I
R
= 10mA
∆V
R
/∆T
I
R
= 1mA
I
R
= 100µA
I
RMIN
≤
I
R
≤
1mA
1mA
≤
I
R
≤
15mA
I
R
= 1mA, f = 120Hz,
I
AC
= 0.1I
R
LM4050A/B
LM4050C
LM4050B
LM4050C
CONDITIONS
LM4050A (0.1%)
LM4050B (0.2%)
LM4050C (0.5%)
MIN
2.4975
2.4950
2.4875
TYP
2.5000
2.5000
2.5000
±2.5
±5.0
±13
45
±20
±15
±15
0.3
2.5
0.3
0.3
35
120
1.0
mV
8.0
0.8
0.9
Ω
µV
RMS
ppm
±50
ppm/°C
MAX
2.5025
2.5050
2.5125
±15
±18
±25
65
µA
mV
V
UNITS
I
R
= 100µA, 10Hz
≤
f
≤
10kHz
T = 1000h
4
_______________________________________________________________________________________
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