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19-2090; Rev 2; 4/04
0.1%, 25ppm, SC70 Shunt Voltage Reference
with Multiple Reverse Breakdown Voltages
General Description
The MAX6138 is a precision, two-terminal shunt mode,
bandgap voltage reference available in fixed reverse
breakdown voltages of 1.2205V, 2.048V, 2.5V, 3.0V,
3.3V, 4.096V, and 5.0V. Ideal for space-critical applica-
tions, the MAX6138 is offered in the subminiature 3-pin
SC70 surface-mount package (1.8mm X 1.8mm), 50%
smaller than comparable devices in SOT23 surface-
mount packages.
Laser-trimmed resistors ensure precise initial accuracy.
With a 25ppm/°C temperature coefficient, the device is
offered in three grades of initial accuracy ranging from
0.1% to 0.5%. The MAX6138 has a 60µA to 15mA shunt-
current capability with low-dynamic impedance, ensuring
stable reverse breakdown voltage accuracy over a wide
range of operating temperatures and currents.
The MAX6138 does not require an external stabilizing
capacitor while ensuring stability with capacitive loads.
The MAX6138 is a higher precision device in a smaller
package than the LM4040/LM4050.
o
Ultra-Small 3-Pin SC70 Package
o
0.1% (max) Initial Accuracy
o
25ppm/°C (max) Temperature Coefficient
Guaranteed Over -40°C to +85°C Temperature
Range
o
Wide Operating Current Range: 60µA to 15mA
o
Low 28µV
RMS
Output Noise (10Hz to 10kHz)
o
1.2205V, 2.048V, 2.5V, 3.0V, 3.3V, 4.096V, and 5.0V
Fixed Reverse Breakdown Voltages
o
No Output Capacitors Required
o
Stable with Capacitive Loads
Features
MAX6138
Selector Guide
PART
TEMP
RANGE
OUTPUT
PIN-
VOLTAGE
PACKAGE
(V)
3 SC70-3
3 SC70-3
3 SC70-3
3 SC70-3
3 SC70-3
3 SC70-3
3 SC70-3
1.2205
2.0480
2.5000
3.0000
3.3000
4.0960
5.0000
Applications
Portable, Battery-Powered Equipment
Notebook Computers
Cell Phones
Industrial Process Control
MAX6138_EXR12-T -40°C to +85°C
MAX6138_EXR21-T -40°C to +85°C
MAX6138_EXR25-T -40°C to +85°C
MAX6138_EXR30-T -40°C to +85°C
MAX6138_EXR33-T -40°C to +85°C
MAX6138_EXR41-T -40°C to +85°C
MAX6138_EXR50-T -40°C to +85°C
Ordering Information appears at end of data sheet.
Typical Operating Circuit
Pin Configuration
TOP VIEW
+
1
R
S
V
S
I
SHUNT
+ I
LOAD
I
LOAD
V
R
MAX6138
-
2
3
N.C.*
I
SHUNT
SC70
*PIN 3 MUST BE LEFT FLOATING
OR CONNECTED TO PIN 2.
MAX6138
________________________________________________________________
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.
0.1%, 25ppm, SC70 Shunt Voltage Reference
with Multiple Reverse Breakdown Voltages
MAX6138
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
Operating Temperature Range .........................-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—MAX6138_12 (1.2205V)
(I
R
= 100µA, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Reverse Breakdown Voltage
(Note 2)
Minimum Operating Current
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
SYMBOL
CONDITIONS
MAX6138A (0.1%)
V
R
I
RMIN
TC
I
RMIN
≤
I
R
≤
1mA
∆V
R
/∆I
R
1mA
≤
I
R
≤
12mA
I
R
= 1mA, f = 120Hz, I
AC
= 0.1I
R
I
R
= 10µA, 10Hz
≤
f
≤
10kHz
t = 1000h
T
A
= +25°C
MAX6138B (0.2%)
MAX6138C (0.5%)
MIN
1.2193
1.2181
1.2144
TYP
1.2205
1.2205
1.2205
45
4
MAX
1.2217
1.2229
1.2266
60
25
µA
ppm/°C
V
UNITS
0.3
2.5
0.3
20
120
1.0
mV
8.0
0.8
Ω
µV
RMS
ppm
Z
R
e
N
∆V
R
2
_______________________________________________________________________________________
0.1%, 25ppm, SC70 Shunt Voltage Reference
with Multiple Reverse Breakdown Voltages
ELECTRICAL CHARACTERISTICS—MAX6138_21 (2.048V)
(I
R
= 100µA, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Reverse Breakdown
Voltage (Note 2)
Minimum Operating Current
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
SYMBOL
V
R
I
RMIN
TC
I
RMIN
≤
I
R
≤
1mA
1mA
≤
I
R
≤
15mA
I
R
= 1mA, f = 120Hz, I
AC
= 0.1I
R
10Hz
≤
f
≤
10kHz
t = 1000h
T
A
= +25°C
CONDITIONS
MAX6138A (0.1%)
MAX6138B (0.2%)
MAX6138C (0.5%)
MIN
2.0460
2.0439
2.0378
TYP
2.0480
2.0480
2.0480
45
4
MAX
2.0500
2.0521
2.0582
65
25
µA
ppm/°C
V
UNITS
MAX6138
∆V
R
/∆I
R
0.3
2.5
0.3
28
120
1.0
mV
8.0
0.8
Ω
µV
RMS
ppm
Z
R
e
N
∆V
R
ELECTRICAL CHARACTERISTICS—MAX6138_25 (2.5V)
(I
R
= 100µA, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Reverse Breakdown Voltage
(Note 2)
Minimum Operating Current
Reverse Voltage Temperature
Coefficient (Notes 2, 3)
Reverse Breakdown Voltage
Change with Operating Current
Change
Reverse Breakdown Voltage
Change with Operating Current
Change
Reverse Dynamic Impedance
(Note 3)
Wideband Noise
Reverse Breakdown Voltage
Long-Term Stability
SYMBOL
CONDITIONS
MAX6138A (0.1%)
V
R
I
RMIN
TC
T
A
= +25°C
MAX6138B (0.2%)
MAX6138C (0.2%)
MIN
2.4975
2.4950
2.4875
TYP
2.5000
2.5000
2.5000
45
4
MAX
2.5025
2.5050
2.5125
65
25
µA
ppm/°C
V
UNITS
∆V
R
/∆I
R
I
RMIN
≤
I
R
≤
1mA
0.3
1.0
mV
∆V
R
/∆I
R
1mA
≤
I
R
≤
15mA
2.5
8.0
mV
Z
R
e
N
∆V
R
I
R
= 1mA, f = 120Hz, I
AC
= 0.1I
R
10Hz
≤
f
≤
10kHz
t = 1000h
0.3
35
120
0.8
Ω
µV
RMS
ppm
_______________________________________________________________________________________
3
0.1%, 25ppm, SC70 Shunt Voltage Reference
with Multiple Reverse Breakdown Voltages
MAX6138
ELECTRICAL CHARACTERISTICS—MAX6138_30 (3.0V)
(I
R
= 100µA, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Reverse Breakdown
Voltage (Note 2)
Minimum Operating
Current
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
SYMBOL
CONDITIONS
MAX6138A (0.1%)
V
R
T
A
= +25°C
MAX6138B (0.2%)
MAX6138C (0.5%)
I
RMIN
MIN
2.9970
2.9940
2.9850
TYP
3.0000
3.0000
3.0000
45
MAX
3.0030
3.0060
3.0150
65
µA
V
UNITS
TC
4
25
ppm/°C
∆V
R
/∆I
R
I
RMIN
≤
I
R
≤
1mA
1mA
≤
I
R
≤
15mA
I
R
= 1mA, f =120Hz, I
AC
= 0.1I
R
10Hz
≤
f
≤
10kHz
t = 1000h
0.3
2.5
0.3
45
120
1.0
mV
8.0
0.8
Ω
µV
RMS
ppm
Z
R
e
N
∆V
R
ELECTRICAL CHARACTERISTICS—MAX6138_33 (3.3V)
(I
R
= 100µA, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Reverse Breakdown
Voltage (Note 2)
Minimum Operating Current
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
SYMBOL
CONDITIONS
MAX6138A (0.1%)
V
R
I
RMIN
TC
T
A
= +25°C
MAX6138B (0.2%)
MAX6138C (0.5%)
MIN
3.2967
3.2934
3.2835
TYP
3.3000
3.3000
3.3000
45
MAX
3.3033
3.3066
3.3165
67
µA
V
UNITS
4
25
ppm/°C
∆V
R
/∆I
R
I
RMIN
≤
I
R
≤
1mA
1mA
≤
I
R
≤
15mA
I
R
= 1mA, f =120Hz, I
AC
= 0.1I
R
10Hz
≤
f
≤
10kHz
t = 1000h
0.3
1.0
mV
8.0
Z
R
e
N
∆V
R
0.3
50
120
0.8
Ω
µV
RMS
ppm
4
_______________________________________________________________________________________
Power technology
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