MAXIM MAX6138 Technical data
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 applications, 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 surfacemount 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 shuntcurrent 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.
Applications
Portable, Battery-Powered Equipment
Notebook Computers
Cell Phones
Industrial Process Control
Features
♦ Ultra-Small 3-Pin SC70 Package
♦ 0.1% (max) Initial Accuracy
♦ 25ppm/°C (max) Temperature Coefficient
Guaranteed Over -40°C to +85°C Temperature
Range
♦ Wide Operating Current Range: 60µA to 15mA
♦ Low 28µV
RMS
Output Noise (10Hz to 10kHz)
♦ 1.2205V, 2.048V, 2.5V, 3.0V, 3.3V, 4.096V, and 5.0V
Fixed Reverse Breakdown Voltages
♦ No Output Capacitors Required
♦ Stable with Capacitive Loads
MAX6138
0.1%, 25ppm, SC70 Shunt Voltage Reference
with Multiple Reverse Breakdown Voltages
________________________________________________________________ Maxim Integrated Products 1
Pin Configuration
Selector Guide
Typical Operating Circuit
19-2090; Rev 2; 4/04
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.
Ordering Information appears at end of data sheet.
PART
MAX6138_EXR12-T -40°C to +85°C 3 SC70-3 1.2205
MAX6138_EXR21-T -40°C to +85°C 3 SC70-3 2.0480
MAX6138_EXR25-T -40°C to +85°C 3 SC70-3 2.5000
MAX6138_EXR30-T -40°C to +85°C 3 SC70-3 3.0000
MAX6138_EXR33-T -40°C to +85°C 3 SC70-3 3.3000
MAX6138_EXR41-T -40°C to +85°C 3 SC70-3 4.0960
MAX6138_EXR50-T -40°C to +85°C 3 SC70-3 5.0000
TEMP
RANGE
PINPACKAGE
OUTPUT
VOLTAGE
(V)
V
S
I
+ I
SHUNT
R
I
SHUNT
S
TOP VIEW
1
+
MAX6138
-
2
SC70
*PIN 3 MUST BE LEFT FLOATING
OR CONNECTED TO PIN 2.
3 N.C.*
LOAD
I
LOAD
MAX6138
V
R
MAX6138
0.1%, 25ppm, SC70 Shunt Voltage Reference
with Multiple Reverse Breakdown Voltages
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS—MAX6138_12 (1.2205V)
(IR= 100µA, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
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.
Reverse Current (cathode to anode) ..................................20mA
Forward Current (anode to cathode) ..................................10mA
Continuous Power Dissipation (T
A
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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Reverse Breakdown Voltage
(Note 2)
Minimum Operating Current I
Reverse Voltage
Temperature Coefficient
(Notes 2, 3)
V
R
RMIN
TC 4 25 ppm/°C
TA = +25°C
MAX6138A (0.1%) 1.2193 1.2205 1.2217
MAX6138B (0.2%) 1.2181 1.2205 1.2229
MAX6138C (0.5%) 1.2144 1.2205 1.2266
45 60 µA
V
Reverse Breakdown Voltage
Change with Operating
Current Change
Reverse Dynamic
Impedance (Note 3)
Wideband Noise e
Reverse Breakdown Voltage
∆V
∆V
I
≤ IR ≤ 1mA 0.3 1.0
RMIN
/∆I
R
R
1mA ≤ IR ≤ 12mA 2.5 8.0
Z
R
N
R
IR = 1mA, f = 120Hz, IAC = 0.1I
IR = 10µA, 10Hz ≤ f ≤ 10kHz 20 µV
t = 1000h
R
0.3 0.8 Ω
120 ppm
mV
RMS
MAX6138
0.1%, 25ppm, SC70 Shunt Voltage Reference
with Multiple Reverse Breakdown Voltages
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS—MAX6138_21 (2.048V)
(IR= 100µA, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
ELECTRICAL CHARACTERISTICS—MAX6138_25 (2.5V)
(IR= 100µA, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Reverse Breakdown
Voltage (Note 2)
M i ni m um Op er ati ng C ur r ent I
Reverse Voltage
Temperature Coefficient
(Notes 2, 3)
Reverse Breakdown
Voltage Change with
Operating Current Change
Reverse Dynamic
Impedance (Note 3)
Wideband Noise e
Rever se Br eakd ow n
V ol tag e Long - Ter m S tab i l i ty
RMIN
∆V
V
R
TC 4 25 ppm/°C
/∆I
R
Z
R
N
∆V
R
TA = +25°C
I
≤ IR ≤ 1mA 0.3 1.0
RMIN
R
1mA ≤ IR ≤ 15mA 2.5 8.0
IR = 1mA, f = 120Hz, IAC = 0.1I
10Hz ≤ f ≤ 10kHz 28 µV
t = 1000h 120 ppm
MAX6138A (0.1%) 2.0460 2.0480 2.0500
MAX6138B (0.2%) 2.0439 2.0480 2.0521
MAX6138C (0.5%) 2.0378 2.0480 2.0582
45 65 µA
R
0.3 0.8 Ω
Reverse Breakdown Voltage
(Note 2)
Minimum Operating Current I
Reverse Voltage Temperature
Coefficient (Notes 2, 3)
Reverse Breakdown Voltage
Change with Operating Current
Change
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX6138A (0.1%) 2.4975 2.5000 2.5025
V
RMIN
TC 4 25 ppm/°C
∆V
R
R
/∆IRI
TA = +25°C
≤ IR ≤ 1mA 0.3 1.0 mV
RMIN
MAX6138B (0.2%) 2.4950 2.5000 2.5050
MAX6138C (0.2%) 2.4875 2.5000 2.5125
45 65 µA
V
mV
RMS
V
Rever se Br eakd ow n V ol tag e
C hang e w i th Op er ati ng C ur r ent
C hang e
Reverse Dynamic Impedance
(Note 3)
Wideband Noise e
Reverse Breakdown Voltage
Long-Term Stability
∆V
/∆IR1mA ≤ IR ≤ 15mA 2.5 8.0 mV
R
∆V
Z
IR = 1mA, f = 120Hz, IAC = 0.1I
R
10Hz ≤ f ≤ 10kHz 35 µV
N
t = 1000h 120 ppm
R
R
0.3 0.8 Ω
RMS
MAX6138
0.1%, 25ppm, SC70 Shunt Voltage Reference
with Multiple Reverse Breakdown Voltages
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS—MAX6138_30 (3.0V)
(IR= 100µA, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
ELECTRICAL CHARACTERISTICS—MAX6138_33 (3.3V)
(IR= 100µA, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX6138A (0.1%) 2.9970 3.0000 3.0030
Reverse Breakdown
Voltage (Note 2)
Minimum Operating
Current
Reverse Voltage
Temperature Coefficient
(Notes 2, 3)
V
R
I
RMIN
TC 4 25 ppm/°C
TA = +25°C
MAX6138B (0.2%) 2.9940 3.0000 3.0060
MAX6138C (0.5%) 2.9850 3.0000 3.0150
45 65 µA
V
Reverse Breakdown
Voltage Change with
Operating Current Change
Reverse Dynamic
Impedance (Note 3)
Wideband Noise e
Reverse Breakdown
Voltage Long-Term
Stability
∆V
∆V
/∆I
R
Z
R
N
R
I
≤ IR ≤ 1mA 0.3 1.0
RMIN
R
1mA ≤ IR ≤ 15mA 2.5 8.0
IR = 1mA, f =120Hz, IAC = 0.1I
10Hz ≤ f ≤ 10kHz 45 µV
t = 1000h 120 ppm
R
0.3 0.8 Ω
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX6138A (0.1%) 3.2967 3.3000 3.3033
Reverse Breakdown
Voltage (Note 2)
M i ni m um Op er ati ng C ur r ent I
Reverse Voltage
Temperature Coefficient
(Notes 2, 3)
Reverse Breakdown
Voltage Change with
Operating Current Change
Reverse Dynamic
Impedance (Note 3)
Wideband Noise e
Reverse Breakdown
Voltage Long-Term
Stability
∆V
V
R
RMIN
TC 4 25 ppm/°C
/∆I
R
Z
R
N
∆V
R
TA = +25°C
I
≤ IR ≤ 1mA 0.3 1.0
RMIN
R
1mA ≤ IR ≤ 15mA 8.0
IR = 1mA, f =120Hz, IAC = 0.1I
10Hz ≤ f ≤ 10kHz 50 µV
t = 1000h 120 ppm
MAX6138B (0.2%) 3.2934 3.3000 3.3066
MAX6138C (0.5%) 3.2835 3.3000 3.3165
45 67 µA
R
0.3 0.8 Ω
mV
RMS
V
mV
RMS
Loading...