General Description
The MAX6173–MAX6177 are low-noise, high-precision
voltage references. The devices feature a proprietary
temperature-coefficient curvature-correction circuit and
laser-trimmed thin-film resistors that result in a very low
3ppm/°C temperature coefficient and excellent ±0.06%
initial accuracy. The MAX6173–MAX6177 provide a
TEMP output where the output voltage is proportional to
the die temperature, making the devices suitable for a
wide variety of temperature-sensing applications. The
devices also provide a TRIM input, allowing fine trimming
of the output voltage with a resistive divider network. Low
temperature drift and low noise make the devices ideal
for use with high-resolution A/D or D/A converters.
The MAX6173–MAX6177 provide accurate preset +2.5V,
+3.3V, +4.096V, +5.0V, and +10V reference voltages and
accept input voltages up to +40V. The devices draw
320µA (typ) of supply current and source 30mA or sink
2mA of load current. The MAX6173–MAX6177 use
bandgap technology for low-noise performance and
excellent accuracy. The MAX6173–MAX6177 do not
require an output bypass capacitor for stability, and are
stable with capacitive loads up to 100µF. Eliminating the
output bypass capacitor saves valuable board area in
space-critical applications.
The MAX6173–MAX6177 are available in an 8-pin SO
package and operate over the automotive (-40°C to
+125°C) temperature range.
Applications
A/D Converters Voltage Regulators
D/A Converters Threshold Detectors
Digital Voltmeters
Features
♦Wide (VOUT + 2V) to +40V Supply Voltage Range
♦Excellent Temperature Stability: 3ppm/°C (max)
♦Tight Initial Accuracy: 0.05% (max)
♦Low Noise: 3.8µVP-P (typ at 2.5V Output)
♦Sources up to 30mA Output Current
♦Low Supply Current: 450µA (max at +25°C)
♦Linear Temperature Transducer Voltage Output
♦+2.5V, +3.3V, +4.096V, +5.0V, or +10V Output
Voltages
♦Wide Operating Temperature Range: -40°C to
+125°C
♦No External Capacitors Required for Stability
♦Short-Circuit Protected
MAX6173–MAX6177
High-Precision Voltage References with
Temperature Sensor
________________________________________________________________ Maxim Integrated Products 1
19-3249; Rev 1; 2/11
Pin Configuration appears at end of data sheet.
Ordering Information/Selector Guide
PART TEMP RANGE PIN-
PACKAGE
OUTPUT
VOLTAGE (V)
TEMPERATURE COEFFICIENT
(ppm/°C) -40°C TO +125°C
INITIAL
ACCURACY (%)
MAX6173AASA+ -40°C to +125°C 8 SO 2.500 3 0.06
MAX6173BASA+ -40°C to +125°C 8 SO 2.500 10 0.10
MAX6174AASA+ -40°C to +125°C 8 SO 4.096 3 0.06
MAX6174BASA+ -40°C to +125°C 8 SO 4.096 10 0.10
MAX6175AASA+ -40°C to +125°C 8 SO 5.000 3 0.06
MAX6175BASA+ -40°C to +125°C 8 SO 5.000 10 0.10
MAX6175BASA/V+ -40°C to +125°C 8 SO 5.000 10 0.10
MAX6176AASA+ -40°C to +125°C 8 SO 10.000 3 0.05
MAX6176BASA+ -40°C to +125°C 8 SO 10.000 10 0.10
MAX6177AASA+ -40°C to +125°C 8 SO 3.300 3 0.06
MAX6177BASA+ -40°C to +125°C 8 SO 3.300 10 0.10
IN
OUT
GND
*OPTIONAL.
* *
*
(VOUT + 2V) TO 40V INPUT
REFERENCE
OUTPUT
TRIM
TEMP
MAX6173–MAX6177
Typical Operating Circuit
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.
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
MAX6173–MAX6177
High-Precision Voltage References with
Temperature Sensor
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
IN to GND ...............................................................-0.3V to +42V
OUT, TRIM, TEMP to GND...........................-0.3V to (VIN + 0.3V)
Output Short Circuit to GND .....................................................5s
Continuous Power Dissipation (TA = +70°C)
8-Pin SO (derate 5.9mW/°C above +70°C) ..................471mW
Operating Temperature Range ........................-40°C to +125°C
Junction Temperature .....................................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
Soldering Temperature (reflow) ......................................+260°C
ELECTRICAL CHARACTERISTICS—MAX6173 (VOUT = 2.5V)
(VIN = +5V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUT
MAX6173A (0.06%) 2.4985 2.5 2.5015
Output Voltage VOUT No load, TA = +25°CMAX6173B (0.1%) 2.4975 2.5 2.5025 V
Output Adjustment Range ΔVTRIM RPOT = 10kΩ±3±6%
MAX6173AASA 1.5 3Output-Voltage
Temperature Coefficient
(Note 2)
TCVOUT TA = -40°C to +125°C
MAX6173BASA 3 10
ppm/°C
TA = +25°C 0.6 5
Line Regulation (Note 3) ΔVOUT / ΔVIN 4.5V ≤ VIN ≤ 40V TA = -40°C to +125°C 0.8 10 ppm/V
TA = +25°C210
Sourcing:
0 ≤ IOUT ≤ 10mA TA = -40°C to +125°C215
TA = +25°C 50 500
Load Regulation (Note 3) ΔVOUT /
ΔIOUT Sinking:
-0.6mA ≤ IOUT ≤ 0 TA = -40°C to +125°C 90 900
ppm/mA
OUT shorted to GND 60
Output Short-Circuit
Current ISC OUT shorted to IN 3 mA
Temperature Hysteresis
(Note 4)
ΔVOUT/
cycle 120 ppm
Long-Term Stability ΔVOUT/
time 1000 hours at TA = +25°C 50 ppm
DYNAMIC
f = 0.1Hz to 10Hz 3.8 µVP-P
Noise Voltage eOUT f = 10Hz to 1kHz 6.8 µVRMS
Turn-On Settling Time tRTo VOUT = 0.1% of final value, COUT = 50pF 150 µs
INPUT
Supply Voltage Range VIN Guaranteed by line regulation test 4.5 40.0 V
TA = +25°C 300 450
Quiescent Supply Current IIN No load TA = -40°C to +125°C 600 µA
TEMP OUTPUT
TEMP Output Voltage VTEMP 570 mV
TEMP Temperature
Coefficient TCTEMP 1.9 mV/°C
MAX6173–MAX6177
High-Precision Voltage References with
Temperature Sensor
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS—MAX6177 (VOUT = 3.3V)
(VIN = +10V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUT
MAX6177A (0.06%) 3.2980 3.3 3.3020
Output Voltage VOUT No load, TA = +25°CMAX6177B (0.1%) 3.2967 3.3 3.3033 V
Output Adjustment Range ΔVTRIM RPOT = 10kΩ±3±6%
MAX6177AASA 1.5 3
Output-Voltage
Temperature Coefficient
(Note 2)
TCVOUT TA = -40°C to +125°C
MAX6177BASA 3 10
ppm/°C
TA = +25°C 0.6 5
Line Regulation (Note 3) ΔVOUT /
ΔVIN 5.3V ≤ VIN ≤ 40V TA = -40°C to +125°C 0.8 10 ppm/V
TA = +25°C210
Sourcing:
0 ≤ IOUT ≤ 10mA TA = -40°C to +125°C215
TA = +25°C 50 500
Load Regulation (Note 3) ΔVOUT /
ΔIOUT Sinking:
-0.6mA ≤ IOUT ≤ 0 TA = -40°C to +125°C 90 900
ppm/
mA
OUT shorted to GND 60
Output Short-Circuit Current ISC OUT shorted to IN 3 mA
Temperature Hysteresis
(Note 4)
ΔVOUT/
cycle 120 ppm
Long-Term Stability ΔVOUT/
time 1000 hours at TA = +25°C 50 ppm
DYNAMIC
f = 0.1Hz to 10Hz 5 µVP-P
Noise Voltage eOUT f = 10Hz to 1kHz 9.3 µVRMS
Turn-On Settling Time tRTo VOUT = 0.1% of final value, COUT = 50pF 180 µs
INPUT
Supply Voltage Range VIN Guaranteed by line regulation test 5.3 40.0 V
TA = +25°C 320 500
Quiescent Supply Current IIN No load TA = -40°C to +125°C 650 µA
TEMP OUTPUT
TEMP Output Voltage VTEMP 630 mV
TEMP Temperature
Coefficient TCTEMP 2.1 mV/°C
MAX6173–MAX6177
High-Precision Voltage References with
Temperature Sensor
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS—MAX6174 (VOUT = 4.096V)
(VIN = +10V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUT
MAX6174A (0.06%) 4.0935 4.096 4.0985
Output Voltage VOUT No load, TA = +25°CMAX6174B (0.1%) 4.0919 4.096 4.1001 V
Output Adjustment Range ΔVTRIM RPOT = 10kΩ±3±6%
MAX6174AASA 1.5 3
Output-Voltage Temperature
Coefficient (Note 2) TCVOUT TA = -40°C to +125°CMAX6174BASA 3 10 ppm/°C
TA = +25°C 0.6 5
Line Regulation (Note 3) ΔVOUT/
ΔVIN 6.1V ≤ VIN ≤ 40V TA = -40°C to +125°C 0.8 10 ppm/V
TA = +25°C210
Sourcing:
0 ≤ IOUT ≤ 10mA TA = -40°C to +125°C215
TA = +25°C 50 500
Load Regulation (Note 3) ΔVOUT/
ΔIOUT Sinking:
-0.6mA ≤ IOUT ≤ 0 TA = -40°C to +125°C 90 900
ppm/mA
OUT shorted to GND 60
Output Short-Circuit Current ISC OUT shorted to IN 3 mA
Temperature Hysteresis
(Note 4)
ΔVOUT/
cycle 120 ppm
Long-Term Stability ΔVOUT/
time 1000 hours at TA = +25°C 50 ppm
DYNAMIC
f = 0.1Hz to 10Hz 7 µVP-P
Noise Voltage eOUT f = 10Hz to 1kHz 11.5 µVRMS
Turn-On Settling Time tRTo VOUT = 0.1% of final value, COUT = 50pF 200 µs
INPUT
Supply Voltage Range VIN Guaranteed by line regulation test 6.1 40.0 V
TA = +25°C 320 500
Quiescent Supply Current IIN No load TA = -40°C to +125°C 650 µA
TEMP OUTPUT
TEMP Output Voltage VTEMP 630 mV
TEMP Temperature
Coefficient TCTEMP 2.1 mV/°C
MAX6173–MAX6177
High-Precision Voltage References with
Temperature Sensor
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS—MAX6175 (VOUT = 5.0V)
(VIN = +15V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUT
MAX6175A (0.06%) 4.9970 5.0 5.0030
Output Voltage VOUT No load, TA = +25°CMAX6175B (0.1%) 4.9950 5.0 5.0050 V
Output Adjustment Range ΔVTRIM RPOT = 10kΩ±3±6%
MAX6175AASA 1.5 3Output-Voltage
Temperature Coefficient
(Note 2)
TCVOUT TA = -40°C to +125°C
MAX6175BASA 3 10
ppm/°C
TA = +25°C 0.6 5
Line Regulation (Note 3) ΔVOUT /
ΔVIN 7V ≤ VIN ≤ 40V TA = -40°C to +125°C 0.8 10 ppm/V
TA = +25°C210
Sourcing:
0 ≤ IOUT ≤ 10mA TA = -40°C to +125°C215
TA = +25°C 50 500
Load Regulation (Note 3) ΔVOUT /
ΔIOUT Sinking:
-0.6mA ≤ IOUT ≤ 0 TA = -40°C to +125°C 90 900
ppm/mA
OUT shorted to GND 60
Output Short-Circuit Current ISC OUT shorted to IN 3 mA
Temperature Hysteresis
(Note 4)
ΔVOUT/
cycle 120 ppm
Long-Term Stability ΔVOUT/
time 1000 hours at TA = +25°C 50 ppm
DYNAMIC
f = 0.1Hz to 10Hz 9 µVP-P
Noise Voltage eOUT f = 10Hz to 1kHz 14.5 µVRMS
Turn-On Settling Time tRTo VOUT = 0.1% of final value, COUT = 50pF 230 µs
INPUT
Supply Voltage Range VIN Guaranteed by line regulation test 7.0 40.0 V
TA = +25°C 320 550
Quiescent Supply Current IIN No load TA = -40°C to +125°C 700 µA
TEMP OUTPUT
TEMP Output Voltage VTEMP 630 mV
TEMP Temperature
Coefficient TCTEMP 2.1 mV/°C
MAX6173–MAX6177
High-Precision Voltage References with
Temperature Sensor
6 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS—MAX6176 (VOUT = 10V)
(VIN = +15V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUT
MAX6176A (0.05%) 9.9950 10.0 10.0050
Output Voltage VOUT No load, TA = +25°CMAX6176B (0.1%) 9.9900 10.0 10.0100 V
Output Adjustment Range ΔVTRIM RPOT = 10kΩ±3±6%
MAX6176AASA 1.5 3Output-Voltage
Temperature Coefficient
(Note 2)
TCVOUT TA = -40°C to +125°C
MAX6176BASA 3 10
p p m /° C
TA = +25°C 0.6 5
Line Regulation (Note 3) ΔVOUT/
ΔVIN 12V ≤ VIN ≤ 40V TA = -40°C to +125°C 0.8 10 ppm/V
TA = +25°C210
Sourcing:
0 ≤ IOUT ≤ 10mA TA = -40°C to +125°C215
TA = +25°C 50 500
Load Regulation (Note 3) ΔVOUT/
ΔIOUT Sinking:
-0.6mA ≤ IOUT ≤ 0 TA = -40°C to +125°C90 900
p p m /m A
OUT shorted to GND 60
Output Short-Circuit
Current ISC OUT shorted to IN 3 mA
Temperature Hysteresis
(Note 4)
ΔVOUT/
cycle 120 ppm
Long-Term Stability ΔVOUT/
time 1000 hours at TA = +25°C 50 ppm
DYNAMIC
f = 0.1Hz to 10Hz 18 µVP-P
Noise Voltage eOUT f = 10Hz to 1kHz 29 µVRMS
Turn-On Settling Time tRTo VOUT = 0.1% of final value, COUT = 50pF 400 µs
INPUT
Supply Voltage Range VIN Guaranteed by line regulation test 12.0 40.0 V
TA = +25°C 340 550
Quiescent Supply Current IIN No load TA = -40°C to +125°C 700 µA
TEMP OUTPUT
TEMP Output Voltage VTEMP 630 mV
TEMP Temperature
Coefficient TCTEMP 2.1 mV/°C
Note 1: All devices are 100% production tested at TA= +25°C and guaranteed by design over TA= TMIN to TMAX, as specified.
Note 2: Temperature coefficient is defined as ΔVOUT divided by the temperature range.
Note 3: Line and load regulation specifications do not include the effects of self-heating.
Note 4: Thermal hysteresis is defined as the change in +25°C output voltage before and after cycling the device from TMAX to TMIN.
Typical Operating Characteristics
(VIN = +5V for VOUT = +2.5V, VIN = +15V for VOUT = +10V, IOUT = 0, TA= +25°C, unless otherwise noted.)
MAX6173–MAX6177
High-Precision Voltage References with
Temperature Sensor
_______________________________________________________________________________________ 7
2.498
2.500
2.499
2.501
2.502
OUTPUT VOLTAGE vs. TEMPERATURE
(VOUT = 2.5V)
MAX6173 toc01
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
-50 25 50-25 0 75 100 125
THREE TYPICAL PARTS
9.993
9.998
9.995
10.001
9.999
9.996
10.002
9.997
9.994
10.000
10.003
OUTPUT VOLTAGE vs. TEMPERATURE
(VOUT = 10V)
MAX6173 toc02
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
-50 25 50-25 0 75 100 125
THREE TYPICAL PARTS
0.50
0.25
0
-0.25
-0.50
015510 202530
LOAD REGULATION vs.
SOURCE CURRENT (VOUT = 2.5V)
MAX6173 toc03
SOURCE CURRENT (mA)
OUTPUT VOLTAGE CHANGE (mV)
TA = -40°C
TA = +125°C
TA = +25°C
0.50
0.25
0
-0.25
-0.50
015510 202530
LOAD REGULATION
vs. SOURCE CURRENT (VOUT = 10V)
MAX6173 toc04
SOURCE CURRENT (mA)
OUTPUT VOLTAGE CHANGE (mV)
TA = +25°C
TA = +125°C
TA = -40°C
1.00
0.75
0.50
0.25
-0.25
0
-0.50
01.00.5 1.5 2.0
LOAD REGULATION
vs. SINK CURRENT (VOUT = 2.5V)
MAX6173 toc05
SINK CURRENT (mA)
OUTPUT VOLTAGE CHANGE (mV)
TA = +25°C
TA = +125°C
TA = -40°C
2.0
1.5
1.0
0.5
-0.5
0
-1.0
01.00.5 1.5 2.0
LOAD REGULATION
vs. SINK CURRENT (VOUT = 10V)
MAX6173 toc06
SINK CURRENT (mA)
OUTPUT VOLTAGE CHANGE (mV)
TA = -40°C
TA = +125°C
TA = +25°C
0
60
20
40
80
100
LINE REGULATION vs. TEMPERATURE
(VOUT = 2.5V)
MAX6173 toc07
INPUT VOLTAGE (V)
OUTPUT VOLTAGE CHANGE (μV)
020255 1015 303540
TA = -40°C
TA = +125°C
TA = +25°C
0
150
50
100
200
250
300
LINE REGULATION vs. TEMPERATURE
(VOUT = 10V)
MAX6173 toc08
INPUT VOLTAGE (V)
OUTPUT VOLTAGE CHANGE (μV)
12 28 3216 20 24 36 40
TA = -40°C
TA = +125°C
TA = +25°C
0.5
1.5
1.0
2.0
2.5
MINIMUM INPUT-OUTPUT DIFFERENTIAL
vs. SOURCE CURRENT (VOUT = 2.5V)
MAX6173 toc09
SOURCE CURRENT (mA)
DROPOUT VOLTAGE (V)
0121648 20
TA = -40°C
TA = +125°C
TA = +25°C
Typical Operating Characteristics (continued)
(VIN = +5V for VOUT = +2.5V, VIN = +15V for VOUT = +10V, IOUT = 0, TA= +25°C, unless otherwise noted.)
MAX6173–MAX6177
High-Precision Voltage References with
Temperature Sensor
8 _______________________________________________________________________________________
0.5
1.5
1.0
2.0
2.5
MINIMUM INPUT-OUTPUT DIFFERENTIAL
vs. SOURCE CURRENT (VOUT = 10V)
MAX6173 toc10
SOURCE CURRENT (mA)
DROPOUT VOLTAGE (V)
0121648 20
TA = -40°C
TA = +125°C
TA = +25°C
-140
-100
-120
-60
-80
-20
-40
0
0.001 0.1 10.01 10 100 1000
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (VOUT = 2.5V)
MAX6173 toc11
FREQUENCY (kHz)
PSRR (dB)
-120
-100
-60
-80
-20
-40
0
0.001 0.1 10.01 10 100 1000
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (VOUT = 10V)
MAX6173 toc12
FREQUENCY (kHz)
PSRR (dB)
0.001
0.1
0.01
10
1
100
0.1 10.01 10 100 1000
OUTPUT IMPEDANCE vs. FREQUENCY
(VOUT = 2.5V)
MAX6173 toc13
FREQUENCY (kHz)
OUTPUT IMPEDANCE (Ω)
0
100
50
200
150
250
300
350
400
010155 2025303540
SUPPLY CURRENT vs. INPUT VOLTAGE
(VOUT = 2.5V)
MAX6173 toc14
INPUT VOLTAGE (V)
SUPPLY CURRENT (μA)
TA = -40°C
TA = +125°C
TA = +25°C
0
100
50
200
150
250
300
350
400
010155 2025303540
SUPPLY CURRENT vs. INPUT VOLTAGE
(VOUT = 10V)
MAX6173 toc15
INPUT VOLTAGE (V)
SUPPLY CURRENT (μA)
TA = -40°C
TA = +125°C
TA = +25°C
250
300
275
325
350
-50 -25 0 25 50 75 100 125
SUPPLY CURRENT vs. TEMPERATURE
(VOUT = 2.5V)
MAX6173 toc16
TEMPERATURE (°C)
SUPPLY CURRENT (μA)
250
325
300
275
350
375
-50 -25 0 25 50 75 100 125
SUPPLY CURRENT vs. TEMPERATURE
(VOUT = 10V)
MAX6173 toc17
TEMPERATURE (°C)
SUPPLY CURRENT (μA)
400
600
500
700
800
-50 -25 0 25 50 75 100 125
TEMP VOLTAGE
vs. TEMPERATURE (VOUT = 2.5V)
MAX6173 toc18
TEMPERATURE (°C)
TEMP VOLTAGE (mV)
Typical Operating Characteristics (continued)
(VIN = +5V for VOUT = +2.5V, VIN = +15V for VOUT = +10V, IOUT = 0, TA= +25°C, unless otherwise noted.)
MAX6173–MAX6177
High-Precision Voltage References with
Temperature Sensor
_______________________________________________________________________________________ 9
400
600
500
800
700
900
-50 -25 0 25 50 75 100 125
TEMP VOLTAGE
vs. TEMPERATURE (VOUT = 10V)
MAX6173 toc19
TEMPERATURE (°C)
TEMP VOLTAGE (mV)
2.35
2.50
2.45
2.40
2.60
2.55
2.65
0 0.5 1.0 1.5 2.0 2.5
OUTPUT VOLTAGE
vs. TRIM VOLTAGE (VOUT = 2.5V)
MAX6173 toc20
TRIM VOLTAGE (V)
OUTPUT VOLTAGE (V)
2.498
2.500
2.499
2.501
2.502
0 200 400 600 800 1000
LONG-TERM STABILITY vs. TIME
(VOUT = 2.500V)
MAX6173 toc21
TIME (hours)
VOUT (V)
TWO TYPICAL PARTS
9.998
10.000
9.999
10.001
10.002
0 200 400 600 800 1000
LONG-TERM STABILITY vs. TIME
(VOUT = 10.0V)
MAX6173 toc22
TIME (hours)
VOUT (V)
TWO TYPICAL PARTS
1000
100
OUTPUT-VOLTAGE NOISE DENSITY
vs. FREQUENCY (VOUT = 2.5V)
MAX6173 toc23
FREQUENCY (Hz)
OUTPUT VOLTAGE-NOISE DENSITY (nV/√Hz)
0.1 100 1000110
10,000
1000
100
OUTPUT-VOLTAGE NOISE DENSITY
vs. FREQUENCY (VOUT = 10V)
MAX6173 toc24
FREQUENCY (Hz)
OUTPUT VOLTAGE-NOISE DENSITY (nV/√Hz)
0.1 100 1000110
0.1Hz TO 10Hz OUTPUT NOISE
(VOUT = 2.5V)
MAX6173 toc25
1μV/div
1s/div
0.1Hz TO 10Hz OUTPUT NOISE
(VOUT = 10V)
MAX6173 toc26
4μV/div
1s/div
Typical Operating Characteristics (continued)
(VIN = +5V for VOUT = +2.5V, VIN = +15V for VOUT = +10V, IOUT = 0, TA= +25°C, unless otherwise noted.)
MAX6173–MAX6177
High-Precision Voltage References with
Temperature Sensor
10 ______________________________________________________________________________________
LOAD TRANSIENT
(VOUT = 2.5V, COUT = 0, 0 TO 20mA)
MAX6173 toc27
IOUT
VOUT
AC-COUPLED
1V/div
0
20mA
10μs/div
LOAD TRANSIENT
(VOUT = 10V, COUT = 0, 0 TO 20mA)
MAX6173 toc28
IOUT
VOUT
AC-COUPLED
1V/div
0
20mA
10μs/div
LOAD TRANSIENT
(VOUT = 2.5V, COUT = 1μF, 0 TO +20mA)
MAX6173 toc29
IOUT
VOUT
AC-COUPLED
50mV/div
0
20mA
200μs/div
LOAD TRANSIENT
(VOUT = 10V, COUT = 1μF, 0 TO 20mA)
MAX6173 toc30
IOUT
VOUT
AC-COUPLED
100mV/div
0
20mA
100μs/div
LOAD TRANSIENT
(VOUT = 2.5V, COUT = 0, 0 TO -2mA)
MAX6173 toc31
IOUT
VOUT
AC-COUPLED
200mV/div
0
-2mA
40μs/div
LOAD TRANSIENT
(VOUT = 10V, COUT = 0, 0 TO -2mA)
MAX6173 toc32
IOUT
VOUT
AC-COUPLED
20mV/div
0
-2mA
200μs/div
Typical Operating Characteristics (continued)
(VIN = +5V for VOUT = +2.5V, VIN = +15V for VOUT = +10V, IOUT = 0, TA= +25°C, unless otherwise noted.)
MAX6173–MAX6177
High-Precision Voltage References with
Temperature Sensor
______________________________________________________________________________________ 11
LOAD TRANSIENT
(VOUT = 2.5V, COUT = 1μF, 0 TO -2mA)
MAX6173 toc33
IOUT
VOUT
AC-COUPLED
20mV/div
0
-2mA
400μs/div
LOAD TRANSIENT
(VOUT = 10V, COUT = 1μF, 0 TO -2mA)
MAX6173 toc34
IOUT
VOUT
AC-COUPLED
5mV/div
0
-2mA
400μs/div
LINE TRANSIENT
(VOUT = 2.5V)
MAX6173 toc35
VIN
VOUT
AC-COUPLED
200mV/div
5.5V
4.5V
10μs/div
COUT = 0
LINE TRANSIENT
(VOUT = 10V)
MAX6173 toc36
VIN
1V/div
VOUT
AC-COUPLED
200mV/div
15.5V
14.5V
2μs/div
TURN-ON TRANSIENT
(VOUT = 2.5V, COUT = 0)
MAX6173 toc37
VIN
2V/div
VOUT
1V/div
GND
GND
10μs/div
COUT = 0
TURN-ON TRANSIENT
(VOUT = 2.5V, COUT = 1μF)
MAX6173 toc38
VIN
2V/div
VOUT
1V/div
GND
GND
40μs/div
MAX6173–MAX6177
High-Precision Voltage References with
Temperature Sensor
12 ______________________________________________________________________________________
Detailed Description
The MAX6173–MAX6177 precision voltage references
provide accurate preset +2.5V, +3.3V, +4.096V, +5.0V,
and +10V reference voltages from up to +40V input volt-
ages. These devices feature a proprietary temperature-
coefficient curvature-correction circuit and laser-trimmed
thin-film resistors that result in a very low 3ppm/°C tem-
perature coefficient and excellent 0.05% initial accuracy.
The MAX6173–MAX6177 draw 340µA of supply current
and source 30mA or sink 2mA of load current.
Trimming the Output Voltage
Trim the factory-preset output voltage on the
MAX6173–MAX6177 by placing a resistive divider net-
work between OUT, TRIM, and GND.
Use the following formula to calculate the change in
output voltage from its preset value:
ΔVOUT = 2 x (VTRIM - VTRIM (open)) x k
where:
VTRIM = 0V to VOUT
VTRIM (open) = VOUT (nominal) / 2 (typ)
k = ±6% (typ)
For example, use a 50kΩpotentiometer (such as the
MAX5436) between OUT, TRIM, and GND with the
potentiometer wiper connected to TRIM (see Figure 2).
As the TRIM voltage changes from VOUT to GND, the
output voltage changes accordingly. Set R2 to 1MΩor
less. Currents through resistors R1 and R2 add to the
quiescent supply current.
Typical Operating Characteristics (continued)
(VIN = +5V for VOUT = +2.5V, VIN = +15V for VOUT = +10V, IOUT = 0, TA= +25°C, unless otherwise noted.)
TURN-ON TRANSIENT
(VOUT = 10V, COUT = 0)
MAX6173 toc39
VIN
5V/div
VOUT
5V/div
GND
GND
100μs/div
TURN-ON TRANSIENT
(VOUT = 10V, COUT = 1μF)
MAX6173 toc40
VIN
5V/div
VOUT
5V/div
GND
GND
200μs/div
PIN NAME FUNCTION
1, 8 I.C. Internally Connected. Do not connect externally.
2 IN Positive Power-Supply Input
3 TEMP Temperature Proportional Output Voltage. TEMP generates an output voltage proportional to the die
temperature.
4 GND Ground
5 TRIM Output Voltage Trim. Connect TRIM to the center of a voltage-divider between OUT and GND for
trimming. Leave unconnected to use the preset output voltage.
6 OUT Output Voltage
7 N.C. No Connection. Not internally connected.
Pin Description
MAX6173–MAX6177
High-Precision Voltage References with
Temperature Sensor
______________________________________________________________________________________ 13
Temp Output
The MAX6173–MAX6177 provide a temperature output
proportional to die temperature. TEMP can be calculated
from the following formula:
TEMP (V) = TJ(°K) x n
where TJ= the die temperature,
n = the temperature multiplier,
TA= the ambient temperature.
Self-heating affects the die temperature and conversely,
the TEMP output. The TEMP equation assumes the output
is not loaded. If device power dissipation is negligible,
then TJ≈TA.
Applications Information
Bypassing/Output Capacitance
For the best line-transient performance, decouple the
input with a 0.1µF ceramic capacitor as shown in the
Typical Operating Circuit. Place the capacitor as close
to IN as possible. When transient performance is less
important, no capacitor is necessary.
The MAX6173–MAX6177 do not require an output
capacitor for stability and are stable with capacitive
loads up to 100µF. In applications where the load or the
supply can experience step changes, a larger output
capacitor reduces the amount of overshoot (under-
shoot) and improves the circuit’s transient response.
Place output capacitors as close to the devices as pos-
sible for best performance.
Supply Current
The MAX6173–MAX6177 consume 320µA (typ) of qui-
escent supply current. This improved efficiency
reduces power dissipation and extends battery life.
Thermal Hysteresis
Thermal hysteresis is the change in the output voltage
at TA= +25°C before and after the device is cycled
over its entire operating temperature range. Hysteresis
is caused by differential package stress appearing
across the bandgap core transistors. The typical ther-
mal hysteresis value is 120ppm.
Turn-On Time
The MAX6173–MAX6177 typically turn on and settle to
within 0.1% of the preset output voltage in 150µs (2.5V
output). The turn-on time can increase up to 150µs with
the device operating with a 1µF load.
Short-Circuited Outputs
The MAX6173–MAX6177 feature a short-circuit-protected
output. Internal circuitry limits the output current to
60mA when short circuiting the output to ground. The
output current is limited to 3mA when short circuiting
the output to the input.
nVatTT
TmV K
TEMP J
( )
./==≅°
0
0
19
TEMPERATURE
COEFFICIENT
(ppm/°C)
110 100
16-BIT
14-BIT
12-BIT
10-BIT
8-BIT
0.01
0.1
10
100
1000
1
10,000
18-BIT
20-BIT
OPERATING TEMPERATURE RANGE (TMAX - TMIN) (°C)
Figure 1. Temperature Coefficient vs. Operating Temperature Range for a 1 LSB Maximum Error
MAX6173–MAX6177
High-Precision Voltage References with
Temperature Sensor
14 ______________________________________________________________________________________
Package Information
(For the latest package outline information and land
patterns (footprints), go to www.maxim-ic.com/packages.
Note that a “+”, “#”, or “-” in the package code indi-
cates RoHS status only. Package drawings may show a
different suffix character, but the drawing pertains to
the package regardless of RoHS status.
Temperature Coefficient vs. Operating
Temperature Range for a
1 LSB Maximum Error
In a data converter application, the reference voltage
of the converter must stay within a certain limit to keep
the error in the data converter smaller than the resolu-
tion limit through the operating temperature range.
Figure 1 shows the maximum allowable reference-volt-
age temperature coefficient to keep the conversion
error to less than 1 LSB, as a function of the operating
temperature range (TMAX - TMIN) with the converter
resolution as a parameter. The graph assumes the ref-
erence-voltage temperature coefficient as the only
parameter affecting accuracy.
In reality, the absolute static accuracy of a data con-
verter is dependent on the combination of many para-
meters such as integral nonlinearity, differential
nonlinearity, offset error, gain error, as well as voltage-
reference changes.
IN
OUT
GND
*OPTIONAL.
*
( VOUT + 2V) TO 40V INPUT
REFERENCE
OUTPUT
MAX5436
50kΩ
POTENTIOMETER
TRIM
TEMP
MAX6173–MAX6177
Figure 2. Applications Circuit Using the MAX5436 Potentiometer
Chip Information
TRANSISTOR COUNT: 429
PROCESS: BiCMOS
OUT
TRIMGND
*INTERNALLY CONNECTED. DO NOT CONNECT.
1
2
8
7
I.C.*
N.C.IN
TEMP
I.C.*
SO
TOP VIEW
3
4
6
5
MAX6173–
MAX6177
Pin Configuration
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
8 SO S8+2 21-0041 90-0096
MAX6173–MAX6177
High-Precision Voltage References with
Temperature Sensor
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15
© 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 6/04 Initial release —
1 2/11 Added automotive grade part, lead-free information, and soldering
temperature 1, 2
