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19-3249; Rev 0; 5/04
High-Precision Voltage References with Temperature Sensor
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 320A (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 100F. 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 (-40C to +125C) temperature range.
Features
Wide (VOUT + 2V) to +40V Supply Voltage Range Excellent Temperature Stability: 3ppm/C (max) Tight Initial Accuracy: 0.05% (max) Low Noise: 3.8VP-P (typ at 2.5V Output) Sources up to 30mA Output Current Low Supply Current: 450A (max at +25C) Linear Temperature Transducer Voltage Output +2.5V, +3.3V, +4.096V, +5.0V, or +10V Output Voltages Wide Operating Temperature Range: -40C to +125C No External Capacitors Required for Stability Short-Circuit Protected
MAX6173-MAX6177
Typical Operating Circuit
(VOUT + 2V) TO 40V INPUT
IN OUT REFERENCE OUTPUT
*
MAX6173-MAX6177 TEMP GND TRIM
*
Applications
A/D Converters D/A Converters Digital Voltmeters Voltage Regulators Threshold Detectors
*OPTIONAL.
*
Pin Configuration appears at end of data sheet.
Ordering Information/Selector Guide
PART MAX6173AASA MAX6173BASA MAX6174AASA MAX6174BASA MAX6175AASA MAX6175BASA MAX6176AASA MAX6176BASA MAX6177AASA MAX6177BASA TEMP RANGE -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C PINPACKAGE 8 SO 8 SO 8 SO 8 SO 8 SO 8 SO 8 SO 8 SO 8 SO 8 SO OUTPUT VOLTAGE (V) 2.500 2.500 4.096 4.096 5.000 5.000 10.000 10.000 3.300 3.300 TEMPERATURE COEFFICIENT (ppm/C) -40C TO +125C 3 10 3 10 3 10 3 10 3 10 INITIAL ACCURACY (%) 0.06 0.10 0.06 0.10 0.06 0.10 0.05 0.10 0.06 0.10
________________________________________________________________ Maxim Integrated Products
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High-Precision Voltage References with Temperature Sensor MAX6173-MAX6177
ABSOLUTE MAXIMUM RATINGS
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 = +70C) 8-Pin SO (derate 5.9mW/C above +70C) ..................471mW Operating Temperature Range ........................-40C to +125C Junction Temperature .....................................................+150C Storage Temperature Range ............................-65C to +150C Lead Temperature (soldering, 10s) ................................+300C
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--MAX6173 (VOUT = 2.5V)
(VIN = +5V, TA = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER OUTPUT Output Voltage Output Adjustment Range Output-Voltage Temperature Coefficient (Note 2) Line Regulation (Note 3) VOUT VTRIM TCVOUT No load, TA = +25C RPOT = 10k MAX6173AASA TA = -40C to +125C MAX6173BASA VOUT / VIN 4.5V VIN 40V Sourcing: 0 IOUT 10mA Sinking: -0.6mA IOUT 0 OUT shorted to GND OUT shorted to IN TA = +25C TA = -40C to +125C TA = +25C TA = -40C to +125C TA = +25C TA = -40C to +125C 3 0.6 0.8 2 2 50 90 60 3 120 1000 hours at TA = +25C 50 10 5 10 10 15 500 900 mA ppm ppm ppm/mA ppm/V MAX6173A (0.06%) MAX6173B (0.1%) 2.4985 2.4975 3 2.5 2.5 6 1.5 3 ppm/C 2.5015 2.5025 V % SYMBOL CONDITIONS MIN TYP MAX UNITS
Load Regulation (Note 3)
VOUT / IOUT
Output Short-Circuit Current Temperature Hysteresis (Note 4) Long-Term Stability DYNAMIC Noise Voltage Turn-On Settling Time INPUT Supply Voltage Range Quiescent Supply Current TEMP OUTPUT TEMP Output Voltage TEMP Temperature Coefficient
ISC VOUT/ cycle VOUT/ time
eOUT tR VIN IIN
f = 0.1Hz to 10Hz f = 10Hz to 1kHz To VOUT = 0.1% of final value, COUT = 50pF Guaranteed by line regulation test No load TA = +25C TA = -40C to +125C 4.5
3.8 6.8 150 40.0 300 450 600 570 1.9
VP-P VRMS s V A
VTEMP TCTEMP
mV mV/C
2
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High-Precision Voltage References with Temperature Sensor MAX6173-MAX6177
ELECTRICAL CHARACTERISTICS--MAX6177 (VOUT = 3.3V)
(VIN = +10V, TA = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER OUTPUT Output Voltage Output Adjustment Range Output-Voltage Temperature Coefficient (Note 2) Line Regulation (Note 3) VOUT VTRIM TCVOUT VOUT / VIN VOUT / IOUT No load, TA = +25C RPOT = 10k MAX6177AASA TA = -40C to +125C MAX6177BASA 5.3V VIN 40V Sourcing: 0 IOUT 10mA Sinking: -0.6mA IOUT 0 OUT shorted to GND OUT shorted to IN TA = +25C TA = -40C to +125C TA = +25C TA = -40C to +125C TA = +25C TA = -40C to +125C 3 0.6 0.8 2 2 50 90 60 3 120 1000 hours at TA = +25C 50 10 5 10 10 15 500 900 mA ppm ppm ppm/ mA ppm/V MAX6177A (0.06%) MAX6177B (0.1%) 3.2980 3.2967 3 3.3 3.3 6 1.5 3 ppm/C 3.3020 3.3033 V % SYMBOL CONDITIONS MIN TYP MAX UNITS
Load Regulation (Note 3)
Output Short-Circuit Current Temperature Hysteresis (Note 4) Long-Term Stability DYNAMIC Noise Voltage Turn-On Settling Time INPUT Supply Voltage Range Quiescent Supply Current TEMP OUTPUT TEMP Output Voltage TEMP Temperature Coefficient
ISC VOUT/ cycle VOUT/ time
eOUT tR VIN IIN
f = 0.1Hz to 10Hz f = 10Hz to 1kHz To VOUT = 0.1% of final value, COUT = 50pF Guaranteed by line regulation test No load TA = +25C TA = -40C to +125C 5.3
5 9.3 180 40.0 320 500 650 630 2.1
VP-P VRMS s V A
VTEMP TCTEMP
mV mV/C
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High-Precision Voltage References with Temperature Sensor MAX6173-MAX6177
ELECTRICAL CHARACTERISTICS--MAX6174 (VOUT = 4.096V)
(VIN = +10V, TA = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER OUTPUT Output Voltage Output Adjustment Range Output-Voltage Temperature Coefficient (Note 2) Line Regulation (Note 3) VOUT VTRIM TCVOUT VOUT/ VIN VOUT/ IOUT No load, TA = +25C RPOT = 10k TA = -40C to +125C 6.1V VIN 40V Sourcing: 0 IOUT 10mA Sinking: -0.6mA IOUT 0 OUT shorted to GND OUT shorted to IN MAX6174AASA MAX6174BASA TA = +25C TA = -40C to +125C TA = +25C TA = -40C to +125C TA = +25C TA = -40C to +125C MAX6174A (0.06%) MAX6174B (0.1%) 4.0935 4.0919 3 4.096 4.096 6 1.5 3 0.6 0.8 2 2 50 90 60 3 120 1000 hours at TA = +25C 50 3 10 5 10 10 15 500 900 mA ppm ppm ppm/mA 4.0985 4.1001 V % ppm/C ppm/V SYMBOL CONDITIONS MIN TYP MAX UNITS
Load Regulation (Note 3)
Output Short-Circuit Current Temperature Hysteresis (Note 4) Long-Term Stability DYNAMIC Noise Voltage Turn-On Settling Time INPUT Supply Voltage Range Quiescent Supply Current TEMP OUTPUT TEMP Output Voltage TEMP Temperature Coefficient
ISC VOUT/ cycle VOUT/ time
eOUT tR VIN IIN
f = 0.1Hz to 10Hz f = 10Hz to 1kHz To VOUT = 0.1% of final value, COUT = 50pF Guaranteed by line regulation test No load TA = +25C TA = -40C to +125C 6.1
7 11.5 200 40.0 320 500 650 630 2.1
VP-P VRMS s V A
VTEMP TCTEMP
mV mV/C
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High-Precision Voltage References with Temperature Sensor
ELECTRICAL CHARACTERISTICS--MAX6175 (VOUT = 5.0V)
(VIN = +15V, TA = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER OUTPUT Output Voltage Output Adjustment Range Output-Voltage Temperature Coefficient (Note 2) Line Regulation (Note 3) VOUT VTRIM TCVOUT VOUT / VIN VOUT / IOUT No load, TA = +25C RPOT = 10k MAX6175AASA TA = -40C to +125C MAX6175BASA 7V VIN 40V Sourcing: 0 IOUT 10mA Sinking: -0.6mA IOUT 0 OUT shorted to GND OUT shorted to IN TA = +25C TA = -40C to +125C TA = +25C TA = -40C to +125C TA = +25C TA = -40C to +125C 3 0.6 0.8 2 2 50 90 60 3 120 1000 hours at TA = +25C 50 10 5 10 10 15 500 900 mA ppm ppm ppm/mA ppm/V MAX6175A (0.06%) MAX6175B (0.1%) 4.9970 4.9950 3 5.0 5.0 6 1.5 3 ppm/C 5.0030 5.0050 V % SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX6173-MAX6177
Load Regulation (Note 3)
Output Short-Circuit Current Temperature Hysteresis (Note 4) Long-Term Stability DYNAMIC Noise Voltage Turn-On Settling Time INPUT Supply Voltage Range Quiescent Supply Current TEMP OUTPUT TEMP Output Voltage TEMP Temperature Coefficient
ISC VOUT/ cycle VOUT/ time
eOUT tR VIN IIN
f = 0.1Hz to 10Hz f = 10Hz to 1kHz To VOUT = 0.1% of final value, COUT = 50pF Guaranteed by line regulation test No load TA = +25C TA = -40C to +125C 7.0
9 14.5 230 40.0 320 550 700 630 2.1
VP-P VRMS s V A
VTEMP TCTEMP
mV mV/C
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High-Precision Voltage References with Temperature Sensor MAX6173-MAX6177
ELECTRICAL CHARACTERISTICS--MAX6176 (VOUT = 10V)
(VIN = +15V, TA = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER OUTPUT Output Voltage Output Adjustment Range Output-Voltage Temperature Coefficient (Note 2) Line Regulation (Note 3) VOUT VTRIM TCVOUT VOUT/ VIN VOUT/ IOUT No load, TA = +25C RPOT = 10k MAX6176AASA TA = -40C to +125C MAX6176BASA 12V VIN 40V Sourcing: 0 IOUT 10mA Sinking: -0.6mA IOUT 0 OUT shorted to GND OUT shorted to IN TA = +25C TA = -40C to +125C TA = +25C TA = -40C to +125C TA = +25C TA = -40C to +125C 3 0.6 0.8 2 2 50 90 60 3 120 1000 hours at TA = +25C 50 10 5 10 10 15 500 900 mA ppm ppm ppm/mA ppm/V MAX6176A (0.05%) MAX6176B (0.1%) 9.9950 9.9900 3 10.0 10.0 6 1.5 3 ppm/C 10.0050 10.0100 V % SYMBOL CONDITIONS MIN TYP MAX UNITS
Load Regulation (Note 3)
Output Short-Circuit Current Temperature Hysteresis (Note 4) Long-Term Stability DYNAMIC Noise Voltage Turn-On Settling Time INPUT Supply Voltage Range Quiescent Supply Current TEMP OUTPUT TEMP Output Voltage TEMP Temperature Coefficient
ISC VOUT/ cycle VOUT/ time
eOUT tR VIN IIN
f = 0.1Hz to 10Hz f = 10Hz to 1kHz To VOUT = 0.1% of final value, COUT = 50pF Guaranteed by line regulation test No load TA = +25C TA = -40C to +125C 12.0
18 29 400 40.0 340 550 700 630 2.1
VP-P VRMS s V A
VTEMP TCTEMP
mV mV/C
Note 1: Note 2: Note 3: Note 4:
All devices are 100% production tested at TA = +25C and guaranteed by design over TA = TMIN to TMAX, as specified. Temperature coefficient is defined as VOUT divided by the temperature range. Line and load regulation specifications do not include the effects of self-heating. Thermal hysteresis is defined as the change in +25C output voltage before and after cycling the device from TMAX to TMIN.
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High-Precision Voltage References with Temperature Sensor
Typical Operating Characteristics
(VIN = +5V for VOUT = +2.5V, VIN = +15V for VOUT = +10V, IOUT = 0, TA = +25C, unless otherwise noted.)
OUTPUT VOLTAGE vs. TEMPERATURE (VOUT = 2.5V)
MAX6173 toc01
MAX6173-MAX6177
OUTPUT VOLTAGE vs. TEMPERATURE (VOUT = 10V)
MAX6173 toc02
LOAD REGULATION vs. SOURCE CURRENT (VOUT = 2.5V)
MAX6173 toc03
2.502
10.003 10.002 10.001 OUTPUT VOLTAGE (V) 10.000 9.999 9.998 9.997 9.996 9.995
0.50 OUTPUT VOLTAGE CHANGE (mV)
2.501 OUTPUT VOLTAGE (V)
0.25 TA = +25C 0
TA = -40C
2.500
2.499 THREE TYPICAL PARTS 2.498 -50 -25 0 25 50 75 100 125 TEMPERATURE (C)
-0.25 TA = +125C -0.50 0 5 10 15 20 25 30 SOURCE CURRENT (mA)
9.994 9.993 -50
THREE TYPICAL PARTS -25 0 25 50 75 100 125
TEMPERATURE (C)
LOAD REGULATION vs. SOURCE CURRENT (VOUT = 10V)
MAX6173 toc04
LOAD REGULATION vs. SINK CURRENT (VOUT = 2.5V)
MAX6173 toc05
LOAD REGULATION vs. SINK CURRENT (VOUT = 10V)
MAX6173 toc06
0.50 OUTPUT VOLTAGE CHANGE (mV) TA = +25C 0.25 TA = +125C 0
1.00 OUTPUT VOLTAGE CHANGE (mV) 0.75 0.50 TA = +125C 0.25 0 TA = -40C -0.25 -0.50 TA = +25C
2.0 OUTPUT VOLTAGE CHANGE (mV) 1.5 TA = -40C 1.0 0.5 0 -0.5 -1.0 0 0.5 1.0 SINK CURRENT (mA) 1.5 TA = +25C TA = +125C
-0.25 TA = -40C -0.50 0 5 10 15 20 25 30 SOURCE CURRENT (mA)
0
0.5
1.0 SINK CURRENT (mA)
1.5
2.0
2.0
LINE REGULATION vs. TEMPERATURE (VOUT = 2.5V)
MAX6173 toc07
LINE REGULATION vs. TEMPERATURE (VOUT = 10V)
MAX6173 toc08
MINIMUM INPUT-OUTPUT DIFFERENTIAL vs. SOURCE CURRENT (VOUT = 2.5V)
MAX6173 toc09
100
300 250 TA = +125C 200 150 100 50 0 TA = -40C
2.5
OUTPUT VOLTAGE CHANGE (V)
80 TA = -40C 60 TA = +125C 40
OUTPUT VOLTAGE CHANGE (V)
DROPOUT VOLTAGE (V)
2.0 TA = +125C 1.5 TA = +25C 1.0 TA = -40C
20 TA = +25C 0 0 5 10 15 20 25 30 35 40 INPUT VOLTAGE (V)
TA = +25C 0.5 12 16 20 24 28 32 36 40 0 4 8 12 16 20 INPUT VOLTAGE (V) SOURCE CURRENT (mA)
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High-Precision Voltage References with Temperature Sensor MAX6173-MAX6177
Typical Operating Characteristics (continued)
(VIN = +5V for VOUT = +2.5V, VIN = +15V for VOUT = +10V, IOUT = 0, TA = +25C, unless otherwise noted.)
MINIMUM INPUT-OUTPUT DIFFERENTIAL vs. SOURCE CURRENT (VOUT = 10V)
MAX6173 toc10
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (VOUT = 2.5V)
MAX6173 toc11
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (VOUT = 10V)
-20 -40 PSRR (dB) -60 -80
MAX6173 toc12
2.5
0 -20 -40 PSRR (dB) -60 -80 -100 -120
0
DROPOUT VOLTAGE (V)
2.0 TA = +125C
1.5
TA = +25C
1.0
TA = -40C
-100 -120 0.001
0.5 0 4 8 12 16 20 SOURCE CURRENT (mA)
-140 0.001
0.01
0.1
1
10
100
1000
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
FREQUENCY (kHz)
OUTPUT IMPEDANCE vs. FREQUENCY (VOUT = 2.5V)
MAX6173 toc13
SUPPLY CURRENT vs. INPUT VOLTAGE (VOUT = 2.5V)
MAX6173 toc14
SUPPLY CURRENT vs. INPUT VOLTAGE (VOUT = 10V)
350 SUPPLY CURRENT (A) 300 250 200 150 100 50 0 TA = -40C TA = +25C TA = +125C
MAX6173 toc15
100
400 350 SUPPLY CURRENT (A) 300 250 200 150 100 50 TA = -40C TA = +25C TA = +125C
400
OUTPUT IMPEDANCE ()
10
1
0.1
0.01
0.001 0.01 0.1 1 10 100 1000 FREQUENCY (kHz)
0 0 5 10 15 20 25 30 35 40 INPUT VOLTAGE (V)
0
5
10
15
20
25
30
35
40
INPUT VOLTAGE (V)
SUPPLY CURRENT vs. TEMPERATURE (VOUT = 2.5V)
MAX6173 toc16
SUPPLY CURRENT vs. TEMPERATURE (VOUT = 10V)
MAX6173 toc17
TEMP VOLTAGE vs. TEMPERATURE (VOUT = 2.5V)
MAX6173 toc18
350
375
800
350 SUPPLY CURRENT (A)
SUPPLY CURRENT (A)
325
TEMP VOLTAGE (mV) -50 -25 0 25 50 75 100 125
325
700
300
600
300
275
275
500
250 -50 -25 0 25 50 75 100 125 TEMPERATURE (C)
250 TEMPERATURE (C)
400 -50 -25 0 25 50 75 100 125 TEMPERATURE (C)
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High-Precision Voltage References with Temperature Sensor
Typical Operating Characteristics (continued)
(VIN = +5V for VOUT = +2.5V, VIN = +15V for VOUT = +10V, IOUT = 0, TA = +25C, unless otherwise noted.)
TEMP VOLTAGE vs. TEMPERATURE (VOUT = 10V)
MAX6173 toc19
MAX6173-MAX6177
OUTPUT VOLTAGE vs. TRIM VOLTAGE (VOUT = 2.5V)
MAX6173 toc20
LONG-TERM STABILITY vs. TIME (VOUT = 2.500V)
TWO TYPICAL PARTS 2.501
MAX6173 toc21
900
2.65 2.60 OUTPUT VOLTAGE (V) 2.55 2.50 2.45
2.502
800 TEMP VOLTAGE (mV)
VOUT (V) 0 0.5 1.0 1.5 2.0 2.5
700
2.500
600
500
2.499 2.40 2.35 -50 -25 0 25 50 75 100 125 TEMPERATURE (C) TRIM VOLTAGE (V) 2.498 0 200 400 600 800 1000 TIME (hours)
400
LONG-TERM STABILITY vs. TIME (VOUT = 10.0V)
MAX6173 toc22
OUTPUT-VOLTAGE NOISE DENSITY vs. FREQUENCY (VOUT = 2.5V)
MAX6173 toc23
OUTPUT-VOLTAGE NOISE DENSITY vs. FREQUENCY (VOUT = 10V)
OUTPUT VOLTAGE-NOISE DENSITY (nV/Hz)
MAX6173 toc24
TWO TYPICAL PARTS 10.001 VOUT (V)
OUTPUT VOLTAGE-NOISE DENSITY (nV/Hz)
10.002
1000
10,000
10.000
1000
9.999
9.998 0 200 400 600 800 1000 TIME (hours)
100 0.1 1 10 100 FREQUENCY (Hz) 1000
100 0.1 1 10 100 FREQUENCY (Hz) 1000
0.1Hz TO 10Hz OUTPUT NOISE (VOUT = 2.5V)
MAX6173 toc25
0.1Hz TO 10Hz OUTPUT NOISE (VOUT = 10V)
MAX6173 toc26
1V/div
4V/div
1s/div
1s/div
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High-Precision Voltage References with Temperature Sensor MAX6173-MAX6177
Typical Operating Characteristics (continued)
(VIN = +5V for VOUT = +2.5V, VIN = +15V for VOUT = +10V, IOUT = 0, TA = +25C, unless otherwise noted.)
LOAD TRANSIENT (VOUT = 2.5V, COUT = 0, 0 TO 20mA)
MAX6173 toc27
LOAD TRANSIENT (VOUT = 10V, COUT = 0, 0 TO 20mA)
MAX6173 toc28
20mA IOUT
20mA IOUT 0
0 VOUT AC-COUPLED 1V/div
VOUT AC-COUPLED 1V/div
10s/div
10s/div
LOAD TRANSIENT (VOUT = 2.5V, COUT = 1F, 0 TO +20mA)
MAX6173 toc29
LOAD TRANSIENT (VOUT = 10V, COUT = 1F, 0 TO 20mA)
MAX6173 toc30
20mA 20mA IOUT 0 IOUT 0
VOUT AC-COUPLED 50mV/div
VOUT AC-COUPLED 100mV/div
200s/div
100s/div
LOAD TRANSIENT (VOUT = 2.5V, COUT = 0, 0 TO -2mA)
MAX6173 toc31
LOAD TRANSIENT (VOUT = 10V, COUT = 0, 0 TO -2mA)
MAX6173 toc32
0 0 IOUT -2mA IOUT -2mA
VOUT AC-COUPLED 200mV/div
VOUT AC-COUPLED 20mV/div
40s/div
200s/div
10
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High-Precision Voltage References with Temperature Sensor
Typical Operating Characteristics (continued)
(VIN = +5V for VOUT = +2.5V, VIN = +15V for VOUT = +10V, IOUT = 0, TA = +25C, unless otherwise noted.)
LOAD TRANSIENT (VOUT = 2.5V, COUT = 1F, 0 TO -2mA)
MAX6173 toc33
MAX6173-MAX6177
LOAD TRANSIENT (VOUT = 10V, COUT = 1F, 0 TO -2mA)
MAX6173 toc34
0 0 IOUT -2mA IOUT -2mA
VOUT AC-COUPLED 20mV/div
VOUT AC-COUPLED 5mV/div
400s/div
400s/div
LINE TRANSIENT (VOUT = 2.5V)
MAX6173 toc35
LINE TRANSIENT (VOUT = 10V)
5.5V VIN 4.5V
MAX6173 toc36
15.5V VIN 1V/div 14.5V
VOUT AC-COUPLED 200mV/div COUT = 0 10s/div 2s/div
VOUT AC-COUPLED 200mV/div
TURN-ON TRANSIENT (VOUT = 2.5V, COUT = 0)
MAX6173 toc37
TURN-ON TRANSIENT (VOUT = 2.5V, COUT = 1F)
MAX6173 toc38
VIN 2V/div GND VIN 2V/div GND VOUT 1V/div GND COUT = 0 10s/div 40s/div VOUT 1V/div GND
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High-Precision Voltage References with Temperature Sensor MAX6173-MAX6177
Typical Operating Characteristics (continued)
(VIN = +5V for VOUT = +2.5V, VIN = +15V for VOUT = +10V, IOUT = 0, TA = +25C, unless otherwise noted.)
TURN-ON TRANSIENT (VOUT = 10V, COUT = 0)
MAX6173 toc39
TURN-ON TRANSIENT (VOUT = 10V, COUT = 1F)
MAX6173 toc40
VIN 5V/div GND
VIN 5V/div
GND
VOUT 5V/div GND 100s/div 200s/div
VOUT 5V/div GND
Pin Description
PIN 1, 8 2 3 4 5 6 7 NAME I.C. IN TEMP GND TRIM OUT N.C. FUNCTION Internally Connected. Do not connect externally. Positive Power-Supply Input Temperature Proportional Output Voltage. TEMP generates an output voltage proportional to the die temperature. Ground 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. Output Voltage No Connection. Not internally connected.
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 voltages. These devices feature a proprietary temperaturecoefficient curvature-correction circuit and laser-trimmed thin-film resistors that result in a very low 3ppm/C temperature coefficient and excellent 0.05% initial accuracy. The MAX6173-MAX6177 draw 340A of supply current and source 30mA or sink 2mA of load current.
Use the following formula to calculate the change in output voltage from its preset value: VOUT = 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 50k potentiometer (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 1M or less. Currents through resistors R1 and R2 add to the quiescent supply current.
Trimming the Output Voltage
Trim the factory-preset output voltage on the MAX6173-MAX6177 by placing a resistive divider network between OUT, TRIM, and GND.
12
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High-Precision Voltage References with Temperature Sensor
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, n= VTEMP (at TJ = T0 ) 1.9mV / K T0 supply can experience step changes, a larger output capacitor reduces the amount of overshoot (undershoot) and improves the circuit's transient response. Place output capacitors as close to the devices as possible for best performance.
MAX6173-MAX6177
Supply Current
The MAX6173-MAX6177 consume 320A (typ) of quiescent 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 = +25C 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 thermal hysteresis value is 120ppm.
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 0.1F 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 100F. In applications where the load or the
Turn-On Time
The MAX6173-MAX6177 typically turn on and settle to within 0.1% of the preset output voltage in 150s (2.5V output). The turn-on time can increase up to 150s with the device operating with a 1F 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.
10,000 1000 100 TEMPERATURE COEFFICIENT (ppm/C) 8-BIT 10 1 0.1 0.01 1 10 OPERATING TEMPERATURE RANGE (TMAX - TMIN) (C) 10-BIT 12-BIT 14-BIT 16-BIT 18-BIT 20-BIT 100
Figure 1. Temperature Coefficient vs. Operating Temperature Range for a 1 LSB Maximum Error
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13
High-Precision Voltage References with Temperature Sensor MAX6173-MAX6177
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 resolution limit through the operating temperature range. Figure 1 shows the maximum allowable reference-voltage 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 reference-voltage temperature coefficient as the only parameter affecting accuracy. In reality, the absolute static accuracy of a data converter is dependent on the combination of many parameters such as integral nonlinearity, differential nonlinearity, offset error, gain error, as well as voltagereference changes.
( VOUT + 2V) TO 40V INPUT
IN REFERENCE OUTPUT
OUT
*
MAX6173-MAX6177 MAX5436 50k POTENTIOMETER
TEMP
TRIM
GND
*OPTIONAL.
Figure 2. Applications Circuit Using the MAX5436 Potrntiometer
Pin Configuration
TOP VIEW
I.C.* IN TEMP 1 2 3 8 7 I.C.* N.C. OUT TRIM
Chip Information
TRANSISTOR COUNT: 429 PROCESS: BiCMOS
MAX6173- MAX6177
6 5
GND 4
SO
*INTERNALLY CONNECTED. DO NOT CONNECT.
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High-Precision Voltage References with Temperature Sensor
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
SOICN .EPS
MAX6173-MAX6177
INCHES DIM A A1 B C e E H L MAX MIN 0.069 0.053 0.010 0.004 0.014 0.019 0.007 0.010 0.050 BSC 0.150 0.157 0.228 0.244 0.016 0.050
MILLIMETERS MAX MIN 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 1.27 BSC 3.80 4.00 5.80 6.20 0.40 1.27
N
E
H
VARIATIONS:
1
INCHES
MILLIMETERS MIN 4.80 8.55 9.80 MAX 5.00 8.75 10.00 N MS012 8 AA 14 AB 16 AC
TOP VIEW
DIM D D D
MIN 0.189 0.337 0.386
MAX 0.197 0.344 0.394
D A e B A1 L C
0-8
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, .150" SOIC
APPROVAL DOCUMENT CONTROL NO. REV.
21-0041
B
1 1
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 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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