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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 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. 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 _______________________________________________________________________________________ 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 _______________________________________________________________________________________ 3 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 4 _______________________________________________________________________________________ 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 _______________________________________________________________________________________ 5 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. 6 _______________________________________________________________________________________ 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) _______________________________________________________________________________________ 7 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) 8 _______________________________________________________________________________________ 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 _______________________________________________________________________________________ 9 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 ______________________________________________________________________________________ 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 ______________________________________________________________________________________ 11 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 ______________________________________________________________________________________ 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 ______________________________________________________________________________________ 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. 14 ______________________________________________________________________________________ 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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