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19-1408; Rev 2; 10/01
Precision, Micropower, Low-Dropout Voltage References
General Description
The MAX6190-MAX6195/MAX6198 precision, micropower, low-dropout voltage references offer high initial accuracy and very low temperature coefficient through a proprietary curvature-correction circuit and lasertrimmed precision thin-film resistors. These series-mode bandgap references draw a maximum of only 35A quiescent supply current, making them ideal for battery-powered instruments. They offer a supply current that is virtually immune to input voltage variations. Load-regulation specifications are guaranteed for source and sink currents up to 500A. These devices are internally compensated, making them ideal for applications that require fast settling, and are stable with capacitive loads up to 2.2nF. o 2mV (max) Initial Accuracy o 5ppm/C (max) Temperature Coefficient o 35A (max) Supply Current o 100mV Dropout at 500A Load Current o 0.12V/A Load Regulation o 8V/V Line Regulation
Features
MAX6190-MAX6195/MAX6198
Applications
Hand-Held Instruments Analog-to-Digital and Digital-to-Analog Converters Industrial Process Control Precision 3V/5V Systems Hard-Disk Drives
Selector Guide
PART MAX6190A MAX6190B MAX6190C MAX6191A MAX6191B MAX6191C MAX6192A MAX6192B MAX6192C MAX6193A MAX6193B MAX6193C MAX6198A MAX6198B MAX6198C MAX6194A MAX6194B MAX6194C MAX6195A MAX6195B MAX6195C OUTPUT VOLTAGE (V) 1.250 1.250 1.250 2.048 2.048 2.048 2.500 2.500 2.500 3.000 3.000 3.000 4.096 4.096 4.096 4.500 4.500 4.500 5.000 5.000 5.000 INITIAL ACCURACY (mV) 2 4 6 2 5 10 2 5 10 2 5 10 2 5 10 2 5 10 2 5 10 TEMPERATURE COEFFICIENT (ppm/C) <5 <10 <25 <5 <10 <25 <5 <10 <25 <5 <10 <25 <5 <10 <25 <5 <10 <25 <5 <10 <25
Ordering Information
PART MAX6190AESA MAX6190BESA MAX6190CESA MAX6191AESA MAX6191BESA MAX6191CESA MAX6192AESA MAX6192BESA MAX6192CESA TEMP RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 8 SO 8 SO 8 SO 8 SO 8 SO 8 SO 8 SO 8 SO 8 SO
Ordering Information continued at end of data sheet.
Pin Configuration
TOP VIEW
N.C. IN N.C. 1 2 3 8 N.C. N.C. OUT N.C.
MAX6190- MAX6195 MAX6198
7 6 5
GND 4
Typical Operating Circuit appears at end of data sheet. SO
________________________________________________________________ Maxim Integrated Products
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Precision, Micropower, Low-Dropout Voltage References MAX6190-MAX6195/MAX6198
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to GND IN ......................................................................-0.3V to +13.5V OUT ..........................................................-0.3V to (VIN + 0.3V) Output Short Circuit to GND or IN (VIN < 6V) ............Continuous Output Short Circuit to GND or IN (VIN 6V) .........................60s Continuous Power Dissipation (TA = +70C) 8-Pin SO (derate 5.88mW/C above +70C)................471mW Operating Temperature Range ...........................-40C to +85C 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--MAX6190
(VIN = 5V, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER OUTPUT MAX6190A Output Voltage VOUT TA = +25C MAX6190A Output-Voltage Temperature Coefficient (Note 1) Line Regulation Load Regulation Short-Circuit Current Temperature Hysteresis (Note 2) Long-Term Stability DYNAMIC Noise Voltage Ripple Rejection Turn-On Settling Time Capacitive-Load Stability Range INPUT Supply Voltage Range Quiescent Supply Current Change in Supply Current VIN IIN IIN/VIN 2.5V VIN 12.6V Guaranteed by line-regulation test 2.5 27 0.8 12.6 35 2 V A A/V eOUT VOUT/VIN tR COUT 0.1Hz to 10Hz 10Hz to 10kHz VIN = 5V 100mV, f = 120Hz To 0.1%, COUT = 50pF (Note 3) 0 25 65 86 30 2.2 VP-P VRMS dB s nF TCVOUT VOUT/ VIN VOUT/ IOUT ISC VOUT/ cycle VOUT/ time 1000hrs at +25C MAX6190B MAX6190C 2.5V VIN 12.6V Sourcing: 0 IOUT 500A Sinking: -500A IOUT 0 Short to GND Short to IN MAX6190B MAX6190C 1.248 1.246 1.244 1.250 1.250 1.250 2 4 8 8 0.12 0.15 4 4 75 50 1.252 1.254 1.256 5 10 25 80 0.5 0.6 V/V V/A mA ppm ppm/ 1000hrs ppm/C V SYMBOL CONDITIONS MIN TYP MAX UNITS
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Precision, Micropower, Low-Dropout Voltage References
ELECTRICAL CHARACTERISTICS--MAX6191
(VIN = 5V, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER OUTPUT MAX6191A Output Voltage VOUT TA = +25C MAX6191A Output-Voltage Temperature Coefficient (Note 1) Line Regulation Load Regulation Short-Circuit Current Temperature Hysteresis (Note 2) Long-Term Stability DYNAMIC Noise Voltage Ripple Rejection Turn-On Settling Time Capacitive-Load Stability Range INPUT Supply Voltage Range Quiescent Supply Current Change in Supply Current VIN IIN IIN/VIN 2.5V VIN 12.6V Guaranteed by line-regulation test 2.5 27 0.8 12.6 35 2 V A A/V eOUT VOUT/VIN tR COUT 0.1Hz to 10Hz 10Hz to 10kHz VIN = 5V 100mV, f = 120Hz To 0.1%, COUT = 50pF (Note 3) 0 40 105 84 30 2.2 VP-P VRMS dB s nF TCVOUT VOUT/ VIN VOUT/ IOUT ISC VOUT/ cycle VOUT/ time 1000hrs at +25C MAX6191B MAX6191C 2.5V VIN 12.6V Sourcing: 0 IOUT 500A Sinking: -500A IOUT 0 Short to GND Short to IN MAX6191B MAX6191C 2.046 2.043 2.038 2.048 2.048 2.048 2 4 8 10 0.12 0.18 4 4 75 50 2.050 2.053 2.058 5 10 25 100 0.55 0.70 V/V V/A mA ppm ppm/ 1000hrs ppm/C V SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX6190-MAX6195/MAX6198
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Precision, Micropower, Low-Dropout Voltage References MAX6190-MAX6195/MAX6198
ELECTRICAL CHARACTERISTICS--MAX6192
(VIN = 5V, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER OUTPUT MAX6192A Output Voltage VOUT TA = +25C MAX6192A Output-Voltage Temperature Coefficient (Note 1) Line Regulation Load Regulation Dropout Voltage (Note 4) Short-Circuit Current Temperature Hysteresis (Note 2) Long-Term Stability DYNAMIC Noise Voltage Ripple Rejection Turn-On Settling Time Capacitive-Load Stability Range INPUT Supply Voltage Range Quiescent Supply Current Change in Supply Current VIN IIN IIN/VIN (VOUT + 0.2V) VIN 12.6V Guaranteed by line-regulation test VOUT + 0.2 27 0.8 12.6 35 2 V A A/V eOUT VOUT/VIN tR COUT 0.1Hz to 10Hz 10Hz to 10kHz VIN = 5V 100mV, f = 120Hz To 0.1%, COUT = 50pF (Note 3) 0 60 125 82 85 2.2 VP-P VRMS dB s nF TCVOUT VOUT/ VIN VOUT/ IOUT MAX6192B MAX6192C (VOUT + 0.2V) VIN 12.6V Sourcing: 0 IOUT 500A Sinking: -500A IOUT 0 Short to GND Short to IN MAX6192B MAX6192C 2.498 2.495 2.490 2.500 2.500 2.500 2 4 8 15 0.14 0.18 100 4 4 75 1000hrs at +25C 50 2.502 2.505 2.510 5 10 25 140 0.60 0.80 200 V/V V/A mV mA ppm ppm/ 1000hrs ppm/C V SYMBOL CONDITIONS MIN TYP MAX UNITS
VIN - VOUT VOUT 0.2%, IOUT = 500A ISC VOUT/ cycle VOUT/ time
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Precision, Micropower, Low-Dropout Voltage References
ELECTRICAL CHARACTERISTICS--MAX6193
(VIN = 5V, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER OUTPUT MAX6193A Output Voltage VOUT TA = +25C MAX6193A Output-Voltage Temperature Coefficient (Note 1) Line Regulation Load Regulation Dropout Voltage (Note 4) Short-Circuit Current Temperature Hysteresis (Note 2) Long-Term Stability DYNAMIC Noise Voltage Ripple Rejection Turn-On Settling Time Capacitive-Load Stability Range INPUT Supply Voltage Range Quiescent Supply Current Change in Supply Current VIN IIN IIN/VIN (VOUT + 0.2V) VIN 12.6V Guaranteed by line-regulation test VOUT + 0.2 27 0.8 12.6 35 2 V A A/V eOUT VOUT/VIN tR COUT 0.1Hz to 10Hz 10Hz to 10kHz VIN = 5V 100mV, f = 120Hz To 0.1%, COUT = 50pF (Note 3) 0 75 150 80 100 2.2 VP-P VRMS dB s nF TCVOUT VOUT/ VIN VOUT/ VIN MAX6193B MAX6193C 2.5V VIN 12.6V 2.5V VIN 12.6V MAX6193B MAX6193C 2.998 2.995 2.990 3.000 3.000 3.000 2 4 8 20 0.14 0.18 100 4 4 75 1000hrs at +25C 50 3.002 3.005 3.010 5 10 25 150 0.60 0.80 200 V/V V/V mV mA ppm ppm/ 1000hrs ppm/C V SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX6190-MAX6195/MAX6198
VIN - VOUT IOUT = 500A ISC VOUT/ cycle VOUT/ time Short to GND Short to IN
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Precision, Micropower, Low-Dropout Voltage References MAX6190-MAX6195/MAX6198
ELECTRICAL CHARACTERISTICS--MAX6194
(VIN = 5V, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER INPUT MAX6194A Output Voltage VOUT TA = +25C MAX6194A Output-Voltage Temperature Coefficient (Note 1) Line Regulation Load Regulation Dropout Voltage (Note 4) Short-Circuit Current Temperature Hysteresis (Note 2) Long-Term Stability DYNAMIC Noise Voltage Ripple Rejection Turn-On Settling Time Capacitive-Load Stability Range OUTPUT Supply Voltage Range Quiescent Supply Current Change in Supply Current VIN IIN IIN/VIN (VOUT + 0.2V) VIN 12.6V Guaranteed by line-regulation test VOUT + 0.2 27 0.8 12.6 35 2 V A A/V eOUT VOUT/VIN tR COUT 0.1Hz to 10Hz 10Hz to 10kHz VIN = 5V 100mV, f = 120Hz To 0.1%, COUT = 50pF (Note 3) 0 110 215 76 180 2.2 VP-P VRMS dB s nF TCVOUT VOUT/ VIN VOUT/ IOUT MAX6194B MAX6194C (VOUT + 0.2V) VIN 12.6V Sourcing: 0 IOUT 500A Sinking: -500A IOUT 0 Short to GND Short to IN MAX6194B MAX6194C 4.498 4.495 4.490 4.500 4.500 4.500 2 4 8 25 0.16 0.22 100 4 4 75 1000hrs at +25C 50 4.502 4.505 4.510 5 10 25 160 0.80 1.00 200 V/V V/A mV mA ppm ppm/ 1000hrs ppm/C V SYMBOL CONDITIONS MIN TYP MAX UNITS
VIN - VOUT VOUT 0.2%, IOUT = 500A ISC VOUT/ cycle VOUT/ time
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Precision, Micropower, Low-Dropout Voltage References
ELECTRICAL CHARACTERISTICS--MAX6195
(VIN = 5.5V, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER OUTPUT INPUT MAX6195A Output Voltage VOUT TA = +25C MAX6195A Output-Voltage Temperature Coefficient (Note 1) Line Regulation Load Regulation Dropout Voltage (Note 4) Short-Circuit Current Temperature Hysteresis (Note 2) Long-Term Stability DYNAMIC Noise Voltage Ripple Rejection Turn-On Settling Time Capacitive-Load Stability Range OUTPUT INPUT Supply Voltage Range Quiescent Supply Current Change in Supply Current VIN IIN IIN/VIN (VOUT + 0.2V) VIN 12.6V Guaranteed by line-regulation test VOUT + 0.2 27 0.8 12.6 35 2 V A A/V eOUT VOUT/VIN tR COUT 0.1Hz to 10Hz 10Hz to 10kHz VIN = 5.5V 100mV, f = 120Hz To 0.1%, COUT = 50pF (Note 3) 0 120 240 72 220 2.2 VP-P VRMS dB s nF TCVOUT VOUT/ VIN VOUT/ IOUT MAX6195B MAX6195C (VOUT + 0.2V) VIN 12.6V Sourcing: 0 IOUT 500A Sinking: -500A IOUT 0 Short to GND Short to IN MAX6195B MAX6195C 4.998 4.995 4.990 5.000 5.000 5.000 2 4 8 25 0.17 0.24 100 4 4 75 1000hrs at +25C 50 5.002 5.005 5.010 5 10 25 160 0.85 1.10 200 V/V V/A mA mA ppm ppm/ 1000hrs ppm/C V SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX6190-MAX6195/MAX6198
VIN - VOUT VOUT 0.2%, IOUT = 500A ISC VOUT/ cycle VOUT/ time
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Precision, Micropower, Low-Dropout Voltage References MAX6190-MAX6195/MAX6198
ELECTRICAL CHARACTERISTICS--MAX6198
(VIN = 5V, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER OUTPUT MAX6198A Output Voltage VOUT TA = +25C MAX6198A Output-Voltage Temperature Coefficient (Note 1) Line Regulation Load Regulation Dropout Voltage (Note 4) Short-Circuit Current Temperature Hysteresis (Note 2) Long-Term Stability DYNAMIC DYNAMIC Noise Voltage Ripple Rejection Turn-On Settling Time Capacitive-Load Stability Range INPUT INPUT Supply Voltage Range Quiescent Supply Current Change in Supply Current Note 1: Note 2: Note 3: Note 4: VIN IIN IIN/VIN (VOUT + 0.2V) VIN 12.6V Guaranteed by line-regulation test VOUT + 0.2 27 0.8 12.6 35 2 V A A/V eOUT VOUT/VIN tR COUT 0.1Hz to 10Hz 10Hz to 10kHz VIN = 5V 100mV, f = 120Hz To 0.1%, COUT = 50pF (Note 3) 0 100 200 77 160 2.2 VP-P VRMS dB s nF TCVOUT VOUT/ VIN VOUT/ IOUT MAX6198B MAX6198C (VOUT + 0.2V) VIN 12.6V Sourcing: 0 IOUT 500A Sinking: -500A IOUT 0 Short to GND Short to IN MAX6198B MAX6198C 4.094 4.091 4.086 4.096 4.096 4.096 2 4 8 25 0.15 0.20 100 4 4 75 1000hrs at +25C 50 4.098 4.101 4.106 5 10 25 160 0.70 0.90 200 V/V V/A mV mA ppm ppm/ 1000hrs ppm/C V SYMBOL CONDITIONS MIN TYP MAX UNITS
VIN - VOUT VOUT 0.2%, IOUT = 500A ISC VOUT/ cycle VOUT/ time
Temperature Coefficient is measured by the "box" method; i.e., the maximum VOUT is divided by the maximum t. Thermal Hysteresis is defined as the change in +25C output voltage before and after cycling the device from TMIN to TMAX. Not production tested. Guaranteed by design. Dropout voltage is the minimum input voltage at which VOUT changes 0.2% from VOUT at VIN = 5.0V (VIN = 5.5V for MAX6195).
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Precision, Micropower, Low-Dropout Voltage References
Typical Operating Characteristics
(VIN = 5V for MAX6190/1/2/3/4/8, VIN = 5.5V for MAX6195; IOUT = 0; TA = +25C; unless otherwise noted.) (Note 5)
MAX6190 OUTPUT VOLTAGE TEMPERATURE DRIFT
MAX6190 toc01
MAX6190-MAX6195/MAX6198
MAX6195 OUTPUT VOLTAGE TEMPERATURE DRIFT
MAX6190 toc02
MAX6195 LONG-TERM DRIFT
5.002 5.001 OUTPUT VOLTAGE (V) 5.000 4.999 4.998 4.997 4.996 4.995 4.994 4.993 THREE TYPICAL PARTS
MAX6190 toc03
1.2508 1.2506 1.2504 VOUT (V)
5.0040 5.0035 5.0030 5.0025 VOUT (V) THREE TYPICAL PARTS
5.003
1.2502 1.2500 1.2498 1.2496 1.2494 -40 THREE TYPICAL PARTS -20 0 20 40 60 80 100
5.0020 5.0015 5.0010 5.0005 5.0000 4.9995 -40 -20 0 20 40 60 80 100
0 100 200 300 400 500 600 700 800 900 1000 TIME (HOURS)
TEMPERATURE DRIFT (C)
TEMPERATURE DRIFT (C)
MAX6190 LINE REGULATION
MAX6190 toc04
MAX6195 LINE REGULATION
MAX6190 toc05
MAX6192/MAX6193 DROPOUT VOLTAGE vs. SOURCE CURRENT
0.7 DROPOUT VOLTAGE (V) 0.6 0.5 TA = -40C 0.4 0.3 0.2 0.1 TA = +25C 0 200 400 600 800 1000 TA = +85C
MAX6190 toc06
400 OUTPUT VOLTAGE CHANGE (V)
800 OUTPUT VOLTAGE CHANGE (V) TA = +85C 600 TA = -40C 400
0.8
300 TA = +85C 200 TA = -40C
100
200
TA = +25C
0
TA = +25C
0
-100 2 4 6 8 10 12 14 INPUT VOLTAGE (V)
-200 5 7 9 INPUT VOLTAGE (V) 11 13
0 SOURCE CURRENT (A)
MAX6190 LOAD REGULATION
MAX6190 toc07
MAX6195 LOAD REGULATION
MAX6012 toc08
MAX6194/MAX6195/MAX6198 DROPOUT VOLTAGE vs. SOURCE CURRENT
TA = -40C 0.25 DROPOUT VOLTAGE (V) TA = +85C 0.20 0.15 0.10 0.05 TA = +25C
MAX6190 toc09
0.4 OUTPUT VOLTAGE CHANGE (mV)
0.4 OUTPUT VOLTAGE CHANGE (mV)
0.30
0.2 TA = -40C 0 TA = +85C -0.2 TA = +25C
0.2 TA = -40C 0
-0.2
TA = +25C TA = +85C
-0.4 -500 -375 -250 -125
0
125 250 375 500
-0.4 -500 -375 -250 -125
0 0 125 250 375 500 0 200 400 600 800 1000 SOURCE CURRENT (A)
LOAD CURRENT (A)
LOAD CURRENT (A)
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Precision, Micropower, Low-Dropout Voltage References MAX6190-MAX6195/MAX6198
Typical Operating Characteristics (continued)
(VIN = 5V for MAX6190/1/2/3/4/8, VIN = 5.5V for MAX6195; IOUT = 0; TA = +25C; unless otherwise noted.) (Note 5)
MAX6190 POWER-SUPPLY REJECTION vs. FREQUENCY
MAX6190 toc10
MAX6195 POWER-SUPPLY REJECTION vs. FREQUENCY
VCC = 5.5V 0.25V
MAX16190 toc11
SUPPLY CURRENT vs. INPUT VOLTAGE
38 36 SUPPLY CURRENT (A) 34 32 30 28 26 24 22 VALID OVER SPECIFIED VIN (MIN) TO VIN (MAX) FOR EACH PART
MAX6190 toc12
100
100
40
10 PSR (mV/V) PSR (mV/V)
10
1
1
0.1 0.01 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
0.1 0.01 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
20 2 4 6 8 10 12 14 INPUT VOLTAGE (V)
MAX6190 OUTPUT IMPEDANCE vs. FREQUENCY
MAX6190 toc13
MAX6195 OUTPUT IMPEDANCE vs. FREQUENCY
MAX6190 toc14
SUPPLY CURRENT vs. TEMPERATURE
MAX6190 toc15
1k
1k
40
OUTPUT IMPEDANCE ()
OUTPUT IMPEDANCE ()
SUPPLY CURRENT (A)
100
100
35 VIN = 12.5V 30 VIN = 7.5V VIN = 5.5V 25 VIN = 2.5V (MAX6190/MAX6191 ONLY)
10
10
1
1
0.1 0.01 0.1 1 10 100 1k 10k 100k 1M FREQUENCY (Hz)
0.1 0.01 0.1 1 10 100 1k 10k 100k 1M FREQUENCY (Hz)
20 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
MAX6190 0.1Hz TO 10Hz OUTPUT NOISE
MAX6190 toc16
MAX6195 0.1Hz TO 10Hz OUTPUT NOISE
MAX6190 toc17
MAX6190 TURN-ON TRANSIENT
MAX6190 toc18
VIN 1V/div
VOUT 10V/div
VOUT 20V/div VOUT 1V/div
1s/div
1s/div
10s/div
10
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Precision, Micropower, Low-Dropout Voltage References
Typical Operating Characteristics (continued)
(VIN = 5V for MAX6190/1/2/3/4/8, VIN = 5.5V for MAX6195; IOUT = 0; TA = +25C; unless otherwise noted.) (Note 5)
MAX6190-MAX6195/MAX6198
MAX6190 LOAD-TRANSIENT RESPONSE
MAX6190 toc19
MAX6195 LOAD-TRANSIENT RESPONSE
+25A
MAX6190 toc20
MAX6195 TURN-ON TRANSIENT
MAX6190 toc21
IOUT 40A/div
-25A
IOUT 50A/div
VIN 2V/div
VOUT 20mV/div
VOUT 50mV/div
VOUT 2V/div
10s/div IOUT = 25A, AC-COUPLED
20s/div VIN = 5.5V, IOUT = 25A, AC-COUPLED
10s/div
MAX6190 LOAD-TRANSIENT RESPONSE
MAX6190 toc22
MAX6195 LOAD-TRANSIENT RESPONSE
+500A
MAX6190 toc23
MAX6190 LINE-TRANSIENT RESPONSE
MAX6190 toc24
IOUT 1mA/div
IOUT -500A 00A/div
VIN 200mV/div
VOUT 00mV/div VOUT 0.2V/div VOUT 100mV/div
10s/div IOUT = 500A, AC-COUPLED
20s/div VIN = 5.5V, IOUT = 500A, AC-COUPLED
2.5s/div VIN = 5V 0.25V, AC-COUPLED
MAX6195 LINE-TRANSIENT RESPONSE
MAX6190 toc25
VIN 200mV/div
VOUT 100mV/div
2s/div VIN = 5.5V 0.25V, AC-COUPLED
Note 5: Many of the Typical Operating Characteristics of the MAX6190 family are extremely similar. The extremes of these characteristics are found in the MAX6190 (1.2V output) and the MAX6195 (5.0V output) devices. The Typical Operating Characteristics of the remainder of the MAX6190 family typically lie between these two extremes and can be estimated based on their output voltage.
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Precision, Micropower, Low-Dropout Voltage References MAX6190-MAX6195/MAX6198
Pin Description
PIN 1, 3, 5, 7, 8 2 4 6 NAME N.C. IN GND OUT FUNCTION No Connection. Not internally connected. Supply Voltage Input Ground Reference Voltage Output
Detailed Description
The MAX6190-MAX6195/MAX6198 precision bandgap references use a proprietary curvature-correction circuit and laser-trimmed thin-film resistors, resulting in a low temperature coefficient of <5ppm/C and initial accuracy of better than 0.1%. These devices can sink and source up to 500A with <200mV of dropout voltage, making them attractive for use in low-voltage applications.
voltage. Additionally, shunt-mode references have to be biased at the maximum expected load current, even if the load current is not present all the time. In the series-mode MAX6190 family, the load current is drawn from the input voltage only when required, so supply current is not wasted and efficiency is maximized at all input voltages. This improved efficiency can help reduce power dissipation and extend battery life. When the supply voltage is below the minimum specified input voltage (as during turn-on), the devices can draw up to 200A beyond the nominal supply current. The input voltage source must be capable of providing this current to ensure reliable turn-on.
Output Voltage Hysteresis
Output voltage 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 temperature hysteresis value is 75ppm.
Applications Information
Output/Load Capacitance
Devices in this family do not require an output capacitance for frequency stability. They are stable for capacitive loads from 0 to 2.2nF. However, in applications where the load or the supply can experience step changes, an output capacitor will reduce the amount of overshoot (or undershoot) and assist the circuit's transient response. Many applications do not need an external capacitor, and this family can offer a significant advantage in these applications when board space is critical.
Turn-On Time
These devices typically turn on and settle to within 0.1% of their final value in 30s to 220s, depending on the device. The turn-on time can increase up to 1.5ms with the device operating at the minimum dropout voltage and the maximum load.
Positive and Negative Low-Power Voltage Reference
Figure 1 shows a typical method for developing a bipolar reference. The circuit uses a MAX681 voltage doubler/inverter charge-pump converter to power an ICL7652, thus creating a positive as well as a negative reference voltage.
Supply Current
The quiescent supply current of these series-mode references is a maximum of 35A and is virtually independent of the supply voltage, with only a 0.8A/V variation with supply voltage. Unlike series references, shuntmode references operate with a series resistor connected to the power supply. The quiescent current of a shunt-mode reference is thus a function of the input
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Precision, Micropower, Low-Dropout Voltage References MAX6190-MAX6195/MAX6198
VS VCC V+ 2VS IN VOUT +REF OUTPUT
MAX681
GND
MAX6190- MAX6195 MAX6198
GND
1M, 0.1% V+ OUTPUT
ICL7652
V1M, 0.1% 10nF -REF OUTPUT
-2VS
Figure 1. Positive and Negative References from Single 3V or 5V Supply
Ordering Information (continued)
PART MAX6193AESA MAX6193BESA MAX6193CESA MAX6194AESA MAX6194BESA MAX6194CESA MAX6195AESA MAX6195BESA MAX6195CESA MAX6198AESA MAX6198BESA MAX6198CESA TEMP RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 8 SO 8 SO 8 SO 8 SO 8 SO 8 SO 8 SO 8 SO 8 SO 8 SO 8 SO 8 SO
*
Typical Operating Circuit
+SUPPLY INPUT (SEE SELECTOR GUIDE ON FIRST PAGE)
IN OUT REFERENCE OUT
MAX6190- MAX6195 MAX6198
2.2nF MAX*
GND
*CAPACITORS ARE OPTIONAL
Chip Information
TRANSISTOR COUNT: 70
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13
Precision, Micropower, Low-Dropout Voltage References MAX6190-MAX6195/MAX6198
Package Information
SOICN.EPS
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.
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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