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19-2211; Rev 2; 12/02
Precision, Micropower, 1.8V Supply, Low-Dropout, SOT23 Voltage Reference
General Description
The MAX6018 is a precision, low-voltage, low-dropout, micropower voltage reference in a SOT23 package. This three-terminal reference operates with an input voltage from (VOUT + 200mV) to 5.5V, and is available with output voltage options of 1.2V, 1.6V, 1.8V, and 2.048V The MAX6018 voltage reference consumes less than 5A (max) of supply current and can source and sink up to 1mA of load current. Unlike conventional shuntmode (two-terminal) references that waste supply current and require an external resistor, devices in the MAX6018 family offer a supply current that is virtually independent of supply voltage (with only 0.1A/V variation with supply voltage) and do not require an external resistor. The MAX6018 has initial accuracies of 0.2% (A grade) and 0.4% (B grade) and temperature drift of 50ppm/C (max). The low-dropout voltage and the ultra-low, supply voltage-independent supply current make this device ideal for two-cell alkaline, end-of-life, battery-monitoring systems. The MAX6018 is available in a tiny 3-pin SOT23 package. o 1.6V Output from 1.8V Input o Ultra-Small, 3-Pin SOT23 Package o Initial Accuracy: 0.2% (max) o Low Temperature Drift: 50ppm/C (max) o 200mV Dropout Voltage o Load Regulation (1mA Source): 700V/mA (max) o Line Regulation (VOUT + 200mV) to 5.5V: 250V/V (max) o Four Output Voltage Options: 1.2V, 1.6V, 1.8V, 2.048V
Features
o Ultra-Low Supply Current: 5A (max)
MAX6018
Ordering Information
PART TEMP RANGE PINPACKAGE 3 SOT23-3 3 SOT23-3 3 SOT23-3 3 SOT23-3 3 SOT23-3 3 SOT23-3 3 SOT23-3 3 SOT23-3 TOP MARK FZJH FZJI FZJJ FZJK FZJL FZJM FZJN FZJO
Applications
Two-Cell, Battery-Operated Systems Battery-Operated Equipment Hand-Held Equipment Data-Acquisition Systems Industrial and Process-Control Systems
MAX6018AEUR12-T -40C to +85C MAX6018BEUR12-T -40C to +85C MAX6018AEUR16-T -40C to +85C MAX6018BEUR16-T -40C to +85C MAX6018AEUR18-T -40C to +85C MAX6018BEUR18-T -40C to +85C MAX6018AEUR21-T -40C to +85C MAX6018BEUR21-T -40C to +85C
Typical Application Circuit
VCC IN OUT * REFERENCE OUT
MAX6018
1F, MAX* GND
Selector Guide
PART MAX6018AEUR12 MAX6018BEUR12 OUTPUT VOLTAGE (V) 1.263 1.263 1.600 1.600 1.800 1.800 2.048 2.048 INITIAL ACCURACY (%) 0.2 0.4 0.2 0.4 0.2 0.4 0.2 0.4
*OPTIONAL
Pin Configuration
TOP VIEW
IN 1
MAX6018AEUR16 MAX6018BEUR16 MAX6018AEUR18 MAX6018BEUR18
MAX6018
OUT 2
3
GND
MAX6018AEUR21 MAX6018BEUR21
SOT23
________________________________________________________________ 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.
Precision, Micropower, 1.8V Supply, Low-Dropout, SOT23 Voltage Reference MAX6018
ABSOLUTE MAXIMUM RATINGS
(Voltages Referenced to GND) VIN ............................................................................-0.3V to +6V Output Short-Circuit Duration to GND or VIN ............Continuous Continuous Power Dissipation (TA = +70C) 3-Pin SOT23 (derate 4.0mW/C above +70C).............320mW Operating Temperature Range ...........................-40C to +85C 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 (MAX6018_12-1.263V)
(VIN = 1.8V; COUT = 47nF, IOUT = 0; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER OUTPUT Output Voltage Output Voltage Temperature Drift Line Regulation Load Regulation Short-Circuit Current Long-Term Stability Thermal Hysteresis DYNAMIC CHARACTERISTICS Noise Voltage Ripple Rejection Turn-On Settling Time Capacitive-Load Stability Range INPUT Supply Voltage Range Quiescent Supply Current Change in Quiescent Supply Current vs. Input Voltage VIN IIN IIN/VIN Guaranteed by Line Regulation Test TA = +25C TA = TMIN to TMAX 1.8V VIN 5.5V 1.8 3 3 0.1 5.5 5 6 0.5 V A A/V tR COUT eOUT 0.1Hz to 10Hz 10Hz to 10kHz VIN = 1.8V 100mV (f = 120Hz) Settling to 0.1%; COUT = 5nF (Note 2) 47 45 100 85 200 1000 Vp-p VRMS dB s nF VOUT TCVOUT VOUT/ VIN VOUT/ IOUT ISC VOUT/ Time MAX6018A_12 (0.2%) MAX6018B_12 (0.4%) (Note 2) 1.8V VIN 5.5V 0 IOUT 1mA -100A IOUT 0 Sourcing to GND Sinking from VIN 1000hrs at TA = +25C (Note 4) 1.2605 1.2580 1.2630 1.2630 16 50 90 2 3 6 100 130 1.2655 1.2681 50 400 700 9 V ppm/oC V/V V/mA V/A mA ppm ppm SYMBOL CONDITIONS MIN TYP MAX UNITS
2
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Precision, Micropower, 1.8V Supply, Low-Dropout, SOT23 Voltage Reference
ELECTRICAL CHARACTERISTICS (MAX6018_16-1.600V)
(VIN = 1.8V; COUT = 47nF, IOUT = 0; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER OUTPUT Output Voltage Output Voltage Temperature Drift Line Regulation Load Regulation Dropout Voltage (Note 3) Short-Circuit Current Long-Term Stability Thermal Hysteresis DYNAMIC CHARACTERISTICS Noise Voltage Ripple Rejection Turn-On Settling Time Capacitive-Load Stability Range INPUT Supply Voltage Range Quiescent Supply Current Change in Quiescent Supply Current vs. Input Voltage VIN IIN IIN/VIN Guaranteed by Line Regulation Test TA = +25C TA = TMIN to TMAX 1.8V VIN 5.5V 1.8 3 3 0.1 5.5 5 6 0.5 V A A/V tR COUT eOUT 0.1Hz to 10Hz 10Hz to 10kHz VIN = 1.8V 100mV (f = 120Hz) Settling to 0.1%; COUT = 5nF (Note 2) 0.1 40 150 85 200 1000 Vp-p VRMS dB s nF VOUT TCVOUT VOUT/ VIN VOUT/ IOUT VIN - VOUT ISC VOUT/ Time MAX6018A_16 (0.2%) MAX6018B_16 (0.4%) (Note 2) 1.8V VIN 5.5V 0 IOUT 1mA -750A IOUT 0 IOUT = 1mA Sourcing to GND Sinking from VIN 1000hrs at TA = +25C (Note 4) TA = +25C TA = +25C 1.5968 1.5936 1.6000 1.6000 16 40 90 0.6 100 6 2 100 130 1.6032 1.6064 50 250 700 50 200 V ppm/oC V/V V/mA V/A mV mA ppm ppm SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX6018
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Precision, Micropower, 1.8V Supply, Low-Dropout, SOT23 Voltage Reference MAX6018
ELECTRICAL CHARACTERISTICS (MAX6018_18-1.800V)
(VIN = 2.0V; COUT = 47nF, IOUT = 0; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER OUTPUT Output Voltage Output Voltage Temperature Drift Line Regulation Load Regulation Dropout Voltage (Note 3) Short-Circuit Current Long-Term Stability Thermal Hysteresis DYNAMIC CHARACTERISTICS Noise Voltage Ripple Rejection Turn-On Settling Time Capacitive-Load Stability Range INPUT Supply Voltage Range Quiescent Supply Current Change in Quiescent Supply Current vs. Input Voltage VIN IIN IIN/VIN Guaranteed by Line Regulation Test TA = +25C TA = TMIN to TMAX 2V VIN 5.5V 2.0 3 3 0.1 5.5 5 6 0.5 V A A/V tR COUT eOUT 0.1Hz to 10Hz 10Hz to 10kHz VIN = 2.0V 100mV (f = 120Hz) Settling to 0.1%; COUT = 5nF (Note 2) 0.1 45 160 85 200 1000 Vp-p VRMS dB s nF VOUT TCVOUT VOUT/ VIN VOUT/ IOUT VIN - VOUT ISC VOUT/ Time MAX6018A_18 (0.2%) MAX6018B_18 (0.4%) (Note 2) 2.0V VIN 5.5V 0 IOUT 1mA -1mA IOUT 0 IOUT = 1mA Sourcing to GND Sinking from VIN 1000hrs at TA = +25C (Note 4) TA = +25C TA = +25C 1.7964 1.7928 1.8000 1.8000 16 40 90 0.4 100 7.5 3 100 130 1.8036 1.8072 50 275 800 50 200 V ppm/oC V/V V/mA V/A mV mA ppm ppm SYMBOL CONDITIONS MIN TYP MAX UNITS
4
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Precision, Micropower, 1.8V Supply, Low-Dropout, SOT23 Voltage Reference
ELECTRICAL CHARACTERISTICS (MAX6018_21-2.048V)
(VIN = 2.25V; COUT = 47nF, IOUT = 0; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER OUTPUT Output Voltage Output Voltage Temperature Drift Line Regulation Load Regulation Dropout Voltage (Note 3) Short-Circuit Current Long-Term Stability Thermal Hysteresis DYNAMIC CHARACTERISTICS Noise Voltage Ripple Rejection Turn-On Settling Time Capacitive-Load Stability Range INPUT Supply Voltage Range Quiescent Supply Current Change in Quiescent Supply Current vs. Input Voltage VIN IIN IIN/VIN Guaranteed by Line Regulation Test TA = +25C TA = TMIN to TMAX 2.25V VIN 5.5V 2.25 3 3 0.1 5.5 5 6 0.5 V A A/V tR COUT eOUT 0.1Hz to 10Hz 10Hz to 10kHz VIN = 2.25V 100mV (f = 120Hz) Settling to 0.1%; COUT = 5nF (Note 2) 0.1 50 175 85 200 1000 Vp-p VRMS dB s nF VOUT TCVOUT VOUT/ VIN VOUT/ IOUT VIN - VOUT ISC VOUT/ Time MAX6018A_21 (0.2%) MAX6018B_21 (0.4%) (Note 2) 2.25V VIN 5.5V 0 IOUT 1mA -1mA IOUT 0 IOUT = 1mA Sourcing to GND Sinking from VIN 1000hrs at TA = +25C (Note 4) TA = +25C TA = +25C 2.0439 2.0398 2.0480 2.0480 16 45 90 0.3 100 10 4 100 130 2.0521 2.0562 50 330 1000 50 200 V ppm/oC V/V V/mA V/A mV mA ppm ppm SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX6018
Note 1: Devices are 100% production tested at TA = +25C and are guaranteed by design from TA = TMIN to TMAX. Note 2: Not production tested. Guaranteed by design. Note 3: Dropout voltage is the minimum input voltage at which VOUT changes 0.2% from VOUT at rated VIN and is guaranteed by Load Regulation Test. Note 4: Thermal hysteresis is defined as the change in TA = +25C output voltage before and after temperature cycling of the device (from TA = TMIN to TMAX). Initial measurement at TA = +25C is followed by temperature cycling the device to TA = +85C then to TA = -40C and another measurement at TA = +25C is compared to the original measurement at TA = +25C.
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5
Precision, Micropower, 1.8V Supply, Low-Dropout, SOT23 Voltage Reference MAX6018
Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
MAX6018_12 OUTPUT VOLTAGE DRIFT vs. TEMPERATURE
MAX6018 toc01
MAX6018_21 OUTPUT VOLTAGE DRIFT vs. TEMPERATURE
MAX6018 toc02
MAX6018_12 LONG-TERM DRIFT
MAX6018 toc03
1.2635
2.050 2.049 OUTPUT VOLTAGE (V) 2.048 2.047 2.046 2.045 2.044
1.266 1.265 OUTPUT VOLTAGE (V) 1.264 1.263 1.262 1.261 1.260
1.2630 OUTPUT VOLTAGE (V)
1.2625
1.2620
1.2615
1.2610 -50 -25 0 25 50 75 100 TEMPERATURE (C)
2.043 -50 -25 0 25 50 75 100 TEMPERATURE (C)
0 100 200 300 400 500 600 700 800 900 1000 TIME (HOURS)
MAX6018_21 LONG-TERM DRIFT
MAX6018 toc04
MAX6018_12 LINE REGULATION
MAX6018 toc05
MAX6018_21 LINE REGULATION
MAX6018 toc06
2.050
0.25 OUTPUT VOLTAGE CHARGE (mV)
0.30 OUTPUT VOLTAGE CHANGE (mV) 0.25 0.20 0.15 0.10 0.05 TA = +25C 0 TA = -40C TA = +85C
2.049 OUTPUT VOLTAGE (V)
0.20 TA = +85C 0.15 TA = -40C 0.10 TA = +25C 0.05
2.048
2.047
2.046
2.045 0 100 200 300 400 500 600 700 800 900 1000 TIME (HOURS)
0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 INPUT VOLTAGE (V)
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
INPUT VOLTAGE (V)
MAX6018_21 DROPOUT VOLTAGE vs. SOURCE CURRENT
MAX6018 toc07
MAX6018_12 LOAD REGULATION
0.7 OUTPUT VOLTAGE CHANGE (mV) 0.6 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 TA = +25C TA = -40C TA = +85C
MAX6018 toc08
MAX6018_21 LOAD REGULATION
0.6 OUTPUT VOLTAGE CHANGE (mV) 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 TA = +25C TA = +85C TA = -40C
MAX6018 toc09
140 120 DROPOUT VOLTAGE (mV) 100 TA = +25C 80 60 40 20 0 0 0.2 0.4 0.6 0.8 1.0 TA = -40C TA = +85C
0.8
0.7
1.2
-1.0 -0.8 -0.6 -0.4 -0.2 0
0.2 0.4 0.6 0.8 1.0
-1.0 -0.8 -0.6 -0.4 -0.2 0
0.2 0.4 0.6 0.8 1.0
SOURCE CURRENT (mA)
LOAD CURRENT (mA)
SOURCE CURRENT (mA)
6
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Precision, Micropower, 1.8V Supply, Low-Dropout, SOT23 Voltage Reference MAX6018
Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. INPUT VOLTAGE
MAX6018 toc11 MAX6018 toc10
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
90 80 70 60 PSRR (dB) 50 40 30 20 10 0 1 10 100 1k 10k 100k FREQUENCY (Hz) 3.40 3.35 3.30 SUPPLY CURRENT (A) 3.25 3.20 3.15 3.10 3.05 3.00 2.95 2.90 1 2
OUTPUT IMPEDANCE vs. FREQUENCY
10k OUTPUT IMPEDANCE () 1k 100 10 1 0.1 0.01
MAX6018 toc12
100k
MAX6018_12 MAX6018_16 MAX6018_21
MAX6018_18
3
4
5
6
0.01
0.1
1
10
100
1k
10k
INPUT VOLTAGE (V)
FREQUENCY (Hz)
SUPPLY CURRENT vs. TEMPERATURE
MAX6018 toc13
MAX6018_21 0.1Hz TO 10Hz OUTPUT NOISE
MAX6018 toc14
MAX6018_12 TURN-ON TRANSIENT
COUT = 5nF
MAX6018 toc15
4.0 3.8 3.6 SUPPLY CURRENT (A) 3.4 3.2 3.0 2.8 2.6 2.4 2.2 2.0 -50 -25 0 25 50 75 VIN = 2.25V VIN = 3V VIN = 5.5V
VIN 1V/div 20V/div VOUT 500mV/div
100
10s/div
100s/div
TEMPERATURE (C)
MAX6018_21 TURN-ON TRANSIENT
MAX6018 toc16
MAX6018_21 TURN-OFF TRANSIENT
MAX6018 toc17
MAX6018_12 LOAD-TRANSIENT RESPONSE
MAX6018 toc18
COUT = 5nF VIN 1V/div
COUT = 5nF VIN 1V/div
COUT = 150pF -300A IOUT 500A/div +1mA
VOUT 1V/div
VOUT 1V/div
VOUT 500mV/div
50s/div
2ms/div
100s/div
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7
Precision, Micropower, 1.8V Supply, Low-Dropout, SOT23 Voltage Reference MAX6018
Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
MAX6018_21 LOAD-TRANSIENT RESPONSE
MAX6018 toc19
MAX6018_12 LINE-TRANSIENT RESPONSE
MAX6018 toc20
MAX6018_21 LINE-TRANSIENT RESPONSE
MAX6018 toc21
COUT = 150pF IOUT 1mA/div
COUT = 550pF -1mA VIN 200mV/div +1mA VIN 200mV/div
COUT = 550pF
VOUT 1V/div
VOUT 50mV/div
VOUT 50mV/div
100s/div
100s/div
100s/div
Detailed Description
The MAX6018 is a precision, low-voltage, low-dropout, micropower, bandgap voltage reference in a SOT23 package. This three-terminal reference operates with an input voltage from (VOUT + 200mV) to 5.5V, and is available with output voltage options of 1.2V, 1.6V, 1.8V, and 2.048V. These devices can source up to 1mA with <200mV of dropout voltage, making them attractive for use in low-voltage applications.
PIN 1 NAME IN
Pin Description
FUNCTION Supply Voltage Input. Bypass with a 0.1F capacitor to ground. Reference Voltage Output. Bypass with at least 100pF to ground. (See Output/Load Capacitance section). Ground
2 3
OUT GND
Applications Information
Output/Load Capacitance
These devices require a minimum of 100pF load to maintain output stability. They remain stable for capacitive loads as high as 1F. In applications where the load or the supply can experience step changes, a larger output capacitor reduces the amount of overshoot (or undershoot) and assists the circuit's transient response. Otherwise, applications may not need more than 100pF.
Turn-On Time
These devices typically turn on and settle to within 0.1% of their final value in 200s. The turn-on time can increase up to 1ms with the device operating at the minimum dropout voltage and the maximum load.
Chip Information
TRANSISTOR COUNT: 87 PROCESS: BiCMOS
Supply Current
The 5A maximum supply current varies only 0.1A/V with the supply voltage. When the supply voltage is below the minimum-specified input voltage (as during turn-on), the devices can draw up to 20A beyond the nominal supply current. The input voltage source must be capable of providing this current to ensure reliable turn-on.
8 _______________________________________________________________________________________
Precision, Micropower, 1.8V Supply, Low-Dropout, SOT23 Voltage Reference
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.)
SOT23 L.EPS
MAX6018
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 _____________________ 9 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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