19-2211; Rev 2; 12/02 Precision, Micropower, 1.8V Supply, Low-Dropout, SOT23 Voltage Reference 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 5µA (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 0.1µA/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. Applications Features ♦ Ultra-Low Supply Current: 5µA (max) ♦ 1.6V Output from 1.8V Input ♦ Ultra-Small, 3-Pin SOT23 Package ♦ Initial Accuracy: ±0.2% (max) ♦ Low Temperature Drift: 50ppm/°C (max) ♦ 200mV Dropout Voltage ♦ Load Regulation (1mA Source): 700µV/mA (max) ♦ Line Regulation (VOUT + 200mV) to 5.5V: 250µV/V (max) ♦ Four Output Voltage Options: 1.2V, 1.6V, 1.8V, 2.048V Ordering Information TEMP RANGE PINPACKAGE TOP MARK MAX6018AEUR12-T -40°C to +85°C 3 SOT23-3 FZJH MAX6018BEUR12-T -40°C to +85°C 3 SOT23-3 FZJI MAX6018AEUR16-T -40°C to +85°C 3 SOT23-3 FZJJ MAX6018BEUR16-T -40°C to +85°C 3 SOT23-3 FZJK MAX6018AEUR18-T -40°C to +85°C 3 SOT23-3 FZJL MAX6018BEUR18-T -40°C to +85°C 3 SOT23-3 FZJM MAX6018AEUR21-T -40°C to +85°C 3 SOT23-3 FZJN MAX6018BEUR21-T -40°C to +85°C 3 SOT23-3 FZJO PART Two-Cell, Battery-Operated Systems Battery-Operated Equipment Hand-Held Equipment Data-Acquisition Systems Industrial and Process-Control Systems Typical Application Circuit VCC IN OUT * REFERENCE OUT Selector Guide MAX6018 1µF, MAX* GND *OPTIONAL Pin Configuration TOP VIEW IN 1 MAX6018 OUT 2 OUTPUT VOLTAGE (V) INITIAL ACCURACY (%) MAX6018AEUR12 1.263 ±0.2 MAX6018BEUR12 1.263 ±0.4 MAX6018AEUR16 1.600 ±0.2 MAX6018BEUR16 1.600 ±0.4 MAX6018AEUR18 1.800 ±0.2 MAX6018BEUR18 1.800 ±0.4 MAX6018AEUR21 2.048 ±0.2 MAX6018BEUR21 2.048 ±0.4 PART 3 GND SOT23 ________________________________________________________________ Maxim Integrated Products 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. 1 MAX6018 General Description MAX6018 Precision, Micropower, 1.8V Supply, Low-Dropout, SOT23 Voltage Reference 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 = +70°C) 3-Pin SOT23 (derate 4.0mW/°C above +70°C).............320mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C 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 = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX MAX6018A_12 (0.2%) 1.2605 1.2630 1.2655 MAX6018B_12 (0.4%) 1.2580 1.2630 1.2681 UNITS OUTPUT Output Voltage VOUT V Output Voltage Temperature Drift TCVOUT (Note 2) 16 50 ppm/oC Line Regulation ∆VOUT/ ∆VIN 1.8V ≤ VIN ≤ 5.5V 50 400 µV/V Load Regulation ∆VOUT/ ∆IOUT 0 ≤ IOUT ≤ 1mA 90 700 µV/mA -100µA ≤ IOUT ≤ 0 2 9 µV/µA Sourcing to GND 3 Sinking from VIN 6 Short-Circuit Current ISC Long-Term Stability ∆VOUT/ Time Thermal Hysteresis mA 1000hrs at TA = +25°C 100 ppm (Note 4) 130 ppm DYNAMIC CHARACTERISTICS Noise Voltage eOUT Ripple Rejection Turn-On Settling Time Capacitive-Load Stability Range tR COUT 0.1Hz to 10Hz 45 µVp-p 10Hz to 10kHz 100 µVRMS VIN = 1.8V ±100mV (f = 120Hz) 85 dB Settling to 0.1%; COUT = 5nF 200 (Note 2) 47 Guaranteed by Line Regulation Test 1.8 µs 1000 nF 5.5 V INPUT Supply Voltage Range Quiescent Supply Current Change in Quiescent Supply Current vs. Input Voltage 2 VIN IIN ∆IIN/∆VIN TA = +25°C 3 5 TA = TMIN to TMAX 3 6 1.8V ≤ VIN ≤ 5.5V 0.1 0.5 _______________________________________________________________________________________ µA µA/V Precision, Micropower, 1.8V Supply, Low-Dropout, SOT23 Voltage Reference (VIN = 1.8V; COUT = 47nF, IOUT = 0; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS OUTPUT Output Voltage VOUT MAX6018A_16 (0.2%) TA = +25°C 1.5968 1.6000 1.6032 MAX6018B_16 (0.4%) TA = +25°C 1.5936 1.6000 1.6064 V Output Voltage Temperature Drift TCVOUT (Note 2) 16 50 ppm/oC Line Regulation ∆VOUT/ ∆VIN 1.8V ≤ VIN ≤ 5.5V 40 250 µV/V Load Regulation ∆VOUT/ ∆IOUT 0 ≤ IOUT ≤ 1mA 90 700 µV/mA -750µA ≤ IOUT ≤ 0 0.6 50 µV/µA IOUT = 1mA 100 200 mV Dropout Voltage (Note 3) VIN - VOUT Short-Circuit Current ISC Long-Term Stability ∆VOUT/ Time Thermal Hysteresis Sourcing to GND 6 Sinking from VIN 2 mA 1000hrs at TA = +25°C 100 ppm (Note 4) 130 ppm DYNAMIC CHARACTERISTICS Noise Voltage eOUT Ripple Rejection 0.1Hz to 10Hz 40 µVp-p 10Hz to 10kHz 150 µVRMS 85 dB VIN = 1.8V ±100mV (f = 120Hz) Turn-On Settling Time Capacitive-Load Stability Range tR COUT Settling to 0.1%; COUT = 5nF 200 (Note 2) 0.1 Guaranteed by Line Regulation Test 1.8 µs 1000 nF 5.5 V INPUT Supply Voltage Range Quiescent Supply Current Change in Quiescent Supply Current vs. Input Voltage VIN IIN ∆IIN/∆VIN TA = +25°C 3 5 TA = TMIN to TMAX 3 6 1.8V ≤ VIN ≤ 5.5V 0.1 0.5 µA µA/V _______________________________________________________________________________________ 3 MAX6018 ELECTRICAL CHARACTERISTICS (MAX6018_16–1.600V) MAX6018 Precision, Micropower, 1.8V Supply, Low-Dropout, SOT23 Voltage Reference 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 = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS OUTPUT Output Voltage VOUT MAX6018A_18 (0.2%) TA = +25°C 1.7964 1.8000 1.8036 MAX6018B_18 (0.4%) TA = +25°C 1.7928 1.8000 1.8072 V Output Voltage Temperature Drift TCVOUT (Note 2) 16 50 ppm/oC Line Regulation ∆VOUT/ ∆VIN 2.0V ≤ VIN ≤ 5.5V 40 275 µV/V Load Regulation ∆VOUT/ ∆IOUT 0 ≤ IOUT ≤ 1mA 90 800 µV/mA Dropout Voltage (Note 3) VIN - VOUT Short-Circuit Current ISC Long-Term Stability ∆VOUT/ Time Thermal Hysteresis -1mA ≤ IOUT ≤ 0 0.4 50 µV/µA IOUT = 1mA 100 200 mV Sourcing to GND 7.5 Sinking from VIN 3 mA 1000hrs at TA = +25°C 100 ppm (Note 4) 130 ppm DYNAMIC CHARACTERISTICS Noise Voltage eOUT Ripple Rejection Turn-On Settling Time Capacitive-Load Stability Range tR COUT 0.1Hz to 10Hz 45 µVp-p 10Hz to 10kHz 160 µVRMS VIN = 2.0V ±100mV (f = 120Hz) 85 dB Settling to 0.1%; COUT = 5nF 200 (Note 2) 0.1 Guaranteed by Line Regulation Test 2.0 µs 1000 nF 5.5 V INPUT Supply Voltage Range Quiescent Supply Current Change in Quiescent Supply Current vs. Input Voltage 4 VIN IIN ∆IIN/∆VIN TA = +25°C 3 5 TA = TMIN to TMAX 3 6 0.1 0.5 2V ≤ VIN ≤ 5.5V _______________________________________________________________________________________ µA µA/V Precision, Micropower, 1.8V Supply, Low-Dropout, SOT23 Voltage Reference (VIN = 2.25V; COUT = 47nF, IOUT = 0; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS OUTPUT Output Voltage VOUT MAX6018A_21 (0.2%) TA = +25°C 2.0439 2.0480 2.0521 MAX6018B_21 (0.4%) TA = +25°C 2.0398 2.0480 2.0562 V Output Voltage Temperature Drift TCVOUT (Note 2) 16 50 ppm/oC Line Regulation ∆VOUT/ ∆VIN 2.25V ≤ VIN ≤ 5.5V 45 330 µV/V Load Regulation ∆VOUT/ ∆IOUT 0 ≤ IOUT ≤ 1mA 90 1000 µV/mA Dropout Voltage (Note 3) VIN - VOUT Short-Circuit Current ISC Long-Term Stability ∆VOUT/ Time Thermal Hysteresis -1mA ≤ IOUT ≤ 0 0.3 50 µV/µA IOUT = 1mA 100 200 mV Sourcing to GND 10 Sinking from VIN 4 mA 1000hrs at TA = +25°C 100 ppm (Note 4) 130 ppm DYNAMIC CHARACTERISTICS Noise Voltage eOUT Ripple Rejection Turn-On Settling Time Capacitive-Load Stability Range tR COUT 0.1Hz to 10Hz 50 µVp-p 10Hz to 10kHz 175 µVRMS VIN = 2.25V ±100mV (f = 120Hz) 85 dB Settling to 0.1%; COUT = 5nF 200 (Note 2) 0.1 µs 1000 nF 5.5 V INPUT Supply Voltage Range Quiescent Supply Current Change in Quiescent Supply Current vs. Input Voltage VIN IIN ∆IIN/∆VIN Guaranteed by Line Regulation Test 2.25 TA = +25°C 3 5 TA = TMIN to TMAX 3 6 2.25V ≤ VIN ≤ 5.5V 0.1 0.5 µA µA/V Note 1: Devices are 100% production tested at TA = +25°C 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 = +25°C output voltage before and after temperature cycling of the device (from TA = TMIN to TMAX). Initial measurement at TA = +25°C is followed by temperature cycling the device to TA = +85°C then to TA = -40°C and another measurement at TA = +25°C is compared to the original measurement at TA = +25°C. _______________________________________________________________________________________ 5 MAX6018 ELECTRICAL CHARACTERISTICS (MAX6018_21–2.048V) Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) MAX6018_12 OUTPUT VOLTAGE DRIFT vs. TEMPERATURE 1.2620 2.049 2.048 2.047 2.046 2.045 MAX6018 toc03 1.266 1.265 OUTPUT VOLTAGE (V) 1.2625 MAX6018_12 LONG-TERM DRIFT MAX6018 toc02 2.050 OUTPUT VOLTAGE (V) 1.2630 OUTPUT VOLTAGE (V) MAX6018_21 OUTPUT VOLTAGE DRIFT vs. TEMPERATURE MAX6018 toc01 1.2635 1.264 1.263 1.262 1.2615 1.261 1.2610 2.043 0 25 50 75 -50 -25 0 25 50 75 100 1.260 0 100 200 300 400 500 600 700 800 900 1000 TEMPERATURE (°C) TEMPERATURE (°C) TIME (HOURS) MAX6018_21 LONG-TERM DRIFT MAX6018_12 LINE REGULATION MAX6018_21 LINE REGULATION 2.049 2.048 2.047 2.046 0.25 0.20 TA = +85°C 0.15 TA = -40°C 0.10 TA = +25°C 0.05 0.30 OUTPUT VOLTAGE CHANGE (mV) MAX6018 toc04 2.050 OUTPUT VOLTAGE (V) 100 MAX6018 toc05 -25 OUTPUT VOLTAGE CHARGE (mV) -50 MAX6018 toc06 2.044 TA = -40°C 0.25 TA = +85°C 0.20 0.15 0.10 0.05 TA = +25°C 2.045 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 2.0 5.5 2.5 3.0 3.5 4.0 4.5 INPUT VOLTAGE (V) INPUT VOLTAGE (V) MAX6018_21 DROPOUT VOLTAGE vs. SOURCE CURRENT MAX6018_12 LOAD REGULATION MAX6018_21 LOAD REGULATION 100 TA = +25°C 80 60 TA = -40°C 40 20 0.5 0.4 TA = +25°C 0.3 TA = -40°C 0.2 0.1 0 -0.2 0 0.2 0.4 0.6 0.8 SOURCE CURRENT (mA) 1.0 1.2 5.5 0.6 0.5 0.4 TA = -40°C 0.3 TA = +85°C 0.2 0.1 0 TA = +25°C -0.1 -0.1 0 5.0 MAX6018 toc09 TA = +85°C 0.6 0.7 OUTPUT VOLTAGE CHANGE (mV) TA = +85°C 0.7 OUTPUT VOLTAGE CHANGE (mV) MAX6018 toc07 120 0.8 MAX6018 toc08 TIME (HOURS) 140 6 0 0 0 100 200 300 400 500 600 700 800 900 1000 DROPOUT VOLTAGE (mV) MAX6018 Precision, Micropower, 1.8V Supply, Low-Dropout, SOT23 Voltage Reference -0.2 -1.0 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1.0 LOAD CURRENT (mA) -1.0 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1.0 SOURCE CURRENT (mA) _______________________________________________________________________________________ Precision, Micropower, 1.8V Supply, Low-Dropout, SOT23 Voltage Reference SUPPLY CURRENT vs. INPUT VOLTAGE 30 MAX6018_21 3.15 3.10 3.05 20 3.00 10 2.95 1 10 100 1k 10k 2 3 4 5 FREQUENCY (Hz) INPUT VOLTAGE (V) SUPPLY CURRENT vs. TEMPERATURE MAX6018_21 0.1Hz TO 10Hz OUTPUT NOISE 3.8 3.6 6 0.01 0.1 1 10 100 1k 10k MAX6018_12 TURN-ON TRANSIENT VIN = 5.5V 3.4 1 FREQUENCY (Hz) MAX6018 toc13 4.0 10 0.01 1 100k 100 0.1 MAX6018_18 2.90 0 SUPPLY CURRENT (µA) 3.20 1k COUT = 5nF MAX6018 toc15 40 OUTPUT IMPEDANCE (Ω) 50 MAX6018_16 3.25 10k MAX6018 toc14 PSRR (dB) 60 MAX6018_12 3.30 SUPPLY CURRENT (µA) 70 3.35 100k MAX6018 toc11 80 OUTPUT IMPEDANCE vs. FREQUENCY 3.40 MAX6018 toc10 90 MAX6018 toc12 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY MAX6018 Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) VIN 1V/div 3.2 20µV/div 3.0 2.8 VIN = 3V VOUT 500mV/div 2.6 2.4 VIN = 2.25V 2.2 2.0 -50 -25 0 25 50 75 100 100µs/div 10s/div TEMPERATURE (°C) MAX6018_21 TURN-OFF TRANSIENT MAX6018_21 TURN-ON TRANSIENT MAX6018_12 LOAD-TRANSIENT RESPONSE COUT = 5nF VIN 1V/div MAX6018 toc17 VIN 1V/div MAX6018 toc16 MAX6018 toc18 COUT = 5nF COUT = 150pF -300µA IOUT 500µA/div +1mA VOUT 500mV/div VOUT 1V/div VOUT 1V/div 50µs/div 2ms/div 100µs/div _______________________________________________________________________________________ 7 MAX6018 Precision, Micropower, 1.8V Supply, Low-Dropout, SOT23 Voltage Reference Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) MAX6018_12 LINE-TRANSIENT RESPONSE MAX6018_21 LOAD-TRANSIENT RESPONSE MAX6018 toc20 MAX6018 toc19 COUT = 150pF MAX6018_21 LINE-TRANSIENT RESPONSE MAX6018 toc21 COUT = 550pF COUT = 550pF -1mA IOUT 1mA/div VIN 200mV/div VIN 200mV/div VOUT 50mV/div VOUT 50mV/div +1mA VOUT 1V/div 100µs/div 100µs/div 100µs/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. 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 1µF. 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. Pin Description PIN NAME FUNCTION 1 IN Supply Voltage Input. Bypass with a 0.1µF capacitor to ground. 2 OUT Reference Voltage Output. Bypass with at least 100pF to ground. (See Output/Load Capacitance section). 3 GND Ground Turn-On Time These devices typically turn on and settle to within 0.1% of their final value in 200µs. 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 5µA maximum supply current varies only 0.1µA/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 20µA 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 SOT23 L.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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. MAX6018 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.)