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| 19-2507; Rev 0; 7/02 Ultra-Low-Power Series Voltage Reference General Description The MAX6129 micropower, low-dropout bandgap voltage reference combines ultra-low supply current and low drift in a miniature 5-pin SOT23 surface-mount package that uses 70% less board space than comparable devices in an SO package. This series-mode voltage reference sources up to 4mA and sinks up to 1mA of load current. A wide 2.5V to 12.6V supply range, ultra-low 5.25A (max) supply current, and a low 200mV dropout voltage make these devices ideal for battery-operated systems. An initial accuracy of 0.4% and a 40ppm/C (max) temperature coefficient make the MAX6129 suitable for precision applications. Additionally, an internal compensation capacitor eliminates the need for an external compensation capacitor and ensures stability with load capacitances up to 10F. The MAX6129 provides six output voltages of 2.048V, 2.5V, 3V, 3.3V, 4.096V, and 5V. The MAX6129 is available in a 5-pin SOT23 package and is specified over the extended temperature range (-40C to +85C). o 4mA Output Source Current o 1mA Output Sink Current o 0.4% (max) Initial Accuracy o 40ppm/C (max) Temperature Coefficient o 2.5V to 12.6V Supply Range o Low 200mV Dropout o Stable with Capacitive Loads Up to 10F o No External Capacitors Required o Miniature 5-Pin SOT23 Package Features o Ultra-Low 5.25A (max) Supply Current MAX6129 Ordering Information PART TEMP RANGE OUTPUT PINVOLTAGE PACKAGE (V) 2.048 2.500 3.000 3.300 4.096 5.000 Applications Battery-Powered Systems Hand-Held Instruments Precision Power Supplies A/D and D/A Converters MAX6129_EUK21-T -40C to +85C 5 SOT23-5 MAX6129_EUK25-T -40C to +85C 5 SOT23-5 MAX6129_EUK30-T -40C to +85C 5 SOT23-5 MAX6129_EUK33-T -40C to +85C 5 SOT23-5 MAX6129_EUK41-T -40C to +85C 5 SOT23-5 MAX6129_EUK50-T -40C to +85C 5 SOT23-5 Note: The MAX6129 is available in A or B grades. Choose the desired grade from the Selector Guide and insert the suffix in the blank above to complete the part number. Selector Guide appears at end of data sheet. Typical Operating Circuit VIN = 2.5V TO 12.6V Pin Configuration TOP VIEW * IN IN 1 5 OUT GND 2 MAX6129 OUT MAX6129 N.C. 3 GND 4 N.C. SOT23 *CAPACITOR IS OPTIONAL ________________________________________________________________ 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. Ultra-Low-Power Series Voltage Reference MAX6129 ABSOLUTE MAXIMUM RATINGS IN to GND ...............................................................-0.3V to +13V OUT to GND ..............-0.3V to the lower of +6V and (VIN + 0.3V) Output to GND Short-Circuit Duration........................Continuous Continuous Power Dissipation (TA = +70C) 5-Pin SOT23 (derate 7.1mW/C above +70C)............571mW 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--MAX6129_21 (VOUT = 2.048V) (VIN = 2.5V, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER OUTPUT Output Voltage Output Voltage Temperature Coefficient (Notes 2, 3) Line Regulation Load Regulation Output Short-Circuit Current Long-Term Stability Thermal Hysteresis DYNAMIC CHARACTERISTICS Noise Voltage Ripple Rejection Turn-On Settling Time INPUT Supply Voltage Range Supply Current Change in Supply Current VIN IIN IIN/VIN VIN = 2.5V to 12.6V 2.5 12.6 5.25 1.5 V A A/V eOUT f = 0.1Hz to 10Hz f = 10Hz to 1kHz To VOUT = 0.1% of final value 30 115 43 450 VP-P VRMS dB s VOUT TCVOUT TA = +25C MAX6129A MAX6129B 27 0.22 2.4 60 150 140 (Note 4) IOUT = 0 to 4mA IOUT = 0 to -1mA MAX6129A (0.4%) MAX6129B (1%) 2.0398 2.0275 2.0480 2.0480 2.0562 2.0685 40 100 200 0.7 5.5 V ppm/C V/V V/A mA ppm ppm SYMBOL CONDITIONS MIN TYP MAX UNITS VOUT/VIN VIN = 2.5V to 12.6V VOUT/ IOUT ISC VOUT/time 1000 hours at +25C VOUT/VIN VIN = 2.5V 200mV, f = 120Hz tR 2 _______________________________________________________________________________________ Ultra-Low-Power Series Voltage Reference ELECTRICAL CHARACTERISTICS--MAX6129_25 (VOUT = 2.500V) (VIN = 2.7V, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER OUTPUT Output Voltage Output Voltage Temperature Coefficient (Notes 2, 3) Line Regulation Load Regulation Dropout Voltage (Note 5) Output Short-Circuit Current Long-Term Stability Thermal Hysteresis DYNAMIC CHARACTERISTICS Noise Voltage Ripple Rejection Turn-On Settling Time INPUT Supply Voltage Range Supply Current Change in Supply Current VIN IIN IIN/VIN VIN = 2.7V to 12.6V 2.7 12.6 5.75 1.5 V A A/V eOUT VOUT/VIN tR f = 0.1Hz to 10Hz f = 10Hz to 1kHz VIN = 2.7V 200mV, f = 120Hz To VOUT = 0.1% of final value 39 137 34 700 VP-P VRMS dB ms VOUT TCVOUT VOUT/VIN VOUT/IOUT VIN - VOUT ISC VOUT/time 1000 hours at +25C (Note 4) TA = +25C MAX6129A MAX6129B VIN = 2.7V to 12.6V IOUT = 0 to 4mA IOUT = 0 to -1mA IOUT = 0 IOUT = 4mA 60 150 140 30 0.1 2.5 MAX6129A (0.4%) MAX6129B (1%) 2.4900 2.4750 2.5000 2.5000 2.5100 2.5250 40 100 230 0.6 6.2 100 200 V ppm/C V/V V/A mV mA ppm ppm SYMBOL CONDITIONS MIN TYP MAX UNITS MAX6129 _______________________________________________________________________________________ 3 Ultra-Low-Power Series Voltage Reference MAX6129 ELECTRICAL CHARACTERISTICS--MAX6129_30 (VOUT = 3.000V) (VIN = 3.2V, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER OUTPUT Output Voltage Output Voltage Temperature Coefficient (Notes 2, 3) Line Regulation Load Regulation Dropout Voltage (Note 5) Output Short-Circuit Current Long-Term Stability Thermal Hysteresis DYNAMIC CHARACTERISTICS Noise Voltage Ripple Rejection Turn-On Settling Time INPUT Supply Voltage Range Supply Current Change in Supply Current VIN IIN IIN/VIN VIN = 3.2V to 12.6V 3.2 12.6 6.75 1.5 V A A/V eOUT f = 0.1Hz to 10Hz f = 10Hz to 1kHz To VOUT = 0.1% of final value 50 161 37 775 VP-P VRMS dB s VOUT TCVOUT TA = +25C MAX6129A MAX6129B 15 0.1 2.4 IOUT = 0 to 4mA IOUT = 0 to -1mA IOUT = 0 IOUT = 4mA 25 150 140 (Note 4) MAX6129A (0.4%) MAX6129B (1%) 2.9880 2.9700 3.0000 3.0000 3.0120 3.0300 40 100 250 0.6 6.5 100 200 V ppm/C V/V V/A mV mA ppm ppm SYMBOL CONDITIONS MIN TYP MAX UNITS VOUT/VIN VIN = 3.2V to 12.6V VOUT/ IOUT VIN - VOUT ISC VOUT/time 1000 hours at +25C VOUT/VIN VIN = 3.2V 200mV, f = 120Hz tR 4 _______________________________________________________________________________________ Ultra-Low-Power Series Voltage Reference ELECTRICAL CHARACTERISTICS--MAX6129_33 (VOUT = 3.300V) (VIN = 3.5V, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER OUTPUT Output Voltage Output Voltage Temperature Coefficient (Notes 2, 3) Line Regulation Load Regulation Dropout Voltage (Note 5) Output Short-Circuit Current Long-Term Stability Thermal Hysteresis DYNAMIC CHARACTERISTICS Noise Voltage Ripple Rejection Turn-On Settling Time INPUT Supply Voltage Range Supply Current Change in Supply Current VIN IIN IIN/VIN VIN = 3.5V to 12.6V 3.5 12.6 7.25 1.5 V A A/V eOUT VOUT/VIN tR f = 0.1Hz to 10Hz f = 10Hz to 1kHz VIN = 3.5V 200mV, f = 120Hz To VOUT = 0.1% of final value 56 174 38 1 VP-P VRMS dB ms VOUT TCVOUT VOUT/VIN VOUT/IOUT VIN - VOUT ISC VOUT/time 1000 hours at +25C (Note 4) TA = +25C MAX6129A MAX6129B VIN = 3.5V to 12.6V IOUT = 0 to 4mA IOUT = 0 to -1mA IOUT = 0 IOUT = 4mA 25 150 140 30 0.1 2.4 MAX6129A (0.4%) MAX6129B (1%) 3.2868 3.2670 3.3000 3.3000 3.3132 3.3330 40 100 270 0.6 7 100 200 V ppm/C V/V V/A mV mA ppm ppm SYMBOL CONDITIONS MIN TYP MAX UNITS MAX6129 _______________________________________________________________________________________ 5 Ultra-Low-Power Series Voltage Reference MAX6129 ELECTRICAL CHARACTERISTICS--MAX6129_41 (VOUT = 4.096V) (VIN = 4.3V, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER OUTPUT Output Voltage Output Voltage Temperature Coefficient (Notes 2, 3) Line Regulation Load Regulation Dropout Voltage (Note 5) Output Short-Circuit Current Long-Term Stability Thermal Hysteresis DYNAMIC CHARACTERISTICS Noise Voltage Ripple Rejection Turn-On Settling Time INPUT Supply Voltage Range Supply Current Change in Supply Current VIN IIN IIN/VIN VIN = 4.3V to 12.6V 4.3 12.6 8.75 1.5 V A A/V eOUT VOUT/VIN tR f = 0.1Hz to 10Hz f = 10Hz to 1kHz VIN = 4.3V 200mV, f = 120Hz To VOUT = 0.1% of final value 72 210 36 1.2 VP-P VRMS dB ms VOUT TCVOUT VOUT/VIN VOUT/IOUT VIN - VOUT ISC VOUT/time 1000 hours at +25C (Note 4) TA = +25C MAX6129A MAX6129B VIN = 4.3V to 12.6V IOUT = 0 to 4mA IOUT = 0 to -1mA IOUT = 0 IOUT = 4mA 25 150 140 30 0.1 2.5 MAX6129A (0.4%) MAX6129B (1%) 4.0796 4.0550 4.0960 4.0960 4.1124 4.1370 40 100 310 0.6 8.5 100 200 V ppm/C V/V V/A mV mA ppm ppm SYMBOL CONDITIONS MIN TYP MAX UNITS 6 _______________________________________________________________________________________ Ultra-Low-Power Series Voltage Reference ELECTRICAL CHARACTERISTICS--MAX6129_50 (VOUT = 5.000V) (VIN = 5.2V, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER OUTPUT Output Voltage Output Voltage Temperature Coefficient (Notes 2, 3) Line Regulation Load Regulation Dropout Voltage (Note 5) Output Short-Circuit Current Long-Term Stability Thermal Hysteresis DYNAMIC CHARACTERISTICS Noise Voltage Ripple Rejection Turn-On Settling Time INPUT Supply Voltage Range Supply Current Change in Supply Current VIN IIN IIN/VIN VIN = 5.2V to 12.6V 5.2 12.6 10.5 1.5 V A A/V eOUT f = 0.1Hz to 10Hz f = 10Hz to 1kHz To VOUT = 0.1% of final value 90 245 38 1.4 VP-P VRMS dB ms VOUT TCVOUT TA = +25C MAX6129A MAX6129B 34 0.3 3.3 IOUT = 0 to 4mA IOUT = 0 to -1mA IOUT = 0 IOUT = 4mA 25 150 140 (Note 4) MAX6129A (0.4%) MAX6129B (1%) 4.9800 4.9500 5.0000 5.0000 5.0200 5.0500 40 100 375 0.8 9 100 200 V ppm/C V/V V/A mV mA ppm ppm SYMBOL CONDITIONS MIN TYP MAX UNITS MAX6129 VOUT/VIN VIN = 5.2V to 12.6V VOUT/ IOUT VIN - VOUT ISC VOUT/time 1000 hours at +25C VOUT/VIN VIN = 5.2V 200mV, f = 120Hz tR Note 1: Note 2: Note 3: Note 4: MAX6129 is 100% production tested at TA = +25C and is guaranteed by design for TA = TMIN to TMAX as specified. Temperature coefficient is defined by box method: (VMAX - VMIN)/(T V+25C). Not production tested. Guaranteed by design. 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. Note 5: Dropout voltage is the minimum input voltage at which VOUT changes by 0.1% from VOUT at rated VIN and is guaranteed by Load Regulation Test. _______________________________________________________________________________________ 7 Ultra-Low-Power Series Voltage Reference MAX6129 Typical Operating Characteristics (VIN = 2.5V for MAX_EUK21, VIN = 3.2V for MAX_EUK30, and VIN = 5.2V for MAX_EUK50, IOUT = 0, TA = +25C, unless otherwise noted.) OUTPUT VOLTAGE vs. TEMPERATURE (VOUT = 2.048V) MAX6129 toc01 OUTPUT VOLTAGE vs. TEMPERATURE (VOUT = 3V) MAX6129 toc02 OUTPUT VOLTAGE vs. TEMPERATURE (VOUT = 5V) 3 TYPICAL UNITS 5.004 5.002 OUTPUT VOLTAGE (V) 5.000 4.998 4.996 4.994 4.992 MAX6129 toc03 2.050 3 TYPICAL UNITS 3.003 3.001 OUTPUT VOLTAGE (V) 2.999 2.997 2.995 2.993 3 TYPICAL UNITS 5.006 2.048 OUTPUT VOLTAGE (V) 2.046 2.044 2.042 4.990 2.040 -40 -15 10 35 60 85 TEMPERATURE (C) 2.991 -40 -15 10 35 60 85 TEMPERATURE (C) 4.988 -40 -15 10 35 60 85 TEMPERATURE (C) SUPPLY CURRENT vs. INPUT VOLTAGE MAX6129 toc04 SUPPLY CURRENT vs. TEMPERATURE 6.5 SUPPLY CURRENT (A) 6.0 5.5 5.0 4.5 4.0 3.5 VOUT = 2.048V VOUT = 3V VOUT = 5V MAX6129 toc05 DROPOUT VOLTAGE vs. SOURCE CURRENT (VOUT = 2.048V) 0.14 DROPOUT VOLTAGE (V) 0.12 0.10 0.08 0.06 0.04 0.02 0 0 1 2 3 4 5 6 7 MAX6129 toc06 14 12 SUPPLY CURRENT (A) 10 8 6 4 2 0 VOUT = 5V VOUT = 3V VOUT = 2.048V 7.0 0.16 3.0 2.5 -40 -15 10 35 60 85 0 1 2 3 4 5 6 7 8 9 10 11 12 13 INPUT VOLTAGE (V) TEMPERATURE (C) SOURCE CURRENT (mA) DROPOUT VOLTAGE vs. SOURCE CURRENT (VOUT = 3V) MAX6129 toc07 DROPOUT VOLTAGE vs. SOURCE CURRENT (VOUT = 5V) MAX6129 toc08 LOAD REGULATION (VOUT = 2.048V) 2.0515 2.0510 OUTPUT VOLTAGE (V) 2.0505 2.0500 2.0495 2.0490 2.0485 2.0480 2.0475 2.0470 MAX6129 toc09 0.11 0.10 0.09 DROPOUT VOLTAGE (V) 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 0 1 2 3 4 5 6 7 SOURCE CURRENT (mA) 0.09 0.08 DROPOUT VOLTAGE (V) 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 0 1 2 3 4 5 6 7 SOURCE CURRENT (mA) 2.0520 -2 -1 0 1 2 3 4 5 6 7 OUTPUT CURRENT (mA) 8 _______________________________________________________________________________________ Ultra-Low-Power Series Voltage Reference Typical Operating Characteristics (continued) (VIN = 2.5V for MAX_EUK21, VIN = 3.2V for MAX_EUK30, and VIN = 5.2V for MAX_EUK50, IOUT = 0, TA = +25C, unless otherwise noted.) LINE REGULATION (VOUT = 2.048V) MAX6129 toc10 MAX6129 LOAD REGULATION (VOUT = 3V) 3.0050 3.0045 OUTPUT VOLTAGE (V) 3.0040 3.0035 3.0030 3.0025 3.0020 3.0015 3.0010 3.00155 -2 -1 0 1 2 3 4 5 6 7 3 4 5 MAX6129 toc11 LINE REGULATION (VOUT = 3V) MAX6129 toc12 2.04792 2.04790 2.04788 OUTPUT VOLTAGE (V) 2.04786 2.04784 2.04782 2.04780 2.04778 2.04776 2.04774 2.04772 2.5 4.0 5.5 7.0 8.5 10.0 11.5 3.0055 3.00180 3.00175 OUTPUT VOLTAGE (V) 3.00170 3.00165 3.00160 13.0 6 7 8 9 10 11 12 13 INPUT VOLTAGE (V) OUTPUT CURRENT (mA) INPUT VOLTAGE (V) LOAD REGULATION (VOUT = 5V) MAX6129 toc13 LINE REGULATION (VOUT = 5V) MAX6129 toc14 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (VOUT = 2.048V) MAX6129 toc15 5.0050 5.0045 5.0040 OUTPUT VOLTAGE (V) 5.0035 5.0030 5.0025 5.0020 5.0015 5.0010 5.0005 -2 -1 0 1 2 3 4 5 6 7 OUTPUT CURRENT (mA) 5.00080 5.00078 OUTPUT VOLTAGE (V) 5.00076 0 -10 -20 PSRR (dB) -30 -40 -50 -60 5.00074 5.00072 5.00070 5.00068 5.00066 5.00064 5 6 7 8 9 10 11 12 13 INPUT VOLTAGE (V) 0.1 1 10 FREQUENCY (kHz) 100 1000 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (VOUT = 3V) MAX6129 toc16 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (VOUT = 5V) MAX6129 toc17 LINE-TRANSIENT RESPONSE (VOUT = 2.048V) MAX6129 toc18 0 -10 -20 PSRR (dB) -30 -40 -50 -60 0.1 1 10 FREQUENCY (kHz) 100 0 -5 -10 -15 PSRR (dB) -20 -25 -30 -35 -40 -45 -50 3V VIN 200mV/div AC-COUPLED 2.5V 2.048V VOUT 200mV/div AC-COUPLED 200s/div 1000 0.1 1 10 FREQUENCY (kHz) 100 1000 _______________________________________________________________________________________ 9 Ultra-Low-Power Series Voltage Reference MAX6129 Typical Operating Characteristics (continued) (VIN = 2.5V for MAX_EUK21, VIN = 3.2V for MAX_EUK30, and VIN = 5.2V for MAX_EUK50, IOUT = 0, TA = +25C, unless otherwise noted.) LINE-TRANSIENT RESPONSE (VOUT = 3V) MAX6129 toc19 LINE-TRANSIENT RESPONSE (VOUT = 5V) MAX6129 toc20 3.7V VIN 200mV/div AC-COUPLED 5.7V VIN 200mV/div AC-COUPLED 3.2V 5.2V 5V 3V VOUT 200mV/div AC-COUPLED 200s/div 200s/div VOUT 100mV/div AC-COUPLED LOAD-TRANSIENT RESPONSE (SOURCING, VOUT = 2.048V) MAX6129 toc21 LOAD-TRANSIENT RESPONSE (SINKING, VOUT = 2.048V) MAX6129 toc22 COUT = 0 0 -1mA COUT = 0 IOUT 2mA/div 4mA 0 IOUT 10mA/div 2.048V VOUT 500mV/div AC-COUPLED 2.048V VOUT 500mV/div AC-COUPLED 100s/div 1ms/div LOAD-TRANSIENT RESPONSE (SOURCING, VOUT = 2.048V) MAX6129 toc23 LOAD-TRANSIENT RESPONSE (SINKING, VOUT = 2.048V) MAX6129 toc24 COUT = 1F 4mA 0 IOUT 10mA/div 0 -1mA COUT = 1F IOUT 2mA/div 2.048V VOUT 500mV/div AC-COUPLED 2.048V VOUT 500mV/div AC-COUPLED 400s/div 1ms/div 10 ______________________________________________________________________________________ Ultra-Low-Power Series Voltage Reference Typical Operating Characteristics (continued) (VIN = 2.5V for MAX_EUK21, VIN = 3.2V for MAX_EUK30, and VIN = 5.2V for MAX_EUK50, IOUT = 0, TA = +25C, unless otherwise noted.) LOAD-TRANSIENT RESPONSE (SOURCING, VOUT = 5V) MAX6129 toc25 MAX6129 LOAD-TRANSIENT RESPONSE (SINKING, VOUT = 5V) MAX6129 toc26 COUT = 0 4mA 0 IOUT 10mA/div 0 -1mA COUT = 0 IOUT 1mA/div 5V VOUT 500mV/div AC-COUPLED 5V VOUT 1V/div AC-COUPLED 400s/div 2ms/div LOAD-TRANSIENT RESPONSE (SOURCING, VOUT = 5V) MAX6129 toc27 LOAD-TRANSIENT RESPONSE (SINKING, VOUT = 5V) MAX6129 toc28 COUT = 1F 4mA 0 IOUT 10mA/div COUT = 1F 0 -1mA IOUT 1mA/div 6V VOUT 200mV/div AC-COUPLED 5V VOUT 1V/div AC-COUPLED 400s/div 2ms/div TURN-ON TRANSIENT (VOUT = 2.048V) MAX6129 toc29 TURN-ON TRANSIENT (VOUT = 3V) MAX6129 toc30 2.5V VIN 1V/div 3.2V VIN 2V/div 0 0 2.048V VOUT 1V/div 0 200s/div 200s/div 3V VOUT 1V/div 0 ______________________________________________________________________________________ 11 Ultra-Low-Power Series Voltage Reference MAX6129 Typical Operating Characteristics (continued) (VIN = 2.5V for MAX_EUK21, VIN = 3.2V for MAX_EUK30, and VIN = 5.2V for MAX_EUK50, IOUT = 0, TA = +25C, unless otherwise noted.) TURN-ON TRANSIENT (VOUT = 5V) MAX6129 toc31 0.1Hz TO 10Hz OUTPUT NOISE (VOUT = 2.048V) MAX6129 toc32 0.1Hz TO 10Hz OUTPUT NOISE (VOUT = 3V) MAX6129 toc33 5.2V VIN 2V/div VOUT 10V/div VOUT 2V/div 0 VOUT 10V/div 0 5V 400s/div 1s/div 1s/div 0.1Hz TO 10Hz OUTPUT NOISE (VOUT = 5V) MAX6129 toc34 NOISE vs. FREQUENCY (VOUT = 2.048V) MAX6129 toc35 NOISE vs. FREQUENCY (VOUT = 3V) 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 10 20 30 40 FREQUENCY (kHz) MAX6129 toc36 4.0 3.5 NOISE (VRMS/Hz) 3.0 2.5 2.0 1.5 1.0 0.5 0 VOUT 20V/div 1s/div 0 10 20 30 40 50 NOISE (VRMS/Hz) 50 FREQUENCY (kHz) NOISE vs. FREQUENCY (VOUT = 5V) 18 16 NOISE (VRMS/Hz) 14 12 10 8 6 4 2 0 0 10 20 30 40 50 FREQUENCY (kHz) MAX6129 toc37 20 12 ______________________________________________________________________________________ Ultra-Low-Power Series Voltage Reference Pin Description PIN 1 2 3, 4 5 NAME IN GND N.C. OUT Ground Internally connected. Leave unconnected or connect to ground. Reference Output FUNCTION Positive Voltage Supply Supply Current The quiescent supply current of the series-mode MAX6129 is very small, 5.25A (max), and is very stable against changes in the supply voltage with only 1.5A/V (max) variation with supply voltage. The MAX6129 family draws load current from the input voltage source only when required, so supply current is not wasted and efficiency is maximized at all input voltages. This improved efficiency reduces power dissipation and extends battery life. MAX6129 Applications Information Input Bypassing The MAX6129 does not require an input bypass capacitor. For improved transient performance, bypass the input to ground with a 0.1F ceramic capacitor. Place the capacitor as close to IN as possible. Output Thermal Hysteresis Output thermal hysteresis is the change of output voltage at T A = +25C before and after the device is cycled over its entire operating temperature range. Hysteresis is caused by differential package stress appearing across the device. Load Capacitance The MAX6129 does not require an output capacitor for stability. The MAX6129 is stable driving capacitive loads from 0 to 100pF and 0.1F to 10F when sourcing current and from 0 to 0.4F when sinking current. In applications where the load or the supply can experience step changes, an output capacitor reduces the amount of overshoot (undershoot) and improves the circuit's transient response. Many applications do not require an external capacitor, and the MAX6129 offers a significant advantage in applications where board space is critical. Temperature Coefficient vs. Operating Temperature Range for a 1LSB 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 1LSB, 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. 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 1LSB Maximum Error ______________________________________________________________________________________ 13 Ultra-Low-Power Series Voltage Reference MAX6129 VIN VCC MAX681 GND VMAX6129 GND 2VIN V+ IN OUT 1M V+ -REF OUTPUT +REF OUTPUT -2VIN 1M 10nF MAX480 V- Figure 2. Positive and Negative References from a Single 3V/5V Supply Selector Guide PART MAX6129AEUK21 MAX6129BEUK21 MAX6129AEUK25* MAX6129BEUK25 MAX6129AEUK30 MAX6129BEUK30 MAX6129AEUK33 MAX6129BEUK33 MAX6129AEUK41 MAX6129BEUK41 MAX6129AEUK50 MAX6129BEUK50 OUTPUT VOLTAGE (V) 2.048 2.048 2.500 2.500 3.000 3.000 3.300 3.300 4.096 4.096 5.000 5.000 INITIAL ACCURACY (%) 0.4 1 0.4 1 0.4 1 0.4 1 0.4 1 0.4 1 TEMPERATURE COEFFICIENT (ppm/C) 40 100 40 100 40 100 40 100 40 100 40 100 TOP MARK ADRM ADRN ADRO ADRP ADRQ ADRR ADRW ADRX ADRS ADRT ADRU ADRV *Future product--contact factory for availability. 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 voltage reference changes. Positive and Negative Low-Power Voltage Reference Figure 2 shows a typical method for developing a bipolar reference. The circuit uses a MAX681 voltage doubler/inverter charge-pump converter to power a MAX480, creating a positive as well as a negative reference voltage. Turn-On Time These devices typically turn on and settle to within 0.1% of their final value in less than 1.4ms. The turn-on time increases when heavily loaded and operating close to dropout. Chip Information TRANSISTOR COUNT: 30 PROCESS: BiCMOS 14 ______________________________________________________________________________________ Ultra-Low-Power Series 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.) SOT5L.EPS MAX6129 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) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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