9-2266; Rev 2; 6/3 3ppm/ C, Low-Power, Low-Dropout General Description The high-precision, low-power, low-dropout voltage reference features a low 3ppm/ C (max) temperature coefficient and a low dropout voltage (2m, max). This series-mode device features bandgap technology for low-noise performance and excellent accuracy. Load regulation specifications are guaranteed for source currents up to 5mA. The laser-trimmed, highstability thin-film resistors, together with post-package trimming, guarantee an excellent initial accuracy specification (.4%, max). The is a series voltage reference and consumes only 4µA of supply current (virtually independent of supply voltage). Series-mode references save system power and use minimal external components compared to 2-terminal shunt references. The is available in 8-pin µmax and SO packages. The unique blend of tiny packaging and excellent precision performance make these parts ideally suited for portable and communication applications. Applications Precision Regulators A/D and D/A Converters Power Supplies High-Accuracy Industrial and Process Control Hand-Held Instruments Features Low Temperature Coefficient 3ppm/ C (max), SO 5ppm/ C (max), µmax Tiny 5mm 3mm µmax Package Low 2m (max) Dropout oltage Low 4µA Quiescent ±.4% (max) Initial Accuracy Low 6µP-P Noise (.Hz to Hz) (2.5 Output) 5mA Output Source- Capability Wide 2.7 to 2.6 Supply oltage Excellent Line (3µ/, max) and Load (.5m/mA, max) Regulation SUFFIX Selector Guide OLTAGE OUTPUT 25 2.5 3 3. 4 4.96 5 5. Ordering Information PART TEMP RANGE PIN-PACKAGE MAXIMUM INITIAL ACCURACY (%) MAXIMUM TEMPCO (ppm/ C, -4 C to +85 C) A -4 C to +25 C 8 µmax.6 5 AASA -4 C to +25 C 8 SO.4 3 BASA -4 C to +25 C 8 SO.8 5 Note: Two-number part suffix indicates output voltage option. Typical Operating Circuit Pin Configuration SUPPLY INPUT TOP IEW.µF* IN OUT REFERENCE OUTPUT.µF N.C. IN N.C. 2 3 8 7 6 I.C.* N.C. OUT GND GND 4 5 I.C.* SO/µMAX *INPUT CAPACITORS ARE OPTIONAL. *INTERNALLY CONNECTED, DO NOT CONNECT. Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at -888-629-4642, or visit Maxim s website at www.maxim-ic.com.
ABSOLUTE MAXIMUM RATINGS oltage (with Respect to GND) IN...-.3 to +3 OUT...-.3 to +6 or ( IN +.3) OUT Short Circuit to IN or GND Duration...6s Continuous Power Dissipation (T A = +7 C) 8-Pin µmax (derate 5.5mW/ C above +7 C)...362mW 8-Pin SO (derate 5.88mW/ C above +7 C)...47mW Operating Temperature Range...-4 C to +25 C Storage Temperature Range...-65 C to +5 C Junction Temperature...+5 C Lead Temperature (soldering, s)...+3 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 _25 (OUT = 2.5) ( IN = 5, C LOAD =.µf, I OUT =, T A = T MIN to T MAX. Typical values are at, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Accuracy Temperature Coefficient (Note ) TC A grade SO B grade SO µmax A grade SO 2.499 2.5 2.5 B grade SO 2.498 2.5 2.52 µmax 2.4985 2.5 2.55 A grade SO -.4 +.4 B grade SO -.8 +.8 µmax -.6 +.6 T A = -4 C to +85 C 3 T A = -4 C to +25 C 4 7 T A = -4 C to +85 C 3 5 T A = -4 C to +25 C 5 T A = -4 C to +85 C 5 T A = -4 C to +25 C 2 7 Input oltage Range IN Inferred from line regulation 2.7 2.6 Line Regulation / IN 2.7 IN 2.6 2 3 µ/ % ppm/ C Load Regulation / I OUT -µa I OUT 5mA.3.5 m/ma Dropout oltage (Note 2) Quiescent Supply Output Short-Circuit =.%, I OUT = ma.2.2 DO =.%, I OUT = ma.2.4 4 6 I IN T A = -4 C to +25 C 85 Short to GND: = 9 I SC Short to IN : = IN -2.Hz f Hz 6 µ P-P Noise e n Hz f khz 2 µ RMS Turn-On Settling Time t ON settles to ±.% of final value 5 µs Thermal Hysteresis (Note 3) Long-Term Stability t = hours SO 4 µmax 45 µa ma 2 ppm ppm 2
ELECTRICAL CHARACTERISTICS _3 (OUT = 3.) ( IN = 5, C LOAD =.µf, I OUT =, T A = T MIN to T MAX. Typical values are at, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Accuracy Temperature Coefficient (Note ) TC A grade SO B grade SO µmax A grade SO 2.9988 3. 3.2 B grade SO 2.9976 3. 3.24 µmax 2.9982 3. 3.8 A grade SO -.4 +.4 B grade SO -.8 +.8 µmax -.6 +.6 T A = -4 C to +85 C 3 T A = -4 C to +25 C 4 7 T A = -4 C to +85 C 3 5 T A = -4 C to +25 C 5 T A = -4 C to +85 C 5 T A = -4 C to +25 C 2 7 Input oltage Range IN Inferred from line regulation 3.2 2.6 Line Regulation / IN 3.2 IN 2.6 2 3 µ/ % ppm/ C Load Regulation / I OUT -µa I OUT 5mA.3.6 m/ma Dropout oltage (Note 2) Quiescent Supply Output Short-Circuit =.%, I OUT = ma..2 DO =.%, I OUT = ma.2.4 4 6 I IN T A = -4 C to +25 C 85 Short to GND: = 9 I SC Short to IN : = IN -2 µa ma.hz f Hz 24 µ P-P Noise e n Hz f khz 5 µ RMS Turn-On Settling Time t ON settles to ±.% of final value 6 µs Thermal Hysteresis (Note 3) Long-Term Stability t = hours SO 4 µmax 45 2 ppm ppm 3
ELECTRICAL CHARACTERISTICS _4 (OUT = 4.96) ( IN = 5, C LOAD =.µf, I OUT =, T A = T MIN to T MAX. Typical values are at, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Accuracy Temperature Coefficient (Note ) TC A grade SO B grade SO µmax A grade SO 4.943 4.96 4.977 B grade SO 4.927 4.96 4.993 µmax 4.935 4.96 4.985 A grade SO -.4 +.4 B grade SO -.8 +.8 µmax -.6 +.6 T A = -4 C to +85 C 3 T A = -4 C to +25 C 4 7 T A = -4 C to +85 C 3 5 T A = -4 C to +25 C 5 T A = -4 C to +85 C 5 T A = -4 C to +25 C 2 7 Input oltage Range IN Inferred from line regulation 4.2 2.6 Line Regulation / IN 4.2 IN 2.6 2 4 µ/ % ppm/ C Load Regulation / I OUT -µa I OUT 5mA.3.8 m/ma Dropout oltage (Note 2) Quiescent Supply Output Short-Circuit =.%, I OUT = ma..2 DO =.%, I OUT = ma.2.4 45 65 I IN T A = -4 C to +25 C 85 Short to GND: = 9 I SC Short to IN : = IN -2 µa ma.hz f Hz 32 µ P-P Noise e n Hz f khz 22 µ RMS Turn-On Settling Time t ON settles to ±.% of final value 8 µs Thermal Hysteresis (Note 3) Long-Term Stability t = hours SO 4 µmax 45 2 ppm ppm 4
ELECTRICAL CHARACTERISTICS _5 (OUT = 5.) ( IN = 5.5, C LOAD =.µf, I OUT =, T A = T MIN to T MAX. Typical values are at, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Accuracy Temperature Coefficient (Note ) TC A grade SO B grade SO µmax A grade SO 4.998 5. 5.2 B grade SO 4.996 5. 5.4 µmax 4.997 5. 5.3 A grade SO -.4 +.4 B grade SO -.8 +.8 µmax -.6 +.6 T A = -4 C to +85 C 3 T A = -4 C to +25 C 4 7 T A = -4 C to +85 C 3 5 T A = -4 C to +25 C 5 T A = -4 C to +85 C 5 T A = -4 C to +25 C 2 7 Input oltage Range IN Inferred from line regulation 5.2 2.6 Line Regulation / IN 5.2 IN 2.6 2 5 µ/ % ppm/ C Load Regulation / I OUT -µa I OUT 5mA.. m/ma Dropout oltage (Note 2) Quiescent Supply Output Short-Circuit =.%, I OUT = ma.2.2 DO =.%, I OUT = ma.2.4 4 6 I IN T A = -4 C to +25 C 85 Short to GND: = 9 I SC Short to IN : = IN -2 µa ma.hz f Hz 4 µ P-P Noise e n Hz f khz 26 µ RMS Turn-On Settling Time t ON settles to ±.% of final value µs Thermal Hysteresis (Note 3) Long-Term Stability t = hours SO 4 µmax 45 2 ppm Note : The is % drift-tested for T A = T MIN to T MAX, as specified. Note 2: Dropout oltage is the minimum voltage at which changes.% from at IN = 5 ( IN = 5.5 for = 5). Note 3: Thermal Hysteresis is defined as the change in the initial +25 C output voltage after cycling the device from T MAX to T MIN. ppm 5
( IN = 5, I OUT =,, unless otherwise noted.) (Note 4) OUTPUT OLTAGE () 2.5 2.58 2.56 2.54 2.52 2.5 2.4998 2.4996 2.4994 OUTPUT OLTAGE vs. TEMPERATURE 3 TYPICAL UNITS 2.4992-4 -25-5 2 35 5 65 8 95 25 TEMPERATURE ( C) toc OUTPUT OLTAGE () 5. 5.5 5. 4.9995 4.999 4.9985 OUTPUT OLTAGE vs. TEMPERATURE ( = 5) 3 TYPICAL UNITS IN = 5.5 4.998-4 -25-5 2 35 5 65 8 95 25 TEMPERATURE ( C) Typical Operating Characteristics toc2 OUTPUT OLTAGE () 2.54 2.535 2.53 2.525 2.52 2.55 2.5 2.55 2.5 2.4995 2.499 2 LOAD REGULATION T A = +85 C T A = -4 C 4 6 8 2 4 6 8 OUTPUT CURRENT (ma) 2 toc3 OUTPUT OLTAGE () PSRR (db) 5.2 5.5 5. 5.5 5. 4.9995 4.999 4.9985-2 -4-6 -8 - T A = -4 C LOAD REGULATION ( = 5) T A = +85 C IN = 5.5 4.998 2 4 6 8 2 4 6 8 2 OUTPUT CURRENT (ma) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY -2.... FREQUENCY (khz) toc7 toc4 DROPOUT OLTAGE (m) PSRR (db) 7 6 5 4 3 2-2 -4-6 -8 - DROPOUT OLTAGE vs. OUTPUT CURRENT 2 4 6 8 2 4 6 8 2 OUTPUT CURRENT (ma) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY ( = 5) IN = 5.5 T A = +85 C T A = -4 C -2.... FREQUENCY (khz) toc5 toc8 DROPOUT OLTAGE (m) SUPPLY CURRENT (µa) 6 55 5 45 4 35 3 25 2 5 5 5 35 2 5 9 75 6 45 3 5 DROPOUT OLTAGE vs. OUTPUT CURRENT ( = 5) IN = 5.5 T A = +85 C 2 4 6 8 2 4 6 8 2 OUTPUT CURRENT (ma) SUPPLY CURRENT vs. INPUT OLTAGE T A = +85 C T A = -4 C T A = -4 C 2 3 4 5 6 7 8 9 2 3 INPUT OLTAGE () toc6 toc9 6
Typical Operating Characteristics (continued) ( IN = 5, I OUT =,, unless otherwise noted.) (Note 4) SUPPLY CURRENT (µa) 22 2 8 6 4 2 8 6 4 SUPPLY CURRENT vs. INPUT OLTAGE ( = 5) T A = +85 C IN = 5.5 2 T A = -4 C 2 3 4 5 6 7 8 9 2 3 INPUT OLTAGE () toc.hz TO Hz OUTPUT NOISE toc s/div 4µ/div.Hz TO Hz OUTPUT NOISE ( = 5) toc2 IN = 5.5 C OUT =.µf LOAD TRANSIENT toc3 2.5 5m/div µ/div s/div ma ma 4µs/div I OUT ma/div C OUT =.µf LOAD TRANSIENT toc4 C OUT = µf LOAD TRANSIENT toc5 2.5 5m/div ma 2.5 5m/div -µa I OUT ma/div ma ma I OUT ma/div ms/div 4µs/div 7
Typical Operating Characteristics (continued) ( IN = 5, I OUT =,, unless otherwise noted.) (Note 4) 2.5 C OUT = µf LOAD TRANSIENT toc6 2m/div 5.5 4.5 C OUT =.µf LINE TRANSIENT toc7 IN 5m/div ma -µa I OUT ma/div 2.5 m/div ms/div 4µs/div 6.5 5.5 LINE TRANSIENT ( = 5) toc8 C OUT =.µf IN = 5.5 IN 5m/div 5 TURN-ON TRANSIENT toc9 IN 2/div 2.5 /div 5 m/div C OUT =.µf ms/div µs/div TURN-ON TRANSIENT ( = 5) toc2 TURN-ON TRANSIENT toc2 5.5 IN 2/div 5 IN 2/div 5 2/div 2.5 /div IN = 5.5 C OUT =.µf C OUT = µf 4µs/div 2ms/div 8
Typical Operating Characteristics (continued) ( IN = 5, I OUT =,, unless otherwise noted.) (Note 4) 5.5 5 TURN-ON TRANSIENT ( = 5) toc22 IN 2/div 2/div OUT () 2.58 2.57 2.56 2.55 2.54 2.53 LONG-TERM STABILITY vs. TIME 2 TYPICAL UNITS SO PACKAGE toc23 OUT () 2.5 2.58 2.56 2.54 2.52 2.5 2.4998 LONG-TERM STABILITY vs. TIME 2 TYPICAL UNITS µmax PACKAGE toc24 2ms/div IN = 5.5 C OUT = µf 2.52 2.5 2 3 4 5 6 7 8 9 TIME (HOURS) 2.4996 2.4994 2 3 4 5 6 7 8 9 TIME (HOURS) OUT () 5.8 5.7 5.6 5.5 5.4 5.3 5.2 5. LONG-TERM STABILITY vs. TIME ( = 5.) 5. 4.9999 4.9998 2 TYPICAL UNITS 4.9997 SO PACKAGE 4.9996 2 3 4 5 6 7 8 9 TIME (HOURS) toc25 OUT () 5.4 5.2 5. 5.8 5.6 5.4 LONG-TERM STABILITY vs. TIME ( = 5.) 5.2 2 TYPICAL UNITS µmax PACKAGE 5. 2 3 4 5 6 7 8 9 TIME (HOURS) toc26 Note 4: Many of the Typical Operating Characteristics are extremely similar. The extremes of these characteristics are found in the (2.5 output) and the (5 output). The Typical Operating Characteristics of the remainder of the family typically lie between these two extremes and can be estimated based on their output voltages. 9
Pin Description PIN NAME FUNCTION, 3, 7 N.C. No Connection. Not connected internally. Leave unconnected or connect to GND. 2 IN Positive Power-Supply Input 4 GND Ground 5, 8 I.C. Internally Connected. Do not connect externally. 6 OUT Reference. Connect a.µf minimum capacitor to GND. Applications Information Bypassing/Load Capacitance For the best line-transient performance, decouple the input with a.µf 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 family requires a minimum output capacitance of.µf for stability and is stable with capacitive loads (including the bypass capacitance) of up to µf. In applications where the load or the 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 device as possible. Supply The quiescent supply current of the series reference is typically 4µA and is virtually independent of the supply voltage. In the family, the load current is drawn from the input 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. When the supply voltage is below the minimum-specified input voltage (as during turn-on), the devices can draw up to 5µA beyond the nominal supply current. The input voltage source must be capable of providing this current to ensure reliable turn-on. Thermal Hysteresis Thermal hysteresis is the change in the output voltage at 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 2ppm for both SO and µmax packages. Turn-On Time These devices typically turn on and settle to within.% of their final value in <ms. The turn-on time can increase up to 2ms with the device operating at the minimum dropout voltage and the maximum load. Low-Power, 4-Bit DAC with as a Reference Figure shows a typical application circuit for the providing both the power supply and precision reference voltage for a 4-bit high-resolution, serialinput, voltage-output digital-to-analog converter. The with a 2.5 output provides the reference voltage for the DAC. IN OUT GND 3 SUPPLY 2.5 DD MAX543 REF GND ANALOG OUTPUT Figure. 4-Bit High-Resolution DAC and Positive Reference From a Single 3 Supply
Negative Low-Power As shown in Figure 2, the can be used to develop a negative voltage reference using the MAX4, a rail-to-rail op-amp with low power, low noise, and low offset. The circuit only provides a good negative reference and is ideal for space- and costsensitive applications since it does not use resistors..µf +.µf POSITIE SUPPLY IN OUT GND.µF Temperature Coefficient vs. Operating Temperature Range for a LSB Maximum Error In a data converter application, the converter s reference voltage 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 3 shows the maximum allowable reference-voltage temperature coefficient that keeps the conversion error to less than LSB. This is a function of the operating temperature range (T MAX - T MIN ) 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 voltage reference changes..µf MAX4 - - TRANSISTOR COUNT: 656 PROCESS: BiCMOS Chip Information Figure 2. Negative Low-Power, TEMPERATURE COEFFICIENT (ppm/ C) 8 BIT BIT 2 BIT 4 BIT. 6 BIT 8 BIT. 2 BIT OPERATING TEMPERATURE RANGE (T MAX - T MIN ) ( C) Figure 3. Temperature Coefficient vs. Operating Temperature Range for a LSB Maximum Error
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.) N E H INCHES MILLIMETERS DIM A A MIN.53.4 MAX.69. MIN.35. MAX.75.25 B.4.9.35.49 C.7..9.25 e.5 BSC.27 BSC E.5.57 3.8 4. H.228.244 5.8 6.2 L.6.5.4.27 SOICN.EPS TOP IEW ARIATIONS: DIM D D D INCHES MILLIMETERS MIN MAX MIN MAX N MS2.89.97 4.8 5. 8 AA.337.344 8.55 8.75 4 AB.386.394 9.8. 6 AC D A C e B A FRONT IEW L SIDE IEW -8 PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE,.5" SOIC APPROAL DOCUMENT CONTROL NO. RE. 2-4 B 2
Package Information (continued) (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.).6±..6±. 8 ÿ.5±. D TOP IEW E H 4X S BOTTOM IEW 8 DIM A A MIN MAX -.43.2.6.37..4.5.7.6.2.256 BSC A2.3 b c D e E H L α S INCHES.6.88.6.2.98.26 6.27 BSC MILLIMETERS MIN MAX -..5.5.75.95.25.36.3.8 2.95 3.5.65 BSC 2.95 3.5 4.78 5.3.4.66 6.525 BSC 8LUMAXD.EPS A2 A A e b c L α FRONT IEW SIDE IEW PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, 8L umax/usop APPROAL DOCUMENT CONTROL NO. RE. 2-36 J 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, 2 San Gabriel Drive, Sunnyvale, CA 9486 48-737-76 3 23 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.