Ultra-Low-Power Series Voltage Reference

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1 19-257; Rev 2; 3/5 Ultra-Low-Power Series Voltage Reference General Description The 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 7% 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 5.25µA (max) supply current, and a low 2mV dropout voltage make these devices ideal for battery-operated systems. An initial accuracy of.4% and a 4ppm/ C (max) temperature coefficient make the 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 1µF. The provides six output voltages of 2.48V, 2.5V, 3V, 3.3V, 4.96V, and 5V. The is available in a 5-pin SOT23 package and in die form. Battery-Powered Systems Handheld Instruments Precision Power Supplies A/D and D/A Converters Applications Typical Operating Circuit V IN = 2.5V TO 12.6V * Features Ultra-Low 5.25µA (max) Supply Current 4mA Output Source Current 1mA Output Sink Current ±.4% (max) Initial Accuracy 4ppm/ C (max) Temperature Coefficient 2.5V to 12.6V Supply Range Low 2mV Dropout Stable with Capacitive Loads Up to 1µF No External Capacitors Required Miniature 5-Pin SOT23 Package Ordering Information PA R T TEMP RANGE PIN - PA C K A G E O U TPU T VO LT A G E ( V) M AX 6129_E U K21- T -4 C to +85 C 5 SOT M AX 6129AC /D 21-4 C to +85 C Dice 2.48 M AX 6129_E U K25- T -4 C to +85 C 5 SOT M AX 6129AC /D 25-4 C to +85 C Dice 2.5 M AX 6129_E U K3- T -4 C to +85 C 5 SOT M AX 6129AC /D 3-4 C to +85 C Dice 3. M AX 6129_E U K33- T -4 C to +85 C 5 SOT M AX 6129AC /D 33-4 C to +85 C Dice 3.3 M AX 6129_E U K41- T -4 C to +85 C 5 SOT M AX 6129AC /D 41-4 C to +85 C Dice 4.96 M AX 6129_E U K5- T -4 C to +85 C 5 SOT M AX 6129AC /D 5-4 C to +7 C Dice 5. Note: The _EUK is available in A or B grade. 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. Pin Configuration TOP VIEW IN IN 1 5 OUT OUT GND 2 GND N.C. 3 4 N.C. *CAPACITOR IS OPTIONAL SOT23 Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at , or visit Maxim s website at

2 ABSOLUTE MAXIMUM RATINGS IN to GND...-.3V to +13V OUT to GND...-.3V to the lower of +6V and (V IN +.3V) Output to GND Short-Circuit Duration...Continuous Continuous Power Dissipation (T A = +7 C) 5-Pin SOT23 (derate 7.1mW/ C above +7 C)...571mW Operating Temperature Range...-4 C to +85 C Storage Temperature Range C to +15 C Lead Temperature (soldering, 1s)...+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 _21 (VOUT = 2.48V) (V IN = 2.5V, I OUT =, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +25 C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage T A = +25 C Output Voltage Temperature Coefficient (Notes 2, 3) A (±.4%) B (±1%) A 4 TC B 1 Line Regulation (Note 4) / V IN V IN = 2.5V to 12.6V 27 2 µv/v Load Regulation (Note 4) / I OUT = to 4mA.22.7 I OUT IOUT = to -1mA Output Short-Circuit Current I SC 6 ma Long-Term Stability /time 1 hours at +25 C 15 ppm Thermal Hysteresis (Note 5) 14 ppm DYNAMIC CHARACTERISTICS V ppm/ C f =.1Hz to 1Hz 3 µv P-P Noise Voltage e OUT f = 1Hz to 1kHz 115 µv RMS Ripple Rejection / V IN V IN = 2.5V ±2mV, f = 12Hz 43 db Turn-On Settling Time t R To =.1% of final value 45 µs INPUT Supply Voltage Range V IN V Supply Current I IN 5.25 µa Change in Supply Current (Note 4) µv/µa I IN /V IN V IN = 2.5V to 12.6V µa/v 2

3 ELECTRICAL CHARACTERISTICS _25 (VOUT = 2.5V) (V IN = 2.7V, I OUT =, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +25 C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage T A = +25 C Output Voltage Temperature Coefficient (Notes 2, 3) A (±.4%) B (±1%) A 4 TC B 1 Line Regulation (Note 4) / V IN V IN = 2.7V to 12.6V 3 23 µv/v I OUT = to 4mA.1.6 Load Regulation (Note 4) / I OUT IOUT = to -1mA V ppm/ C µv/µa I OUT =.3 1 Dropout Voltage (Notes 4, 6) V IN - I OUT = 4mA 14 2 mv Output Short-Circuit Current I SC 6 ma Long-Term Stability /time 1 hours at +25 C 15 ppm Thermal Hysteresis (Note 5) 14 ppm DYNAMIC CHARACTERISTICS f =.1Hz to 1Hz 39 µv P-P Noise Voltage e OUT f = 1Hz to 1kHz 137 µv RMS Ripple Rejection / V IN V IN = 2.7V ±2mV, f = 12Hz 34 db Turn-On Settling Time t R To =.1% of final value 7 ms INPUT Supply Voltage Range V IN V Supply Current I IN 5.75 µa Change in Supply Current (Note 4) I IN /V IN V IN = 2.7V to 12.6V µa/v 3

4 ELECTRICAL CHARACTERISTICS _3 (VOUT = 3.V) (V IN = 3.2V, I OUT =, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +25 C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage T A = +25 C Output Voltage Temperature Coefficient (Notes 2, 3) A (±.4%) B (±1%) A 4 TC B 1 Line Regulation (Note 4) / V IN V IN = 3.2V to 12.6V µv/v Load Regulation (Note 4) / I OUT = to 4mA.1.6 I OUT IOUT = to -1mA I OUT =.2 1 Dropout Voltage (Notes 4, 6) V IN - I OUT = 4mA 14 2 V ppm/ C µv/µa mv Output Short-Circuit Current I SC 25 ma Long-Term Stability /time 1 hours at +25 C 15 ppm Thermal Hysteresis (Note 5) 14 ppm DYNAMIC CHARACTERISTICS f =.1Hz to 1Hz 5 µv P-P Noise Voltage e OUT f = 1Hz to 1kHz 161 µv RMS Ripple Rejection / V IN V IN = 3.2V ±2mV, f = 12Hz 37 db Turn-On Settling Time t R To =.1% of final value 775 µs INPUT Supply Voltage Range V IN V Supply Current I IN 6.75 µa Change in Supply Current (Note 4) I IN /V IN V IN = 3.2V to 12.6V µa/v 4

5 ELECTRICAL CHARACTERISTICS _33 (VOUT = 3.3V) (V IN = 3.5V, I OUT =, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +25 C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage T A = +25 C Output Voltage Temperature Coefficient (Notes 2, 3) A (±.4%) B (±1%) A 4 TC B 1 Line Regulation (Note 4) / V IN V IN = 3.5V to 12.6V 3 27 µv/v I OUT = to 4mA.1.6 Load Regulation (Note 4) / I OUT IOUT = to -1mA V ppm/ C µv/µa I OUT =.2 1 Dropout Voltage (Notes 4, 6) V IN - I OUT = 4mA 14 2 mv Output Short-Circuit Current I SC 25 ma Long-Term Stability /time 1 hours at +25 C 15 ppm Thermal Hysteresis (Note 5) 14 ppm DYNAMIC CHARACTERISTICS f =.1Hz to 1Hz 56 µv P-P Noise Voltage e OUT f = 1Hz to 1kHz 174 µv RMS Ripple Rejection / V IN V IN = 3.5V ±2mV, f = 12Hz 38 db Turn-On Settling Time t R To =.1% of final value 1 ms INPUT Supply Voltage Range V IN V Supply Current I IN 7.25 µa Change in Supply Current (Note 4) I IN /V IN V IN = 3.5V to 12.6V µa/v 5

6 ELECTRICAL CHARACTERISTICS _41 (VOUT = 4.96V) (V IN = 4.3V, I OUT =, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +25 C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage T A = +25 C Output Voltage Temperature Coefficient (Notes 2, 3) A (±.4%) B (±1%) A 4 TC B 1 Line Regulation (Note 4) / V IN V IN = 4.3V to 12.6V 3 31 µv/v I OUT = to 4mA.1.6 Load Regulation (Note 4) / I OUT IOUT = to -1mA V ppm/ C µv/µa I OUT =.18 1 Dropout Voltage (Notes 4, 6) V IN - I OUT = 4mA 14 2 mv Output Short-Circuit Current I SC 25 ma Long-Term Stability /time 1 hours at +25 C 15 ppm Thermal Hysteresis (Note 5) 14 ppm DYNAMIC CHARACTERISTICS f =.1Hz to 1Hz 72 µv P-P Noise Voltage e OUT f = 1Hz to 1kHz 21 µv RMS Ripple Rejection / V IN V IN = 4.3V ±2mV, f = 12Hz 36 db Turn-On Settling Time t R To =.1% of final value 1.2 ms INPUT Supply Voltage Range V IN V Supply Current I IN 8.75 µa Change in Supply Current (Note 4) I IN /V IN V IN = 4.3V to 12.6V µa/v 6

7 ELECTRICAL CHARACTERISTICS _5 (VOUT = 5.V) (V IN = 5.2V, I OUT =, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +25 C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage T A = +25 C Output Voltage Temperature Coefficient (Notes 2, 3) A (±.4%) B (±1%) A 4 TC B 1 Line Regulation (Note 4) / V IN V IN = 5.2V to 12.6V µv/v Load Regulation (Note 4) / I OUT = to 4mA.3.8 I OUT IOUT = to -1mA I OUT = Dropout Voltage (Notes 4, 6) V IN - I OUT = 4mA 14 2 V ppm/ C µv/µa mv Output Short-Circuit Current I SC 25 ma Long-Term Stability /time 1 hours at +25 C 15 ppm Thermal Hysteresis (Note 5) 14 ppm DYNAMIC CHARACTERISTICS f =.1Hz to 1Hz 9 µv P-P Noise Voltage e OUT f = 1Hz to 1kHz 245 µv RMS Ripple Rejection / V IN V IN = 5.2V ±2mV, f = 12Hz 38 db Turn-On Settling Time t R To =.1% of final value 1.4 ms INPUT Supply Voltage Range V IN V Supply Current I IN 1.5 µa Change in Supply Current (Note 4) I IN /V IN V IN = 5.2V to 12.6V µa/v Note 1: is 1% production tested at T A = +25 C and is guaranteed by design for T A = T MIN to T MAX as specified. Note 2: Temperature coefficient is defined by box method: (V MAX - V MIN )/( T V +25 C ). Note 3: Not production tested. Guaranteed by design for both SOT23 and dice. Note 4: Only the typical values apply to A sold in die form (max values apply to packaged parts). Note 5: Thermal hysteresis is defined as the change in output voltage at T A = +25 C before and after cycling the device from T MAX to T MIN. Note 6: Dropout voltage is the minimum input voltage at which changes by.1% from at rated V IN and is guaranteed by Load Regulation Test. 7

8 Typical Operating Characteristics (V IN = 2.5V for MAX_EUK21, V IN = 3.2V for MAX_EUK3, and V IN = 5.2V for MAX_EUK5, I OUT =, T A = +25 C, unless otherwise noted.) VOLTAGE (V) VOLTAGE vs. TEMPERATURE ( = 2.48V) 3 TYPICAL UNITS toc1 VOLTAGE (V) VOLTAGE vs. TEMPERATURE ( = 3V) 3 TYPICAL UNITS toc2 VOLTAGE (V) VOLTAGE vs. TEMPERATURE ( = 5V) 3 TYPICAL UNITS toc TEMPERATURE ( C) TEMPERATURE ( C) TEMPERATURE ( C) SUPPLY CURRENT (µa) SUPPLY CURRENT vs. INPUT VOLTAGE = 3V = 2.48V = 5V toc4 SUPPLY CURRENT (µa) SUPPLY CURRENT vs. TEMPERATURE = 5V = 3V = 2.48V toc5 DROPOUT VOLTAGE (V) DROPOUT VOLTAGE vs. SOURCE CURRENT ( = 2.48V) toc INPUT VOLTAGE (V) TEMPERATURE ( C) SOURCE CURRENT (ma) DROPOUT VOLTAGE (V) DROPOUT VOLTAGE vs. SOURCE CURRENT ( = 3V) SOURCE CURRENT (ma) toc7 DROPOUT VOLTAGE (V) DROPOUT VOLTAGE vs. SOURCE CURRENT ( = 5V) SOURCE CURRENT (ma) toc8 VOLTAGE (V) LOAD REGULATION ( = 2.48V) CURRENT (ma) toc9 8

9 VOLTAGE (V) Typical Operating Characteristics (continued) (V IN = 2.5V for MAX_EUK21, V IN = 3.2V for MAX_EUK3, and V IN = 5.2V for MAX_EUK5, I OUT =, T A = +25 C, unless otherwise noted.) LINE REGULATION ( = 2.48V) INPUT VOLTAGE (V) toc1 VOLTAGE (V) LOAD REGULATION ( = 3V) CURRENT (ma) toc11 VOLTAGE (V) LINE REGULATION ( = 3V) INPUT VOLTAGE (V) toc12 VOLTAGE (V) LOAD REGULATION ( = 5V) toc13 VOLTAGE (V) LINE REGULATION ( = 5V) toc14 PSRR (db) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY ( = 2.48V) toc CURRENT (ma) INPUT VOLTAGE (V) FREQUENCY (khz) PSRR (db) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY ( = 3V) toc16 PSRR (db) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY ( = 5V) toc17 3V 2.5V 2.48V LINE-TRANSIENT RESPONSE ( = 2.48V) toc18 V IN 2mV/div 2mV/div FREQUENCY (khz) FREQUENCY (khz) 2µs/div 9

10 Typical Operating Characteristics (continued) (V IN = 2.5V for MAX_EUK21, V IN = 3.2V for MAX_EUK3, and V IN = 5.2V for MAX_EUK5, I OUT =, T A = +25 C, unless otherwise noted.) 3.7V LINE-TRANSIENT RESPONSE ( = 3V) toc19 V IN 2mV/div 5.7V LINE-TRANSIENT RESPONSE ( = 5V) toc2 V IN 2mV/div 3.2V 5.2V 3V 2mV/div 5V 1mV/div 2µs/div 2µs/div C OUT = LOAD-TRANSIENT RESPONSE (SOURCING, = 2.48V) toc21 C OUT = LOAD-TRANSIENT RESPONSE (SINKING, = 2.48V) toc22 4mA I OUT 1mA/div -1mA I OUT 2mA/div 2.48V 5mV/div 2.48V 5mV/div 1µs/div 1ms/div LOAD-TRANSIENT RESPONSE (SOURCING, = 2.48V) C OUT = 1µF toc23 LOAD-TRANSIENT RESPONSE (SINKING, = 2.48V) C OUT = 1µF toc24 4mA I OUT 1mA/div -1mA I OUT 2mA/div 2.48V 5mV/div 2.48V 5mV/div 4µs/div 1ms/div 1

11 Typical Operating Characteristics (continued) (V IN = 2.5V for MAX_EUK21, V IN = 3.2V for MAX_EUK3, and V IN = 5.2V for MAX_EUK5, I OUT =, T A = +25 C, unless otherwise noted.) 4mA C OUT = LOAD-TRANSIENT RESPONSE (SOURCING, = 5V) toc25 I OUT 1mA/div -1mA C OUT = LOAD-TRANSIENT RESPONSE (SINKING, = 5V) toc26 I OUT 1mA/div 5V 5mV/div 5V 1V/div 4µs/div 2ms/div LOAD-TRANSIENT RESPONSE (SOURCING, = 5V) C OUT = 1µF toc27 LOAD-TRANSIENT RESPONSE (SINKING, = 5V) C OUT = 1µF toc28 4mA I OUT 1mA/div -1mA I OUT 1mA/div 6V 2mV/div 5V 1V/div 4µs/div 2ms/div TURN-ON TRANSIENT ( = 2.48V) toc29 TURN-ON TRANSIENT ( = 3V) toc3 2.5V V IN 1V/div 3.2V V IN 2V/div 2.48V 1V/div 3V 1V/div 2µs/div 2µs/div 11

12 5.2V Typical Operating Characteristics (continued) (V IN = 2.5V for MAX_EUK21, V IN = 3.2V for MAX_EUK3, and V IN = 5.2V for MAX_EUK5, I OUT =, T A = +25 C, unless otherwise noted.) TURN-ON TRANSIENT ( = 5V) toc31 V IN 2V/div.1Hz TO 1Hz NOISE ( = 2.48V) toc32.1hz TO 1Hz NOISE ( = 3V) toc33 5V 1µV/div 1µV/div 2V/div 4µs/div 1s/div 1s/div.1Hz TO 1Hz NOISE ( = 5V) 1s/div toc34 2µV/div NOISE (µvrms/ Hz) NOISE vs. FREQUENCY ( = 2.48V) FREQUENCY (khz) toc35 NOISE (µvrms/ Hz) NOISE vs. FREQUENCY ( = 3V) FREQUENCY (khz) toc NOISE vs. FREQUENCY ( = 5V) toc37 NOISE (µvrms/ Hz) FREQUENCY (khz) 12

13 PIN NAME FUNCTION 1 IN Positive Voltage Supply 2 GND Ground Pin Description 3, 4 N.C. Internally connected. Leave unconnected or connect to ground. 5 OUT Reference Output Applications Information Input Bypassing The does not require an input bypass capacitor. For improved transient performance, bypass the input to ground with a.1µf ceramic capacitor. Place the capacitor as close to IN as possible. Load Capacitance The does not require an output capacitor for stability. The is stable driving capacitive loads from to 1pF and.1µf to 1µF when sourcing current and from to.4µf 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 offers a significant advantage in applications where board space is critical. Supply Current The quiescent supply current of the series-mode is very small, 5.25µA (max), and is very stable against changes in the supply voltage with only 1.5µA/V (max) variation with supply voltage. The 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. Output Thermal Hysteresis Output thermal hysteresis is the change of output voltage at T A = +25 C before and after the device is cycled over its entire operating temperature range. Hysteresis is caused by differential package stress appearing across the device. 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 (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. 1, 1 TEMPERATURE COEFFICIENT (ppm/ C) 1 8 BIT 1 1 BIT 12 BIT 1 14 BIT.1 16 BIT 18 BIT.1 2 BIT OPERATING TEMPERATURE RANGE (T MAX - T MIN ) ( C) Figure 1. Temperature Coefficient vs. Operating Temperature Range for a 1LSB Maximum Error 13

14 V IN V CC MAX681 GND V+ V- 2V IN IN GND OUT 1MΩ +REF V+ -2V IN 1MΩ 1nF MAX48 -REF V- Figure 2. Positive and Negative References from a Single 3V/5V Supply 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. Turn-On Time These devices typically turn on and settle to within.1% of their final value in less than 1.4ms. The turn-on time increases when heavily loaded and operating close to dropout. 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 MAX48, creating a positive as well as a negative reference voltage. 14

15 PART PIN-PACKAGE VOLTAGE (V) INITIAL ACCURACY (%) TEMPERATURE COEFFICIENT (ppm/ C) Selector Guide TOP MARK AEUK21-T 5 SOT ADRM AC/D21 Dice BEUK21-T 5 SOT ADRN AEUK25-T 5 SOT ADRO AC/D25 Dice BEUK25-T* 5 SOT ADRP AEUK3-T 5 SOT ADRQ AC/D3 Dice BEUK3-T 5 SOT ADRR AEUK33-T 5 SOT ADRW AC/D33 Dice BEUK33-T 5 SOT ADRX AEUK41-T 5 SOT ADRS AC/D41 Dice BEUK41-T 5 SOT ADRT AEUK5-T 5 SOT ADRU AC/D5 Dice BEUK5-T 5 SOT ADRV *Future product contact factory for availability. N.C. N.C. Chip Topography OUT N.C. TRANSISTOR COUNT: 3 PROCESS: BiCMOS SUBSTRATE CONNECTED TO GND Chip Information GND N.C. N.C. IN 15

16 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 SOT-23 5L.EPS PACKAGE OUTLINE, SOT-23, 5L E 1 1 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. 16 Maxim Integrated Products, 12 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

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