Precision, Micropower, 1.8V Supply, Low-Dropout, SOT23 Voltage Reference

Transcription

1 ; Rev 2; 12/2 Precision, Micropower, 1.8V Supply, General Description The is a precision, low-voltage, low-dropout, micropower voltage reference in a SOT23 package. This three-terminal reference operates with an input voltage from ( + 2mV) to 5.5V, and is available with output voltage options of 1.2V, 1.6V, 1.8V, and 2.48V The 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 family offer a supply current that is virtually independent of supply voltage (with only.1µa/v variation with supply voltage) and do not require an external resistor. The has initial accuracies of.2% (A grade) and.4% (B grade) and temperature drift of 5ppm/ 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 is available in a tiny 3-pin SOT23 package. Applications Two-Cell, Battery-Operated Systems Battery-Operated Equipment Hand-Held Equipment Data-Acquisition Systems Industrial and Process-Control Systems Typical Application Circuit V CC IN OUT REFERENCE OUT Features Ultra-Low Supply Current: 5µA (max) 1.6V Output from 1.8V Input Ultra-Small, 3-Pin SOT23 Package Initial Accuracy: ±.2% (max) Low Temperature Drift: 5ppm/ C (max) 2mV Dropout Voltage Load Regulation (1mA Source): 7µV/mA (max) Line Regulation ( + 2mV) to 5.5V: 25µV/V (max) Four Output Voltage Options: 1.2V, 1.6V, 1.8V, 2.48V Ordering Information PART TEMP RANGE PIN- PACKAGE TOP MARK AEUR12-T -4 C to +85 C 3 SOT23-3 FZJH BEUR12-T -4 C to +85 C 3 SOT23-3 FZJI AEUR16-T -4 C to +85 C 3 SOT23-3 FZJJ BEUR16-T -4 C to +85 C 3 SOT23-3 FZJK AEUR18-T -4 C to +85 C 3 SOT23-3 FZJL BEUR18-T -4 C to +85 C 3 SOT23-3 FZJM AEUR21-T -4 C to +85 C 3 SOT23-3 FZJN BEUR21-T -4 C to +85 C 3 SOT23-3 FZJO * GND 1µF, MAX* PART VOLTAGE (V) Selector Guide INITIAL ACCURACY (%) *OPTIONAL AEUR ±.2 Pin Configuration BEUR ±.4 AEUR ±.2 TOP VIEW IN 1 3 GND BEUR ±.4 AEUR ±.2 BEUR ±.4 AEUR ±.2 OUT 2 BEUR ±.4 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 (Voltages Referenced to GND)...-.3V to +6V Output Short-Circuit Duration to GND or...continuous Continuous Power Dissipation (T A = +7 C) 3-Pin SOT23 (derate 4.mW/ C above +7 C)...32mW Operating Temperature Range...-4 C to +85 C Junction Temperature 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 (_ V) ( = 1.8V; C OUT = 47nF, I OUT = ; T A = T MIN to T MAX, unless otherwise noted. Typical values are at.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS A_12 (.2%) Output Voltage B_12 (.4%) V Output Voltage Temperature Drift TC (Note 2) 16 5 ppm/ o C Line Regulation Load Regulation 1.8V 5.5V 5 4 µv/v I OUT 1mA 9 7 µv/ma I OUT -1µA IOUT 2 9 µv/µa Sourcing to GND 3 Short-Circuit Current I SC Sinking from 6 Long-Term Stability Time 1hrs at 1 ppm Thermal Hysteresis (Note 4) 13 ppm DYNAMIC CHARACTERISTICS.1Hz to 1Hz 45 µvp-p Noise Voltage e OUT 1Hz to 1kHz 1 µvrms Ripple Rejection = 1.8V ±1mV (f = 12Hz) 85 db Turn-On Settling Time t R Settling to.1%; C OUT = 5nF 2 µs Capacitive-Load Stability Range C OUT (Note 2) 47 1 nf INPUT Supply Voltage Range Guaranteed by Line Regulation Test V 3 5 Quiescent Supply Current I IN T A = T MIN to T MAX 3 6 ma µa Change in Quiescent Supply Current vs. Input Voltage I IN / 1.8V 5.5V.1.5 µa/v 2

3 ELECTRICAL CHARACTERISTICS (_16 1.6V) ( = 1.8V; C OUT = 47nF, I OUT = ; T A = T MIN to T MAX, unless otherwise noted. Typical values are at.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS A_16 (.2%) Output Voltage B_16 (.4%) Output Voltage Temperature Drift Line Regulation Load Regulation TC (Note 2) 16 5 ppm/ o C 1.8V 5.5V 4 25 µv/v I OUT 1mA 9 7 µv/ma I OUT -75µA IOUT.6 5 µv/µa Dropout Voltage (Note 3) - I OUT = 1mA 1 2 mv Sourcing to GND 6 Short-Circuit Current I SC Sinking from 2 V ma Long-Term Stability Time 1hrs at 1 ppm Thermal Hysteresis (Note 4) 13 ppm DYNAMIC CHARACTERISTICS.1Hz to 1Hz 4 µvp-p Noise Voltage e OUT 1Hz to 1kHz 15 µvrms Ripple Rejection = 1.8V ±1mV (f = 12Hz) 85 db Turn-On Settling Time t R Settling to.1%; C OUT = 5nF 2 µs Capacitive-Load Stability Range C OUT (Note 2).1 1 nf INPUT Supply Voltage Range Guaranteed by Line Regulation Test V 3 5 Quiescent Supply Current I IN T A = T MIN to T MAX 3 6 µa Change in Quiescent Supply Current vs. Input Voltage I IN / 1.8V 5.5V.1.5 µa/v 3

4 ELECTRICAL CHARACTERISTICS (_18 1.8V) ( = 2.V; C OUT = 47nF, I OUT = ; T A = T MIN to T MAX, unless otherwise noted. Typical values are at.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS A_18 (.2%) Output Voltage B_18 (.4%) Output Voltage Temperature Drift TC (Note 2) 16 5 ppm/ o C Line Regulation Load Regulation 2.V 5.5V µv/v I OUT 1mA 9 8 µv/ma I OUT -1mA IOUT.4 5 µv/µa Dropout Voltage (Note 3) - I OUT = 1mA 1 2 mv Sourcing to GND 7.5 Short-Circuit Current I SC Sinking from 3 V ma Long-Term Stability Time 1hrs at 1 ppm Thermal Hysteresis (Note 4) 13 ppm DYNAMIC CHARACTERISTICS.1Hz to 1Hz 45 µvp-p Noise Voltage e OUT 1Hz to 1kHz 16 µvrms Ripple Rejection = 2.V ±1mV (f = 12Hz) 85 db Turn-On Settling Time t R Settling to.1%; C OUT = 5nF 2 µs Capacitive-Load Stability Range C OUT (Note 2).1 1 nf INPUT Supply Voltage Range Guaranteed by Line Regulation Test V 3 5 Quiescent Supply Current I IN T A = T MIN to T MAX 3 6 µa Change in Quiescent Supply Current vs. Input Voltage I IN / 2V 5.5V.1.5 µa/v 4

5 ELECTRICAL CHARACTERISTICS (_ V) ( = 2.25V; C OUT = 47nF, I OUT = ; T A = T MIN to T MAX, unless otherwise noted. Typical values are at.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS A_21 (.2%) Output Voltage B_21 (.4%) Output Voltage Temperature Drift TC (Note 2) 16 5 ppm/ o C Line Regulation Load Regulation 2.25V 5.5V µv/v I OUT 1mA 9 1 µv/ma I OUT -1mA IOUT.3 5 µv/µa Dropout Voltage (Note 3) - I OUT = 1mA 1 2 mv Sourcing to GND 1 Short-Circuit Current I SC Sinking from 4 V ma Long-Term Stability Time 1hrs at 1 ppm Thermal Hysteresis (Note 4) 13 ppm DYNAMIC CHARACTERISTICS.1Hz to 1Hz 5 µvp-p Noise Voltage e OUT 1Hz to 1kHz 175 µvrms Ripple Rejection = 2.25V ±1mV (f = 12Hz) 85 db Turn-On Settling Time t R Settling to.1%; C OUT = 5nF 2 µs Capacitive-Load Stability Range C OUT (Note 2).1 1 nf INPUT Supply Voltage Range Guaranteed by Line Regulation Test V 3 5 Quiescent Supply Current I IN T A = T MIN to T MAX 3 6 µa Change in Quiescent Supply Current vs. Input Voltage I IN / 2.25V 5.5V.1.5 µa/v Note 1: Devices are 1% production tested at and are guaranteed by design from T A = T MIN to T MAX. Note 2: Not production tested. Guaranteed by design. Note 3: Dropout voltage is the minimum input voltage at which changes.2% from at rated and is guaranteed by Load Regulation Test. Note 4: Thermal hysteresis is defined as the change in output voltage before and after temperature cycling of the device (from T A = T MIN to T MAX ). Initial measurement at is followed by temperature cycling the device to then to T A = -4 C and another measurement at is compared to the original measurement at. 5

6 (, unless otherwise noted.) VOLTAGE (V) _12 VOLTAGE DRIFT vs. TEMPERATURE toc1 VOLTAGE (V) _21 VOLTAGE DRIFT vs. TEMPERATURE Typical Operating Characteristics toc2 VOLTAGE (V) _12 LONG-TERM DRIFT toc TEMPERATURE ( C) TEMPERATURE ( C) TIME (HOURS) VOLTAGE (V) _21 LONG-TERM DRIFT toc4 VOLTAGE CHARGE (mv) _12 LINE REGULATION T A = -4 C toc5 VOLTAGE CHANGE (mv) _21 LINE REGULATION T A = -4 C toc TIME (HOURS) INPUT VOLTAGE (V) INPUT VOLTAGE (V) DROPOUT VOLTAGE (mv) _21 DROPOUT VOLTAGE vs. SOURCE CURRENT T A = -4 C SOURCE CURRENT (ma) toc7 VOLTAGE CHANGE (mv) _12 LOAD REGULATION T A = -4 C LOAD CURRENT (ma) toc8 VOLTAGE CHANGE (mv) _21 LOAD REGULATION T A = -4 C SOURCE CURRENT (ma) toc9 6

7 toc16 Precision, Micropower, 1.8V Supply, (, unless otherwise noted.) PSRR (db) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY k 1k 1k FREQUENCY (Hz) toc1 SUPPLY CURRENT (µa) Typical Operating Characteristics (continued) SUPPLY CURRENT vs. INPUT VOLTAGE _16 _21 _12 _ INPUT VOLTAGE (V) toc11 IMPEDANCE (Ω) 1k 1k 1k IMPEDANCE vs. FREQUENCY k 1k FREQUENCY (Hz) toc12 SUPPLY CURRENT (µa) SUPPLY CURRENT vs. TEMPERATURE = 5.5V = 3V toc13 2µV/div _21.1Hz TO 1Hz NOISE toc14 5mV/div _12 TURN-ON TRANSIENT C OUT = 5nF toc = 2.25V TEMPERATURE ( C) 1s/div 1µs/div _21 TURN-ON TRANSIENT _21 TURN-OFF TRANSIENT _12 LOAD-TRANSIENT RESPONSE toc18 C OUT = 5nF C OUT = 5nF toc17 I OUT 5µA/div C OUT = 15pF -3µA +1mA 5mV/div 5µs/div 2ms/div 1µs/div 7

8 (, unless otherwise noted.) I OUT 1mA/div _21 LOAD-TRANSIENT RESPONSE toc19 C OUT = 15pF -1mA +1mA Typical Operating Characteristics (continued) 2mV/div _12 LINE-TRANSIENT RESPONSE toc2 C OUT = 55pF 2mV/div _21 LINE-TRANSIENT RESPONSE toc21 C OUT = 55pF 5mV/div 5mV/div 1µs/div 1µs/div 1µs/div Detailed Description The 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 ( + 2mV) to 5.5V, and is available with output voltage options of 1.2V, 1.6V, 1.8V, and 2.48V. These devices can source up to 1mA with <2mV of dropout voltage, making them attractive for use in low-voltage applications. Applications Information Output/Load Capacitance These devices require a minimum of 1pF 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 1pF. PIN NAME FUNCTION 1 IN 2 OUT 3 GND Ground Turn-On Time These devices typically turn on and settle to within.1% of their final value in 2µs. The turn-on time can increase up to 1ms with the device operating at the minimum dropout voltage and the maximum load. TRANSISTOR COUNT: 87 PROCESS: BiCMOS Pin Description Supply Voltage Input. Bypass with a.1µf capacitor to ground. Reference Voltage Output. Bypass with at least 1pF to ground. (See Output/Load Capacitance section). Chip Information Supply Current The 5µA maximum supply current varies only.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 2µA beyond the nominal supply current. The input voltage source must be capable of providing this current to ensure reliable turn-on. 8

9 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 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, 12 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.