Precision, Micropower LDO Voltage References in TSOT ADR121/ADR125/ADR127 FEATURES PIN CONFIGURATION Initial accuracy 1 1 NC 1 6 NC A grade: 0.24% ADR12x 1 GND 2 TOP VIEW 5 NC B grade: 0.12% (Not to Scale) Maximum temperature coefficient V 3 4 V IN OUT A grade: 25 ppm/C NC = NO CONNECT B grade: 9 ppm/C 1 MUST BE LEFT FLOATING Low dropout: 300 mV for ADR121/ADR125 Figure 1. High output current: +5 mA/2 mA Low typical operating current: 85 A Input range: 2.7 V to 18 V for ADR127 Temperature range: 40C to +125C Tiny TSOT (UJ-6) package APPLICATIONS Battery-powered instrumentation Portable medical equipment Data acquisition systems Automotive GENERAL DESCRIPTION The ADR121/ADR125/ADR127 are a family of micropower, The ADR12x is a low dropout voltage reference, requiring only high precision, series mode, band gap references with sink and 300 mV for the ADR121/ADR125 and 1.45 V for the ADR127 source capability. The parts feature high accuracy and low above the nominal output voltage on the input to provide a power consumption in a tiny package. The ADR12x design stable output voltage. This low dropout performance, coupled includes a patented temperature-drift curvature correction with the low 85 A operating current, makes the ADR12x ideal technique that minimizes the nonlinearities in the output for battery-powered applications. voltage vs. temperature characteristics. Available in an extended industrial temperature range of 40C to +125C, the ADR121/ADR125/ADR127 are housed in the tiny TSOT (UJ-6) package. Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 20062008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 05725-001ADR121/ADR125/ADR127 TABLE OF CONTENTS Features .............................................................................................. 1 Terminology .................................................................................... 15 Applications ....................................................................................... 1 Theory of Operation ...................................................................... 16 Pin Configuration ............................................................................. 1 Power Dissipation Considerations ........................................... 16 General Description ......................................................................... 1 Input Capacitor ........................................................................... 16 Revision History ............................................................................... 2 Output Capacitor ........................................................................ 16 Specif icat ions ..................................................................................... 3 Applications Information .............................................................. 17 ADR121 Electrical Characteristics ............................................. 3 Basic Voltage Reference Connection ....................................... 17 ADR125 Electrical Characteristics ............................................. 4 Stacking Reference ICs for Arbitrary Outputs ....................... 17 ADR127 Electrical Characteristics ............................................. 5 Negative Precision Reference Without Precision Resistors .. 17 Absolute Maximum Ratings ............................................................ 6 General-Purpose Current Source ............................................ 17 Thermal Resistance ...................................................................... 6 Outline Dimensions ....................................................................... 18 ESD Caution .................................................................................. 6 Ordering Guide .......................................................................... 18 Typical Performance Characteristics ............................................. 7 REVISION HISTORY 1/08Rev. A to Rev. B Changes to Table 1 ............................................................................ 3 Changes to Table 2 ............................................................................ 4 Changes to Table 3 .............................................................................5 Changes to Figure 52 ...................................................................... 17 Changes to Ordering Guide ......................................................... 18 5/07Rev. 0 to Rev. A Changes to Table 1 ............................................................................ 3 Changes to Table 2 ............................................................................ 4 Changes to Table 3 ............................................................................ 5 Added Thermal Hysteresis Equation ............................................. 7 Changes to Ordering Guide .......................................................... 18 6/06Revision 0: Initial Version Rev. B Page 2 of 20