5.5 V Input, 500 mA, Low Quiescent Current, CMOS Linear Regulators Data Sheet ADP124/ADP125 FEATURES TYPICAL APPLICATION CIRCUITS Input voltage supply range: 2.3 V to 5.5 V 1 VOUT VIN 8 V = 3.3V V = 5.5V OUT IN 500 mA maximum output current ADP124 Fixed and adjustable output voltage versions 2 VOUT VIN 7 C2 C1 1% initial accuracy VOUT NC 3 6 SENSE Up to 31 fixed-output voltage options available ON from 1.75 V to 3.3 V 4 5 GND EN OFF Adjustable-output voltage range from 0.8 V to 5.0 V Very low dropout voltage: 130 mV Figure 1. ADP124 with Fixed Output Voltage Low quiescent current: 45 A Low shutdown current: <1 A V = 3.3V OUT 1 8 VOUT VIN V = 5.5V Excellent PSRR performance: 60 dB at 100 kHz IN ADP125 Excellent load/line transient response 2 VOUT VIN 7 C2 R1 C1 Optimized for small 1.0 F ceramic capacitors NC Current limit and thermal overload protection 3 ADJ 6 Logic controlled enable R2 ON 4 5 GND EN OFF Compact 8-lead exposed paddle MSOP and LFCSP packages APPLICATIONS Figure 2. ADP125 with Adjustable Output Voltage Digital camera and audio devices Portable and battery-powered equipment Automatic meter reading (AMR) meters GPS and location management units Medical instrumentation Point of load power GENERAL DESCRIPTION The ADP124/ADP125 are low quiescent current, low dropout The ADP124/ADP125 are specifically designed for stable linear regulators. They are designed to operate from an input operation with tiny 1 F ceramic input and output capacitors to voltage between 2.3 V and 5.5 V and to provide up to 500 mA meet the requirements of high performance, space constrained of output current. The low 130 mV dropout voltage at a 500 mA applications. load improves efficiency and allows operation over a wide input The ADP124/ADP125 have an internal soft start that gives a voltage range. constant start-up time of 350 s. Short-circuit protection and The low 210 A of quiescent current with a 500 mA load makes the thermal overload protection circuits prevent damage in adverse ADP124/ADP125 ideal for battery-operated portable equipment. conditions. The ADP124/ADP125 are available in 8-lead exposed paddle MSOP and LFCSP packages. When compared The ADP124 is capable of 31 fixed-output voltages from 1.75 V with the standard MSOP and LFCSP packages, the exposed to 3.3 V. The ADP125 is the adjustable version of the device and paddle MSOP and LFCSP packages have lower thermal resistance allows the output voltage to be set between 0.8 V and 5.0 V by ( ). The lower thermal resistance package allows the ADP124/ JA an external voltage divider. ADP125 to meet the needs of a variety of portable applications while minimizing the rise in junction temperature. Rev. D Document Feedback 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 20092014 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com 08476-002 08476-001ADP124/ADP125 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................7 Applications ....................................................................................... 1 Theory of Operation ...................................................................... 11 Typical Application Circuits ............................................................ 1 Applications Information .............................................................. 12 General Description ......................................................................... 1 Capacitor Selection .................................................................... 12 Revision History ............................................................................... 2 Undervoltage Lockout ............................................................... 13 Specifications ..................................................................................... 3 Enable Feature ............................................................................ 13 Recommended Capacitor Specifications ................................... 4 Current Limit and Thermal Overload Protection ................. 14 Absolute Maximum Ratings ............................................................ 5 Thermal Considerations ............................................................ 14 Thermal Data ................................................................................ 5 Junction Temperature Calculations ......................................... 15 Thermal Resistance ...................................................................... 5 Printed Circuit Board Layout Considerations........................ 16 ESD Caution .................................................................................. 5 Outline Dimensions ....................................................................... 17 Pin Configurations and Function Descriptions ........................... 6 Ordering Guide .......................................................................... 18 REVISION HISTORY 12/14Rev. C to Rev. D Updated Figure 46 Outline Dimensions ..................................... 17 Changes to Ordering Guide .......................................................... 18 6/12Rev. B to Rev. C Changes to Table 3 ............................................................................ 5 Updated Outline Dimensions ....................................................... 17 4/12Rev. A to Rev. B Updated Outline Dimensions ....................................................... 17 Changes to Ordering Guide .......................................................... 18 9/10Rev. 0 to Rev. A Added 8-Lead LFCSP Package ..................................... Throughout Added Figure 4 and Figure 6 (Renumbered Sequentially) ......... 6 Changes to Thermal Conditions Section and Table 6 ............... 14 Added Table 7 .................................................................................. 14 Changes to Junction Temperature Calculations Section ........... 15 Added Figure 44 .............................................................................. 16 Updated Outline Dimensions ....................................................... 17 Changes to Ordering Guide .......................................................... 18 12/09Revision 0: Initial Version Rev. D Page 2 of 20