1 A, Low Dropout, CMOS Linear Regulator Data Sheet ADP1706/ADP1707/ADP1708 FEATURES TYPICAL APPLICATION CIRCUITS ADP1706 Maximum output current: 1 A 10nF 1 EN SS 8 Input voltage range: 2.5 V to 5.5 V 2 GND SENSE 7 Low shutdown current: <1 A V = 3.3V OUT 3 IN OUT 6 V = 5V IN Low dropout voltage: 345 mV at 1 A load 4 IN OUT 5 Initial accuracy: 1% 4.7F 4.7F Accuracy over line, load, and temperature: 2.5% Figure 1. ADP1706 with Fixed Output Voltage, 3.3 V 16 fixed output voltage options with soft start 0.75 V to 3.3 V (ADP1706) ADP1707 16 fixed output voltage options with tracking V 1 EN TRK 8 TRK 0.75 V to 3.3 V (ADP1707) 2 GND SENSE 7 V Adjustable output voltage option 3 IN OUT 6 OUT V = 5V IN 4 IN OUT 5 0.8 V to 5.0 V (ADP1708) 4.7F 4.7F Stable with small 4.7 F ceramic output capacitor V (V) OUT Excellent load/line transient response 3 Current limit and thermal overload protection 2 Logic-controlled enable 1 0 Available in an 8-lead, exposed paddle SOIC and 1 2 3 4 5 V (V) TRK a 3 mm 3 mm, 8-lead exposed paddle LFCSP Figure 2. ADP1707 with Output Voltage Tracking APPLICATIONS ADP1708 R2 Notebook computers 1 EN ADJ 8 R1 Memory components 2 GND SENSE 7 V = 0.8V(1 + R1/R2) Telecommunications equipment OUT 3 IN OUT 6 V = 5V IN Network equipment 4 IN OUT 5 4.7F 4.7F DSP/FPGA/microprocessor supplies Instrumentation equipment/data acquisition systems Figure 3. ADP1708 with Adjustable Output Voltage, 0.8 V to 5.0 V GENERAL DESCRIPTION ADP1707 and ADP1708 contain internal soft start capacitors The ADP1706/ADP1707/ADP1708 are CMOS, low dropout that give a typical start-up time of 100 s. The ADP1707 linear regulators that operate from 2.5 V to 5.5 V and provide includes a tracking feature that allows the output to follow an up to 1 A of output current. Using an advanced proprietary external voltage rail or reference. architecture, they provide high power supply rejection and achieve excellent line and load transient response with a small The ADP1706/ADP1707/ADP1708 are available in an 8-lead, 4.7 F ceramic output capacitor. exposed paddle SOIC package and an 8-lead, 3 mm 3 mm exposed paddle LFCSP, making them not only very compact The ADP1706/ADP1707 are available in 16 fixed output voltage solutions but also providing excellent thermal performance for options. The ADP1708 is available in an adjustable version, applications requiring up to 1 A of output current in a small, which allows output voltages that range from 0.8 V to 5.0 V via low profile footprint. an external divider. The ADP1706 allows an external soft start capacitor to be connected to program the start-up time the Rev. A 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 20072016 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 06640-003 06640-001 06640-002ADP1706/ADP1707/ADP1708 Data Sheet TABLE OF CONTENTS Soft Start Function (ADP1706) ................................................ 12 Features .............................................................................................. 1 Adjustable Output Voltage (ADP1708) ................................... 13 Applications ....................................................................................... 1 Track Mode (ADP1707) ............................................................ 13 Typical Application Circuits ............................................................ 1 Enable Feature ............................................................................ 13 General Description ......................................................................... 1 Applications Information .............................................................. 14 Revision History ............................................................................... 2 Capacitor Selection .................................................................... 14 Specifications ..................................................................................... 3 Voltage Tracking Applications .................................................. 14 Absolute Maximum Ratings ............................................................ 5 Current Limit and Thermal Overload Protection ................. 15 Thermal Resistance ...................................................................... 5 Thermal Considerations ............................................................ 15 ESD Caution .................................................................................. 5 PCB Layout Considerations ...................................................... 17 Pin Configurations and Function Descriptions ........................... 6 Outline Dimensions ....................................................................... 18 Typical Performance Characteristics ............................................. 9 Ordering Guide .......................................................................... 19 Theory of Operation ...................................................................... 12 REVISION HISTORY 5/2016Rev. 0 to Rev. A Changed CP-8-2 to CP-8-13 ........................................ Throughout Changes to Figure 4, Figure 5, and Table 4 ................................... 6 Moved Figure 6 and Figure 7 .......................................................... 7 Changes to Figure 6 and Figure 7 ................................................... 7 Added Table 5 Renumbered Sequentially .................................... 7 Moved Figure 8 and Figure 9 .......................................................... 8 Changes to Figure 8 and Figure 9 ................................................... 8 Added Table 6 .................................................................................... 8 Updated Outline Dimensions ....................................................... 18 Changes to Ordering Guide .......................................................... 19 6/2007Revision 0: Initial Version Rev. A Page 2 of 20