20 V, 6 A, Synchronous, Step-Down DC-to-DC Regulator Data Sheet ADP2387 FEATURES TYPICAL APPLICATIONS CIRCUIT Input voltage range: 4.5 V to 20 V ADP2387 Integrated MOSFET: 44 m typical/11 m typical BST V PVIN IN C BST L Reference voltage: 0.6 V 1% C IN EN SW V OUT Continuous output current: 6 A C OUT PGOOD R Programmable current-limit threshold TOP ILIM Programmable switching frequency: 200 kHz to 1400 kHz FB R ILIM RT Precision enable and power good COMP R T R R External compensation VREG C BOT SS C VREG Internal soft start with external adjustable option GND PGND C C SS C Startup into a precharged output Supported by ADIsimPower design tool Figure 1. APPLICATIONS Communications infrastructure Networking and servers Industrial and instrumentation Healthcare and medical Intermediate power rail conversion DC-to-dc point of load applications GENERAL DESCRIPTION The ADP2387 is a synchronous step-down, dc-to-dc regulator with Other key features include undervoltage lockout (UVLO), an integrated 44 m , high-side power, metal oxide semiconductor overvoltage protection (OVP), overcurrent protection (OCP), field effect transistor (MOSFET) and an 11 m , synchronous short-circuit protection (SCP), and thermal shutdown (TSD). rectifier MOSFET to provide a high efficiency solution in a The ADP2387 operates over the 40C to +125C junction compact 4 mm 4 mm LFCSP. This device uses a peak current temperature range and is available in a 24-lead, 4 mm 4 mm mode, constant frequency pulse-width modulation (PWM) LFCSP. control scheme for excellent stability and transient response. 100 The switching frequency of the ADP2387 can be programmed 95 between 200 kHz to 1400 kHz. 90 The ADP2387 requires minimal external components and operates 85 from an input voltage of 4.5 V to 20 V. The output voltage can 80 be adjusted from 0.6 V to 90% of the input voltage and delivers 75 up to 6 A of continuous current. Each IC draws less than 110 A current from the input source when it is disabled. 70 65 This regulator targets high performance applications that require high efficiency and design flexibility. External compensation 60 V = 5.0V OUT and an adjustable soft start function provide design flexibility. 55 V = 3.3V OUT V = 1.2V OUT The power-good output and precision enable input provide 50 0 1 2 3 4 5 6 simple and reliable power sequencing. The programmable OUTPUT CURRENT (A) current-limit function allows the inductor to be optimized by Figure 2. Efficiency vs. Output Current, V = 12 V, f = 300 kHz IN SW output current. Rev. C 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 20162017 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 EFFICIENCY (%) 12643-002 12643-001ADP2387 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Applications Information .............................................................. 15 Applications ....................................................................................... 1 Input Capacitor Selection .......................................................... 15 Typical Applications Circuit ............................................................ 1 Output Voltage Setting .............................................................. 15 General Description ......................................................................... 1 Voltage Conversion Limitations ............................................... 15 Revision History ............................................................................... 2 Inductor Selection ...................................................................... 16 Functional Block Diagram .............................................................. 3 Output Capacitor Selection....................................................... 16 Specifications ..................................................................................... 4 Programming Input Voltage UVLO ........................................ 17 Absolute Maximum Ratings ............................................................ 6 Compensation Design ............................................................... 17 Thermal Resistance ...................................................................... 6 ADIsimPower Design Tool ....................................................... 18 ESD Caution .................................................................................. 6 Design Example .............................................................................. 19 Pin Configuration and Function Descriptions ............................. 7 Output Voltage Setting .............................................................. 19 Typical Performance Characteristics ............................................. 8 Frequency Setting ....................................................................... 19 Theory of Operation ...................................................................... 12 Current-Limit Threshold Setting ............................................. 19 Control Scheme .......................................................................... 12 Inductor Selection ...................................................................... 19 Precision Enable/Shutdown ...................................................... 12 Output Capacitor Selection....................................................... 20 Internal Regulator (VREG) ....................................................... 12 Compensation Components ..................................................... 20 Bootstrap Circuitry .................................................................... 12 Soft Start Time Program ........................................................... 20 Oscillator ..................................................................................... 12 Input Capacitor Selection .......................................................... 20 Soft Start ...................................................................................... 12 Recommended External Components .................................... 21 Power Good ................................................................................. 13 Circuit Board Layout Recommendations ................................... 22 Peak Current-Limit and Short-Circuit Protection ................. 13 Typical Applications Circuits ........................................................ 24 Overvoltage Protection (OVP) ................................................. 13 Outline Dimensions ....................................................................... 25 Undervoltage Lockout (UVLO) ............................................... 14 Ordering Guide .......................................................................... 25 Thermal Shutdown ..................................................................... 14 REVISION HISTORY 4/2017Rev. B to Rev. C Added Maximum Junction Temperature Parameter, Table 2 ....... 6 1/2016Revision B: Initial Version Rev. C Page 2 of 25