20 V, 6 A, Synchronous Step-Down DC-to-DC Regulator Data Sheet ADP2386 FEATURES TYPICAL APPLICATIONS CIRCUIT Input voltage: 4.5 V to 20 V ADP2386 Integrated MOSFET: 44 m/11 m 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 PGOOD OUT R TOP Programmable switching frequency: 200 kHz to 1.4 MHz SYNC FB Synchronizes to external clock: 200 kHz to 1.4 MHz RT 180 out of phase clock synchronization COMP R T R R VREG C Precision enable and power good BOT SS C VREG GND PGND C C External compensation SS C Internal soft start with external adjustable option Startup into a precharged output Figure 1. Supported by ADIsimPower design tool 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 ADP2386 is a synchronous step-down, dc-to-dc regulator with Other key features include undervoltage lockout (UVLO), an integrated 44 m , high-side power MOSFET and an 11 m , overvoltage protection (OVP), overcurrent protection (OCP), synchronous rectifier MOSFET to provide a high efficiency short-circuit protection (SCP), and thermal shutdown (TSD). solution in a compact 4 mm 4 mm LFCSP package. This device The ADP2386 operates over the 40C to +125C junction uses a peak current mode, constant frequency pulse-width temperature range and is available in a 24-lead, 4 mm 4 mm modulation (PWM) control scheme for excellent stability and LFCSP package. transient response. The switching frequency of the ADP2386 100 can be programmed from 200 kHz to 1.4 MHz. To minimize 95 system noise, the synchronization function allows the switching 90 frequency to be synchronized to an external clock. 85 The ADP2386 requires minimal external components and 80 operates from an input voltage of 4.5 V to 20 V. The output 75 voltage can be adjusted from 0.6 V to 90% of the input voltage and delivers up to 6 A of continuous current. Each IC draws less 70 than 110 A current from the input source when it is disabled. 65 This regulator targets high performance applications that require 60 V = 5.0V OUT high efficiency and design flexibility. External compensation and an 55 V = 3.3V OUT V = 1.2V OUT adjustable soft start function provide design flexibility. The power- 50 0 1 2 3 4 5 6 good output and precision enable input provide simple and reliable OUTPUT CURRENT (A) power sequencing. Figure 2. Efficiency vs. Output Current, V = 12 V, f = 300 kHz IN SW Rev. 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Technical Support www.analog.com EFFICIENCY (%) 10211-002 10211-001ADP2386 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 ...................................................................... 15 Specifications ..................................................................................... 3 Output Capacitor Selection....................................................... 16 Absolute Maximum Ratings ............................................................ 5 Programming the Input Voltage UVLO .................................. 17 Thermal Resistance ...................................................................... 5 Compensation Design ............................................................... 17 ESD Caution .................................................................................. 5 ADIsimPower Design Tool ....................................................... 18 Pin Configuration and Function Descriptions ............................. 6 Design Example .............................................................................. 19 Typical Performance Characteristics ............................................. 7 Output Voltage Setting (Design Example) .............................. 19 Functional Block Diagram ............................................................ 11 Frequency Setting ....................................................................... 19 Theory of Operation ...................................................................... 12 Inductor Selection (Design Example) ..................................... 19 Control Scheme .......................................................................... 12 Output Capacitor Selection (Design Example) ...................... 20 Precision Enable/Shutdown ...................................................... 12 Compensation Components ..................................................... 20 Internal Regulator (VREG) ....................................................... 12 Soft Start Time Program ........................................................... 20 Bootstrap Circuitry .................................................................... 12 Input Capacitor Selection (Design Example) ......................... 20 Oscillator ..................................................................................... 12 Recommended External Components .................................... 21 Synchronization .......................................................................... 12 Circuit Board Layout Recommendations ................................... 22 Soft Start ...................................................................................... 13 Typical Applications Circuits ........................................................ 23 Power Good ................................................................................. 13 Outline Dimensions ....................................................................... 24 Peak Current-Limit and Short-Circuit Protection ................. 13 Ordering Guide .......................................................................... 24 Overvoltage Protection (OVP) ................................................. 14 Undervoltage Lockout (UVLO) ............................................... 14 Thermal Shutdown ..................................................................... 14 REVISION HISTORY 10/15Rev. B to Rev. C Changes to Inductor Selection Section ........................................ 16 7/14Rev. A to Rev. B Changes to Table 2 and Table 3 ....................................................... 5 Changes to Inductor Selection Section ........................................ 15 Changes to Figure 33 ...................................................................... 19 Changes to Compensation Components Section....................... 20 Updated Outline Dimensions ....................................................... 24 4/13Rev. 0 to Rev. A Changes to Figure 4 and Figure 7 ................................................... 7 Updated Outline Dimensions ....................................................... 23 Changes to Ordering Guide .......................................................... 23 11/12Revision 0: Initial Version Rev. C Page 2 of 24