3 A, 36 V, Synchronous Step-Down DC-to-DC Regulator Data Sheet ADP2443 FEATURES TYPICAL APPLICATION CIRCUIT Continuous output current: 3 A ADP2443 Input voltage: 4.5 V to 36 V V IN PVIN BST C L Integrated MOSFETs: 98 m/35 m BST EN SW V C OUT IN Reference voltage: 0.6 V 1% C R R OUT RAMP TOP RAMP Fast minimum on time: 50 ns PGOOD FB Programmable switching frequency: 200 kHz to 1.8 MHz RT/SYNC COMP Synchronizes to external clock: 200 kHz to 1.8 MHz R R R T VREG SS C BOT Precision enable and power good C C C VREG SS C GND PGND Cycle-by-cycle current limit with hiccup protection External compensation Programmable soft start time Figure 1. Startup into a precharged output Supported by ADIsimPower design tool APPLICATIONS Intermediate power rail conversion Multicell battery powered systems Process control and industrial automation Healthcare and medical Networking and servers GENERAL DESCRIPTION The ADP2443 is synchronous step-down, dc-to-dc regulator Other key features include undervoltage lockout (UVLO), with an integrated 98 m, high-side power metal oxide semicon- overvoltage protection (OVP), overcurrent protection (OCP), ductor field effect transistor (MOSFET) and a 35 m, synchronous short-circuit protection (SCP), and thermal shutdown (TSD). rectifier MOSFET to provide a high efficiency solution in a The ADP2443 operates over the 40C to +125C operating compact 4 mm 4 mm LFCSP package. The regulators operate junction temperature range and is available in a 24-lead, 4 mm from an input voltage range of 4.5 V to 36 V. The output voltage 4 mm LFCSP package. can be adjusted down to 0.6 V and deliver up to 3 A of 100 continuous current. The fast 50 ns minimum on time allows the 95 regulators convert high input voltage to low output voltage at high 90 frequency. 85 The ADP2443 uses an emulated current mode, constant frequency 80 pulse-width modulation (PWM) control scheme for excellent 75 stability and transient response. The switching frequency of the ADP2443 can be programmed from 200 kHz to 1.8 MHz. The 70 V = 5V synchronization function allows the switching frequency be syn- OUT 65 V = 3.3V OUT chronized with an external clock to minimize the system noise. 60 The ADP2443 targets high performance applications that require 55 high efficiency and design flexibility. External compensation 50 and an adjustable soft start function provide design flexibility. 0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT CURRENT (A) The power-good output and precision enable input provide Figure 2. Efficiency vs. Output Current, VIN = 24 V, fSW = 300 kHz simple and reliable power sequencing. Rev. 0 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 2016 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 (%) 14794-002 14794-001ADP2443 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Applications Information .............................................................. 15 Applications ....................................................................................... 1 Input Capacitor Selection .......................................................... 15 Typical Application Circuit ............................................................. 1 Output Voltage Setting .............................................................. 15 General Description ......................................................................... 1 Voltage Conversion Limitations ............................................... 15 Revision History ............................................................................... 2 Inductor Selection ...................................................................... 15 Functional Block Diagram .............................................................. 3 Output Capacitor Selection....................................................... 17 Specifications ..................................................................................... 4 Programming Input Voltage UVLO ........................................ 17 Absolute Maximum Ratings ............................................................ 6 Slope Compensation Setting ..................................................... 17 Thermal Resistance ...................................................................... 6 Compensation Design ............................................................... 17 ESD Caution .................................................................................. 6 ADIsimPower Design Tool ....................................................... 18 Pin Configuration and Function Descriptions ............................. 7 Design Example .............................................................................. 19 Typical Performance Characteristics ............................................. 8 Output Voltage Setting .............................................................. 19 Theory of Operation ...................................................................... 13 Frequency Setting ....................................................................... 19 Control Scheme .......................................................................... 13 Inductor Selection ...................................................................... 19 Precision Enable/Shutdown ...................................................... 13 Output Capacitor Selection....................................................... 20 Internal Regulator (VREG) ....................................................... 13 Slope Compensation Setting ..................................................... 20 Bootstrap Circuitry .................................................................... 13 Compensation Components ..................................................... 20 Oscillator ..................................................................................... 13 Soft Start Time Program ........................................................... 20 Synchronization .......................................................................... 13 Input Capacitor Selection .......................................................... 20 Soft Start ...................................................................................... 14 Recommended External Components .................................... 21 Power Good ................................................................................. 14 Printed Circuit Board Layout Recommendations ..................... 22 Peak Current-Limit and Short-Circuit Protection ................. 14 Typical Applications Circuits ........................................................ 23 Overvoltage Protection (OVP) ................................................. 14 Outline Dimensions ....................................................................... 24 Undervoltage Lockout (UVLO) ............................................... 14 Ordering Guide .......................................................................... 24 Thermal Shutdown ..................................................................... 14 REVISION HISTORY 9/2016Revision 0: Initial Version Rev. 0 Page 2 of 24