Buck or Boost, PWM Controller for Battery Test Solutions Data Sheet ADP1972 FEATURES GENERAL DESCRIPTION Input voltage range: 6 V to 60 V The ADP1972 is a constant frequency, voltage mode, pulse-width On-board 5 V low dropout regulator modulation (PWM) controller for buck or boost, dc-to-dc, Selective buck or boost mode asynchronous applications. The ADP1972 is designed for use in Excellent PWM linearity with high amplitude PWM sawtooth asynchronous battery testing applications with an external, high 4.0 V p-p voltage field effect transistor (FET), half bridge driver, and an FAULT input compatible with AD8450 external control device, such as the AD8450. The asynchronous COMP input compatible with AD8450 device operates as a buck converter in battery charge mode and Adjustable frequency from 50 kHz to 300 kHz operates as a boost converter in recycle mode to recycle energy Synchronization output or input with adjustable phase shift to the input bus. Programmable maximum duty cycle The ADP1972 high voltage, VIN supply pin can withstand a Maximum internal duty cycle: 98% maximum operating voltage of 60 V and reduces the need for Programmable soft start additional system supply voltages. The ADP1972 has integrated Peak hiccup current limit protection features such as precision enable, pin selective buck or boost Input voltage UVLO protection mode operation, internal and external synchronization control TSD protection with programmable phase shift, programmable maximum duty 16-lead TSSOP cycle, and programmable peak hiccup current limit. Additional protection features include soft start to limit input inrush current APPLICATIONS during startup, input voltage undervoltage lockout (UVLO), PWM battery test systems with recycle capability including and thermal shutdown (TSD). The ADP1972 also has a COMP hybrid vehicles, PCs, and camera batteries pin to provide external control of the PWM operation and a Compatible with AD8450 constant voltage (CV) and constant FAULT pin that can be signaled to disable the DH and DL current (CC) monitors outputs if a fault condition occurs externally to the ADP1972. The ADP1972 is available in a 16-lead TSSOP package. TYPICAL APPLICATION CIRCUIT 24V VIN SYNC 24V RECYLCING DC BUS VREG SCFG DH MODE HV FROM MOSFET CENTRAL PC DRIVER EN ADP1972 DL COMP FROM ANALOG IC FAULT CL FREQ GND SENSE SS DMAX GND Figure 1. Rev. B 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 2014 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. BATTERY 11884-001ADP1972 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 PWM Drive Signals .................................................................... 12 Applications ....................................................................................... 1 External COMP Control ........................................................... 12 General Description ......................................................................... 1 Current Limit .............................................................................. 12 Typical Application Circuit ............................................................. 1 PWM Frequency Control .......................................................... 12 Revision History ............................................................................... 2 Maximum Duty Cycle ............................................................... 13 Specifications ..................................................................................... 3 External Fault Signaling ............................................................ 13 Absolute Maximum Ratings ............................................................ 5 Thermal Shutdown (TSD) ........................................................ 13 Thermal Operating Ranges ......................................................... 5 Applications Information .............................................................. 14 ESD Caution .................................................................................. 5 Buck or Boost Selection ............................................................. 14 Pin Configuration and Function Descriptions ............................. 6 Selecting RS to Set the Current Limit ....................................... 14 Typical Performance Characteristics ............................................. 7 Adjusting the Operating Frequency ........................................ 14 Theory of Operation ...................................................................... 10 Programming the Maximum Duty Cycle ............................... 15 Supply Pins .................................................................................. 10 Adjusting the Soft Start Period ................................................. 16 EN/Shutdown .............................................................................. 11 PCB Layout Guidelines .................................................................. 17 Undervoltage Lockout (UVLO) ............................................... 11 Outline Dimensions ....................................................................... 18 Soft Start ...................................................................................... 11 Ordering Guide .......................................................................... 18 Operating Modes ........................................................................ 11 REVISION HISTORY 11/14Rev. A to Rev. B Changes to EN Threshold Falling Parameter, Unit Column, Table 1 ................................................................................ 4 Changes to the Programming Maximum Duty Cycle Section ...... 15 6/14Rev. 0 to Rev. A Changes to Maximum Duty Cycle Range Parameter, Table 1 .... 3 Changes to Equation 7 and Equation 9 ....................................... 15 Changes to Ordering Guide .......................................................... 18 1/14Revision 0: Initial Version Rev. B Page 2 of 18