Power Management IC for Circuit Breaker Applications Data Sheet ADP2450 FEATURES TYPICAL APPLICATION CIRCUIT V CT CURRENT DIODE OUT1 Boost shunt controller Adjustable output voltage range: 4.5 V to 36 V ACTUATOR ADP2450 C OUT1 Integrated boost shunt driver BOOST Programmable power detection threshold SHUNT CONTROL Buck regulator Input voltage range: 4.5 V to 36 V ACTUATOR DRIVER Continuous output current: 500 mA MCU Adjustable output voltage down to 0.6 V V OUT1 C V BST OUT2 BUCK V Fixed output options: 3.3 V and 5 V CORE C REGULATOR IN2 L 1.2 MHz fixed switching frequency C OUT2 SENSED Voltage monitoring and open-drain reset output VOLTAGE PGAs ADCs 4 programmable gain amplifiers GPIO1 GAIN Low power consumption SELECTION Programmable gain and output dc common voltage R GAIN Low offset operation amplifier for leakage and grounding ANALOG GPIO2 TRIP R TRP fault current detection Analog trip circuit with programmable trip threshold Figure 1. Actuator driver output APPLICATIONS Low voltage circuit breaker CT powered supply GENERAL DESCRIPTION The ADP2450 integrates one boost shunt controller with power reset signal is pulled low and can be used to reset the detection, one high efficiency buck regulator, four low offset, microprocessor. The monitoring supervisory circuit makes the low power consumption programmable gain amplifiers (PGAs), system more reliable. one low offset operation amplifier, a fast analog trip circuit, and The ADP2450 integrates four low offset, low power consumption an actuator driver. The ADP2450 is targeted for low voltage amplifiers. With the programmable gain features, the ADP2450 circuit breakers, such as the molded case circuit breaker (MCCB), provides accuracy measurement over a wide current input range and current transformer (CT) powered supply applications. based on the CT turn ratio. The boost output voltage can be up to 36 V and integrates a power A low offset operation amplifier is integrated in the ADP2450 detection circuit that prevents the circuit from power hiccups. for leakage current detection. The power detection threshold is programmable with resistors. The ADP2450 also integrates an analog trip circuit, which The buck regulator operates over a wide input voltage range of provides fast trip response and enhances system reliability. 4.5 V to 36 V, and the output voltage can be adjusted down to Additional protection includes buck overcurrent protection 0.6 V. The buck regulator provides output currents of up to (OCP) and system thermal shutdown (TSD). 500 mA. The buck regulator works in pulse-width modulation (PWM) mode with a fixed 1.2 MHz switching frequency, The ADP2450 operates over the 40C to +125C junction providing low output ripple voltage to the system. temperature range and is available in either a 32-lead LFCSP package or a 48-lead LQFP package. The output voltage of the buck regulator is monitored by the supervisory circuit. When the output voltage is below the monitoring threshold, 88% of VFB2 (FB2 regulation voltage), the 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 20182019 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. R R BOT1 TOP1 17088-001ADP2450 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 External MOSFET for Boost Shunt Controller ...................... 27 Applications ....................................................................................... 1 Boost Shunt Diode Selection .................................................... 27 Typical Application Circuit ............................................................. 1 Input Capacitor of Buck Regulator .......................................... 27 General Description ......................................................................... 1 Inductor Selection ...................................................................... 27 Revision History ............................................................................... 2 Output Capacitor of Buck Regulator ....................................... 28 Functional Block Diagram .............................................................. 4 Output Voltage Setting .............................................................. 28 Specif icat ions ..................................................................................... 5 External MOSFET for Actuator ............................................... 29 Boost Shunt Controller and Power Detection Specifications . 5 Design Example .............................................................................. 30 Buck Regulator Specifications .................................................... 6 Boost Shunt Output Voltage Setting ........................................ 30 Programmable Gain Amplifier and Analog Trip Boost Shunt Output Capacitor Setting .................................... 30 Specifications ................................................................................ 6 Boost Shunt MOSFET Setting .................................................. 30 Operation Amplifier Specifications ........................................... 8 Boost Shunt Diode Setting ........................................................ 30 Absolute Maximum Ratings ............................................................ 9 Buck Regulator Output Voltage Setting .................................. 30 Thermal Resistance ...................................................................... 9 Inductor Setting .......................................................................... 30 ESD Caution .................................................................................. 9 Buck Regulator Output Capacitor Setting .............................. 31 Pin Configurations and Function Descriptions ......................... 10 VPTH Resistor Divider Setting ................................................ 31 Typical Performance Characteristics ........................................... 12 Dummy Load Resistor Setting.................................................. 31 Theory of Operation ...................................................................... 22 PGA Gain Setting ....................................................................... 31 Boost Shunt Controller .............................................................. 22 Sense Resistor Setting ................................................................ 31 Power Detection ......................................................................... 22 Analog Trip Threshold Setting ................................................. 31 Internal Regulator ...................................................................... 22 Actuator MOSFET Setting ........................................................ 31 Buck Regulator ............................................................................ 23 Circuit Board Layout Recommendations ................................... 33 Bootstrap Circuit ........................................................................ 23 Ground Planes ............................................................................ 33 Power Monitor and Reset .......................................................... 23 Switch Node ................................................................................ 33 Programmable Gain Amplifier ................................................. 23 Feedback Paths ........................................................................... 33 Operational Amplifier ............................................................... 24 Power Traces ............................................................................... 33 Analog Trip Protection .............................................................. 24 Signal Paths ................................................................................. 33 Actuator Driver ........................................................................... 24 Gate Driver Paths ....................................................................... 33 Thermal Shutdown ..................................................................... 25 Typical Application Circuits ..................................................... 35 Applications Information .............................................................. 26 Factory-Programmable Options .................................................. 37 Output Capacitor of Boost Shunt Controller ......................... 26 Outline Dimensions ....................................................................... 38 Bridge Rectifier ........................................................................... 26 Ordering Guide .......................................................................... 39 Sense Resistor Selection ............................................................. 26 REVISION HISTORY 7/2019Rev. A to Rev. B Changes to Switch Node Parameter, Valley Current Limit Changes to Ordering Guide .......................................................... 39 Parameter, and Reset Threshold Hysteresis Parameter, Table 2 ........ 6 Change to Gain Drift Parameter, Table 3 ....................................... 7 4/2019Rev. 0 to Rev. A Added VTRPL Current Parameter, Table 3 and Endnote 3 to Added 48-lead LQFP .......................................................... Universal Analog Trip, VTRPL Current Parameter, Table 3 Renumbered Change to General Description Section ........................................ 1 Sequentially ........................................................................................ 7 Change to Figure 2 ........................................................................... 4 Change to Input Offset Parameter, Table 4 .................................... 8 Change to DET Output Low Voltage Parameter, Table 1 ................ 5 Changes to Table 5 and Table 6 ....................................................... 9 Rev. B Page 2 of 40