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Analog Devices Semiconductor Electronic Components Datasheet

ADP2450 Datasheet

Power Management

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Data Sheet
FEATURES
Boost shunt controller
Adjustable output voltage range: 4.5 V to 36 V
Integrated boost shunt driver
Programmable power detection threshold
Buck regulator
Input voltage range: 4.5 V to 36 V
Continuous output current: 500 mA
Adjustable output voltage down to 0.6 V
Fixed output options: 3.3 V and 5 V
1.2 MHz fixed switching frequency
Voltage monitoring and open-drain reset output
4 programmable gain amplifiers
Low power consumption
Programmable gain and output dc common voltage
Low offset operation amplifier for leakage and grounding
fault current detection
Analog trip circuit with programmable trip threshold
Actuator driver output
APPLICATIONS
Low voltage circuit breaker
CT powered supply
GENERAL DESCRIPTION
The ADP2450 integrates one boost shunt controller with power
detection, one high efficiency buck regulator, four low offset,
low power consumption programmable gain amplifiers (PGAs),
one low offset operation amplifier, a fast analog trip circuit, and
an actuator driver. The ADP2450 is targeted for low voltage
circuit breakers, such as the molded case circuit breaker (MCCB),
and current transformer (CT) powered supply applications.
The boost output voltage can be up to 36 V and integrates a power
detection circuit that prevents the circuit from power hiccups.
The power detection threshold is programmable with resistors.
The buck regulator operates over a wide input voltage range of
4.5 V to 36 V, and the output voltage can be adjusted down to
0.6 V. The buck regulator provides output currents of up to
500 mA. The buck regulator works in pulse-width modulation
(PWM) mode with a fixed 1.2 MHz switching frequency,
providing low output ripple voltage to the system.
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
Power Management IC for
Circuit Breaker Applications
ADP2450
TYPICAL APPLICATION CIRCUIT
CT CURRENT
DIODE
VOUT1
ADP2450
BOOST
SHUNT
CONTROL
ACTUATOR
COUT1
VOUT1
CIN2
SENSED
VOLTAGE
RTRP
ACTUATOR
DRIVER
BUCK
REGULATOR
PGAs
GAIN
SELECTION
ANALOG
TRIP
CBST
MCU
VOUT2
L VCORE
COUT2
ADCs
GPIO1
RGAIN
GPIO2
Figure 1.
reset signal is pulled low and can be used to reset the
microprocessor. The monitoring supervisory circuit makes the
system more reliable.
The ADP2450 integrates four low offset, low power consumption
amplifiers. With the programmable gain features, the ADP2450
provides accuracy measurement over a wide current input range
based on the CT turn ratio.
A low offset operation amplifier is integrated in the ADP2450
for leakage current detection.
The ADP2450 also integrates an analog trip circuit, which
provides fast trip response and enhances system reliability.
Additional protection includes buck overcurrent protection
(OCP) and system thermal shutdown (TSD).
The ADP2450 operates over the −40°C to +125°C junction
temperature range and is available in either a 32-lead LFCSP
package or a 48-lead LQFP package.
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
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2018–2019 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

ADP2450 Datasheet

Power Management

No Preview Available !

ADP2450
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
Typical Application Circuit ............................................................. 1 
General Description ......................................................................... 1 
Revision History ............................................................................... 2 
Functional Block Diagram .............................................................. 4 
Specifications..................................................................................... 5 
Boost Shunt Controller and Power Detection Specifications. 5 
Buck Regulator Specifications .................................................... 6 
Programmable Gain Amplifier and Analog Trip
Specifications ................................................................................ 6 
Operation Amplifier Specifications ........................................... 8 
Absolute Maximum Ratings............................................................ 9 
Thermal Resistance ...................................................................... 9 
ESD Caution.................................................................................. 9 
Pin Configurations and Function Descriptions ......................... 10 
Typical Performance Characteristics ........................................... 12 
Theory of Operation ...................................................................... 22 
Boost Shunt Controller.............................................................. 22 
Power Detection ......................................................................... 22 
Internal Regulator ...................................................................... 22 
Buck Regulator............................................................................ 23 
Bootstrap Circuit ........................................................................ 23 
Power Monitor and Reset .......................................................... 23 
Programmable Gain Amplifier................................................. 23 
Operational Amplifier ............................................................... 24 
Analog Trip Protection .............................................................. 24 
Actuator Driver........................................................................... 24 
Thermal Shutdown..................................................................... 25 
Applications Information .............................................................. 26 
Output Capacitor of Boost Shunt Controller ......................... 26 
Bridge Rectifier ........................................................................... 26 
Sense Resistor Selection............................................................. 26 
External MOSFET for Boost Shunt Controller ...................... 27 
Boost Shunt Diode Selection .................................................... 27 
Input Capacitor of Buck Regulator .......................................... 27 
Inductor Selection ...................................................................... 27 
Output Capacitor of Buck Regulator ....................................... 28 
Output Voltage Setting .............................................................. 28 
External MOSFET for Actuator ............................................... 29 
Design Example .............................................................................. 30 
Boost Shunt Output Voltage Setting ........................................ 30 
Boost Shunt Output Capacitor Setting.................................... 30 
Boost Shunt MOSFET Setting .................................................. 30 
Boost Shunt Diode Setting........................................................ 30 
Buck Regulator Output Voltage Setting .................................. 30 
Inductor Setting.......................................................................... 30 
Buck Regulator Output Capacitor Setting .............................. 31 
VPTH Resistor Divider Setting ................................................ 31 
Dummy Load Resistor Setting.................................................. 31 
PGA Gain Setting ....................................................................... 31 
Sense Resistor Setting ................................................................ 31 
Analog Trip Threshold Setting ................................................. 31 
Actuator MOSFET Setting ........................................................ 31 
Circuit Board Layout Recommendations ................................... 33 
Ground Planes ............................................................................ 33 
Switch Node ................................................................................ 33 
Feedback Paths ........................................................................... 33 
Power Traces ............................................................................... 33 
Signal Paths ................................................................................. 33 
Gate Driver Paths ....................................................................... 33 
Typical Application Circuits ..................................................... 35 
Factory-Programmable Options .................................................. 37 
Outline Dimensions ....................................................................... 38 
Ordering Guide .......................................................................... 39 
REVISION HISTORY
7/2019—Rev. A to Rev. B
Changes to Ordering Guide .......................................................... 39
4/2019—Rev. 0 to Rev. A
Added 48-lead LQFP..........................................................Universal
Change to General Description Section ........................................ 1
Change to Figure 2 ........................................................................... 4
Change to DET Output Low Voltage Parameter, Table 1 ................ 5
Changes to Switch Node Parameter, Valley Current Limit
Parameter, and Reset Threshold Hysteresis Parameter, Table 2........6
Change to Gain Drift Parameter, Table 3 .......................................7
Added VTRPL Current Parameter, Table 3 and Endnote 3 to
Analog Trip, VTRPL Current Parameter, Table 3; Renumbered
Sequentially ........................................................................................7
Change to Input Offset Parameter, Table 4 ....................................8
Changes to Table 5 and Table 6 .......................................................9
Rev. B | Page 2 of 40


Part Number ADP2450
Description Power Management
Maker Analog Devices
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