ADP2450

Data Sheet

Rev. B | Page 2 of 40

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