AD8452

Data Sheet

Rev. 0 | Page 2 of 34

TABLE OF CONTENTS

Features .............................................................................................. 1

 

Applications....................................................................................... 1

 

General Description ......................................................................... 1

 

Functional Block Diagram .............................................................. 1

 

Revision History ............................................................................... 2

 

Specifications..................................................................................... 3

 

Analog Front-End and Controller Specifications .................... 3

 

Pulse-Width Modulator Specifications ..................................... 5

 

Digital Interface Specifications................................................... 6

 

Power Supply................................................................................. 7

 

Temperature Range Specifications ............................................. 7

 

Absolute Maximum Ratings............................................................ 8

 

Thermal Resistance ...................................................................... 8

 

ESD Caution.................................................................................. 8

 

Pin Configuration and Function Descriptions............................. 9

 

Typical Performance Characteristics ........................................... 11

 

In-Amp Characteristics ............................................................. 11

 

Difference Amplifier Characteristics....................................... 12

 

CC and CV Loop Filter Amplifiers and VSET Buffer (except

where Noted)............................................................................... 13

 

Reference Characteristics .......................................................... 15

 

Pulse-Width Modulator............................................................. 16

 

Theory of Operation ...................................................................... 18

 

Introduction ................................................................................ 18

 

Instrumentation Amplifier (In-Amp) ..................................... 19

 

Difference Amplifier .................................................................. 20

 

CC and CV Loop Filter Amplifiers.......................................... 20

 

Charge and Discharge Control ................................................. 23

 

Input and Output Supply Pins .................................................. 23

 

Shutdown..................................................................................... 24

 

Undervoltage Lockout (UVLO) ............................................... 24

 

Soft Start ...................................................................................... 24

 

PWM Drive Signals.................................................................... 25

 

Peak Current Protection and Diode Emulation

(Synchronous)............................................................................. 25

 

Frequency and Phase Control .................................................. 26

 

Maximum Duty Cycle ............................................................... 26

 

Fault Input ................................................................................... 27

 

Thermal Shutdown (TSD) ........................................................ 27

 

Applications Information .............................................................. 28

 

Analog Controller ...................................................................... 28

 

Functional Description.............................................................. 28

 

Power Supply Connections ....................................................... 29

 

Current Sense In-Amp Connections ....................................... 29

 

Voltage Sense Differential Amplifier Connections................ 29

 

Battery Current and Voltage Control Inputs

(ISET and VSET) ........................................................................ 29

 

Loop Filter Amplifiers ............................................................... 30

 

Selecting Charge or Discharge Options .................................. 30

 

Select RCL and RCLVT for the Peak Current Limit .................. 30

 

Setting the Operating Frequency and Programming the

Synchonization Pin .................................................................... 31

 

Programming the Maximum Duty Cycle ............................... 32

 

Selecting CSS ................................................................................ 33

 

Additional Information ............................................................. 33

 

Outline Dimensions ....................................................................... 34

 

Ordering Guide .......................................................................... 34

 

REVISION HISTORY

10/2017—Revision 0: Initial Version