ISL95871C 데이터 시트보기 (PDF) - Renesas Electronics

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ISL95871C

SMBus Interfaced Battery Charger with Internal FETs

Renesas Electronics 

ISL95871C

Table of Contents

Absolute Maximum Ratings.............................................................. 6

Thermal Information .......................................................................... 6

Recommended Operating Conditions ............................................. 6

SMBus Timing Specification ............................................................. 8

Typical Operating Performance.........................................................9

Theory of Operation ......................................................................... 12

Introduction ................................................................................. 12

PWM Control................................................................................ 12

AC-Adapter Detection................................................................. 12

Current Measurement................................................................ 12

VDDP Regulator .......................................................................... 12

VDDSMB Supply .......................................................................... 12

Short Circuit Protection and 0V Battery Charging ................. 12

Undervoltage Detect and Battery Trickle Charging ............... 12

Over-Temperature Protection ................................................... 12

Overvoltage Protection .............................................................. 12

The System Management Bus.................................................. 13

General SMBus Architecture..................................................... 13

Data Validity ................................................................................ 13

START and STOP Conditions............................................................. 13

Acknowledge........................................................................................ 13

SMBus Transactions........................................................................... 14

Byte Format ................................................................................. 14

ISL95871C and SMBus.............................................................. 14

Battery Charger Registers ......................................................... 14

Enabling and Disabling Charging ............................................. 14

Setting Charge Voltage .............................................................. 15

Setting Charge Current .............................................................. 17

Setting Input-Current Limit........................................................ 18

Charger Timeout ......................................................................... 19

ISL95871C Data Byte Order ..................................................... 19

Writing to the Internal Registers .............................................. 19

Reading from the Internal Registers ....................................... 19

Application Information................................................................... 19

Inductor Selection....................................................................... 19

Output Capacitor Selection ....................................................... 19

Snubber Design........................................................................... 20

Input Capacitor Selection .......................................................... 20

Loop Compensation Design ...................................................... 20

Transconductance Amplifiers GMV, GMI and GMS................ 20

PWM Gain Fm ............................................................................. 20

Charge Current Control Loop .................................................... 21

Adapter Current Limit Control Loop......................................... 21

Voltage Control Loop.................................................................. 22

Output LC Filter Transfer Functions ......................................... 22

Compensation Break Frequency Equations ........................... 23

PCB Layout Considerations............................................................. 23

Power and Signal Layers Placement on the PCB ........................ 23

Component Placement.............................................................. 23

Signal Ground and Power Ground Connection....................... 23

AGND and VDD Pin ..................................................................... 24

PGND Pins.................................................................................... 24

PHASE Pins.................................................................................. 24

BOOT Pin ...................................................................................... 24

CSOP, CSON, CSIP and CSIN Pins ............................................ 24

DCIN Pin....................................................................................... 24

Copper Size for the Phase Node .............................................. 24

Identify the Power and Signal Ground .................................... 24

Clamping Capacitor for Switching MOSFET............................ 24

Revision History ................................................................................ 25

Products ............................................................................................. 25

Package Outline Drawing ............................................................... 26

FN6856 Rev 2.00

June 8, 2011

Page 5 of 26

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