ISL95871CHRZ(2010) Ver la hoja de datos (PDF) - Intersil

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ISL95871CHRZ
(Rev.:2010)

SMBus Interfaced Battery Charger with Internal FETs

Intersil 

ISL95871C

Table of Contents

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

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

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

Electrical Specifications ................................................................................................................................ 6

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

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

Theory of Operation.................................................................................................................................... 11

Introduction ............................................................................................................................................. 11

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 ............................................................................................................................................13

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

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

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

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

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

Setting Charge Current .............................................................................................................................. 16

Setting Input-Current Limit ........................................................................................................................ 17

Charger Timeout ....................................................................................................................................... 18

ISL95871C Data Byte Order ....................................................................................................................... 18

Writing to the Internal Registers ................................................................................................................. 18

Reading from the Internal Registers ............................................................................................................ 18

Application Information.............................................................................................................................. 18

Inductor Selection ..................................................................................................................................... 18

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

Snubber Design ........................................................................................................................................ 19

Input Capacitor Selection ........................................................................................................................... 19

Loop Compensation Design......................................................................................................................... 19

Transconductance Amplifiers GMV, GMI and GMS .......................................................................................... 19

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

Charge Current Control Loop ...................................................................................................................... 20

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

Voltage Control Loop ................................................................................................................................. 21

Output LC Filter Transfer Functions.............................................................................................................. 21

Compensation Break Frequency Equations .................................................................................................... 22

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.................................................................................................................................... 23

PGND Pins................................................................................................................................................ 23

PHASE Pins .............................................................................................................................................. 23

BOOT Pin ................................................................................................................................................. 23

CSOP, CSON, CSIP and CSIN Pins ............................................................................................................... 23

DCIN Pin.................................................................................................................................................. 23

Copper Size for the Phase Node .................................................................................................................. 23

Identify the Power and Signal Ground .......................................................................................................... 23

Clamping Capacitor for Switching MOSFET .................................................................................................... 23

Revision History ......................................................................................................................................... 24

Products ..................................................................................................................................................... 24

Package Outline Drawing............................................................................................................................ 25

5

FN6856.1

September 29, 2010

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