ISL88731CHRTZ-T Intersil, ISL88731CHRTZ-T Datasheet - Page 5

• Manufacturer Part Number: ISL88731CHRTZ-T
• Description: IC BATT CHRGR SMBUS LVL2 28TQFN
• Manufacturer: Intersil

Specifications of ISL88731CHRTZ-T

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 8 V ~ 26 V
• Operating Temperature: -10°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 28-WFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table of Contents
Absolute Maximum Ratings.............................................................. 6
Thermal Information .......................................................................... 6
Typical Operating Performance.................................................................9
Theory of Operation ......................................................................... 11
Byte Format....................................................................................... 13
ISL88731C and SMBus ................................................................... 13
Battery Charger Registers ............................................................... 14
Enabling and Disabling Charging ................................................... 14
Setting Charge Voltage .................................................................... 14
Setting Charge Current .................................................................... 15
Setting Input-Current Limit ............................................................. 16
Charger Timeout............................................................................... 17
ISL88731C Data Byte Order ........................................................... 17
Writing to the Internal Registers .................................................... 17
Reading from the Internal Registers ............................................. 17
Introduction ................................................................................. 11
PWM Control................................................................................ 11
AC-Adapter Detection................................................................. 11
Current Measurement................................................................ 11
VDDP Regulator .......................................................................... 11
VDDSMB Supply .......................................................................... 11
Short Circuit Protection and 0V Battery Charging ................. 11
Undervoltage Detect and Battery Trickle Charging ............... 11
Over-Temperature Protection ................................................... 12
Overvoltage Protection .............................................................. 12
The System Management Bus.................................................. 12
General SMBus Architecture..................................................... 12
Data Validity ................................................................................ 12
START and STOP Conditions............................................................. 12
Acknowledge........................................................................................ 13
SMBus Transactions........................................................................... 13
5
ISL88731C
Application Information................................................................... 17
PCB Layout Considerations ............................................................. 22
Revision History ................................................................................ 24
Products ............................................................................................. 24
Package Outline Drawing ............................................................... 25
Inductor Selection ...................................................................... 17
Output Capacitor Selection ....................................................... 17
MOSFET Selection ...................................................................... 18
Snubber Design .......................................................................... 19
Input Capacitor Selection.......................................................... 19
Loop Compensation Design...................................................... 19
Transconductance Amplifiers GMV, GMI and GMS ............... 19
PWM Gain Fm ............................................................................. 19
Charge Current Control Loop .................................................... 20
Adapter Current Limit Control Loop......................................... 20
Voltage Control Loop.................................................................. 21
Output LC Filter Transfer Functions ......................................... 21
Compensation Break Frequency Equations ........................... 22
Power and Signal Layers Placement on the PCB .................. 22
Component Placement.............................................................. 22
Signal Ground and Power Ground Connection....................... 22
GND and VCC Pin........................................................................ 22
LGATE Pin .................................................................................... 22
PGND Pin ..................................................................................... 22
PHASE Pin ................................................................................... 22
UGATE Pin.................................................................................... 22
BOOT Pin...................................................................................... 23
CSOP, CSON, CSSP and CSSN 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
February 8, 2011
FN6978.2