| Parameters | 
                                
                                                                                                            
                                            | Mounting Type | 
                                            Surface Mount | 
                                        
                                                                            
                                            | Package / Case | 
                                            28-VFQFN Exposed Pad | 
                                        
                                                                            
                                            | Surface Mount | 
                                            YES | 
                                        
                                                                            
                                            | Operating Temperature | 
                                            -10°C~100°C TA | 
                                        
                                                                            
                                            | Packaging | 
                                            Tape & Reel (TR) | 
                                        
                                                                            
                                            | JESD-609 Code | 
                                            e3 | 
                                        
                                                                            
                                            | Part Status | 
                                            Obsolete | 
                                        
                                                                            
                                            | Moisture Sensitivity Level (MSL) | 
                                            3 (168 Hours) | 
                                        
                                                                            
                                            | Number of Terminations | 
                                            28 | 
                                        
                                                                            
                                            | Terminal Finish | 
                                            Matte Tin (Sn) | 
                                        
                                                                            
                                            | Terminal Position | 
                                            QUAD | 
                                        
                                                                            
                                            | Terminal Form | 
                                            NO LEAD | 
                                        
                                                                            
                                            | Peak Reflow Temperature (Cel) | 
                                            NOT SPECIFIED | 
                                        
                                                                            
                                            | Number of Functions | 
                                            1 | 
                                        
                                                                            
                                            | Supply Voltage | 
                                            18V | 
                                        
                                                                            
                                            | Terminal Pitch | 
                                            0.5mm | 
                                        
                                                                            
                                            | Time@Peak Reflow Temperature-Max (s) | 
                                            NOT SPECIFIED | 
                                        
                                                                            
                                            | Base Part Number | 
                                            ISL6257 | 
                                        
                                                                            
                                            | JESD-30 Code | 
                                            S-PQCC-N28 | 
                                        
                                                                            
                                            | Number of Channels | 
                                            2 | 
                                        
                                                                            
                                            | Analog IC - Other Type | 
                                            POWER SUPPLY SUPPORT CIRCUIT | 
                                        
                                                                            
                                            | Adjustable Threshold | 
                                            YES | 
                                        
                                                                            
                                            | Fault Protection | 
                                            Over Temperature, Short Circuit | 
                                        
                                                                            
                                            | Battery Chemistry | 
                                            Lithium Ion/Polymer | 
                                        
                                                                            
                                            | Number of Cells | 
                                            2 ~ 4 | 
                                        
                                                                            
                                            | Voltage - Supply (Max) | 
                                            25V | 
                                        
                                                                            
                                            | Current - Charging | 
                                            Constant - Programmable | 
                                        
                                                                            
                                            | Battery Pack Voltage | 
                                            17.64V Max | 
                                        
                                                                            
                                            | Height Seated (Max) | 
                                            1mm | 
                                        
                                                                            
                                            | Length | 
                                            5mm | 
                                        
                                                                            
                                            | Width | 
                                            5mm | 
                                        
                                                                            
                                            | RoHS Status | 
                                            ROHS3 Compliant | 
                                        
                                                                                                    
                            
                         
                                                ISL6257HRZ-T Overview
I found it in the Tape & Reel (TR) package, which comes with everything you need.The 28-VFQFN Exposed Pad package includes it as a convenience.In this case, the device has a mounting type of Surface Mount.It is best to set the temperature to -10°C~100°C TA.The device relies on an analog IC called POWER SUPPLY SUPPORT CIRCUIT to operate.In order to charge the device, it needs to receive Constant - Programmable current.The base part number ISL6257 can be used to locate related parts for this device.It is possible to find a total of 28 terminations.It is 17.64V Max for the battery pack.It appears that there are 2 channels available at this time.Devices require 25V as their maximum supply voltage.Using a 18V battery should be enough to run it.
ISL6257HRZ-T Features
Battery pack voltage of 17.64V Max
2 channels
28-VFQFN Exposed Pad package
ISL6257HRZ-T Applications
There are a lot of Renesas Electronics America Inc. ISL6257HRZ-T Battery Chargers ICs applications. 
- Ruggedized notebooks/tablet computers
 - Personnel carriers
 - Smart cameras
 - Industrial lighting
 - Truck dealers
 - Forklift
 - Medical
 - Digital camera
 - Wearables
 - Electric vehicles