Stand-Alone USB-Friendly Synchronous Switch-Mode Li-Ion or Li-Polymer Battery Charger  - BQ24618

BQ24618 (ACTIVE)

Stand-Alone USB-Friendly Synchronous Switch-Mode Li-Ion or Li-Polymer Battery Charger

 

Description

The bq24618 device is highly integrated Li-ion or Li-polymer switched-mode battery-charge controller. The bq24618 offers a constant-frequency synchronous switching PWM controller with high-accuracy charge current and voltage regulation, charge preconditioning, termination, adapter current regulation and charge status monitoring.

The bq24618 operates from either a USB port or AC adapter and supports charge currents up to 10 A. The device charges the battery in three phases: preconditioning, constant current, and constant voltage. Charge is terminated when the current reaches a minimum user-selectable level. A programmable charge timer provides a safety backup for charge termination. The bq24618 automatically restarts the charge cycle if the battery voltage falls below an internal threshold, and enters a low-quiescent current sleep mode when the input voltage falls below the battery voltage.

Features

  • USB-Friendly 4.7-V to 28-V Input Operating
    Range
  • Stand-Alone Charge Controller to Support 1 to 6
    Li-Ion or Li-Polymer Battery Cells
  • Up to 10-A Charge Current and Adapter Current
  • 600-kHz NMOS-NMOS Synchronous Buck
    Converter
  • High-Accuracy Voltage and Current Regulation
    • ±0.5% Charge Voltage Accuracy
    • ±3% Charge Current Accuracy
    • ±3% Adapter Current Accuracy
  • Integration
    • Automatic System Power Selection From
      Adapter or Battery
    • Internal Loop Compensation
    • Internal Soft Start
    • Dynamic Power Management
  • Safety Protection
    • Input Overvoltage Protection
    • Battery Thermistor Sense Hot/Cold Charge
      Suspend
    • Battery Detection
    • Reverse-Protection Input FET
    • Programmable Safety Timer
    • Charge Overcurrent Protection
    • Battery Short Protection
    • Battery Overvoltage Protection
    • Thermal Shutdown
  • Status Outputs
    • Adapter Present
    • Charger Operation Status
  • Charge Enable Pin
  • 6-V Gate Drive for Synchronous Buck Converter
  • 30-ns Driver Dead-Time and 99.5% Maximum
    Effective Duty Cycle
  • Energy Star Low Quiescent Current Iq
    • < 15-µA Off-State Battery Discharge Current
    • < 1.5-mA Off-State Input Quiescent Current
  • APPLICATIONS
    • Tablet PCs
    • Smart Phones
    • Portable Media Players, Navigation Devices,
      Notebooks and Ultra-Mobile PCs
    • Personal Digital Assistants
    • Handheld Terminals
    • Industrial and Medical Equipment

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Parametrics Compare all products in Battery Charger IC

 
Number of Series Cells
Function
Cell Chemistry
Battery Charge Voltage (Min) (V)
Battery Charge Voltage (Max) (V)
Features
Charge Current (Max) (A)
Control Interface
Control Topology
Rating
Operating Temperature Range (C)
Pin/Package
Operating Vin (Min) (V)
Operating Vin (Max) (V)
Absolute Vin (safety rating) (Max) ((V))
BQ24618 BQ24600 BQ24610 BQ24616 BQ24617 BQ24620 BQ24630 BQ24640
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5
6   
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2
3
4
5
6   
1
2
3
4
5   
1
2
3
4
5
6
7   
1
2
3
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1
2
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Charger    Charger    Charger    Charger    Charger    Charger    Charger    Charger   
Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Lithium phosphate    Lithium phosphate    SuperCap   
2.1    2.1    2.1    2.1    2.1    1.8    1.8    2.1   
26    26    26    26    22    26    26    26   
Power Path
Standard BAT Temp Monitoring   
Power Path
Temp Monitoring (Thermistor Pin)   
Power Path
Standard BAT Temp Monitoring   
JEITA BAT Temp Monitoring (Thermistor Pin)
Power Path   
Power Path
Standard BAT Temp Monitoring   
Temp Monitoring (Thermistor Pin)    Temp Monitoring (Thermistor Pin)    Temp Monitoring (Thermistor Pin)   
10    10    10    10    10    10    10    10   
Standalone (RC-Settable)    Standalone (RC-Settable)    Standalone (RC-Settable)    Standalone (RC-Settable)    Standalone (RC-Settable)    Standalone (RC-Settable)    Standalone (RC-Settable)    Standalone (RC-Settable)   
Switch-Mode Buck    Switch-Mode Buck    Switch-Mode Buck    Switch-Mode Buck    Switch-Mode Buck    Switch-Mode Buck    Switch-Mode Buck    Switch-Mode Buck   
Catalog    Catalog    Catalog    Catalog    Catalog    Catalog    Catalog    Catalog   
-40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85   
24VQFN    16VQFN    24VQFN    24VQFN    24VQFN    16VQFN    24VQFN    16VQFN   
4.7    5    5    5    5    5    5    5   
28    28    28    28    24    28    28    28   
33    33    33    33    33    33    33    33