Dual Input Li-Ion Charger with Dynamic Power Path, Output regulated to 4.4V, Vbat 4.2V - BQ24032A

BQ24032A (ACTIVE)

Dual Input Li-Ion Charger with Dynamic Power Path, Output regulated to 4.4V, Vbat 4.2V

Description

The bqTINY™ III-series of devices are highly integrated Li-ion linear chargers and system power-path management devices targeted at space-limited portable applications. The bqTINY III-series offer integrated USB-port and DC supply (AC adapter), power-path management with autonomous power-source selection, power FETs and current sensors, high accuracy current and voltage regulation, charge status, and charge termination, in a single monolithic device.

The bqTINY III-series powers the system while independently charging the battery. This feature reduces the charge and discharge cycles on the battery, allows for proper charge termination and allows the system to run with an absent or defective battery pack. This feature also allows for the system to instantaneously turn on from an external power source in the case of a deeply discharged battery pack. The IC design is focused on supplying continuous power to the system when available from the AC, USB, or battery sources.

The power select pin, PSEL, defines which input source is to be used first (primary source – AC or USB). If the primary source is not available, then the IC automatically switches over to the other secondary source if available or the battery as the last option. If the PSEL is set low, the USB input is selected first and if not available, the AC line is selected (if available) but programmed to a USB input limiting rate (100 mA/500 mA max). This feature allows the use of one input connector, where the host programs the PSEL pin according to what source is connected (AC adaptor or USB port).

The bq24038 replaces USBPG with pin VBSEL, to enable user selection of the charge voltage. In addition, pin ACPG was modified to PG. PG is active low when either ac power or USB power is detected.

The ISET1 pin programs the battery’s fast charge constant current level with a resistor. During normal AC operation, the input supply provides power to both the OUT (System) and BAT pins. For peak or excessive loads (typically when operating from the USB power, PSEL = Low) that would cause the input source to enter current limit (or Q3 - USB FET limiting current) and its source and system voltage (OUT pin) to drop, the dynamic power-path management (DPPM) feature reduces the charging current attempting to prevent any further drop in system voltage. This feature allows the selection of a lower current rated adaptor based on the average load (ISYS-AVG + IBAT-PGM ) rather than a high peak transient load.

Features

  • Small 3,5 mm × 4,5 mm QFN Package
  • Designed for Single-Cell Li-Ion- or Li-Polymer-Based Portable Applications
  • Integrated Dynamic Power-Path Management (DPPM) Feature Allowing the AC Adapter
    or the USB Port to Simultaneously Power the System and Charge the Battery
  • Power Supplement Mode Allows Battery to Supplement the USB or AC Input Current
  • Autonomous Power Source Selection (AC Adapter or USB)
  • Integrated USB Charge Control With Selectable 100-mA and 500-mA Maximum Input
    Current Regulation Limits
  • Dynamic Total Current Management for USB
  • Supports Up to 2-A Total Current
  • 3.3-V Integrated LDO Output
  • Thermal Regulation for Charge Control
  • Charge Status Outputs for LED or System Interface Indicates Charge and
    Fault Conditions
  • Reverse Current, Short-Circuit, and Thermal Protection
  • Power Good (AC Adapter and USB Port Present) Status Outputs
  • Charge Voltage Options: 4.1V, 4.2V, or 4.36V
  • APPLICATIONS
    • Smart Phones and PDA
    • MP3 Players
    • Digital Cameras Handheld Devices
    • Internet Appliances

bqTINY is a trademark of Texas Instruments.

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Parametrics Compare all products in Battery Chargers and Front-End Solutions

 
Function
Cell Chemistry
# Series Cells
Vin (Max) (V)
Special Features
Battery Charge Voltage (V)
Charge Current (Max) (A)
Control Topology
Control Interface
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
BQ24032A BQ24030 BQ24031 BQ24035 BQ24038
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    
Single Cell     Single Cell     Single Cell     Single Cell     Single Cell    
16     16     16     16     16    
Power Path
Temp Monitoring    
Power Path
Temp Monitoring    
Power Path
Temp Monitoring    
Power Path
Temp Monitoring    
Power Path
Temp Monitoring    
4.2     4.2     4.1     4.2     4.3    
1.5     1.5     1.5     1.5     1.5    
Linear     Linear     Linear     Linear     Linear    
Standalone     Standalone     Standalone     Standalone     Standalone    
Catalog     Catalog     Catalog     Catalog     Catalog    
-40 to 85     -40 to 85     -40 to 125     -40 to 85     -40 to 85    
20VQFN     20VQFN     20VQFN     20VQFN     20VQFN    
1.80 | 1ku     1.80 | 1ku     1.80 | 1ku     1.80 | 1ku     1.80 | 1ku    

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