BQ24079

Part: bq24072/3/4/5/9(T) and bq24230/2 — Texas Instruments

Type: Li-Ion and Li-Polymer Charge Management IC

Description: 1.5-A single-chip Li-Ion and Li-Polymer charge management IC designed to power the system while independently charging the battery, supporting adapter or USB power sources.

Operating Conditions:

• Input dc Voltage: 4.75–6.5 V
• Operating temperature: -40 to +125 °C (junction temperature, thermal regulation)

Absolute Maximum Ratings:

• Max supply voltage: 28 V
• Max continuous current: 1.5 A (Battery Charge Current, I O(CHG))
• Max junction/storage temperature: 155 °C (thermal cutoff)

Key Specs:

• Battery Charge Current (I O(CHG)): 1 A (Typ), 1.5 A (Max)
• Input dc Voltage (V I(AC)): 4.75 V (Min), 5 V (Typ), 6.5 V (Max)
• Battery Regulation Voltage (V BAT): 4.2 V (bq24072/3/4/5), 4.1 V (bq24079(T))
• Output Overvoltage Protection (V OVP): 6.6 V (bq24072/3/5/9(T)), 10.5 V (bq24074)
• Output Regulation Voltage (V OUT(REG)): V BAT + 200 mV (bq24072), 4.4 V (bq24073/4), 5.5 V (bq24075/9(T))
• Dynamic Power-Path Management (V DPM): V O(REG) - 100 mV (bq24072/3/4), 4.3 V (bq24075/9(T))
• USB Input Current Limits: 100 mA, 500 mA

Features:

• Powers system independently while charging battery
• Reduces charge/discharge cycles on battery
• Allows system to run with absent or defective battery pack
• Instantaneous turn-on from external power source with deeply discharged battery
• Programmable input current limits for adapter or USB (100 mA, 500 mA)
• Dynamic adjustment of charge rate based on system load
• Three-phase charging: conditioning, constant current, constant voltage
• Minimum current-based charge termination
• Resistor-programmable charge timer for backup safety
• Automatic charge re-start if battery voltage falls below internal threshold
• Sleep mode when supply is removed
• Thermal regulation and thermal cutoff protection

Applications:

• Portable applications (Li-ion/Li-polymer)
• Headset designs (bq24230/2 family)

Package:

• SOT-23

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2010, Texas Instruments Incorporated