BQ24721C Series
Smart Battery Charger with SMBus and System Power Selector, Softer Turn-On
Manufacturer: Texas Instruments
Link to Manufacturer Page: https://www.ti.com/
Catalog
Smart Battery Charger with SMBus and System Power Selector, Softer Turn-On
| Part | Number of Cells [Max] | Number of Cells [Min] | Battery Chemistry | Package / Case | Operating Temperature [Max] | Operating Temperature [Min] | Voltage - Supply (Max) [Max] | Programmable Features | Supplier Device Package | Fault Protection | Battery Pack Voltage | Interface | Mounting Type |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Texas Instruments BQ24721CRHBR | 4 | 3 | Multi-Chemistry | 32-VFQFN Exposed Pad | 85 °C | -40 °C | 24 V | Current | 32-VQFN (5x5) | Over Current | 19.2 V | I2C | Surface Mount |
Texas Instruments BQ24721CRHBT | 4 | 3 | Multi-Chemistry | 32-VFQFN Exposed Pad | 85 °C | -40 °C | 24 V | Current | 32-VQFN (5x5) | Over Current | 19.2 V | I2C | Surface Mount |
Key Features
• High Efficiency NMOS-NMOS Synchronous Buck Converter With User-Selectable 300 kHz or 500 kHz frequencybq24721C Offers Softer Turn-On, Stronger Turn-OffSBS-Like(1)SMBus Interface for Control and Status Communications With HostProgrammable Battery Voltage, Charge Current, and AC Adapter Current via SBS-Like SMBus Interface0.4% Charge Voltage Regulation Accuracy3% Charge Current Regulation Accuracy3% Adapter Current Regulation Accuracy Dynamic Power Management (DPM)2% Accuracy Integrated Charge and AC Adapter 20× Current Amplifier Output3-Cell and 4-Cell Li-Ion Voltage Regulation 9 V, 12 V-14.4 V, 16 V-19.2 VBattery Pack Voltage Operating Range 0 V-19.2 VAC Adapter Operating Range 8 V-28 V99.5% Max Duty CycleInternal Soft StartIntegrated 5% 5-V LDO When AC Adapter Applied6-V Drive Supply Voltage for Increased EfficiencyReverse Battery to Adapter Discharge ProtectionBattery/Adapter to System Power Selector FunctionCharge and Adapter Overcurrent ProtectionBattery Thermistor Sense, TS, ComparatorsAvailable in 32-Pin 5x5-mm QFN PackageAPPLICATIONSPortable Notebook ComputersPortable DVD PlayersWebpads, PC Tablets(1)SBS-Like interface is not 100% SBS compliant. SBS-Like interface is SMBus1.1 complaint but does not support Packet Error Correction (PEC). The control and status registers were changed to simplify and enhance notebook charger control. An 8-bit address (0x12) is used.PowerPAD is a trademark of Texas Instruments.High Efficiency NMOS-NMOS Synchronous Buck Converter With User-Selectable 300 kHz or 500 kHz frequencybq24721C Offers Softer Turn-On, Stronger Turn-OffSBS-Like(1)SMBus Interface for Control and Status Communications With HostProgrammable Battery Voltage, Charge Current, and AC Adapter Current via SBS-Like SMBus Interface0.4% Charge Voltage Regulation Accuracy3% Charge Current Regulation Accuracy3% Adapter Current Regulation Accuracy Dynamic Power Management (DPM)2% Accuracy Integrated Charge and AC Adapter 20× Current Amplifier Output3-Cell and 4-Cell Li-Ion Voltage Regulation 9 V, 12 V-14.4 V, 16 V-19.2 VBattery Pack Voltage Operating Range 0 V-19.2 VAC Adapter Operating Range 8 V-28 V99.5% Max Duty CycleInternal Soft StartIntegrated 5% 5-V LDO When AC Adapter Applied6-V Drive Supply Voltage for Increased EfficiencyReverse Battery to Adapter Discharge ProtectionBattery/Adapter to System Power Selector FunctionCharge and Adapter Overcurrent ProtectionBattery Thermistor Sense, TS, ComparatorsAvailable in 32-Pin 5x5-mm QFN PackageAPPLICATIONSPortable Notebook ComputersPortable DVD PlayersWebpads, PC Tablets(1)SBS-Like interface is not 100% SBS compliant. SBS-Like interface is SMBus1.1 complaint but does not support Packet Error Correction (PEC). The control and status registers were changed to simplify and enhance notebook charger control. An 8-bit address (0x12) is used.PowerPAD is a trademark of Texas Instruments.
Description
AI
The bq24721 is a high efficiency synchronous battery pack charger with high level of integration for portable applications. This device implements a high performance analog front-end that interfaces to the system power management micro-controller through a simplified SBS-like SMBus interface.
The dynamic power management (DPM) function modifies the charge current depending on system load conditions, avoiding ac adapter overload.
High accuracy current sense amplifiers enable accurate measurement of either the charge current or the ac adapter current, allowing termination of nonsmart packs and monitoring of overall system power.
The adapter isolation diode can be bypassed or entirely replaced with an external MOSFET using a control signal provided by the bq24721, thus reducing overall power dissipation.
Integrated features such as charger soft start, charge overcurrent protection, and IC temperature monitoring provide a second level of protection, in addition to pack and system protection functions.
The bq24721 is a high efficiency synchronous battery pack charger with high level of integration for portable applications. This device implements a high performance analog front-end that interfaces to the system power management micro-controller through a simplified SBS-like SMBus interface.
The dynamic power management (DPM) function modifies the charge current depending on system load conditions, avoiding ac adapter overload.
High accuracy current sense amplifiers enable accurate measurement of either the charge current or the ac adapter current, allowing termination of nonsmart packs and monitoring of overall system power.
The adapter isolation diode can be bypassed or entirely replaced with an external MOSFET using a control signal provided by the bq24721, thus reducing overall power dissipation.
Integrated features such as charger soft start, charge overcurrent protection, and IC temperature monitoring provide a second level of protection, in addition to pack and system protection functions.