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Advanced Multi-Chem & Multi-Cell Sync Switch-Mode Charger & Sys Power Selector
Texas Instruments
Description
The bq24730 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 hardware 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 input current sense amplifier can be enabled with no adapter to sense battery discharge current. 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.
Features
High Efficiency: NMOS-NMOS Synchronous Buck Converter With Fixed 300 kHz Frequency Enhanced 6-V Drive Supply Voltage and 99.5% Max Duty Cycle High Voltage and Current Regulation Accuracy (0°C-85°C): 0.4% Charge Voltage Regulation Accuracy 4% Charge Current Regulation Accuracy 4% Adapter Current Regulation Accuracy Dynamic Power Management (DPM) 3-Cell or 4-Cell Li-Ion Battery Voltage Select Programmable Battery Charge Current, and AC Adapter Current via Resistor 2% Accurate Current Sense Amplifiers for Both Input Current and Charge Current (0°C-125°C) Input Current Sense Amplifier Can Be Enabled with No Adapter to Sense Battery Discharge CurrentRegulates Charge Current Down to 0-V Battery Voltage AC Adapter Operating Range 8 V-24 V Internal Soft Start Status Indicators:AC Adapter Present Low Battery IndicatorDPM Regulation Loop Active Indicator Reverse Battery to Adapter Discharge Protection Battery/Adapter to System Power Selector Function Charge Overcurrent Protection Available in 40-Pin 5x7mm QFN Package APPLICATIONS Portable Notebook Computers Portable DVD Players Webpads, PC Tablets PowerPAD is a trademark of Texas Instruments.
Related Datasheets
| Part Number | Description | Category |
| • BQ24103A | Synchronous Switchmode, Li-Ion & Li-Pol Charge Mngmt IC (bqSwitcher) (Rev. L) | ICs, Interface |
| • BQ24125 | Single-Chip Switchmode, Li-Ion & Li-Polymer Charge Mgmt IC w/enhanced EMI Perf (Rev. E) | ICs, Interface |
| • BQ24702 | Multichemistry Battery Charger Controller & System Power Selector (Rev. E) | ICs, Interface |
| • BQ24703 | Multichemistry Battery Charger Controller & System Power Selector (Rev. E) | ICs, Interface |
| • BQ24705 | Host-Controlled Multi-Chemistry Battery Charger With Low Input Power Detect | ICs, Interface |
| • BQ24721C | Adv Multi-Chemistry & Mutli-Cell Sync Switch-Mode Charger & Syst Power Selector (Rev. D) | ICs, Interface |
| • BQ24740 | Host-controlled Multi-chemistry Battery Charger with Low Input Power Detect (Rev. A) | ICs, Interface |
| • BQ24745 | SMBus-Controlled Level 2 Multi-chemistry Battery Charger With Input Current | ICs, Interface |
| • BQ24750 | Host-controlled Multi-chemistry Battery Charger w/Integrated Sys Power Selector (Rev. B) | ICs, Interface |
| • BQ24751A | Host-controlled Multi-chemistry Battery Charger w/Sys Power Selector (Rev. A) | ICs, Interface |
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