Battery Charge IC suits multi-cell portable electronics.
Press Release Summary:
Interfacing to system's host controller through SMBus communications interface, Model bq24721 offers 0.4% accuracy on charge voltage regulation and 2% accuracy on current amplifier outputs. Using synchronous NMOS-NMOS rectifier, device can achieve power efficiencies up to 94%. Power selector function automatically selects ac adaptor or battery to properly manage system load. Dynamic power management function controls charge current depending on system load conditions.
Original Press Release:
TI Introduces SMBus Battery Charge IC for Notebooks and Multi-Cell Portable Electronics
High Efficiency, High Accuracy Charger with System Power Selector
DALLAS (December 21, 2005) - Texas Instruments Incorporated (TI) (NYSE: TXN) today announced its first integrated battery charge controller with a System Management Bus (SMBus) interface aimed at multi-cell, multi-chemistry battery packs used in portable applications. See: www.ti.com/sc05270.
TI's highly accurate and power efficient bq24721 charge management device easily interfaces to a system's host controller through an SMBus communications interface. The charger offers 0.4 percent accuracy on charge voltage regulation and two percent accuracy on current amplifier outputs. Using a synchronous NMOS-NMOS rectifier, the easy-to-design device can achieve power efficiencies up to 94 percent.
The bq24721 integrates several high-performance features, including the system power selector function, which automatically selects the AC adaptor or the battery to properly manage the system load. The device's dynamic power management (DPM) function controls the charge current depending on system load conditions, avoiding AC adaptor overload. In addition, high accuracy current sense amplifiers enable accurate measurement of either the charge current or the AC adaptor current, allowing termination of the "non-smart" packs and monitoring of overall system power.
Key Features of the bq24721:
o High-Efficiency NMOS-NMOS Synchronous DC/DC Buck Converter with User-Selectable 300 kHz or 500 kHz Frequency
o Programmable Battery Voltage, Charge Current and AC Adaptor Current via SMBus
o Highly Accurate Charge Management: 0.4 Percent Charge Voltage Accuracy, 3 Percent Charge Current Regulation Accuracy and 3 Percent Adaptor Current Regulation Accuracy
o Two Percent Accuracy Integrated Charge and AC Adaptor 20x Current Amplifier Output
o Autonomous Power Source Selector and Dynamic Power Management
o Battery Pack Voltage Range 0 V to 19.2 V for Three- to Four-cell Li-Ion Series Cells
o AC Adaptor Operating Range 8 V to 28 V
o Charger Soft Start, Charge Over-current Protection and IC Temperature Monitoring
Available Today
The bq24721 is available now from TI and its authorized distributors. The battery charge management IC comes in a 32-pin, 5 mm x 5 mm QFN package, and suggested retail pricing is $4.90 in 1,000 piece quantities. Evaluation modules of the bq24721, application notes and TI's comprehensive portfolio of battery management ICs are available through power.ti.com/battman.
Texas Instruments Incorporated provides innovative DSP and analog technologies to meet our customers' real world signal processing requirements. In addition to Semiconductor, the company's businesses include Sensors & Controls, and Educational & Productivity Solutions. TI is headquartered in Dallas, Texas, and has manufacturing, design or sales operations in more than 25 countries.
Texas Instruments is traded on the New York Stock Exchange under the symbol TXN. More information is located on the World Wide Web at www.ti.com.
