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BQ24721CRHBR Datasheet(PDF) 1 Page - Texas Instruments |
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BQ24721CRHBR Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 60 page  www.ti.com FEATURES APPLICATIONS DESCRIPTION 1 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17 bq24721, bq24721C CHGEN ACDRV ACN ACP ACDET BYPASS EAO EAI IOUT BAT SRN SRP SYNN SYNP SYS BATDRV 5x5QFNPACKAGE(TOP VIEW) bq24721, bq24721C SLUS683C – NOVEMBER 2005 – REVISED DECEMBER 2006 ADVANCED MULTI-CHEMISTRY AND MULTI-CELL SYNCHRONOUS SWITCH-MODE CHARGER AND SYSTEM POWER SELECTOR • Portable Notebook Computers • High Efficiency NMOS-NMOS Synchronous Buck Converter With User-Selectable 300 kHz • Portable DVD Players or 500 kHz frequency • Webpads, PC Tablets • bq24721C Offers Softer Turn-On, Stronger Turn-Off • SBS-Like (1) SMBus Interface for Control and The bq24721 is a high efficiency synchronous Status Communications With Host battery pack charger with high level of integration for portable applications. This device implements a high • Programmable Battery Voltage, Charge performance analog front-end that interfaces to the Current, and AC Adapter Current via SBS-Like system power management micro-controller through SMBus Interface a simplified SBS-like SMBus interface. • 0.4% Charge Voltage Regulation Accuracy The dynamic power management (DPM) function • 3% Charge Current Regulation Accuracy modifies the charge current depending on system • 3% Adapter Current Regulation Accuracy load conditions, avoiding ac adapter overload. Dynamic Power Management (DPM) High accuracy current sense amplifiers enable • 2% Accuracy Integrated Charge and AC accurate measurement of either the charge current Adapter 20 × Current Amplifier Output or the ac adapter current, allowing termination of nonsmart packs and monitoring of overall system • 3-Cell and 4-Cell Li-Ion Voltage Regulation power. 9 V, 12 V–14.4 V, 16 V–19.2 V • Battery Pack Voltage Operating Range The adapter isolation diode can be bypassed or 0 V–19.2 V entirely replaced with an external MOSFET using a control signal provided by the bq24721, thus • AC Adapter Operating Range 8 V–28 V reducing overall power dissipation. • 99.5% Max Duty Cycle Integrated features such as charger soft start, charge • Internal Soft Start overcurrent protection, and IC temperature • Integrated 5% 5-V LDO When AC Adapter monitoring provide a second level of protection, in Applied addition to pack and system protection functions. • 6-V Drive Supply Voltage for Increased Efficiency • Reverse Battery to Adapter Discharge Protection • Battery/Adapter to System Power Selector Function • Charge and Adapter Overcurrent Protection • Battery Thermistor Sense, TS, Comparators • Available in 32-Pin 5x5-mm QFN Package (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. See Table 1 for a comparison between SBS-like vs SBS Specification. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PowerPAD is a trademark of Texas Instruments. PRODUCTION DATA information is current as of publication date. Copyright © 2005–2006, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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