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bq24707 Dataheets PDF



Part Number bq24707
Manufacturers Texas Instruments
Logo Texas Instruments
Description 1-4 Cell Li+ Battery SMBus Charge Controller
Datasheet bq24707 Datasheetbq24707 Datasheet (PDF)

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design bq24707, bq24707A SLUSA78C – JULY 2010 – REVISED JULY 2015 bq24707x 1-4 Cell Li+ Battery SMBus Charge Controller With Independent Comparator and Advanced Circuit Protection 1 Features •1 SMBus Host-Controlled NMOS-NMOS Synchronous Buck Converter With Programmable 615 kHz, 750 kHz, and 885 kHz Switching Frequency • Real-Time System Control on ILIM Pin to Limit Charge Current • Enhanced Saf.

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Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design bq24707, bq24707A SLUSA78C – JULY 2010 – REVISED JULY 2015 bq24707x 1-4 Cell Li+ Battery SMBus Charge Controller With Independent Comparator and Advanced Circuit Protection 1 Features •1 SMBus Host-Controlled NMOS-NMOS Synchronous Buck Converter With Programmable 615 kHz, 750 kHz, and 885 kHz Switching Frequency • Real-Time System Control on ILIM Pin to Limit Charge Current • Enhanced Safety Features for Overvoltage Protection, Overcurrent Protection, Battery, Inductor, and MOSFET Short-Circuit Protection • Programmable Input Current, Charge Voltage, Charge Current Limits – ±0.5% Charge Voltage Accuracy up to 19.2 V – ±3% Charge Current Accuracy up to 8.128 A – ±3% Input Current Accuracy up to 8.064 A – ±2% 20× Adapter Current or Charge Current Output Accuracy • Programmable Adapter Detection and Indicator • Independent Comparator With Internal Reference • Integrated Soft-Start • Integrated Loop Compensation • AC Adapter Operating Range 5 V to 24 V • 15-µA Off-State Battery Discharge Current • 20-pin 3.5 mm × 3.5 mm QFN Package • bq24707: ACOK Delay Default 1.3 s • bq24707A: ACOK Delay Default 1.2 ms 3 Description The bq24707 and bq24707A devices are highefficiency, synchronous battery chargers, offering low component count for space-constrained, multichemistry battery charging applications. SMBus controlled input current, charge current, and charge voltage DACs allow for very high regulation accuracies that can be easily programmed by the system power management micro-controller. The IC uses the internal input current register or external ILIM pin to throttle down PWM modulation to reduce the charge current. The IC provides an IFAULT output to alarm if any MOSFET fault or input over current occurs. This alarm output allows users to turn off input power selectors when the fault occurs. Meanwhile, an independent comparator with internal reference is available to monitor input current, output current, or output voltage. The IC charges one-, two-, three-, or four-series Li+ cells, and is available in a 20-pin, 3.5 × 3.5 mm QFN package. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) bq24707 bq24707A VQFN (20) 3.50 mm × 3.50 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. 2 Applications • Portable Notebook Computers, UMPCs, Ultra-Thin Notebooks, and Netbooks • Personal Digital Assistants • Handheld Terminals • Industrial and Medical Equipment • Portable Equipment Adapter P 4.5-24 V Q1 Simplified Schematic Enhanced Safety: OCP, OVP,FET Short P RAC Q2 SYS Adapter Detection bq2707x SMBus Controls V & I with high accuracy SMBus HOST Charge Controller Battery Pack RSR 1S-4S Integration: Loop Compensation; Soft-Start Comparator 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. bq24707, bq24707A SLUSA78C – JULY 2010 – REVISED JULY 2015 www.ti.com Table of Contents 1 Features .................................................................. 1 2 Applications ........................................................... 1 3 Description ............................................................. 1 4 Revision History..................................................... 2 5 Device Comparison Table..................................... 3 6 Pin Configuration and Functions ......................... 3 7 Specifications......................................................... 5 7.1 Absolute Maximum Ratings ...................................... 5 7.2 ESD Ratings.............................................................. 5 7.3 Recommended Operating Conditions....................... 5 7.4 Thermal Information .................................................. 5 7.5 Electrical Characteristics........................................... 6 7.6 Timing Requirements .............................................. 10 7.7 Typical Characteristics ............................................ 11 8 Detailed Description ............................................ 14 8.1 Overview ................................................................. 14 8.2 Functional Block Diagram ....................................... 15 8.3 Feature Description................................................. 16 8.4 Device Functional Modes........................................ 17 8.5 Programming........................................................... 18 9 Application and Implementation ........................ 26 9.1 Application Information............................................ 26 9.2 Typical Application ................................................. 26 10 Power Supply Recommendations ..................... 31 11 Layout..............................


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