Maker : Texas Instruments
Part No. : BQ24620

  Datasheet PDF : BQ24620.pdf
  Cross Reference : BQ24620 Cross Reference
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Shortcut : BQ24620 

Product Information

www.DataSheet4U.com bq24620 www.ti.com SLUS893 – MARCH 2010 Stand-Alone Synchronous Switch-Mode Lithium Phosphate Battery Charger with Low Iq Check for Samples: bq24620 1 FEATURES 300 kHz NMOS-NMOS Synchronous Buck Converter Stand-alone Charger Designed Specifically for Lithium Phosphate 5V–28V VCC Operating Range, Support 1-7 Battery Cells High-Accuracy Voltage and Current Regulation – ±0.5% Charge Voltage Accuracy – ±3% Charge Current Accuracy Integration – Internal Loop Compensation – Internal Soft Start Safety – Input Over-Voltage Protection – Battery Thermistor Sense Suspend Charge at Hot/Cold Charge Suspend and Automatically ICHARGE/8 at WARM/COOL – Battery Detection – Built-in Safety Timer – Charge Over-Current Protection – Battery Short Protection – Battery Over-Voltage Protection – Thermal Shutdown Status Outputs – Adapter Present – Charger Operation Status Charge Enable Pin 6V Gate Drive for Synchronous Buck Converter 30ns Driver Dead-time and 99.95% Max Effective Duty Cycle 16-Pin 3.5×3.5-mm QFN Package Energy Star Low Iq – < 15 mA Off-State Battery Discharge Current – < 1.5 mA Off-State Input Quiescent Current APPLICATIONS • • • • • Power Tool and Portable Equipment Personal Digital Assistants Handheld Terminals Industrial and Medical Equipment Netbook, Mobile Internet Device and Ultra-Mobile PC • • • • DESCRIPTION The bq24620 is highly integrated switch-mode battery charge controller designed specifically for Lithium Phosphate battery. It offers a constant-frequency synchronous PWM controller with high accuracy current and voltage regulation, charge preconditioning, termination, and charge status monitoring. The bq24620 charges the battery in three phases: preconditioning, constant current, and constant voltage. Charge is terminated when the current reaches a minimum level. An internal charge timer provides a safety backup. The bq24620 automatically restarts the charge cycle if the battery voltage falls below an internal threshold, and enters a low-quiescent current sleep mode when the input voltage falls below the battery voltage. PACKAGE • • 16 15 14 PH • 13 • • • • • LODRV 12 REGN 11 GND 10 SRP VCC 1 2 CE OAR (bq24620) QFN-16 TOP VIEW STAT 3 TS 4 HIDRV BTST 9 SRN 5 6 7 8 VREF 1 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. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2010, Texas Instruments Incorporated ISET VFB PG bq24620 www.DataSheet4U.com SLUS893 – MARCH 2010 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. TYPICAL APPLICATION ADAPTER + ADAPTER R11 2W C2 2.2 µF D2 MBRS540T3 R6 10 W C8 10 µF C9 10 µF Q4 SiR426 L1 D1 BAT54 C5 1 µF C6 0.1 µF 8.2 µH* RSR 0.010 VREF C7 1 µF R7 100 kW PH ISET BTST REGN R8 22.1 kW C4 1 µF R13 10 kW D3 VREF CE STAT ADAPTER + R14 10 kW GND D4 PG VREF Pack Thermistor Sense R9 9.31 kW R5 100 W SRP SRN TS R10 430 kW 0.1 F VFB PwrPad NOTE: VIN=28V, BAT=5-cell Li-Phosphate, Icharge=3A, Ipre-charge=0.125A, Iterm=0.3A Figure 1. Typical System Schematic ORDERING INFORMATION PART NUMBER bq24620 IC MARKING OAR PACKAGE 16-Pin 3.5×3.5 mm QFN ORDERING...

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