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  12348765 SNSLEDBATVSSMODVCCTSRC bq2000 www.ti.com  SLUS138D –JANUARY 2008–REVISED DECEMBER 2009 P rogram m able M ulti-C hem istry Fast-C harge M anagem ent IC Check for Samples: bq2000 1 FEATURESGENERAL DESCRIPTION ã Safe Management of Fast Charge for NiCd,NiMH, or Li-Ion Battery Packs The bq2000 is a programmable, monolithic IC forfast-charge management of nickel cadmium (NiCd), ã High-Frequency Switching Controller for nickel metal-hydride (NiMH), or lithium-ion (Li-Ion) Efficient and Simple Charger Design batteries in single- or multi-chemistry applications. ã Pre-Charge Qualification for Detecting The bq2000 chooses the proper battery chemistry Shorted, Damaged, or Overheated Cells (either nickel or lithium) and proceeds with the ã Fast-Charge Termination by Peak Voltage  optimal charging and termination algorithms. This (PVD) for Nickel chemistries, Minimum Current  process eliminates undesirable, undercharged, orovercharged conditions, and allows accurate and safe for Li-Ion chemistries, Maximum Temperature, termination of fast charge and Maximum Charge Timeã Selectable Top-Off Mode for Achieving  Depending on the chemistry, the bq2000 provides a Maximum Capacity in NiMH Batteries  number of charge termination criteria:ã Peak voltage, PVD (for NiCd and NiMH) ã Programmable Trickle-Charge Mode forReviving Deeply Discharged Batteries and for  ã Minimum charge current (for Li-Ion) Postcharge Maintenance  ã Maximum temperature ã Built-in Battery Removal and Insertion  ã Maximum charge time Detection For safety, the bq2000 inhibits fast charge until the ã Sleep Mode for Low Power Consumption  battery voltage and temperature are withinuser-defined limits. If the battery voltage is below the APPLICATIONS  low-voltage threshold, the bq2000 uses trickle-chargeto condition the battery. For NiMH batteries, the ã Multi-Chemistry Charger bq2000 provides an optional top-off charge to ã Nickel Charger maximize the battery capacity. ã High-Power, Multi-Cell Charger The integrated high-speed comparator allows thebq2000 to be the basis for a complete, high-efficiencybattery charger circuit for both nickel-based andlithium-based chemistries.spacer between para and illustration 8-Pin DIP or Narrow SOIC or TSSOP Pin Names SNS Current-sense inputV SS  System groundLED Charge-status outputBAT Battery-voltage inputTS Temperature-sense inputRC Timer-program inputV CC  Supply-voltage inputMOD Modulation-control output 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of TexasInstruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Copyright © 2008–2009, Texas Instruments Incorporated Products conform to specifications per the terms of the TexasInstruments standard warranty. Production processing does notnecessarily include testing of all parameters.  bq2000 SLUS138D –JANUARY 2008–REVISED DECEMBER 2009  www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foamduring storage or handling to prevent electrostatic damage to the MOS gates. PIN DESCRIPTIONS SNS Current-sense input Enables the bq2000 to sense the battery current via the voltage developed on this pin by an externalsense-resistor connected in series with the battery pack V SS  System Ground Connect to the battery’s negative terminal LED Charge-status output Open-drain output that indicates the charging status by turning on, turning off, or flashing an externalLED, driven through a resistor. BAT Battery-voltage input Battery-voltage sense input. A simple resistive divider, across the battery terminals, generates thisinput. TS Temperature-sense input Input for an external battery-temperature monitoring circuit. An external resistive divider network witha negative temperature-coefficient thermistor sets the lower and upper temperature thresholds. RC Timer-program input Used to program the maximum fast charge-time, maximum top-off charge-time, hold-off period, tricklecharge rate, and to disable or enable top-off charge. A capcitor from V CC  and a resistor to groundconnect to this pin. V CC  Supply-voltage input Recommended bypassing is 10µF + 0.1µF to 0.22µF of decoupling capacitance near the pin. MOD Modulation-control output Push-pull output that controls the charging current to the battery. MOD switches high to enablecharging current to flow and low to inhibit charging-current flow. 2  Submit Documentation Feedback   Copyright © 2008–2009, Texas Instruments Incorporated Product Folder Link(s):  bq2000   VoltageReferenceInternalOSCClockPhaseGenerator  ADCOSCSNSTSMODRCBATLEDV CC  V SS Timer PVD ALUVoltageComparators 3xVoltageComparatorsChargeControl bq2000 www.ti.com  SLUS138D –JANUARY 2008–REVISED DECEMBER 2009 FUNCTIONAL DESCRIPTION The bq2000 is a versatile, multi-chemistry battery charge control device. See Figure 1 for a functional blockdiagram and Figure 2 for a state diagram. Figure 1. Functional Block Diagram Copyright © 2008–2009, Texas Instruments Incorporated  Submit Documentation Feedback   3Product Folder Link(s):  bq2000   4.0 V < V < 6.0 V CC ChargeInitializationBattery Voltage (Voltage at BAT pinchecked continuously. PVD checkedat rate of MTO/128.)SleepModeV < V BAT SLP V < MCV  V < V BAT SLP ChargeQualificationState V < V BAT MCV Battery Temperature(Temperature at TS pin checkedcontinuously)V Resetor Battery Replacement at any time CC ChargeSuspendedV > V TS HTF V < V TS HTF BatteryConditioningCurrentRegulationV < V BAT LBAT  or V > V TS LTF V < V TS HTF V > V TS LTF V VV < V LBAT BATHTF TS LTF < and< VV < V < V andV < V < V LBAT BAT MCVHTF TS LTF PVD (after hold-off period),or V < V or Time = MTO TS TCO VoltageRegulationV > V TS LTF Top-Off Selected?TrickleMaintenanceChargeNOYESTop-Off V > V TS LTF V < V TS LTF  andTime < MTOTime = MTODoneV V BAT MCV ≥ V V BAT MCV ≥ ChargeSuspended(See Note)V < V TS HTF V > V TS HTF and Time < MTOV < V TS HTF V > V TS HTF V Reset or Battery Replacement or Capacity Depletion (Li-lon) CC Current Taper (I < I ).or Time = 2 x MTO or V < V BAT minTS TCO Time < MTOandV V BAT MCV reaches FastCharge State V < SLP  V < V BAT CC bq2000 SLUS138D –JANUARY 2008–REVISED DECEMBER 2009  www.ti.com NOTE: If V TS  < V TCO  at any time, may only return to Trickle Maintenance Charge state and not to Top-Off. Figure 2. State Diagram 4  Submit Documentation Feedback   Copyright © 2008–2009, Texas Instruments Incorporated Product Folder Link(s):  bq2000 

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Jul 12, 2019
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