Details, datasheet, quote on part number: BQ2054
PartBQ2054
CategorySemiconductors => Power Management => Battery Management Products => Battery Charger IC
Part familyBQ2054 Switch-mode Li-Ion Battery Charger in PDIP or SOIC Package
TitlePower
DescriptionSwitch-mode Li-Ion Battery Charger in PDIP or SOIC Package 16-PDIP -20 to 70
CompanyTexas Instruments, Inc.
StatusACTIVE
ROHSY
SampleYes
DatasheetDownload BQ2054 datasheet
Cross ref.Similar parts: MAX1259CPE+, MAX1259EPE+, MAX1259MJE+, LTC1558CS-5, LTC1559CS-5, AIC1781ACNTB, MAX2003ACPE, MAX2003ACSE, MAX2003CPE, MAX2003CSE
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Specifications 
Absolute Vin (safety rating)(Max)((V))7
Cell ChemistryLi-Ion/Li-Polymer
Approx. Price (US$)3.05 | 1ku
Battery Charge Voltage(Min)(V)0
Control InterfaceStandalone (RC-Settable)
FeaturesTemp Monitoring (Thermistor Pin)
Battery Charge Voltage(Max)(V)20
Operating Vin(Min)(V)4.5
Control TopologySwitch-Mode Buck
Package GroupPDIP,SOIC
Charge Current(Max)(A)2
Operating Vin(Max)(V)5.5
Number of Series Cells2,3,4
  Mecanical Data
Pin nbPackage typeInd stdJEDEC codePackage qtyCarrierDevice markWidth (mm)Length (mm)Thick (mm)Pitch (mm)
16NPDIPR-PDIP-T25TUBE2054PN-G 6.3519.33.92.54

 

Features, Applications
Features

Safe charge of Lithium Ion battery packs Voltage-regulated currentlimited charging Fast charge terminated by selectable minimum current; safety backup termination on maximum time Charging continuously qualified by temperature and voltage limits Pulse-width modulation control ideal for high-efficiency switchmode power conversion Direct LED control outputs display charge status and fault conditions

The bq2054 Lithium Ion FastCharge IC is designed to optimize charging of lithium ion (Li-Ion) chemistry batteries. A flexible pulse-width modulation regulator allows the bq2054 to control voltage and current during charging. The regulator frequency is set by an external capacitor for design flexibility. The switch-mode design keeps power dissipation to a minimum. The bq2054 measures battery temperature using an external thermistor for charge qualification. Charging begins when power is applied or on battery insertion. For safety, the bq2054 inhibits charging until the battery voltage and temperature are within con-

figured limits. If the battery voltage is less than the low-voltage threshold, the bq2054 provides low-current conditioning of the battery. A constant current-charging phase replenishes 70% of the charge capacity, and a voltage-regulated phase returns the battery to full. The charge cycle terminates when the charging current falls below a user-selectable current limit. For safety, charging terminates after maximum time and is suspended if the temperature is outside the preconfigured limits. The bq2054 provides status indications of all charger states and faults for accurate determination of the battery and charge system conditions.

TM ICTL Time-out programming input Inrush current control output Battery voltage input Voltage loop comp input Current loop comp input Minimum current termination select input Sense resistor input Temperature sense input TPWM LED3 Regulator timebase input Charge status output 3 Common LED output System ground 5.0V 10% power Modulation control output Charge status output 1 Charge status output 2/ Display select input

TM Time-out programming input This input sets the maximum charge time. The resistor and capacitor values are determined using Equation 5. Figure 7 shows the resistor/capacitor connection. ICTL Inrush current control output ICTL is driven low during the fault or charge-complete states of the chip. It is used to disconnect the capacitor across the battery pack terminals, preventing inrush currents from tripping overcurrent protection features in the pack when a new battery is inserted. BAT Battery voltage input BAT is the battery voltage sense input. This potential is generally developed using a high-impedance resistor divider network connected between the positive and the negative terminals of the battery. See Figure 4 and Equation 1. VCOMP Voltage loop compensation input This input uses an external R-C network for voltage loop stability. ITERM Minimum current termination select This three-state input is used to set IMIN for fast charge termination. See Table 2. ICOMP Current loop compensation input This input uses an external R-C network for current loop stability. SNS Charging current sense input Battery current is sensed via the voltage developed on this pin by an external sense resistor, RSNS, connected in series with the negative terminal of the battery pack. See Equation 6. VSS VCC DSEL LED3 TS Temperature sense input This input is used to monitor battery temperature. An external resistor divider network sets the lower and upper temperature thresholds. See Figure 6 and Equations 3 and 4. TPWM Regulation timebase input This input uses an external timing capacitor to ground to set the pulse-width modulation (PWM) frequency. See Equation 7. LCOM Common LED output Common output for LED13. This output in a high-impedance state during initializ programming input on DSEL. MOD Current-switching control output MOD is a pulse-width modulated push/pull output that is used to control the charging current to the battery. MOD switches high to enable current flow and low to inhibit current flow. Charger display status 13 outputs These charger status output drivers are for the direct drive of the LED display. Display modes are shown in Table 1. These outputs are tri-stated during initialization so that DSEL can be read. Display select input This three-level input controls the LED13 charge display modes. See Table 1. VCC supply 10% power Ground

The bq2054 uses a two-phase fast charge algorithm. In phase 1, the bq2054 regulates constant current (ISNS = IMAX) until VCELL VBAT - VSNS) rises to VREG. The bq2054 then transitions to phase 2 and regulates constant voltage (VCELL = VREG) until the charging current falls below the programmed IMIN threshold. The charging current must remain below IMIN for 40ms before a valid fast charge termination is detected. Fast charge then terminates, and the bq2054 enters the Charge Complete state. See Figures 1 and 2. Thermal monitoring continues throughout the charge cycle, and the bq2054 enters the Charge Pending state when the temperature out of range. (There is one exception; if the is in the Fault state--see below--the out-of-range temperature is not recognized until the bq2054 leaves the Fault state.) All timers are suspended (but not reset) while the is in Charge Pending. When the temperature comes back into range, the bq2054 returns to the point in the charge cycle where the out-of-range temperature was detected. When the temperature is valid, the bq2054 then regulates current to ICOND (=IMAX/5). After an initial holdoff period tHO (which prevents the chip from reacting to transient voltage spikes that may occur when charge current is first applied), the chip begins monitoring VCELL. If VCELL does not rise to at least VMIN before the expiration of time-out limit tMTO (e.g. the cell has failed short), the bq2054 enters the Fault state. If VMIN is achieved before expiration of the time limit, the chip begins fast charging. Once in the Fault state, the bq2054 waits until VCC is cycled or a new battery insertion is detected. It then starts a new charge cycle and begins the qualification process again.

The bq2054 starts a charge cycle when power is applied while a battery is present or when a battery is inserted. Figure 2 shows the state diagram for pre-charge qualification and temperature monitoring. The bq2054 first checks that the battery temperature is within the allowed, user-configurable range. If the temperature is out of range, the bq2054 enters the Charge Pending state and waits until the battery temperature is within the allowed range. Charge Pending is enunciated by LED3 flashing.


 

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