Details, datasheet, quote on part number: BQ2031SN-A5TR
CategorySemiconductors => Power Management => Battery Management Products => Battery Charger IC
Part familyBQ2031 Switch-mode Lead-Acid Battery Charger with User-Selectable Charge Algorithms
DescriptionSwitch-mode Lead-Acid Battery Charger with User-Selectable Charge Algorithms 16-SOIC 0 to 0
CompanyTexas Instruments, Inc.
DatasheetDownload BQ2031SN-A5TR datasheet
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  Mecanical Data
Pin nbPackage typeInd stdJEDEC codePackage qtyCarrierDevice markWidth (mm)Length (mm)Thick (mm)Pitch (mm)
16DSOICR-PDSO-G2500LARGE T&R2031 3.919.91.581.27
Application notes
• 4Q 2011 Issue Analog Applications Journal | Doc
• Simple MPPT based Lead acid charger using BQ2031 (Rev. A)
Thisapplicationreportis intendedfor usersdesigningan MPPT-basedleadacid batterychargerwith thebq2031batterycharger.Thisreportcontainsa designfor charginga 12-A-hrleadacidbatteryusingMPPT(maximumpowerpointtracking)for maximizingchargingefficiencyfor solarap | Doc
• U-511 Switch-Mode Power Conversion Using the bq2031
The bq2031 fast-charge IC has two primary functions: lead-acid battery charge control and switch-mode power conversion control. This application note explains how to configure the bq2031 in buck-mode switching power-supply topology. It also recommends a me | Doc
• Solar charging solution provides narrow-voltage DC/DC system bus for multicell | Doc
• U-510 Using the bq2031 to Charge Lead-Acid Batteries
The bq2031 fast-charge IC has two primary functions: lead-acid battery charge control and switch-mode power conversion control. This application note discusses the operation of the bq2031 and describes a switch-mode buck regulator charger using the bq2031. | Doc
Evaluation Kits
DV2031S2: Evaluation Module for Lead Acid, switchmode BQ2031


Features, Applications

Conforms to battery manufacturers' charge recommendations for cyclic and float charge Pin-selectable charge algorithms

Ideal for high-efficiency switch-mode power conversion Configurable for linear or gated current use

Two-Step Voltage with temperature-compensated constant-voltage maintenance Two-Step Current with constant-rate pulsed current maintenance Pulsed Current: hysteretic, on-demand pulsed current

Direct LED control outputs display charge status and fault conditions

The bq2031 Lead-Acid Fast Charge IC is designed to optimize charging of lead-acid chemistry batteries. A flexible pulse-width modulation regulator allows the bq2031 to control constant-voltage, constantcurrent, or pulsed-current charging. The regulator frequency is set by an external capacitor for design flexibility. The switch-mode design keeps power dissipation to a minimum for high charge current applications. A charge cycle begins when power is applied or the battery is replaced. For safety, charging is inhibited until the battery voltage is within configured limits. If the battery voltage is less than the low-voltage threshold, the bq2031 provides trickle-current

charging until the voltage rises into the allowed range or an internal timer runs out and places the in a Fault condition. This procedure prevents high-current charging of cells that are possibly damaged or reversed. Charging is inhibited anytime the temperature of the battery is outside the configurable, allowed range. All voltage es h old p er compensated. The bq2031 terminates fast (bulk) charging based on the following:

Maximum voltage Second difference of cell voltage (2V) Minimum current (in constantvoltage charging) Maximum time-out (MTO)

Pin-selectable charge termination by maximum voltage,2V, minimum current, and maximum time Pre-charge qualification detects shorted, opened, or damaged cells and conditions battery Charging continuously qualified by temperature and voltage limits Internal temperature-compensated voltage reference Pulse-width modulation control

After bulk charging, the bq2031 provides temperature-compensated maintenance (float) charging to maintain battery capacity.

TMTO Time-out timebase input State control output Battery voltage input Voltage loop comp input Current loop comp input Current gain select input Sense resistor input Temperature sense input Regulator timebase input LED2/ DSEL Charge status output 2/ Display select input LED1/ TSEL Charge status output 1/ Charge algorithm select input 2 COM VSS VCC MOD LED3/ QSEL Charge status output 3/ Charge algorithm select input 1 Common LED output System ground 5.0V 10% power Modulation control output

TMTO Time-out timebase input This input sets the maximum charge time. The resistor and capacitor values are determined using equation 6. Figure 9 shows the resistor/capacitor connection. FLOAT Float state control output This open-drain output uses an external resistor divider network to control the BAT input voltage threshold (VFLT) for the float charge regulation. See Figure 1. BAT Battery voltage input BAT is the battery voltage sense input. This potential is generally developed using a highimpedance resistor divider network connected between the positive and the negative terminals of the battery. See Figure 6 and equation 2. VCOMP Voltage loop compensation input This input uses an external C or R-C network for voltage loop stability. IGSEL Current gain select input This three-state input is used to set IMIN for fast charge termination in the Two-Step Voltage algorithm and for maintenance current regulation in the Two-Step Current algorithm. See Tables 3 and 4. ICOMP Current loop compensation input This input uses an external C or 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 low side of the battery. See equation 8. TS Temperature sense input This input is for an external battery temperature monitoring thermistor or probe. An external resistor divider network sets the lower and upper temperature thresholds. See Figures 7 and 8 and equations 4 and 5. VCC TSEL LED13 MOD TPWM Regulation timebase input This input uses an external timing capacitor to ground the pulse-width modulation (PWM) frequency. See equation 9. COM Common LED output Common output for LED13. This output in a high-impedance state during initialization to read program inputs on TSEL, QSEL, and DSEL. QSEL Charge regulation select input With TSEL, selects the charge algorithm. See Table 1. 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 2. These outputs are tri-stated during initialization so that QSEL, TSEL, and DSEL can be read. DSEL Display select input This three-level input controls the LED13 charge display modes. See Table 2. Termination select input With QSEL, selects the charge algorithm. See Table 1. VCC supply 10% power VSS Ground

Charge algorithms Charge qualification Charge status display Voltage and current monitoring Temperature monitoring

Fast charge termination Maintenance charging Charge regulation

Temperature Checks On Temperature in Range Battery Status? Fail: tQT1 or VCELL > VHCO Absent VCELL < VLCO or VCELL > VHCO

Two-Step Voltage Two-Step Current Pulsed Current

Voltage Regulation @ VFLT + 0.25V PASS: ISNS > ICOND Test 2 VCELL < VMIN Current Regulation @ICOND PASS: VCELL > VMIN

The state transitions for these algorithms are described in Table 1 and are shown graphically in Figures 2 through 4. The user selects a charge algorithm by configuring pins QSEL and TSEL.

The bq2031 starts a charge cycle when power is applied while a battery is present or when a battery is inserted. Figure 1 shows the state diagram for pre-charge qualification and temperature monitoring. The bq2031 first checks that the battery temperature is within the allowed, user-configurable range. If the temperature is out-of-range (or the thermistor is missing), the bq2031 enters the Charge Pending state and waits until the battery temperature is within the allowed range. Charge Pending is annunciated by LED3 flashing.

Temperature Out of Range or Thermistor Absent Temperature In Range, Return to Original State
Figure 1. Cycle Start/Battery Qualification State Diagram

Algorithm/State Two-Step Voltage Fast charge, phase 1 Fast charge, phase 2 Primary termination Maintenance Two-Step Current Fast charge Primary termination Maintenance Pulsed Current Fast charge Primary termination Maintenance Notes: QSEL L TSEL H/LNote 1 Conditions while VBAT < VBLK, ISNS = IMAX while ISNS > IMIN, VBAT = VBLK ISNS = IMIN VBAT = VFLT while VBAT < VBLK, ISNS = IMAX VBAT = VBLK -8mVNote 2 ISNS pulsed to average IFLT while VBAT < VBLK, ISNS = IMAX VBAT = VBLK ISNS = IMAX after VBAT = VFLT; ISNS = 0 after VBAT = VBLK MOD Output Current regulation Voltage regulation Voltage regulation Current regulation Fixed pulse current Current regulation Hysteretic pulsed current

1. May be high or low, but do not float. 2. A Unitrode proprietary algorithm for accumulating successive differences between samples of VBAT.


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