bq2000 Programmable Multi-Chemistry Fast-Charge Management IC Features General Description ➤ Safe management of fast charge for NiCd, NiMH, or LiIon battery packs ➤ High-frequency switching controller for efficient and simple charger design ➤ Pre-charge qualification for detecting shorted, damaged, or overheated cells The bq2000 is a programmable, monolithic IC for fast-charge management of nickel cadmium (NiCd), nickel metal-hydride (NiMH), or lithium-ion (Li-Ion) batteries in single- or multi-chemistry applications. The bq2000 detects the battery chemistry and proceeds with the optimal charging and termination algorithms. This process eliminates undesirable undercharged or overcharged conditions and allows accurate and safe termination of fast charge. ➤ Fast-charge termination by peak voltage (PVD), minimum current (Li-Ion), maximum temperature, and maximum charge time ➤ Selectable top-off mode for achieving maximum capacity in NiMH batteries ➤ Programmable trickle-charge mode for reviving deeply discharged batteries and for postcharge maintenance ➤ Built-in battery removal and insertion detection ➤ Sleep mode for low power consumption Depending on the chemistry, the bq2000 provides a number of charge termination criteria: n Peak voltage, PVD (for NiCd and NiMH) n Minimum charging current (f or Li-Ion) n Maximum temperature n Maximum charge time For safety, the bq2000 inhibits fast charge until the battery voltage and temperature are within user-defined limits. If the battery voltage is below the low-voltage threshold, the bq2000 uses trickle-charge to condition the battery. For NiMH batteries, the bq2000 provides an optional top-off charge to maximize the battery capacity. The integrated high-frequency comparator allows the bq2000 to be the basis for a complete, high-efficiency power-conversion circuit for both nickel-based and lithium-based chemistries. Pin Names Pin Connections SNS 1 8 MOD VSS 2 7 VCC LED 3 6 RC BAT 4 5 TS SNS Current-sense input VSS System ground LED Charge-status output BAT Battery-voltage input 8-Pin DIP or Narrow SOIC or TSSOP PN-2000.eps SLUS138B–FEBRUARY 2001 F 1 TS Temperature-sense input RC Timer-program input VCC Supply-voltage input MOD Modulation-control output bq2000 RC Pin Descriptions SNS RC input used to program the maximum charge-time, hold-off period, and trickle rate during the charge cycle, and to disable or enable top-off charge Current-sense input Enables the bq2000 to sense the battery current via the voltage developed on this pin by an external sense-resistor connected in series with the battery pack VSS System Ground LED Charge-status output Supply-voltage input MOD Modulation-control output Functional Description Battery-voltage input The bq2000 is a versatile, multi-chemistry batterycharge control device. See Figure 1 for a functional block diagram and Figure 2 for a state diagram. Battery-voltage sense input. A simple resistive divider, across the battery terminals, generates this input. TS VCC Push-pull output that controls the charging current to the battery. MOD switches high to enable charging current to flow and low to inhibit charging- current flow. Open-drain output that indicates the charging status by turning on, turning off, or flashing an external LED BAT Timer-program input Temperature-sense input Input for an external battery-temperature monitoring circuit. An external resistive divider network with a negative temperature-coefficient thermistor sets the lower and upper temperature thresholds. TS Voltage Reference BAT OSC Voltage Comparator ADC PVD ALU Clock Phase Generator Timer Charge Control LED Voltage Comparator MOD RC Internal OSC SNS VCC VSS bq2000BD.eps Figure 1. Functional Block Diagram 2 bq2000 Figure 2. State Diagram 3 bq2000 Battery Chemistry Initiation and Charge Qualification The bq2000 detects the battery chemistry by monitoring the battery-voltage profile during the initial stage of the fast charge. If the voltage on BAT input rises to the internal VMCV reference, the IC assumes a Li-Ion battery. Otherwise the bq2000 assumes NiCd/NiMH chemistry. The bq2000 initiates a charge cycle when it detects n Application of power to VCC n Battery replacement n Exit from sleep mode n Capacity depletion (Li-Ion only) As shown in Figure 6, a resistor voltage-divider between the battery pack’s positive terminal and VSS scales the b a t t er y v olt a g e m ea s u r ed a t p in B AT. I n a mixed-chemistry design, a common voltage-divider is used as long as the maximum charge voltage of the nickel-based pack is below that of the Li-Ion pack. Otherwise, different scaling is required. Immediately following initiation, the IC enters a charge-qualification mode. The bq2000 charge qualification is based on battery voltage and temperature. If voltage on pin BAT is less than the internal threshold, VLBAT , the bq2000 enters the charge-pending state. This condition indicates the possiblility of a defective or shorted battery pack. In an attempt to revive a fully depleted pack, the bq2000 enables the MOD pin to trickle-charge at a rate of once every 1.0s. As explained in the section “Top-Off and Pulse-Trickle Charge,” the trickle pulse-width is user-selectable and is set by the value of the resistance connected to pin RC. Once the chemistry is determined, the bq2000 completes the fast charge with the appropriate charge algorithm (Table 1). The user can customize the algorithm by programming the device using an external resistor and a capacitor connected to the RC pin, as discussed in later sections. NiCd and NiMH Batteries During this period, the LED pin blinks at a 1Hz rate, indicating the pending status of the charger. Following qualification, the bq2000 fast-charges NiCd or NiMH batteries using a current-limited algorithm. During the fast-charge period, it monitors charge time, temperature, and voltage for adherence to the termination criteria. This monitoring is further explained in later sections. Following fast charge, the battery is topped off, if top-off is selected. The charging cycle ends with a trickle maintenance-charge that continues as long as the voltage on pin BAT remains below VMCV. Similarly, the bq2000 suspends fast charge if the battery temperature is outside the VLTF to VHTF range. (See Table 4.) For safety reasons, however, it disables the pulse trickle, in the case of a battery over-temperature condition (i.e., VTS < VHTF). Fast charge begins when the battery temperature and voltage are valid. Current IMAX Qualification VMCV Voltage Fast Charge Phase 1 VLBAT Phase 2 Voltage Trickle Current IMIN Time GR2000CA.eps Figure 3. Lithium-Ion Charge Algorithm 4 bq2000 Table 1. Charge Algorithm Battery Chemistry NiCd or NiMH Li-Ion Charge Algorithm 1. Charge qualification 2. Trickle charge, if required 3. Fast charge (constant current) 4. Charge termination (peak voltage, maximum charge time) 5. Top-off (optional) 6. Trickle charge 1. Charge qualification 2. Trickle charge, if required 3. Two-step fast charge (constant current followed by constant voltage) 4. Charge termination (minimum current, maximum charge time) charge. This feature provides the additional charge time required for Li-Ion cells. Lithium-Ion Batteries The bq2000 uses a two-phase fast-charge algorithm for Li-Ion batteries (Figure 3). In phase one, the bq2000 regulates constant current until VBAT rises to VMCV. The bq2000 then moves to phase two, regulates the battery with constant voltage of VMCV, and terminates when the charging current falls below the IMIN threshold. A new charge cycle is started if the cell voltage falls below the VRCH threshold. Maximum Temperature (NiCd, NiMH, Li-Ion) A negative-coefficient thermistor, referenced to VSS and placed in thermal contact with the battery, may be used as a temperature-sensing device. Figure 5 shows a typical temperature-sensing circuit. During fast charge, the bq2000 compares the battery temperature to an internal high-temperature cutoff threshold, VTCO. As shown in Table 4, high-temperature termination occurs when voltage at pin TS is less than this threshold. During the current-regulation phase, the bq2000 monitors charge time, battery temperature, and battery voltage for adherence to the termination criteria. During the final constant-voltage stage, in addition to the charge time and temperature, it monitors the charge current as a termination criterion. There is no post-charge maintenance mode for Li-Ion batteries. Peak Voltage (NiCd, NiMH) The bq2000 uses a peak-voltage detection (PVD) scheme to terminate fast charge for NiCd and NiMH batteries. The bq2000 continuously samples the voltage on the BAT pin, representing the battery voltage, and triggers the peak detection feature if this value falls below the maximum sampled value by as much as 3.8mV (PVD). As shown in Figure 6, a resistor voltage-divider between the battery pack’s positive terminal and VSS scales the battery voltage measured at pin BAT. Charge Termination Maximum Charge Time (NiCD, NiMH, and Li-Ion) The bq2000 sets the maximum charge-time through pin RC. With the proper selection of external resistor and capacitor, various time-out values may be achieved. Figure 4 shows a typical connection. For Li-Ion battery packs, the resistor values RB1 and RB2 are calculated by the following equation: The following equation shows the relationship between the RMTO and CMTO values and the maximum charge time (MTO) for the bq2000: RB1 VCELL −1 = N∗ RB2 VMCV where N is the number of cells in series and VCELL is the manufacturer-specified charging voltage. The end-toend input impedance of this resistive divider network should be at least 200kΩ and no more than 1MΩ. MTO = RMTO ∗ CMTO ∗ 35,988 MTO is measured in minutes, RMTO in ohms, and CMTO in farads. (Note: RMTO and CMTO values also determine other features of the device. See Tables 2 and 3 for details.) A NiCd or NiMH battery pack consisting of N seriescells may benefit by the selection of the RB1 value to be N-1 times larger than the RB2 value. For Li-Ion cells, the bq2000 resets the MTO when the battery reaches the constant-voltage phase of the In a mixed-chemistry design, a common voltage-divider is used as long as the maximum charge voltage of the 5 bq2000 2 VCC VSS 7 bq2000 CMTO RC 6 RMTO F2000 RCI.eps Figure 4. Typical Connection for the RC Input VCC 2 VSS 7 VCC RT1 bq2000 5 TS RT2 N Battery T Pack C F2000TMC.eps Figure 5. Temperature Monitoring Configuration BAT+ 2 VSS RB1 bq2000 4 BAT RB2 F2000BVD.eps Figure 6. Battery Voltage Divider 6 bq2000 nickel-based pack is below that of the Li-Ion pack. Otherwise, different scaling is required. Once enabled, the top-off is performed over a period equal to the maximum charge time at a rate of 116 that of fast charge. Minimum Current (Li-Ion Only) Following top-off, the bq2000 trickle-charges the battery by enabling the MOD to charge at a rate of once every 1.0 second. The trickle pulse-width is user-selectable and is set by the value of the resistor RMTO, connected to pin RC. Figure 7 shows the relationship between the trickle pulse-width and the value of RMTO. The typical tolerance of the pulsewidth below 150kΩ is ±10%. The bq2000 monitors the charging current during the voltage-regulation phase of Li-Ion batteries. Fast charge is terminated when the current is tapered off to 14% of the maximum charging current. Initial Hold-Off Period The values of the external resistor and capacitor connected to pin RC set the initial hold-off period. During this period, the bq2000 avoids early termination due to an initial rise in the battery voltage by disabling the peak voltage-detection feature. This period is fixed at the programmed value of the maximum charge time divided by 32. During top-off and trickle-charge, the bq2000 monitors battery voltage and temperature. These charging functions are suspended if the battery voltage rises above the maximum cell voltage (VMCV) or if the temperature exceeds the high-temperature fault threshold (VHTF). Charge Current Control maximum time - out hold-off period = 32 The bq2000 controls the charge current through the MOD output pin. The current-control circuit supports a switching-current regulator with frequencies up to 500kHz. The bq2000 monitors charge current at the SNS input by the voltage drop across a sense-resistor, RSNS, in series with the battery pack. See Figure 9 for a typical current-sensing circuit. RSNS is sized to provide the desired fast-charge current (IMAX): Top-Off and Pulse-Trickle Charge An optional top-off charge is available for NiCd or NiMH batteries. Top-off may be desirable on batteries that have a tendency to terminate charge before reaching full capacity. To enable this option, the capacitance value of CMTO connected to pin RC (Figure 4) should be greater than 0.13µF, and the value of the resistor connected to this pin should be less than 15kΩ. To disable top-off, the capacitance value should be less than 0.07µF. The tolerance of the capacitor needs to be taken into account in component selection. IMAX = 0.05 RSNS If the voltage at the SNS pin is greater than VSNSLO or less than VSNSHI, the bq2000 switches the MOD output high to pass charge current to the battery. When the 200 180 160 140 120 Shows Tolerance Pulsewidth—ms 100 80 60 40 20 4 3 2 1 2 4 6 8 10 50 100 150 200 250 RMTO—kΩ 2000PNvB3.eps Figure 7. Relationship Between Trickle Pulse-Width and Value of RMTO 7 bq2000 Q1 FMMT718 D4 DC+ S1A D3 MMSD914LT C6 47UF D5 MMSD914LT C9 R10 1K R12 120 OHMS Q3 MMBT3904LT1 C3 10UF R2 2K BAT+ D2 ZHCS1000 1000PF VCC D6 BZT52-C5V1 L1 47UH Q2 MMBT3904LT1 C7 4.7PF C4 0.0022UF R1 D1 RED 1 2 3 4 C2 0.1 R11 220 OHMS U1 SNS VSS LED BAT R6 210K C5 10UF R4 12.4K C8 0.33UF 100K 8 7 6 5 MOD VCC RC TS THERM bq2000 C1 0.1 R8 6.81K R9 R5 20K 221K CHEMISTRY BAT R7 200K R13 1.1K NOTES: R3 0.05 OHM 1. For Li-Ion, the CHEMISTRY is left floating. For NiCd/NiMH, the CHEMISTRY is tied to BAT- Pn1031a01.eos 2. DC input voltage: 9–16V 3. Charge current: 1A 4. L1: 3L Global P/N PKSMD-1005-470K-1A Figure 8. Single-Cell Li-Ion, Three-Cell NiCd/NiMH 1A Charger 8 bq2000 Table 2. Summary of NiCd or NiMH Charging Characteristics Parameter Value* Maximum cell voltage (VMCV) 2V Minimum pre-charge qualification voltage (VLBAT) 950mV High-temperature cutoff voltage (VTCO) 0.225 ∗ VCC High-temperature fault voltage (VHTF) 0.25 ∗ VCC Low-temperature fault voltage (VLTF) 0.5 ∗ VCC bq2000 fast-charge maximum time out (MTO) RMTO ∗ CMTO ∗ 35,988 Fast-charge charging current (IMAX) 0.05/RSNS Hold-off period MTO/32 Top-off charging current (optional) IMAX/16 Top-off period (optional) MTO Trickle-charge frequency 1Hz Trickle-charge pulse-width See Figure 7 *Please refer to DC Thresholds Specification for details. SNS voltage is less than VSNSLO or greater than VSNSHI, the bq2000 switches the MOD output low to shut off charging current to the battery. Figure 8 shows a typical multi-chemistry charge circuit. ative-temperature-coefficient thermistor. The bq2000 compares this voltage against its internal threshold voltages to determine if charging is safe. These thresholds are the following: n Temperature Monitoring The bq2000 measures the temperature by the voltage at the TS pin. This voltage is typically generated by a neg- High-temperature cutoff voltage: VTCO = 0.225 ∗ VCC This voltage corresponds to the maximum temperature (TCO) at which fast charging is allowed. The bq2000 terminates fast charge if the voltage on pin TS falls below VTCO. Table 3. Summary of Li-Ion Charging Characteristics Parameter Value* Maximum cell voltage (VMCV) 2V Minimum pre-charge qualification voltage (VLBAT) 950mV High-temperature cutoff voltage (VTCO) 0.225 ∗ VCC High-temperature fault voltage (VHTF) 0.25 ∗ VCC Low-temperature fault voltage (VLTF) 0.5 ∗ VCC bq2000 fast-charge maximum time-out (MTO) 2 ∗ RMTO ∗ CMTO ∗ 35,988 Fast-charge charging current (IMAX) 0.05/RSNS Hold-off period MTO/32 Minimum current (for fast-charge termination) IMAX/7 Trickle-charge frequency (before fast charge only) 1Hz Trickle-charge pulse-width (before fast charge only) See Figure 7 *Please refer to DC Thresholds Specification for details. 9 bq2000 Table 4. Temperature-Monitoring Conditions Temperature Condition Action VTS > VLTF Cold battery—checked at all times Suspends fast charge or top-off and timer Allows trickle charge—LED flashes at 1Hz rate during pre-charge qualification and fast charge VHTF < VTS < VLTF Optimal operating range Allows charging VTS < VHTF Suspends fast-charge initiation, does not allow Hot battery—checked during charge qualitrickle charge—LED flashes at 1Hz rate during fication and top-off and trickle-charge pre-charge qualification and fast charge VTS < VTCO Battery exceeding maximum allowable temperature—checked at all times n n Terminates fast charge or top-off Sleep Mode High-temperature fault voltage: VHTF = 0.25 ∗ VCC This voltage corresponds to the temperature (HTF) at which fast charging is allowed to begin. The bq2000 features a sleep mode for low power consumption. This mode is enabled when the voltage at pin BAT is above the low-power-mode threshold, VSLP. During sleep mode, the bq2000 shuts down all internal circuits, drives the LED output to high-impedance state, and drives pin MOD to low. Restoring BAT below the VMCV threshold initiates the IC and starts a fast-charge cycle. Low-temperature fault voltage: VLTF = 0.5 ∗ VCC This voltage corresponds to the minimum temperature (LTF) at which fast charging or top-off is allowed. If the voltage on pin TS rises above VLTF, the bq2000 suspends fast charge or top-off but does not terminate charge. When the voltage falls back below VLTF, fast charge or top-off resumes from the point where suspended. Trickle-charge is allowed during this condition. Table 4 summarizes these various conditions. Charge Status Display The charge status is indicated by open-drain output LED. Table 5 summarizes the display output of the bq2000. Rf Table 5. Charge Status Display Charge Action State RSNS Battery absent High impedance Pre-charge qualification 1Hz flash Power Supply ground Trickle charge (before fast charge) 1Hz flash bq2000 ground Fast charging Low Top-off or trickle (after fast charge, NiCd, NiMH only) High impedance Charge complete High impedance Sleep mode High impedance Charge suspended (VTS > VLTF) 1Hz flash Cf 2 BAT- LED Status 1 SNS VSS bq2000 2000CS.eps Figure 9. Current-Sensing Circuit 10 bq2000 Absolute Maximum Ratings Minimum Maximum Unit VCC Symbol VCC relative to VSS -0.3 +7.0 V VT DC voltage applied on any pin, excluding VCC relative to VSS -0.3 +7.0 V TOPR Operating ambient temperature -20 +70 °C TSTG Storage temperature -40 +125 °C TSOLDER Soldering temperature - +260 °C Note: Parameter Notes 10s max. Permanent device damage may occur if Absolute Maximum Ratings are exceeded. Functional operation should be limited to the Recommended DC Operating Conditions detailed in this data sheet. Exposure to conditions beyond the operational limits for extended periods of time may affect device reliability. DC Thresholds (TA = TOPR; VCC = 5V ±20% unless otherwise specified) Symbol VTCO VHTF VLTF Parameter Temperature cutoff High-temperature fault Low-temperature fault Rating 0.225 * VCC 0.25 * VCC 0.5 * VCC Tolerance ±5% ±5% ±5% Unit V V V VMCV VLBAT PVD Maximum cell voltage 2.00 ±0.75% V 950 3.8 ±5% ±20% mV mV 50 ±10 mV Voltage at pin SNS -50 ±10 mV Voltage at pin SNS VSLP Minimum cell voltage BAT input change for PVD detection High threshold at SNS, resulting in MOD-low Low threshold at SNS, resulting in MOD-high Sleep-mode input threshold VCC - 1 ±0.5 V Applied to pin BAT VRCH Recharge threshold VMCV - 0.1 ±0.02 V At pin BAT VSNSHI VSNSLO 11 Notes Voltage at pin TS Voltage at pin TS Voltage at pin TS VBAT > VMCV inhibits fast charge Voltage at pin BAT bq2000 Recommended DC Operating Conditions (TA = TOPR) Symbol Condition Minimum Typical Maximum Unit Notes VCC Supply voltage 4.0 5.0 6.0 V ICC Supply current - 0.5 1 mA Exclusive of external loads ICCS Sleep current - - 5 µA VBAT = VSLP VTS Thermistor input 0.5 - VCC V VTS < 0.5V prohibited VOH Output high VCC - 0.6 - - V MOD, IOH = 10mA VOL Output low - - 0.2 V MOD, LED, IOL = 10mA IOZ High-impedance leakage current - - 5 µA LED Isnk Sink current - - 20 mA MOD, LED RMTO Charge timer resistor 2 - 250 kΩ CMTO Charge timer capacitor 0.001 - 1.0 µF Note: All voltages relative to VSS except as noted. Impedance Symbol Parameter Minimum Typical Maximum Unit RBAT Battery input impedance 10 - - MΩ RTS TS input impedance 10 - - MΩ RSNS SNS input impedance 10 - - MΩ Minimum Typical Maximum Unit Timing Symbol (TA = TOPR; VCC = 5V ±20% unless otherwise specified) Parameter dMTO MTO time-base variation -5 - +5 % fTRKL Pulse-trickle frequency 0.9 1.0 1.1 Hz 12 bq2000 8-Pin DIP (PN) 8-Pin PN (0.300" DIP) Inches D E1 E A B1 A1 L C B S e G Millimeters Dimension A Min. Max. Min. Max. 0.160 0.180 4.06 4.57 A1 0.015 0.040 0.38 1.02 B 0.015 0.022 0.38 0.56 B1 0.055 0.065 1.40 1.65 C 0.008 0.013 0.20 0.33 D 0.350 0.380 8.89 9.65 E 0.300 0.325 7.62 8.26 E1 0.230 0.280 5.84 7.11 e 0.300 0.370 7.62 9.40 G 0.090 0.110 2.29 2.79 L 0.115 0.150 2.92 3.81 S 0.020 0.040 0.51 1.02 8-Pin SOIC Narrow (SN) 8-Pin SN (0.150" SOIC) Inches 13 Millimeters Dimension A Min. Max. Min. Max. 0.060 0.070 1.52 1.78 A1 0.004 0.010 0.10 0.25 B 0.013 0.020 0.33 0.51 C 0.007 0.010 0.18 0.25 D 0.185 0.200 4.70 5.08 E 0.150 0.160 3.81 4.06 e 0.045 0.055 1.14 1.40 H 0.225 0.245 5.72 6.22 L 0.015 0.035 0.38 0.89 bq2000 8-Pin TSSOP (PW) 14 bq2000 Data Sheet Revision History Change No. Note: Page No. Description Nature of Change 1 4 MTO equation Was: MTO = R ∗ C ∗ 71,976 Is: MTO = RMTO ∗ CMTO ∗ 35,988 1 6 Trickle-pulse width equation Replaced equation with Figure 6 1 7 Figure 7 Schematic updated 1 10 VTCO, VHTF, VLTF Tolerance updated 1 11 RMTO, CMTO Values updated 2 8 VLBAT Corrected values in Tables 2 and 3 3 1, 13 Package option Added TSSOP 3 3 State diagram Added 3 8 Schematic updated 3 11 VTSO, VHTF,VLTF Tolerance updated 3 7 Top-off charge Updated requirement for enabling top-off 4 7 Figure 7 Updated tolerance on the curve 4 12 VOH Was: Minimum VOH = VCC - 0.2 at IOH = 20mA Is: Minimum VOH = VCC - 0.6 at IOH = 10mA 4 12 VOL Was: IOH = 20mA Is: IOH = 10mA 5 3 Figure 2 Battery voltage detail was: (checked at all times) Is: Voltage regulation checked constantly. PVD checked at rate of MTO/64. 5 3 Figure 2 Battery temperature detail was: (checked at all times) Is: (checked 1,750 times per second) 6 14 Change package Was: 8-Pin TSSOP ∼ TS Package Suffix Is: 8-Pin PSOP 5 15 Change ordering information Was: TS = 8-pin TSSOP Is: PW = 8-pin TSSOP Change 1 = Jan. 1999 B changes to Final from Sept. 1998 Preliminary data sheet. Change 2 = Mar. 1999 C changes from Jan. 1999 B. Change 3 = May 1999 D changes from Mar. 1999 C. Change 4 = February 2000 E changes from May 1999 D. Change 5 = February 2001 F changes from February 2000 E 15 bq2000 Ordering Information bq2000 Package Option: PN = 8-pin narrow plastic DIP SN = 8-pin narrow SOIC PW = 8-pin TSSOP Device: bq2000 Multi-Chemistry Fast-Charge IC with Peak Voltage Detection 16 PACKAGE OPTION ADDENDUM www.ti.com 4-Mar-2005 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty BQ2000PN-B5 ACTIVE PDIP P 8 Lead/Ball Finish 50 Pb-Free (RoHS) CU SNPB MSL Peak Temp (3) Level-NC-NC-NC BQ2000PW ACTIVE TSSOP PW 8 150 None CU NIPDAU Level-1-220C-UNLIM BQ2000PWR ACTIVE TSSOP PW 8 2000 None CU NIPDAU Level-1-220C-UNLIM BQ2000SN-B5 ACTIVE SOIC D 8 75 None CU SNPB Level-1-220C-UNLIM BQ2000SN-B5TR ACTIVE SOIC D 8 2500 None CU SNPB Level-1-220C-UNLIM (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - May not be currently available - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. None: Not yet available Lead (Pb-Free). Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. 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