BQ2000T

bq2000T Programmable Multi-Chemistry Fast-Charge Management IC Features ➤ Safe management of fast charge for NiCd, NiMH, or Li-Ion battery packs High-frequency switching controller for efficient and simple charger design Pre-charge qualification for detecting shorted, damaged, or overheated cells Fast-charge termination by D ∆Τ/∆ t m i n i m u m c u r r e n t (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 post-charge maintenance Built-in battery removal and insertion detection Sleep mode for low power consumption General Description The bq2000T is a programmable, monolithic IC for fast-charge mana g e m e n t o f n i c ke l c a d m i u m ( N i C d ) , n i c ke l m e t a l - h y d r i d e (NiMH), or lithium-ion (Li-Ion) batteries in singleor multi-chemistry applications. The bq2000T 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. Depending on the chemistry, the bq2000T provides a number of charge termination criteria: n ➤ ➤ For safety, the bq2000T 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 bq2000T uses trickle-charge to condition the battery. For NiMH batteries, the bq2000T provides an optional top-off charge to maximize the battery capacity. The integrated high-frequency comparator allows the bq2000T to be the basis for a complete, high-efficiency power-conversion circuit for both nickel-based and lithium-based chemistries. ➤ ➤ ➤ Rate of temperature rise, D ∆Τ/∆t (for NiCd and NiMH) Minimum charging current (for Li-Ion) Maximum temperature Maximum charge time n ➤ ➤ n n Pin Connections Pin Names SNS Current-sense input System ground Charge-status output Battery-voltage input TS RC VCC MOD Temperature-sense input Timer-program input Supply-voltage input Modulation-control output SNS VSS LED BAT 1 2 3 4 8 7 6 5 MOD VCC RC TS VSS LED BAT 8-Pin DIP or Narrow SOIC or TSSOP PN-2000.eps SLUS149B–FEBRUARY 2001 1 bq2000T Pin Descriptions SNS Current-sense input Enables the bq2000T 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 LED System Ground Charge-status output Open-drain output that indicates the charging status by turning on, turning off, or flashing an external LED BAT Battery-voltage input Battery-voltage sense input. A simple resistive divider, across the battery terminals, generates this input. TS 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. RC Timer-program input 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 VCC MOD Supply-voltage input Modulation-control output 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. Functional Description The bq2000T is a versatile, multi-chemistry batterycharge control device. See Figure 1 for a functional block diagram and Figure 2 for the state diagram. Figure 1. Functional Block Diagram 2 bq2000T Figure 2. State Diagram 3 bq2000T Initiation and Charge Qualification The bq2000T initiates a charge cycle when it detects n n n n charge begins when the battery temperature and voltage are valid. Application of power to VCC Battery replacement Exit from sleep mode Capacity depletion (Li-Ion only) Battery Chemistry The bq2000T detects the battery chemistry by monitoring the battery-voltage profile during fast charge. If the voltage on BAT input rises to the internal VMCV reference, the IC assumes a Li-Ion battery. Otherwise the bq2000T assumes NiCd/NiMH chemistry. 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. In 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. Once the chemistry is determined, the bq2000T 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. Immediately following initiation, the IC enters a charge-qualification mode. The bq2000T charge qualification is based on batter y voltage and temperature. If voltage on pin BAT is less than the internal threshold, VLBAT , the bq2000T 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 bq2000T 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. During this period, the LED pin blinks at a 1Hz rate, indicating the pending status of the charger. Similarly, the bq2000T suspends fast charge if the battery temperature is outside the VLTF to VHTF range. (See Table 4.) For safety reasons, however, it disables t h e p ul s e t r i c k l e , i n t h e c a s e o f a b att er y over-temperature condition (i.e., VTS < VHTF). Fast NiCd and NiMH Batteries Following qualification, the bq2000T 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 VMCV Qualification IMAX Voltage Current Fast Phase 1 Charge Phase 2 VLBAT Trickle Current IMIN Voltage GR2000CA.eps Time Figure 3. Lithium-Ion Charge Algorithm 4 bq2000T Table 1. Charge Algorithm Battery Chemistry Charge Algorithm 1. Charge qualification 2. Trickle charge, if required 3. Fast charge (constant current) 4. Charge termination (∆T/∆t, 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, time) NiCd or NiMH Li-Ion 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. termine other features of the device. See Tables 2 and 3 for details.) For Li-Ion cells, the bq2000T resets the MTO when the battery reaches the constant-voltage phase of the charge. This feature provides the additional charge time required for Li-Ion cells. Lithium-Ion Batteries The bq2000T uses a two-phase fast-charge algorithm for Li-Ion batteries (Figure 3). In phase one, the bq2000T regulates constant current until VBAT rises to VMCV. The bq2000T 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. During the current-regulation phase, the bq2000T 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. 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 bq2000T 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. ∆T/∆t (NiCd, NiMH) When fast charging, the bq2000T monitors the voltage at pin TS for rate of temperature change detection, ∆T/∆t. The bq2000T samples the voltage at the TS pin every 16s and compares it to the value measured 2 samples earlier. This feature terminates fast charge if this voltage declines at a rate of VCC  V    161  Min  Figure 5 shows a typical connection diagram. Charge Termination Maximum Charge Time (NiCD, NiMH, and Li-Ion) The bq2000T 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. The following equation shows the relationship between the RMTO and CMTO values and the maximum charge time (MTO) for the bq2000T: MTO = RMTO ∗ CMTO ∗ 35,988 MTO is measured in minutes, RMTO in ohms, and CMTO in farads. (Note: RMTO and CMTO values also de- Minimum Current (Li-Ion Only) The bq2000T monitors the charging current during the voltage-regulation phase of Li-Ion batteries. Fast charge is terminated when the current is tapered off to 7% of the maximum charging current. Please note that this threshold is different for the bq2000. Initial Hold-Off Period 5 bq2000T 2 VSS bq2000T VCC 7 CMTO RC 6 RMTO F2000T RCI.eps Figure 4. Typical Connection for the RC Input VCC 2 VSS bq2000T VCC 7 RT1 TS 5 N Battery T Pack C RT2 F2000TTMC.eps Figure 5. Temperature Monitoring Configuration BAT+ 2 VSS bq2000T RB1 4 BAT RB2 F2000TBVD.eps Figure 6. Battery Voltage Divider 6 bq2000T The values of the external resistor and capacitor connected to pin RC set the initial hold-off period. During this period, the bq2000T avoids early termination by disabling the ∆T/∆t feature. This period is fixed at the programmed value of the maximum charge time divided by 32. hold-off period = maximum time - out 32 During top-off and trickle-charge, the bq2000T monitors battery voltage and temperature. These 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 The bq2000T controls the charge current through the MOD output pin. The current-control circuit s u p p or ts a s w i tc h i n g - c u r r en t r egu l ator w i t h frequencies up to 500kHz. The bq2000T monitors charge current at the SNS input by the voltage drop across a sense-resistor, R SNS , in series with the batter y pack. See Figure 9 for a typical current-sensing circuit. R SNS is sized to provide the desired fast-charge current (IMAX): IMAX = 0.05 RSNS 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 15k Ω . To disable top-off, the capacitance value should be less than 0.07µF The tolerance of the ca. pacitor needs to be taken into account in component selection. 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. Following top-off, the bq2000T 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, which is on 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%. 160 140 120 100 If the voltage at the SNS pin is greater than VSNSLO or less than V SNSHI , the bq2000T switches the MOD output high to pass charge current to the battery. When the SNS voltage is less than VSNSLO or greater than VSNSHI, the bq2000T switches the MOD output low to shut off charging current to the battery. Figure 8 shows a typical multi-chemistry charge circuit. Voltage Input 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. Shows Tolerance Pulsewidth—ms 80 60 40 20 4 3 2 1 2 4 6 8 10 50 RMTO—kΩ 2000PNvB3.eps 100 150 200 250 Figure 7. Relationship Between Trickle Pulse-Width and Value of RMTO 7 bq2000T D4 DC+ D3 MMSD914LT S1A C6 47UF Q2 MMBT3904LT1 Q1 FMMT718 L1 BAT+ 47UH D2 ZHCS1000 D5 MMSD914LT C8 R7 1K VCC 1000PF R9 120 OHMS Q3 MMBT3904LT1 R8 220 OHMS R4 210K D6 BZT52-C5V1 R2 2K C3 10UF C7 C4 4.7PF 0.0022UF R1 R13 10.5K C9 0.33UF C5 10UF D1 RED 1 2 3 4 C2 0.1 U1 SNS VSS LED BAT MOD VCC RC TS 100K 8 7 6 5 R12 THERM 100K C1 0.1 R11 6.81K C10 0.01UF R5 200K R14 23.2K R6 221K CHEMISTRY BAT - bq2000T R10 1.1K R3 0.05 OHM NOTES: 1. For Li-Ion, the CHEMISTRY is left floating. For NiCd/NiMH, the CHEMISTRY is tied to BAT2. DC input voltage: 9–16V 3. Charge current: 1A 4. L1: 3L Global P/N PKSMD-1005-470K-1A Pn1031a02.eps Figure 8. Single-Cell Li-Ion, Three-Cell NiCd/NiMH 1A Charger 8 bq2000T Table 2. Summary of NiCd or NiMH Charging Characteristics Parameter Maximum cell voltage (VMCV) Minimum pre-charge qualification voltage (VLBAT) High-temperature cutoff voltage (VTCO) High-temperature fault voltage (VHTF) Low-temperature fault voltage (VLTF) bq2000T fast-charge maximum time out (MTO) Fast-charge charging current (IMAX) Hold-off period Top-off charging current (optional) Top-off period (optional) Trickle-charge frequency Trickle-charge pulse-width For Li-Ion battery packs, the resistor values RB1 and RB2 are calculated by the following equation: 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-to-end input impedance of this resistive divider network should be at least 200kΩ and no more than 1MΩ. A NiCd or NiMH battery pack consisting of N series-cells may benefit by the selection of the RB1 value to be N-1 times larger than the RB2 value. 2V 950mV 0.225 ∗ VCC 0.25 ∗ VCC 0.5 ∗ VCC RMTO ∗ CMTO ∗ 35,988 0.05/RSNS MTO/32 IMAX/16 MTO 1Hz See Figure 7 In 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. Value Temperature Monitoring The bq2000T measures the temperature by the voltage at the TS pin. This voltage is typically generated by a negative-temperature-coefficient thermistor. The bq2000T compares this voltage against its internal threshold voltages to determine if charging is safe. Table 3. Summary of Li-Ion Charging Characteristics Parameter Maximum cell voltage (VMCV) Minimum pre-charge qualification voltage (VLBAT) High-temperature cutoff voltage (VTCO) High-temperature fault voltage (VHTF) Low-temperature fault voltage (VLTF) bq2000T fast-charge maximum time-out (MTO) Fast-charge charging current (IMAX) Hold-off period Minimum current (for fast-charge termination) Trickle-charge frequency (before fast charge only) Trickle-charge pulse-width (before fast charge only) 2V 950mV 0.225 ∗ VCC 0.25 ∗ VCC 0.5 ∗ VCC 2 ∗ RMTO ∗ CMTO ∗ 35,988 0.05/RSNS MTO/32 IMAX/14 1Hz See Figure 7 Value 9 bq2000T Table 4. Temperature-Monitoring Conditions Temperature VTS > VLTF VHTF < VTS < VLTF VTS < VHTF Condition Cold battery—checked at all times Optimal operating range Hot battery—checked during charge qualification and top-off and trickle-charge Action Suspends fast charge or top-off and timer Allows trickle charge—LED flashes at 1Hz rate during pre-charge qualification and fast charge Allows charging Suspends fast-charge initiation, does not allow trickle charge—LED flashes at 1Hz rate during pre-charge qualification These thresholds are the following: n Table 4 summarizes these various conditions. High-temperature cutoff voltage: VTCO = 0.225 ∗ VCC This voltage corresponds to the maximum temperature (TCO) at which fast charging is allowed. The bq2000T terminates fast charge if the voltage on pin TS falls below VTCO. High-temperature fault voltage: VHTF = 0.25 ∗ VCC This voltage corresponds to the temperature (HTF) at which fast charging is allowed to begin. 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 bq2000T suspends fast charge or Charge Status Display The charge status is indicated by open-drain output LED. Table 5 summarizes the display output of the bq2000T. n n Table 5. Charge Status Display Charge Action State Battery absent Pre-charge qualification Fast charging Top-off or trickle (after fast charge, NiCd, NiMH only) Charge complete LED Status High impedance 1Hz flash Low High impedance High impedance Rf RSNS BATCf 2 VSS bq2000T Power Supply ground bq2000 ground 2000TCS.eps 1 SNS Trickle charge (before fast charge) 1Hz flash 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. Figure 9. Current-Sensing Circuit 10 Sleep Mode The bq2000T 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 bq2000T shuts down all int e rn a l c i r c u i t s , d r i v e s t h e LED o u t p u t t o high-impedance state, and drives pin MOD to low. Restoring BAT below the VMCV threshold initiates the IC and starts a fast-charge cycle. 11 bq2000T Absolute Maximum Ratings Symbol VCC VT TOPR TSTG TSOLDER Note: Parameter VCC relative to VSS DC voltage applied on any pin, excluding VCC relative to VSS Operating ambient temperature Storage temperature Soldering temperature Minimum -0.3 -0.3 -20 -40 Maximum +7.0 +7.0 +70 +125 +260 Unit V V °C °C °C 10s max. Notes 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 Symbol VTCO VHTF VLTF VMCV VLBAT VTHERM VSNSHI VSNSLO VSLP VRCH (TA = TOPR; VCC = 5V ±20% unless otherwise specified) Rating 0.225 * VCC 0.25 * VCC 0.5 * VCC 2.00 950 VCC − 161 50 -50 VCC - 1 VMCV - 0.1 Tolerance ±5% ±5% ±5% ±0.75% ±5% ±25% ±10 ±10 ±0.5 ±0.02 Unit V V V V mV V/Min mV mV V V Voltage at pin SNS Voltage at pin SNS Applied to pin BAT At pin BAT Notes Voltage at pin TS Voltage at pin TS Voltage at pin TS VBAT > VMCV inhibits fast charge Voltage at pin BAT Parameter Temperature cutoff High-temperature fault Low-temperature fault Maximum cell voltage Minimum cell voltage TS input change for ∆T/∆t detection High threshold at SNS, resulting in MOD-low Low threshold at SNS, resulting in MOD-high Sleep-mode input threshold Recharge threshold 12 bq2000T Recommended DC Operating Conditions (TA = TOPR) Symbol VCC ICC ICCS VTS VOH VOL IOZ Isnk RMTO CMTO Note: Condition Supply voltage Supply current Sleep current Thermistor input Output high Output low High-impedance leakage current Sink current Charge timer resistor Charge timer capacitor Minimum 4.0 0.5 VCC - 0.2 2 0.001 Typical 5.0 0.5 Maximum 6.0 1 5 VCC 0.2 5 20 250 1.0 Unit V mA µA V V V µA mA kΩ µF Exclusive of external loads VBAT = VSLP VTS < 0.5V prohibited MOD, IOH = 20mA MOD, LED, IOL = 20mA LED MOD, LED Notes All voltages relative to VSS except as noted. Impedance Symbol RBAT RTS RSNS Parameter Battery input impedance TS input impedance SNS input impedance Minimum 10 10 10 Typical Maximum Unit MΩ MΩ MΩ Timing Symbol dMTO fTRKL (TA = TOPR; VCC = 5V ±20% unless otherwise specified) Parameter MTO time-base variation Pulse-trickle frequency Minimum -5 0.9 Typical 1.0 Maximum +5 1.1 Unit % Hz 13 bq2000T Data Sheet Revision History Change No. 1 1 1 1 1 2 3 Page No. 5 3 7 8 10 9 2 Description Minimum current termination Added state diagram Changed capacitor value for en- Was: 0.13µF abling top-off Is: 0.26µF Figure 8 VTCO, VHTF, VLTF Minimum current (for fast charge termination) Change Figure 1 Schematic updated Tolerance updated Was: IMAX/7 Is: IMAX/14 Connection added between TS and ADC and connection deleted between BAT and ADC. Battery temperature was: (checked at all times) Is: (sampled every 16 seconds for ∆T/∆t) Was: 8-Pin TSSOP ∼ TS Package Suffix Is: 8-Pin PSOP Was: TS = 8-pin TSSOP Is: PW = 8-pin TSSOP Was: 14% Is: 7% Nature of Change 3 33 13 Note: 2 14 13 Change Figure 2 Change package Change Ordering Information Change 1 = May 1999 B changes to Final from Jan. 1999 Preliminary data sheet. Change 2 = February 2000 changes from May 1999 B. Change 3 = February 2001 C changes from February 2000 Ordering Information bq2000T Package Option: PN = 8-pin narrow plastic DIP SN = 8-pin narrow SOIC PW = 8-pin SSOP Device: bq2000T Multi-Chemistry Fast-Charge IC with ∆T/∆t Detection 14 bq2000T 8-Pin DIP (PN) 8-Pin PN (0.300" DIP) Inches D Millimeters Min. 4.06 0.38 0.38 1.40 0.20 8.89 7.62 5.84 7.62 2.29 2.92 0.51 Max. 4.57 1.02 0.56 1.65 0.33 9.65 8.26 7.11 9.40 2.79 3.81 1.02 Dimension A A1 B B1 A A1 L B1 Min. 0.160 0.015 0.015 0.055 0.008 0.350 0.300 0.230 0.300 0.090 0.115 0.020 Max. 0.180 0.040 0.022 0.065 0.013 0.380 0.325 0.280 0.370 0.110 0.150 0.040 E1 E C D E E1 e C S e G B G L S 8-Pin SOIC Narrow (SN) 8-Pin SN (0.150" SOIC) Inches Dimension A A1 B C D E e H L Min. 0.060 0.004 0.013 0.007 0.185 0.150 0.045 0.225 0.015 Max. 0.070 0.010 0.020 0.010 0.200 0.160 0.055 0.245 0.035 Millimeters Min. 1.52 0.10 0.33 0.18 4.70 3.81 1.14 5.72 0.38 Max. 1.78 0.25 0.51 0.25 5.08 4.06 1.40 6.22 0.89 14 bq2000T 8-Pin PSOP 14 PINS SHOWN 15 PACKAGE OPTION ADDENDUM www.ti.com 4-Mar-2005 PACKAGING INFORMATION Orderable Device BQ2000TPN-B5 BQ2000TPW BQ2000TPWR BQ2000TSN-B5 BQ2000TSN-B5TR (1) Status (1) ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE Package Type PDIP TSSOP TSSOP SOIC SOIC Package Drawing P PW PW D D Pins Package Eco Plan (2) Qty 8 8 8 8 8 50 150 2000 75 2500 Pb-Free (RoHS) None None None None Lead/Ball Finish CU SNPB CU NIPDAU CU NIPDAU CU SNPB CU SNPB MSL Peak Temp (3) Level-NC-NC-NC Level-1-220C-UNLIM Level-1-220C-UNLIM Level-1-220C-UNLIM Level-1-220C-UNLIM 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. Green (RoHS & no Sb/Br): TI defines "Green" to mean "Pb-Free" and in addition, uses package materials that do not contain halogens, including bromine (Br) or antimony (Sb) above 0.1% of total product weight. (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDECindustry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. 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