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bq2000T
Programmable Multi-Chemistry Fast-Charge Management IC
Features
(R) Sa fe man age me n t o f f as t 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 Fast-charge termination by T /t min im u m c u rre 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 postcharge maintenance Built-in battery removal and insertion detection S l e e p mo d e f o r lo w p o we r consumption
General Description
The bq2000T 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 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
(R)
(R)
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.
(R)
(R)
Rate of temperature rise, T/t (for NiCd and NiMH) Minimum charging current (for Li-Ion) Maximum temperature Maximum charge time
(R)
n
n n
(R) (R)
Pin Connections
Pin Names
SNS VSS Current-sense input System ground Charge-status output Battery-voltage input RC VCC MOD TS 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
LED BAT
RC TS
8-Pin DIP or Narrow SOIC or TSSOP
PN-2000.eps
SLUS149A-FEBRUARY 2000
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.
TS
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.
Voltage Reference
Voltage Comparator
BAT
ADC
T/t ALU
OSC
Clock Phase Generator
Timer
Charge Control
LED
RC Internal OSC Voltage Comparator MOD
SNS
VCC
VSS
BD2000T.eps
Figure 1. Functional Block Diagram
2
bq2000T
4.0V < VCC < 6.0V
Charge Initialization
VBAT < VSLP Sleep Mode
Battery Voltage
VMCV < VBAT < VSLP
(checked at all times)
VSLP < VBAT < VCC VBAT < VMCV
VTS > VHTF Charge Suspended VTS < VHTF Battery Temperature
(checked at all times)
VBAT < VLBAT or VTS > VLTF Battery Conditioning VLBAT < VBAT < VMCV and VHTF < VTS < VLTF
VLBAT < VBAT < VMCV and VHTF < VTS < VLTF Current Regulation T/t (after hold-off period), or VTS < VTCO or Time = MTO
Time < MTO and VBAT > VMCV
VCC Reset
Maintenance Charge
No
Top-Off Selected? Yes
Voltage Regulation
Current Taper or Time = MTO Time = MTO or VTS < VTCO VBAT > VMCV Done VBAT > VMCV
Top-Off
VCC Reset or Battery Replacement or Capacity Depletion (Li-Ion)
SD2000T.eps
Figure 2. State Diagram
3
bq2000T
Initiation and Charge Qualification
The bq2000T initiates a charge cycle when it detects
n n n n
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 b a ttery v ol ta g e m ea sured a t pi n BAT. 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. 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.
Application of power to VCC Battery replacement Exit from sleep mode Capacity depletion (Li-Ion only)
Immediately following initiation, the IC enters a charge-qualification mode. The bq2000T charge qualification is based on battery 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 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.
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 explained in later sections. Following fast charge, the battery is topped off, if top-off is selected. The charging cycle ends
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
with a trickle maintenance-charge that continues as long as the voltage on pin BAT remains below VMCV.
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 determine 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
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
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
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
programmed value of the maximum charge time divided by 32. hold-off period = maximum time - out 32
Charge Current Control
The bq2000T controls the charge current through the MOD output pin. The current-control circuit supports a switching-current regulator with frequencies up to 500kHz. The bq2000T 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): 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 0.13F, and the value of the resistor connected to this pin should be less than 15k. To disable top-off, the capacitance value should be less than 0.07F. The tolerance of the capacitor 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 150k is 10%. 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).
If the voltage at the SNS pin is greater than VSNSLO or less than VSNSHI, 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. For Li-Ion battery packs, the resistor values RB1 and RB2 are calculated by the following equation: RB1 VCELL = N -1 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 200k and no more than 1M.
160 140 120 100 Shows Tolerance
Pulsewidth--ms
80 60 40 20 4 3 2 1 2 4 6 8 10 50 RMTO--k
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 4.7PF C4 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 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. 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. 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 bq2000T compares this voltage against its internal threshold voltages to determine if charging is safe. These thresholds are the following:
n
Value
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
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
n
n
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 VTS < VTCO Condition Cold battery--checked at all times Optimal operating range 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 Hot battery--checked during charge qualitrickle charge--LED flashes at 1Hz rate during fication and top-off and trickle-charge pre-charge qualification Battery exceeding maximum allowable temperature--checked at all times Terminates fast charge or top-off
(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 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.
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 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.
Charge Status Display
The charge status is indicated by open-drain output LED. Table 5 summarizes the display output of the bq2000T.
Table 5. Charge Status Display
Charge Action State Battery absent Pre-charge qualification Trickle charge (before fast charge) Fast charging Top-off or trickle (after fast charge, NiCd, NiMH only) Charge complete Sleep mode Charge suspended (VTS > VLTF) LED Status High impedance 1Hz flash 1Hz flash Low High impedance High impedance High impedance 1Hz flash
Power Supply ground bq2000 ground
2000TCS.eps
Rf RSNS BATCf
1 SNS
2
VSS bq2000T
Figure 9. Current-Sensing Circuit
10
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
11
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 A V V V A mA k F 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 M M M
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
12
bq2000T
Data Sheet Revision History
Change No. 1 1 1 1 1 2 Note: Page No. 5 3 7 8 10 9 Description Minimum current termination Added state diagram Changed capacitor value for enabling top-off Figure 8 VTCO, VHTF, VLTF Was: 0.13F Is: 0.26F Schematic updated Tolerance updated Was: 14% Is: 7% Nature of Change
Minimum current (for fast charge Was: IMAX/7 termination) Is: IMAX/14
Change 1 = May 1999 B changes to Final from Jan. 1999 Preliminary data sheet. Change 2 = February 2000 changes from May 1999 B.
Ordering Information
bq2000T
Package Option:
PN = 8-pin narrow plastic DIP SN = 8-pin narrow SOIC TS = 8-pin TSSOP
Device:
bq2000T Multi-Chemistry Fast-Charge IC with T/t Detection
13
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 TSSOP ~ TS Package Suffix
Millimeters Dimension A A1 B C D E e H L Min. 0.05 0.18 0.09 2.90 4.30 6.25 0.50 Max. 1.10 0.15 0.30 0.18 3.10 4.48 6.50 0.70 0.002 0.007 0.004 0.115 0.169 0.246 0.020 Inches Min. Max. 0.043 0.006 0.012 0.007 0.122 0.176 0.256 0.028
0.65BSC
0.0256BSC
Notes: 1. Controlling dimension: millimeters. Inches shown for reference only. 2 'D' and 'E' do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.15mm per side 3 Each lead centerline shall be located within 0.10mm of its exact true position. 4. Leads shall be coplanar within 0.08mm at the seating plane. 5 Dimension 'B' does not include dambar protrusion. The dambar protrusion(s) shall not cause the lead width to exceed 'B' maximum by more than 0.08mm. 6 Dimension applies to the flat section of the lead between 0.10mm and 0.25mm from the lead tip. 7 'A1' is defined as the distance from the seating plane to the lowest point of the package body (base plane).
15
IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof.
Copyright (c)
2000, Texas Instruments Incorporated

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