TI BQ2000T Programmable multi-chemistry fast-charge management ic Datasheet

bq2000T
Programmable Multi-Chemistry
Fast-Charge Management IC
Features
General Description
➤
S a fe m a nag e m e nt 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 m i ni m um c ur r e nt
(Li-Ion), maximum temperature, and maximum charge
time
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.
➤
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
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, ∆T/∆t (for
NiCd and NiMH)
n
Minimum charging current (for
Li-Ion)
n
Maximum temperature
n
Maximum charge time
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
SLUS149A–FEBRUARY 2000
1
TS
Temperature-sense
input
RC
Timer-program input
VCC
Supply-voltage input
MOD
Modulation-control
output
bq2000T
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 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
System Ground
LED
Charge-status output
Supply-voltage input
MOD
Modulation-control output
Functional Description
Battery-voltage input
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.
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
∆T/∆t
ALU
Clock
Phase
Generator
Timer
Charge
Control
LED
Voltage
Comparator
MOD
RC
Internal
OSC
SNS
VCC
VSS
BD2000T.eps
Figure 1. Functional Block Diagram
2
bq2000T
4.0V < VCC < 6.0V
Charge
Initialization
VBAT < VSLP
Sleep
Mode
VMCV < VBAT < VSLP
Battery Voltage
(checked at all times)
VSLP < VBAT < VCC
VBAT < VMCV
VTS > VHTF
Charge
Suspended
VTS < VHTF
Battery Temperature
(checked at all times)
VLBAT < VBAT < VMCV and
VHTF < VTS < VLTF
VBAT < VLBAT or
VTS > VLTF
Battery
Conditioning
Current
Regulation
∆T/∆t (after hold-off period),
or VTS < VTCO or
Time = MTO
VLBAT < VBAT < VMCV and
VHTF < VTS < VLTF
VCC
Reset
Maintenance
Charge
No
Time < MTO
and
VBAT > VMCV
Voltage
Regulation
Top-Off
Selected?
Yes
Current Taper
or
Time = MTO
Time = MTO or
VTS < VTCO
Top-Off
VBAT > VMCV
Done
VBAT > VMCV
VCC Reset or Battery Replacement or Capacity Depletion (Li-Ion)
SD2000T.eps
Figure 2. State Diagram
3
bq2000T
Battery Chemistry
Initiation and Charge Qualification
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.
The bq2000T 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 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.
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.
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.
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 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
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.
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
bq2000T
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 (∆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)
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
Maximum Temperature (NiCd, NiMH, Li-Ion)
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.
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.
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.
∆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
Charge Termination
Maximum Charge Time (NiCD, NiMH, and
Li-Ion)
VCC  V 


161  Min 
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.
Figure 5 shows a typical connection diagram.
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.
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.)
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
For Li-Ion cells, the bq2000T resets the MTO when the
battery reaches the constant-voltage phase of the
5
bq2000T
2
VCC
VSS
7
bq2000T
CMTO
RC
6
RMTO
F2000T RCI.eps
Figure 4. Typical Connection for the RC Input
VCC
2
VSS
7
VCC
RT1
bq2000T
5
TS
RT2
N Battery
T Pack
C
F2000TTMC.eps
Figure 5. Temperature Monitoring Configuration
BAT+
2
VSS
RB1
bq2000T
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 =
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):
maximum time - out
32
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 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.
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.
Voltage Input
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%.
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 
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).
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.
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
bq2000T
Q1
FMMT718
D4
DC+
S1A
D3
MMSD914LT
C6
47UF
R9
120 OHMS
1000PF
Q3
MMBT3904LT1
VCC
D6
BZT52-C5V1
BAT+
D2
ZHCS1000
D5
MMSD914LT
C8
R7
1K
L1
47UH
Q2
MMBT3904LT1
R8
220 OHMS
C3
R2
2K
C7
10UF
C4
4.7PF
0.0022UF
R1
D1
RED
1
2
3
4
U1
SNS
VSS
LED
BAT
C2
0.1
R4
210K
C5
10UF
R13
10.5K
C9
0.33UF
100K
8
7
6
5
MOD
VCC
RC
TS
R12
THERM
100K
bq2000T
C1
0.1
R14
23.2K
R11
6.81K
R6
C10
0.01UF
CHEMISTRY
221K
BAT R5
200K
R10
1.1K
NOTES:
R3
0.05 OHM
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
Pn1031a02.eps
4. L1: 3L Global P/N PKSMD-1005-470K-1A
Figure 8. Single-Cell Li-Ion, Three-Cell NiCd/NiMH 1A Charger
8
bq2000T
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
bq2000T 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
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.
bq2000T compares this voltage against its internal
threshold voltages to determine if charging is safe.
These thresholds are the following:
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.
n
Temperature Monitoring
n
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
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
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
bq2000T 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/14
Trickle-charge frequency (before fast charge only)
1Hz
Trickle-charge pulse-width (before fast charge only)
See Figure 7
9
bq2000T
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
VTS < VTCO
Battery exceeding maximum allowable
temperature—checked at all times
(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.
Terminates fast charge or top-off
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.
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
bq2000T.
Table 5. Charge Status Display
Charge Action State
Rf
LED Status
Battery absent
High impedance
Pre-charge qualification
1Hz flash
Trickle charge (before fast charge)
1Hz flash
Fast charging
Low
Power Supply ground
Top-off or trickle (after fast charge,
NiCd, NiMH only)
High impedance
bq2000 ground
Charge complete
High impedance
Sleep mode
High impedance
Charge suspended (VTS > VLTF)
1Hz flash
RSNS
1 SNS
Cf
2
BAT-
VSS
bq2000T
2000TCS.eps
Figure 9. Current-Sensing Circuit
10
bq2000T
Absolute Maximum Ratings
Symbol
Parameter
Minimum
Maximum
Unit
VCC
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:
(TA = TOPR; VCC = 5V ± 20% unless otherwise specified)
Symbol
VTCO
VHTF
VLTF
Parameter
Temperature cutoff
High-temperature fault
Low-temperature fault
VMCV
Maximum cell voltage
VLBAT
Minimum cell voltage
TS input change for ∆T/∆t detection
VSLP
High threshold at SNS, resulting in
MOD-low
Low threshold at SNS, resulting in
MOD-high
Sleep-mode input threshold
VRCH
Recharge threshold
VSNSHI
VSNSLO
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
VTHERM
Notes
Rating
0.225 * VCC
0.25 * VCC
0.5 * VCC
Tolerance
± 5%
± 5%
± 5%
Unit
V
V
V
2.00
± 0.75%
V
950
VCC
161
± 5%
mV
± 25%
V/Min
50
±10
mV
Voltage at pin SNS
-50
±10
mV
Voltage at pin SNS
VCC - 1
±0.5
V
Applied to pin BAT
VMCV - 0.1
±0.02
V
At pin BAT
−
11
Notes
Voltage at pin TS
Voltage at pin TS
Voltage at pin TS
VBAT > VMCV inhibits
fast charge
Voltage at pin BAT
bq2000T
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 - 0.2
-
-
V
MOD, IOH = 20mA
VOL
Output low
-
-
0.2
V
MOD, LED, IOL = 20mA
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
bq2000T
Data Sheet Revision History
Change No.
Note:
Page No.
Description
Nature of Change
Was: 14%
Is: 7%
1
5
Minimum current termination
1
3
Added state diagram
1
7
Changed capacitor value for enabling top-off
Was: 0.13µF
Is: 0.26µF
1
8
Figure 8
Schematic updated
1
10
VTCO, VHTF, VLTF
Tolerance updated
2
9
Minimum current (for fast charge Was: IMAX/7
Is: IMAX/14
termination)
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
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
14
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
bq2000T
8-Pin TSSOP ~ TS Package Suffix
Millimeters
Dimension
A
Min.
Max.
-
A1
0.05
B
C
Inches
Min.
Max.
1.10
-
0.043
0.15
0.002
0.006
0.18
0.30
0.007
0.012
0.09
0.18
0.004
0.007
D
2.90
3.10
0.115
0.122
E
4.30
4.48
0.169
0.176
e
0.65BSC
0.0256BSC
H
6.25
6.50
0.246
0.256
L
0.50
0.70
0.020
0.028
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
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Copyright © 2000, Texas Instruments Incorporated
16
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