TEXAS INSTRUMENTS bq2002D, bq2002T Technical data

bq2002D/T
NiCd/NiMH Fast-Charge Management ICs
Features
Fast charge of nickel cadmium
or nickel-metal hydride batter ies
Direct LED output displays
charge status Fast-charge termination by
rate of rise of temperature, maximum voltage, maximum temperature, and maximum time
Internal band-gap voltage ref
erence Optional top-off charge (bq2002T
only)
Selectable pulse-trickle charge
rates (bq2002T only)
Low-power mode 8-pin 300-mil DIP or 150-mil
SOIC
Pin Connections
TM
LED
BAT V
1
2
3
4
SS
8
CC
7
INH
V
6
CC
TS
5
General Description
The bq2002D/T Fast-Charge IC are low-cost CMOS battery-chargecontrol
­lers able to provide reliable charge ter mination for both NiCd and NiMH bat tery applications. Controlling a current-limited or constant-current supply allows the bq2002D/T to be the basis for a cost-effective stand-alone or system-integrated charger. The bq2002D/T integrates fast charge with optional top-off and pulsed-trickle con trol in a single IC for charging one or
-
more NiCd or NiMH battery cells. Fast charge is initiated on application
of the charging supply or battery re placement. For safety, fast charge is inhibited if the battery temperature and voltage are outside configured limits.
Pin Names
TM Timer mode select input LED BAT Battery voltage input V
SS
Charging status output
System ground
Fast charge is terminated by any of the following:
Rate of temperature rise
n
-
-
Maximum voltage
n
­Maximum temperature
n
Maximum time
n
After fast charge, the bq2002T option ally tops-off and pulse-trickles the battery per the pre-configured limits.
-
Fast charge may be inhibited using the INH pin. The bq2002D/T may be placed in low-standby-power mode to reduce system power consumption.
-
TS Temperature sense input V
CC
Supply voltage input INH Charge inhibit input CC Charge control output
-
8-Pin DIP or
Narrow SOIC
PN-200201.eps
bq2002D/T Selection Guide
Part No. TCO HTF LTF Fast Charge Time-Out Top-Off Maintenance
C/4 440 min None None
bq2002D
bq2002T
SLUS133B–JULY 2000
0.225 V
0.225 V
CC
CC
0.25 V
0.25 V
CC
CC
None
0.4 V
CC
1C 110 min None None 2C 55 min None None
C/4 320 min C/64 C/256
1C 80 min C/16 C/256 2C 40 min None C/128
1
bq2002D/T
Pin Descriptions
TM
LED
BAT
V
SS
TS
V
CC
INH
Timer mode input
A three-level input that controls the settings for the fast charge safety timer, voltage ter mination mode, top-off, pulse-trickle, and voltage hold-off time.
Charging output status
Open-drain output that indicates the charging status.
Battery input voltage
The battery voltage sense input. The input to this pin is created by a high-impedance re sistor divider network connected between the positive and negative terminals of the battery.
System ground T emperaturesenseinput
Input for an external battery temperature monitoring thermistor.
Supply voltage input
5.0V±20% power input.
Charge inhibit input
When high, INH suspends the fast charge in progress. When returned low, the IC re
sumes operation at the point where initially suspended.
CC
-
Charge control output
An open-drain output used to control the charging current to the battery. CC switch ing to high impedance (Z) enables charging current to flow, and low to inhibit charging current. CC is modulated to provide top-off, if enabled, and pulse trickle.
Functional Description
Figures 2 and 3 show state diagrams of bq2002D/T and Figure 4 shows the block diagram of the bq2002D/T.
-
Battery Voltageand Temperature Measurements
Battery voltage and temperature are monitored for maximum allowable values. The voltage presented on the battery sense input, BAT, should represent a single-cell potential for the battery under charge. A resistor-dividerratioof
RB1
=N-1
RB2
is recommended to maintain the battery voltage within the valid range, where N is the number of cells, RB1 is the resistor connected to the positive battery terminal, and RB2 is the resistor connected to the negative bat­tery terminal. See Figure 1.
-
-
V
CC
RT1
RB1
BAT
bq2002D/T
V
SS
RB2
BAT pin connection Thermistor connection
R3
R4
Mid-level
V
CC
TM
T
bq2002D/T
V
SS
S
RT2
PACK +
N T C
setting for TM
NTC = negative temperature coefficient thermistor.
F2002DT1.eps
Figure 1. Voltage and Temperature Monitoring and TM Pin Configuration
2
bq2002D/T
Chip on
4.0V
V
CC
Fast Charge,
CC = Z
LED = Low
V
Top-off
LED = Z
V
CC
Chip on
CC
> 0.25V
V
TS
0.25 VCC < VTS < 0.6 V
( T/ t or Maximum Time Out) and TM = High
V
> 2V or
BAT
VTS < 0.225 VCC or Maximum Time Out
Battery Voltage
V
BAT
too High?
< 2V
V
BAT
>
2V
Battery
Temperature?
V V
BAT TS
< 0.25V
V
TS
< 2V and
> 0.25V
V
T/ t or
V
> 2V or
BAT
< 0.25V
V
TS
Maximum Time Out
V
or
CC
Figure 2. bq2002D State Diagram
4.0V
Fast
LED =
Low
Battery Voltage
too High?
< 2V
V
BAT
CC
V
BAT
VTS < 0.225 VCC or (( T/ t or Maximum Time Out) and TM = High)
Battery
Temperature?
> 2V or
V
VTS > 0.6 VCC or VTS < 0.25 V
V
BAT
VTS < 0.6 VCC and VTS > 0.25 V
V
CC
BAT
< 2V and
CC
Off,
CC = Low
LED = Low
Off,
CC = Low
LED = Z
2V
>
Charge Pending
V
BAT
V
CC
CC
> 2V
BAT
Trickle LED =
Low
Trickle
LED = Z
2V
SD2002D.eps
Charge
Pending
V
BAT
V
> 2V
BAT
2V
SD2002T.eps
Figure 3. bq2002T State Diagram
3
bq2002D/T
OSC
Clock
Phase
Generator
TM
INH
Charge-Control
State Machine
Power-On
Reset
CC
Timing
Control
LED
Figure 4. Block Diagram
Note: This resistor-divider network input impedance to end-to-end should be at least 200kand less than 1 MΩ.
A ground-referenced negative temperature coefficient ther mistor placed in proximity to the battery may be used as a low-cost temperature-to-voltage transducer. The tempera ture sense voltage input at TS is developed using a resistor-thermistor network between V
and VSS. See
CC
Figure 1.
Starting A Charge Cycle
Either of two events starts a charge cycle (see Figure 5):
1. Application of power to V
2. Voltage at the BAT pin falling through the maximum cell voltage where
V
If the battery is within the configured temperature and voltage limits, the IC begins fast charge. The valid bat tery voltage range is V ture range is V V
HTF<VTS
HTF<VTS<VLTF
for the bq2002D where
V
LTF
V
= 0.25 VCC±5% (bq2002T only)
HTF
or
CC
=2V±5%
MCV
BAT<VMCV
= 0.4 VCC±5%
. The valid tempera
for the bq2002T and
Sample
History
T/ t
ALU
MCV
Check
BAT
Power
Down
Voltage
Reference
A to D
Converter
V
CC
HTF/
LTF
Check
TCO
Check
V
SS
TS
Bd2002TD.eps
If the battery voltage or temperature is outside of these limits, the IC pulse-trickle charges until the tempera­ture falls within the allowed fast charge range or a new
-
charge cycle is started. Fast charge continues until termination by one or more of
­the four possible termination conditions:
n
Rate of temperature rise
n
Maximum voltage
n
Maximum temperature
n
Maximum time
T/ t Termination
The bq2002D/T samples at the voltage at the TS pin ev ery 19s and compares it to the value measured three samples earlier. If the voltage has fallen 25.6mV or more, fast charge is terminated. The T/t termination
-
test is valid only when V
-
bq2002T and V
TCO<VTS
TCO<VTS<VLTF
for the bq2002D.
Temperature Sampling
A sample is taken by averaging together 16 measure ments taken 57µs apart. The resulting sample period (18.18ms) filters out harmonics around 55Hz. This tech
-
for the
-
-
4
bq2002D/T
Fast ChargingVCC = 0
CC Output
Charge initiated by application of power
LED
Top-Off
(optional,
bq2002T only)
286
4576
Figure 5. Charge Cycle Phases
nique minimizes the effect of any AC line ripple that may feed through the power supply from either 50Hz or 60Hz AC sources. Tolerance on all timing is ±20%.
Maximum Voltage,Temperature,and Time
Any time the voltage on the BAT pin exceeds the maxi­mum cell voltage, V
, fast charge or optional top-off
MCV
charge is terminated.
Table 1. Fast-Charge Safety Time/Top-Off Table
Pulse-Trickle
See
Table 1
286
s
s
s
Charge initiated by battery replacement
Fast Charging
(optional,
bq2002T only)
TD2002F1.eps
Maximum temperature termination occurs anytime the voltage on the TS pin falls below the temperature cut-off threshold V
TCO
where
V
= 0.225 VCC±5%
TCO
Maximum charge time is configured using the TM pin. Time settings are available for corresponding charge rates of C/4, 1C, and 2C. Maximum time-out termina­tion is enforced on the fast-charge phase, then reset, and
Typical Fast-Charge
and Top-Off
Part No.
Corresponding
Fast-Charge Rate TM
Time Limits
C/4 Mid 440 None None None
bq2002D
1C Low 110 None None None 2C High 55 None None None
C/4 Mid 320 C/64 C/256 18.3
bq2002T
1C Low 80 C/16 C/256 73.1 2C High 40 None C/128 73.1
Notes: Typical conditions = 25°C, VCC= 5.0V
Mid = 0.5*V
CC
±0.5V
Tolerance on all timing is ±20%
(minutes)
Pulse-
Top-Off
Rate
Pulse-
Trickle Rate
Trickle
Period (ms)
5
bq2002D/T
enforced again on the top-off phase, if selected (bq2002T only). There is no time limit on the trickle-charge phase.
Top-off Charge—bq2002T Only
An optional top-off charge phase may be selected to follow fast charge termination for 1C and C/4 rates. This phase may be necessary on NiMH or other bat tery chemistries that have a tendency to terminate charge prior to reaching full capacity. With top-off en abled, charging continues at a reduced rate after fast-charge termination for a period of time selected by the TM pin. (See Table 1.) During top-off, the CC pin is modulated at a duty cycle of 286µs active for every 4290µs inactive. This modulation results in an average rate 1/16th that of the fast charge rate. Maxi mum voltage, time, and temperature are the only ter mination methods enabled during top-off.
Pulse-TrickleCharge—bq2002T Only
Pulse-trickle is used to compensate for self-discharge while the battery is idle in the charger. The battery is pulse-trickle charged by driving the CC pin active for a period of 286µs for every 72.9ms of inactivity for 1C and 2C selections, and 286µs for every 17.9ms of inactivity for C/4 selection. This results in a trickle rate of C/256 for the top-off enabled mode and C/128 otherwise.
TM Pin
The TM pin is a three-level pin used to select the charge timer, top-off, voltage termination mode, trickle rate, and voltage hold-off period options. Table 1 describes the states selected by the TM pin. The mid-level selection input is developed by a resistor divider between V on TM at V
/2 ± 0.5V. See Figure 5.
CC
and ground that fixes the voltage
CC
Charge Status Indication
In the fast charge and charge pending states, and when ever the inhibit pin is active, the LED LED
pin is driven to the high-Z state for all other condi tions. Figure 3 outlines the state of the LED charge.
-
Charge Inhibit
Fast charge and top-off may be inhibited by using the
­INH pin. When high, INH suspends all fast charge and top-off activity and the internal charge timer. INH freezes the current state of LED moved. Temperature monitoring is not affected by the INH pin. During charge inhibit, the bq2002D/T contin ues to pulse-trickle charge the battery per the TM selec
­tion. When INH returns low, charge control and the
­charge timer resume from the point where INH became
active. The V
sample history is cleared by INH.
TS
pin goes low. The
pin during
until inhibit is re
Low-Power Mode
The IC enters a low-power state when V above the power-downthreshold(V
V
PD=VCC
Both the CC pin and the LED high-Z state. The operating current is reduced to less than 1µA in this mode. When V below V new charge cycle begins.
, the IC pulse-trickle charges until the next
PD
PD
- (1V ±0.5V) pin are driven to the
BAT
BAT
) where
returns to a value
-
-
-
-
-
is driven
6
bq2002D/T
Absolute Maximum Ratings
Symbol Parameter Minimum Maximum Unit Notes
V
CC
V
T
T
OPR
T
STG
T
SOLDER
T
BIAS
VCCrelative to V
SS
DC voltage applied on any pin excluding V
relative to V
CC
SS
-0.3 +7.0 V
-0.3 +7.0 V
Operating ambient temperature 0 +70 °C Commercial Storage temperature -40 +85 °C Soldering temperature - +260 °C 10s max. Temperature under bias -40 +85 °C
Note: Permanent device damage may occur if Absolute Maximum Ratings are exceeded. Functional opera
tion should be limited to the Recommended DC Operating Conditions detailed in this data sheet. Expo sure to conditions beyond the operational limits for extended periods of time may affect device reliability.
DC Thresholds (T
= 0 to 70°C; V
A
CC
20%)
±
Symbol Parameter Rating Tolerance Unit Notes
V
V
V
V
V
TCO
HTF
LTF
MCV
Temperature cutoff
High-temperature fault
Low-temperature fault
0.225*V
0.25 V
0.4 V
CC
CC
CC
±5%
±5%
±5%
Maximum cell voltage 2 ±5% V
TS
V
and top-off
V
VTS≤ V V
TS
V
(bq2002T only) V
BAT
charge
V
V
terminates fast charge
TCO
inhibits fast charge start
HTF
inhibits fast charge start
LTF
V
inhibits/terminates fast
MCV
-
-
7
bq2002D/T
Recommended DC Operating Conditions (T
= 0 to 70°C)
A
Symbol Condition Minimum Typical Maximum Unit Notes
V
CC
V
BAT
V
TS
Supply voltage 4.0 5.0 6.0 V Battery input 0 - V Thermistor input 0.5 - V
CC
CC
V VVTS< 0.5V prohibited
Logic input high 0.5 - - V INH
V
IH
V
IM
Logic input high V
Logic input mid
- 0.5 - - V TM
CC
V
CC
- 0.5
2
-
V
CC
05+ .
2
VTM
Logic input low - - 0.1 V INH
V
IL
Logic input low - - 0.5 V TM
V
OL
V
PD
Logic output low - - 0.8 V LED,CC, IOL= 10mA
max. powers
V
V
BAT
PD
BAT<VPD
min. =
Power down
- 1.5
V
CC
-
VCC- 0.5
down bq2002D/T;
V
V normal operation.
Outputs unloaded,
A
I
CC
I
SB
Supply current - - 500
Standby current - - 1
µ
V
= 5.1V
CC
AVCC= 5.1V,V
µ
BAT=VPD
I
OL
I
L
I
OZ
LED, CC sink 10 - - mA @VOL=VSS+ 0.8V Input leakage - ­Output leakage in
high-Z state
Note: All voltages relative to VSS.
-5 - -
8
1
±
A INH, CC,V=VSSto V
µ
A
µ
LED
,CC
CC
bq2002D/T
Impedance
Symbol Parameter Minimum Typical Maximum Unit
R
BAT
R
TS
Battery input impedance 50 - - M TS input impedance 50 - - M
Timing (T
Symbol Parameter Minimum Typical Maximum Unit Notes
d
FCV
Note: Typical is at TA= 25°C, VCC= 5.0V.
= 0 to +70°C; V
A
Time-base variation -20 - 20 %
CC
10%)
±
9
bq2002D/T
8-Pin DIP(PN
E1
E
e
)
D
L
C
8-Pin SOIC Narrow (SN)
8-Pin PN(0.300" DIP
Dimension
A 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
A
A1
S
B1
B
G
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
Min. Max. Min. Max.
)
Inches Millimeters
10
8-Pin SN(0.150" SOIC
Inches Millimeters
Dimension
A 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
Min. Max. Min. Max.
)
bq2002D/T
Data Sheet Revision History
Change No. Page No. Description Nature of Change
13
1 5 Added top-off values.
2 All Revisedand expanded this data sheet 3 All Revisedand included bq2002D Addition of device 4 Specified package information for the bq2002D
51,5
Notes: Change 1 = Sept. 1996 B changes from Aug. 1994.
Ordering Information
Was: Table 1 gave the bq2002D/T Operational Summary. Is: Figure 2 gives the bq2002D/T Operational Summary.
Corrected transposed rows in Selection Guide Table and made Table 1 consistent with Selection Guide.
Changed table to figure.
Added column and val ues.
-
bq2002
Package Option:
PN = 8-pin plastic DIP SN = 8-pin narrow SOIC*
Device:
D = bq2002D Fast-Charge IC T = bq2002T Fast-Charge IC
* bq2002D is only available in the 8-pin narrow SOIC package
11
PACKAGE OPTION ADDENDUM
www.ti.com
30-Mar-2005
PACKAGING INFORMATION
Orderable Device Status
(1)
Package
Type
Package Drawing
Pins Package
Qty
Eco Plan
BQ2002DSN ACTIVE SOIC D 8 75 Pb-Free
BQ2002DSNTR ACTIVE SOIC D 8 2500 Pb-Free
BQ2002TPN ACTIVE PDIP P 8 50 Pb-Free
BQ2002TPNE4 ACTIVE PDIP P 8 50 Pb-Free
BQ2002TSN ACTIVE SOIC D 8 75 Pb-Free
BQ2002TSNTR ACTIVE SOIC D 8 2500 Pb-Free
(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.
(RoHS)
(RoHS)
(RoHS)
(RoHS)
(RoHS)
(RoHS)
(2)
Lead/Ball Finish MSL Peak Temp
CU NIPDAU Level-2-260C-1YEAR/
Level-1-220C-UNLIM
CU NIPDAU Level-2-260C-1YEAR/
Level-1-220C-UNLIM
CU NIPDAU Level-NC-NC-NC
CU NIPDAU Level-NC-NC-NC
CU NIPDAU Level-2-260C-1YEAR/
Level-1-220C-UNLIM
CU NIPDAU Level-2-260C-1YEAR/
Level-1-220C-UNLIM
(3)
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined. 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 (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
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Addendum-Page 1
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