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Programmable Multi-Chemistry
Fast-Charge Management IC
Features
ā? Safe management of fast charge for NiCd, NiMH, or Li- Ion battery packs
ā? High-frequency switching con- troller for efficient and simple charger design
ā? Pre-charge qualification for detecting shorted, damaged, or overheated cells
ā? Fast-charge termination by peak voltage (PVD), minimum current (Li-Ion), maximum temperature, and maximum charge time
ā? Selectable top-off mode for achieving maximum capacity in NiMH batteries
ā? Programmable trickle-charge mode for reviving deeply dis- charged batteries and for post- charge maintenance
ā? Built-in battery removal and insertion detection
ā? Sleep mode for low power consumption
General Description
The bq2000 is a programmable, monolithic IC for fast-charge manage- ment of nickel cadmium (NiCd), nickel metal-hydride (NiMH), or lith- ium-ion (Li-Ion) batteries in single- or multi-chemistry applications. The bq2000 detects the battery chemistry and proceeds with the optimal charg- ing and termination algorithms. This process eliminates undesirable under- charged or overcharged conditions and allows accurate and safe termi- nation of fast charge.
Depending on the chemistry, the bq2000 provides a number of charge termination criteria:
Peak voltage, PVD (for NiCd and
Minimum charging current (f or
Li-Ion)
Maximum temperature
Maximum charge time
For safety, the bq2000 inhibits fast charge until the battery voltage and temperature are within user-defined limits. If the battery voltage is below the low-voltage threshold, the bq2000 uses trickle-charge to condition the battery. For NiMH batteries, the bq2000 provides an optional top-off charge to maximize the battery capacity.
The integrated high-frequency com- parator allows the bq2000 to be the basis for a complete, high-efficiency power-conversion circuit for both nickel-based and lithium-based chemistries.
Pin Connections Pin Names
SNS Current-sense input
VSS System ground
LED Charge-status output
BAT Battery-voltage input
TS Temperature-sense input
RC Timer-program input
VCC Supply-voltage input
MOD Modulation-control output
8-Pin DIP or Narrow SOIC
or TSSOP
PN-2000.eps
SLUS138BāFEBRUARY 2001 F
Pin Descriptions
SNS Current-sense input
Enables the bq2000 to sense the battery cur- rent via the voltage developed on this pin by an external sense-resistor connected in se- ries with the battery pack
VSS System Ground
LED Charge-status output
Open-drain output that indicates the charg- ing 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 di- vider network with a negative tempera- ture-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 Supply-voltage input
MOD 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 bq2000 is a versatile, multi-chemistry battery- charge control device. See Figure 1 for a functional block diagram and Figure 2 for a state diagram.
Voltage
Reference
Voltage
Comparator
PVD ALU
Clock Phase Generator
Charge
Control
Internal
Voltage
Comparator
VCC VSS
bq2000BD.eps
Figure 1. Functional Block Diagram
Figure 2. State Diagram
Initiation and Charge Qualification
The bq2000 initiates a charge cycle when it detects
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 bq2000 charge qualifica- tion is based on battery voltage and temperature. If voltage on pin BAT is less than the internal threshold, VLBAT, the bq2000 enters the charge-pending state. This condition indicates the possiblility of a defective or shorted battery pack. In an attempt to revive a fully depleted pack, the bq2000 enables the MOD pin to trickle-charge at a rate of once every 1.0s. As explained in the section āTop-Off and Pulse-Trickle Charge,ā?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 bq2000 suspends fast charge if the battery temperature is outside the VLTF to VHTF range. (See Table
4.) For safety reasons, however, it disables the pulse
trickle, in the case of a battery over-temperature condition (i.e., VTS < VHTF). Fast charge begins when the battery temperature and voltage are valid.
Battery Chemistry
The bq2000 detects the battery chemistry by monitoring the battery-voltage profile during the initial stage of the fast charge. If the voltage on BAT input rises to the in- ternal VMCV reference, the IC assumes a Li-Ion battery. Otherwise the bq2000 assumes NiCd/NiMH chemistry.
As shown in Figure 6, a resistor voltage-divider between the battery packās 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. Oth- erwise, different scaling is required.
Once the chemistry is determined, the bq2000 completes the fast charge with the appropriate charge algorithm (Table 1). The user can customize the algorithm by programming the device using an external resistor and a capacitor connected to the RC pin, as discussed in later sections.
NiCd and NiMH Batteries
Following qualification, the bq2000 fast-charges NiCd or NiMH batteries using a current-limited algorithm. Dur- ing the fast-charge period, it monitors charge time, tem- perature, and voltage for adherence to the termination criteria. This monitoring is further explained in later sections. Following fast charge, the battery is topped off, if top-off is selected. The charging cycle ends with a trickle maintenance-charge that continues as long as the voltage on pin BAT remains below VMCV.
Voltage
Fast Charge
Phase 1 Phase 2
Trickle
Current
GR2000CA.eps
Figure 3. Lithium-Ion Charge Algorithm
Table 1. Charge Algorithm
Battery Chemistry
Charge Algorithm
NiCd or NiMH
1. Charge qualification
2. Trickle charge, if required
3. Fast charge (constant current)
4. Charge termination (peak voltage, maximum charge time)
5. Top-off (optional)
6. Trickle charge
1. Charge qualification
2. Trickle charge, if required
3. Two-step fast charge (constant current followed by constant voltage)
4. Charge termination (minimum current, maximum charge time)
Lithium-Ion Batteries
The bq2000 uses a two-phase fast-charge algorithm for Li-Ion batteries (Figure 3). In phase one, the bq2000 regulates constant current until VBAT rises to VMCV. The bq2000 then moves to phase two, regulates the battery with constant voltage of VMCV, and terminates when the charging current falls below the IMIN threshold. A new charge cycle is started if the cell voltage falls below the VRCH threshold.
During the current-regulation phase, the bq2000 monitors charge time, battery temperature, and battery voltage for adherence to the termination criteria. During the final constant-voltage stage, in addition to the charge time and temperature, it monitors the charge current as a termination criterion. There is no post-charge maintenance mode for Li-Ion batteries.
Charge Termination
Maximum Charge Time (NiCD, NiMH, and
Li-Ion)
The bq2000 sets the maximum charge-time through pin RC. With the proper selection of external resistor and capacitor, various time-out values may be achieved. Fig- ure 4 shows a typical connection.
charge. This feature provides the additional charge time required for Li-Ion cells.
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 typi- cal temperature-sensing circuit.
During fast charge, the bq2000 compares the battery temperature to an internal high-temperature cutoff threshold, VTCO. As shown in Table 4, high-temperature termination occurs when voltage at pin TS is less than this threshold.
Peak Voltage (NiCd, NiMH)
The bq2000 uses a peak-voltage detection (PVD) scheme to terminate fast charge for NiCd and NiMH batteries. The bq2000 continuously samples the voltage on the BAT pin, representing the battery voltage, and triggers the peak detection feature if this value falls below the maximum sampled value by as much as 3.8mV (PVD). As shown in Figure 6, a resistor voltage-divider between the battery packās 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:
The following equation shows the relationship between
ļ¦ļ§ ļ VCELL ļ¶ļ· ļ?1
the RMTO and CMTO values and the maximum charge time (MTO) for the bq2000:
MTO = RMTO ļ?CMTO ļ?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 de- tails.)
For Li-Ion cells, the bq2000 resets the MTO when the battery reaches the constant-voltage phase of the
RB2 ļ?ļ?Nļ?VMCV ļ?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 200kļ?and no more than 1Mļ?
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
VCC 7
F2000 RCI.eps
Figure 4. Typical Connection for the RC Input
VSS VCC
N Battery
T Pack
F2000TMC.eps
Figure 5. Temperature Monitoring Configuration
4 BAT
F2000BVD.eps
Figure 6. Battery Voltage Divider
nickel-based pack is below that of the Li-Ion pack. Oth-
Once enabled, the top-off is performed over a period
erwise, different scaling is required.
equal to the maximum charge time at a rate of 1
Minimum Current (Li-Ion Only)
The bq2000 monitors the charging current during the voltage-regulation phase of Li-Ion batteries. Fast charge is terminated when the current is tapered off to 14% of the maximum charging current.
Initial Hold-Off Period
The values of the external resistor and capacitor connected to pin RC set the initial hold-off period. During this period, the bq2000 avoids early termination due to an initial rise in the battery voltage by disabling the peak voltage-detection feature. This period is fixed at the programmed value of the maximum charge time divided by 32.
maximum time - out hold-off period =
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 0.13ļF, and the value of the resistor connected to this pin should be less than 15kļ? To disable top-off, the capacitance value should be less than 0.07ļF. The toler- ance of the capacitor needs to be taken into account in component selection.
of fast charge.
Following top-off, the bq2000 trickle-charges the battery by enabling the MOD to charge at a rate of once every
1.0 second. The trickle pulse-width is user-selectable
and is set by the value of the resistor RMTO, connected to pin RC. Figure 7 shows the relationship between the trickle pulse-width and the value of RMTO. The typical tolerance of the pulsewidth below 150kļ?is ļ?0%.
During top-off and trickle-charge, the bq2000 monitors battery voltage and temperature. These charging func- tions 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 bq2000 controls the charge current through the MOD output pin. The current-control circuit supports a switching-current regulator with frequencies up to
500kHz. The bq2000 monitors charge current at the
SNS input by the voltage drop across a sense-resistor, RSNS, in series with the battery pack. See Figure 9 for a typical current-sensing circuit. RSNS is sized to provide the desired fast-charge current (IMAX):
If the voltage at the SNS pin is greater than VSNSLO or less than VSNSHI, the bq2000 switches the MOD output high to pass charge current to the battery. When the
Shows Tolerance
2 4 6 8 10 50 100 150 200 250
RMTOākļ?2000PNvB3.eps
Figure 7. Relationship Between Trickle Pulse-Width and Value of RMTO
FMMT718
Q2 47UH
MMSD914LT
MMBT3904LT1
MMSD914LT C9
120 OHMS
ZHCS1000
D6 R2
MMBT3904LT1
220 OHMS
BZT52-C5V1
D1 RED
0.0022UF
4.7PF R1
1 SNS
2 VSS
3 LED
4 BAT
MOD 8
VCC 7
bq2000
CHEMISTRY
1.1K R3
0.05 OHM
NOTES: 1. For Li-Ion, the CHEMISTRY is left floating.
For NiCd/NiMH, the CHEMISTRY is tied to BAT-
2. DC input voltage: 9ā?6V
3. Charge current: 1A
4. L1: 3L Global P/N PKSMD-1005-470K-1A
Pn1031a01.eos
Figure 8. Single-Cell Li-Ion, Three-Cell NiCd/NiMH 1A Charger
Table 2. Summary of NiCd or NiMH Charging Characteristics
Parameter
Value*
Maximum cell voltage (VMCV)
Minimum pre-charge qualification voltage (VLBAT)
High-temperature cutoff voltage (VTCO)
0.225 ā?VCC
High-temperature fault voltage (VHTF)
0.25 ā?VCC
Low-temperature fault voltage (VLTF)
0.5 ā?VCC
bq2000 fast-charge maximum time out (MTO)
RMTO ā?CMTO ā?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)
Trickle-charge frequency
Trickle-charge pulse-width
See Figure 7
*Please refer to DC Thresholds Specification for details.
SNS voltage is less than VSNSLO or greater than VSNSHI, the bq2000 switches the MOD output low to shut off charging current to the battery. Figure 8 shows a typical multi-chemistry charge circuit.
Temperature Monitoring
The bq2000 measures the temperature by the voltage at the TS pin. This voltage is typically generated by a neg-
ative-temperature-coefficient thermistor. The bq2000 compares this voltage against its internal threshold voltages to determine if charging is safe. These thresholds are the following:
High-temperature cutoff voltage: VTCO = 0.225 ļ?VCC This voltage corresponds to the maximum temperature (TCO) at which fast charging is allowed. The bq2000 terminates fast charge if the voltage on pin TS falls below VTCO.
Table 3. Summary of Li-Ion Charging Characteristics
Parameter
Value*
Maximum cell voltage (VMCV)
Minimum pre-charge qualification voltage (VLBAT)
High-temperature cutoff voltage (VTCO)
0.225 ā?VCC
High-temperature fault voltage (VHTF)
0.25 ā?VCC
Low-temperature fault voltage (VLTF)
0.5 ā?VCC
bq2000 fast-charge maximum time-out (MTO)
2 ā?RMTO ā?CMTO ā?35,988
Fast-charge charging current (IMAX)
0.05/RSNS
Hold-off period
MTO/32
Minimum current (for fast-charge termination)
IMAX/7
Trickle-charge frequency (before fast charge only)
Trickle-charge pulse-width (before fast charge only)
See Figure 7
*Please refer to DC Thresholds Specification for details.
Table 4. Temperature-Monitoring Conditions
Temperature
Condition
Action
VTS > VLTF
Cold batteryāchecked at all times
Suspends fast charge or top-off and timer Allows trickle chargeāLED flashes at 1Hz rate during pre-charge qualification and fast charge
VHTF < VTS < VLTF
Optimal operating range
Allows charging
VTS < VHTF
Hot batteryāchecked during charge quali- fication and top-off and trickle-charge
Suspends fast-charge initiation, does not allow trickle chargeāLED flashes at 1Hz rate during pre-charge qualification and fast charge
VTS < VTCO
Battery exceeding maximum allowable temperatureāchecked at all times
Terminates fast charge or top-off
High-temperature fault voltage: VHTF = 0.25 ļ?VCC This voltage corresponds to the temperature (HTF) at which fast charging is allowed to begin.
Low-temperature fault voltage: VLTF = 0.5 ļ?VCC
This voltage corresponds to the minimum temperature
(LTF) at which fast charging or top-off is allowed. If the voltage on pin TS rises above VLTF, the bq2000 suspends fast charge or top-off but does not terminate charge. When the voltage falls back below VLTF, fast charge or top-off resumes from the point where suspended. Trickle-charge is allowed during this condition.
Table 4 summarizes these various conditions.
Charge Status Display
The charge status is indicated by open-drain output LED. Table 5 summarizes the display output of the bq2000.
Sleep Mode
The bq2000 features a sleep mode for low power con- sumption. This mode is enabled when the voltage at pin BAT is above the low-power-mode threshold, VSLP. Dur- ing sleep mode, the bq2000 shuts down all internal cir- cuits, 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 5. Charge Status Display
1 SNS Cf
Power Supply ground bq2000 ground
2000CS.eps
Figure 9. Current-Sensing Circuit
Absolute Maximum Ratings
Parameter
Minimum
Maximum
VCC relative to VSS
DC voltage applied on any pin, ex- cluding VCC relative to VSS
Operating ambient temperature
Storage temperature
TSOLDER
Soldering temperature
10s max.
Note: Permanent device damage may occur if Absolute Maximum Ratings are exceeded. Functional operation should be limited to the Recommended DC Operating Conditions detailed in this data sheet. Exposure to conditions beyond the operational limits for extended periods of time may affect device reliability.
DC Thresholds (TA = TOPR; VCC = 5V ļ?0% unless otherwise specified)
Parameter
Rating
Tolerance
Temperature cutoff
0.225 * VCC
Voltage at pin TS
High-temperature fault
0.25 * VCC
Voltage at pin TS
Low-temperature fault
0.5 * VCC
Voltage at pin TS
Maximum cell voltage
VBAT > VMCV inhibits fast charge
Minimum cell voltage
Voltage at pin BAT
BAT input change for PVD detection
High threshold at SNS, resulting in
MOD-low
Voltage at pin SNS
Low threshold at SNS, resulting in
MOD-high
Voltage at pin SNS
Sleep-mode input threshold
VCC - 1
Applied to pin BAT
Recharge threshold
VMCV - 0.1
At pin BAT
Recommended DC Operating Conditions (TA = TOPR)
Condition
Minimum
Typical
Maximum
Supply voltage
Supply current
Exclusive of external loads
Sleep current
VBAT = VSLP
Thermistor input
VTS < 0.5V prohibited
Output high
VCC - 0.6
MOD, IOH = 10mA
Output low
MOD, LED, IOL = 10mA
High-impedance leakage current
Sink current
MOD, LED
Charge timer resistor
Charge timer capacitor
Note: All voltages relative to VSS except as noted.
Impedance
Parameter
Minimum
Typical
Maximum
Battery input impedance
TS input impedance
SNS input impedance
Timing (TA = TOPR; VCC = 5V ļ?0% unless otherwise specified)
Parameter
Minimum
Typical
Maximum
MTO time-base variation
Pulse-trickle frequency
8-Pin DIP (PN)
8-Pin PN (0.300" DIP)
E A B1
8-Pin SOIC Narrow (SN)
8-Pin SN (0.150" SOIC)
Dimension
Inches
Millimeters
8-Pin TSSOP (PW)
Data Sheet Revision History
Change No.
Page No.
Description
Nature of Change
MTO equation
Was: MTO = R ā?C ā?71,976
Is: MTO = RMTO ā?CMTO ā?35,988
Trickle-pulse width equation
Replaced equation with Figure 6
Figure 7
Schematic updated
VTCO, VHTF, VLTF
Tolerance updated
RMTO, CMTO
Values updated
Corrected values in Tables 2 and 3
Package option
Added TSSOP
State diagram
Schematic updated
VTSO, VHTF,VLTF
Tolerance updated
Top-off charge
Updated requirement for enabling top-off
Figure 7
Updated tolerance on the curve
Was: Minimum VOH = VCC - 0.2 at IOH = 20mA Is: Minimum VOH = VCC - 0.6 at IOH = 10mA
Was: IOH = 20mA Is: IOH = 10mA
Figure 2
Battery voltage detail was: (checked at all times)
Is: Voltage regulation checked constantly. PVD checked at rate of MTO/64.
Figure 2
Battery temperature detail was: (checked at all times) Is: (checked 1,750 times per second)
Change package
Was: 8-Pin TSSOP ā?TS Package Suffix
Is: 8-Pin PSOP
Change ordering information
Was: TS = 8-pin TSSOP Is: PW = 8-pin TSSOP
Note: Change 1 = Jan. 1999 B changes to Final from Sept. 1998 Preliminary data sheet.
Change 2 = Mar. 1999 C changes from Jan. 1999 B. Change 3 = May 1999 D changes from Mar. 1999 C. Change 4 = February 2000 E changes from May 1999 D.
Change 5 = February 2001 F changes from February 2000 E
Ordering Information
Package Option:
PN = 8-pin narrow plastic DIP
SN = 8-pin narrow SOIC PW = 8-pin TSSOP
Device:
bq2000 Multi-Chemistry Fast-Charge IC with Peak Voltage
Detection
PACKAGE OPTION ADDENDUM 4-Mar-2005
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Package
Drawing
Package
Eco Plan (2)
Lead/Ball Finish
MSL Peak Temp (3)
BQ2000PN-B5
ACTIVE
Pb-Free
CU SNPB
Level-NC-NC-NC
BQ2000PW
ACTIVE
CU NIPDAU
Level-1-220C-UNLIM
BQ2000PWR
ACTIVE
CU NIPDAU
Level-1-220C-UNLIM
BQ2000SN-B5
ACTIVE
CU SNPB
Level-1-220C-UNLIM
BQ2000SN-B5TR
ACTIVE
CU SNPB
Level-1-220C-UNLIM
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - May not be currently available - please check 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.
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