TEXAS INSTRUMENTS bq2000 Technical data

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bq2000

Programmable Multi-Chemistry

Fast-Charge Management IC

Features

Safe management of fast

➤

charge for NiCd, NiMH, or Li­Ion battery packs

High-frequency switching con

➤

troller for efficient and simple
charger design

Pre-charge qualification for

➤

detecting shorted, damaged, or
overheated cells

Fast-charge termination by

➤

peak voltage (PVD), minimum
current (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

➤

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

n

NiMH)

n Minimum charging current (f or

Li-Ion)

n

Maximum temperature

n

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

or TSSOP

8

7

6

5

PN-2000.eps

SNS

V

LED

BAT

SLUS138B–FEBRUARY 2001 F

1

2

SS

3

4

8-Pin DIP or Narrow SOIC

MOD

V

CC

RC

TS

Pin Names

SNS Current-sense input
V

SS

LED

BAT Battery-voltage

System ground
Charge-status

output

input

1

TS Temperature-sense

RC Timer-program input
V

CC

MOD Modulation-control

input

Supply-voltage input

output

bq2000

Pin Descriptions

SNS

V

SS

LED

BAT

TS

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

System Ground
Charge-status output

Open-drain output that indicates the charg
ing status by turning on, turning off, or
flashing an external LED

Battery-voltage input

Battery-voltage sense input. A simple resistive
divider, across the battery terminals, generates
this input.

T emperature-senseinput

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

-

-

V

CC

MOD

rate during the charge cycle, and to disable
or enable top-off charge

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 bq2000 is a versatile, multi-chemistry battery­charge control device. See Figure 1 for a functional block
diagram and Figure 2 for a state diagram.

TS

BAT

RC

Voltage

Reference

PVD
ALU

Timer

OSC

ADC

Clock

Phase

Generator

Internal

OSC

Figure 1. Functional Block Diagram

2

SNS

Voltage

Comparator

Charge
Control

Voltage

Comparator

V

CCVSS

LED

MOD

bq2000BD.eps

bq2000

Figure 2. State Diagram

3

bq2000

Initiation and ChargeQualification

The bq2000 initiates a charge cycle when it detects

Application of power to V

n

Battery replacement

n

Exit from sleep mode

n

Capacity depletion (Li-Ion only)

n

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,
V

, the bq2000 enters the charge-pending state. This

LBAT

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 “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
indicating the pending status of the charger.

Similarly, the bq2000 suspends fast charge if the battery
temperature is outside the V

4.) For safety reasons, however, it disables the pulse
trickle, in the case of a battery over-temperature condition
(i.e., V

TS<VHTF

). Fast charge begins when the battery

temperature and voltage are valid.

CC

pin blinks at a 1Hz rate,

LTF

to V

range. (See Table

HTF

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 V

reference, the IC assumes a Li-Ion battery.

MCV

Otherwise the bq2000 assumes NiCd/NiMH chemistry.
As shown in Figure 6, a resistor voltage-divider between

the battery pack’s positive terminal and V

scales the

SS

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 NiMHBatteries

Following qualification, the bq2000 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 with a
trickle maintenance-charge that continues as long as
the voltage on pin BATremainsbelowV

MCV

.

-

-

I

MAX

Trickle

I

MIN

Current

Voltage

Qualification

Fast Charge

Phase 1 Phase 2

Current

Time

Figure 3. Lithium-Ion Charge Algorithm

4

GR2000CA.eps

V

MCV

V

LBAT

Voltage

Table 1. Charge Algorithm

Battery Chemistry Charge Algorithm

1. Charge qualification

2. Trickle charge, if required

NiCd or NiMH

Li-Ion

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)

bq2000

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 V

BAT

rises to V

MCV

. The
bq2000 then moves to phase two, regulates the battery
with constant voltage of V
charging current falls below the I

, and terminates when the

MCV

threshold. A new

MIN

charge cycle is started if the cell voltage falls below the
V

threshold.

RCH

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.

The following equation shows the relationship between
the R
time (MTO) for the bq2000:

MTO is measured in minutes, R
in farads. (Note: R
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

MTO

and C

MTO=R

values and the maximum charge

MTO

∗ C

∗ 35,988

MTO

in ohms, and C

MTO

values also determine

MTO

MTO

MTO

and C

MTO

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 VSSand
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 bq2000 compares the battery
temperature to an internal high-temperature cutoff
threshold, V

. As shown in Table 4, high-temperature

TCO

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 pack’s positive terminal and V
battery voltage measured at pin BAT.

-

For Li-Ion battery packs, the resistor values R
R

are calculated by the following equation:

B2

R

B1
B2

R

V




N

=∗



V

CELL

MCV






where N is the number of cells in series and V
manufacturer-specified charging voltage. The end-to­end 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 series­cells may benefit by the selection of the R
N-1 times larger than the R

B2

value.

In a mixed-chemistry design, a common voltage-divider
is used as long as the maximum charge voltage of the

− 1

SS

CELL

value to be

B1

scales the

and

B1

is the

5

bq2000

2

V

SS

bq2000

7

V

CC

C

MTO

6

RC

R

MTO

F2000 RCI.eps

Figure 4. Typical Connection for the RC Input

V

CC

2

V

SS

bq2000

7

V

CC

R

T1

5

TS

N

R

T2

Battery

T

C

F2000TMC.eps

Pack

Figure 5. Temperature Monitoring Configuration

R

B1

R

B2

BAT+

F2000BVD.eps

2

V

SS

bq2000

4

BAT

Figure 6. Battery Voltage Divider

6

bq2000

nickel-based pack is below that of the Li-Ion pack. Oth
erwise, different scaling is required.

Minimum Current (Li-IonOnly)

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.

hold-off period =

maximum time -out

32

Top-Off andPulse-TrickleCharge

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
C

connected to pin RC (Figure 4) should be greater

MTO

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.

-

Once enabled, the top-off is performed over a period
equal to the maximum charge time at a rate of
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 R

, connected to

MTO

pin RC. Figure 7 shows the relationship between the
trickle pulse-width and the value of R

. The typical

MTO

tolerance of the pulsewidth below 150kΩ is ±10%.
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 (V

) or if the temperature

MCV

exceeds the high-temperature fault threshold (V

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,
R

, in series with the battery pack. See Figure 9 for a

SNS

typical current-sensing circuit. R
the desired fast-charge current (I

0.05

=

I

MAX

R

If the voltage at the SNS pin is greater than V
less than V

, the bq2000 switches the MOD output

SNSHI

high to pass charge current to the battery. When the

is sized to provide

SNS

):

MAX

SNS

1

16

HTF

SNSLO

that

-

).

or

200

180

160

140

120

100

80

60

40

20

Pulsewidth—ms

4

3

2

1

246810 50 100 150 200 250

R

MTO

Shows Tolerance

—kΩ

2000PNvB3.eps

Figure 7. Relationship Between Trickle Pulse-Width and Value of R

7

MTO

bq2000

DC+

D6

BZT52-C5V1

MMSD914LT

R2
2K

D1

RED

1000PF

R5
20K

FMMT718

C9

Q1

R12
120 OHMS

Q3
MMBT3904LT1

R11

220 OHMS

D4

R8

6.81K

Q2
MMBT3904LT1

D5
MMSD914LT

R4

12.4K

R10
1K

S1A

VCC

C3

10UF

C2

0.1

R13

1.1K

D3

1
2
3
4

C4

0.0022UF

U1

SNS
VSS
LED
BAT

bq2000

C6

47UF

C7

4.7PF

MOD
VCC

RC
TS

R1

100K

C8

0.33UF

8
7
6
5

C1

0.1

L1

47UH

D2
ZHCS1000

R6
210K

R7
200K

10UF

C5

221K

R9

THERM

R3

0.05 OHM

BAT+

CHEMISTRY

-

BAT

NOTES: 1. For Li-Ion, the CHEMISTRY is left floating.
For NiCd/NiMH, the CHEMISTRY is tied to BAT-

2. DC input voltage: 9–16V

3. Charge current: 1A

4. L1: 3L Global P/N PKSMD-1005-470K-1A

Figure 8. Single-Cell Li-Ion, Three-Cell NiCd/NiMH 1A Charger

Pn1031a01.eos

8

Table 2. Summary of NiCd or NiMH Charging Characteristics

Parameter Value*

Maximum cell voltage (V
Minimum pre-charge qualification voltage (V
High-temperature cutoff voltage (V
High-temperature fault voltage (V
Low-temperature fault voltage (V
bq2000 fast-charge maximum time out (MTO)
Fast-charge charging current (I
Hold-off period MTO/32
Top-off charging current (optional) I
Top-off period (optional) MTO
Trickle-charge frequency 1Hz
Trickle-charge pulse-width See Figure 7

*Please refertoDC Thresholds Specification for details.

)2V

MCV

) 950mV

LBAT

)

TCO

)

HTF

)

LTF

) 0.05/R

MAX

0.225 ∗ V

0.25 ∗ V

0.5 ∗ V

CC

∗ C

R

MTO

SNS

/16

MAX

CC

CC

MTO

bq2000

∗ 35,988

SNS voltage is less than V
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

or greater than V

SNSLO

SNSHI

,

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:

n

High-temperature cutoff voltage: V
This voltage corresponds to the maximum

temperature (TCO) at which fast charging is allowed.
The bq2000 measures the temperature by the voltage at
the TS pin. This voltage is typically generated by a neg-

The bq2000 terminates fast charge if the voltage on

pin TS falls below V

TCO

.

Table 3. Summary of Li-Ion Charging Characteristics

Parameter Value*

Maximum cell voltage (V
Minimum pre-charge qualification voltage (V
High-temperature cutoff voltage (V
High-temperature fault voltage (V
Low-temperature fault voltage (V
bq2000 fast-charge maximum time-out (MTO)
Fast-charge charging current (I
Hold-off period MTO/32
Minimum current (for fast-charge termination) I
Trickle-charge frequency (before fast charge only) 1Hz
Trickle-charge pulse-width (before fast charge only) See Figure 7

*Please refer to DC Thresholds Specification for details.

)2V

MCV

) 950mV

LBAT

LTF

MAX)

TCO

HTF

)

)

)

0.225 ∗ V

0.25 ∗ V

0.5 ∗ V

CC

2 ∗ R

MTO

0.05/R

SNS

/7

MAX

CC

CC

∗ C

MTO

= 0.225 ∗ V

TCO

∗ 35,988

CC

9

bq2000

Table 4. Temperature-Monitoring Conditions

Temperature Condition Action

V

TS>VLTF

V

HTF<VTS<VLTF

V

TS<VHTF

V

TS<VTCO

Cold battery—checked at all times

Optimal operating range Allows charging
Hot battery—checked during charge quali

fication and top-off and trickle-charge
Battery exceeding maximum allowable

temperature—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

Suspends fast-charge initiation, does not allow

-

trickle charge—LED flashes at 1Hz rate during
pre-charge qualification and fast charge

Terminates fast charge or top-off

High-temperature fault voltage: V

n

= 0.25 ∗ VCCThis

HTF

voltage corresponds to the temperature (HTF) at which
fast charging is allowed to begin.

Low-temperature fault voltage: V

n

LTF

= 0.5 ∗ V

CC

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 V

LTF,

the bq2000
suspends fast charge or top-off but does not terminate
charge. When the voltage falls back below V

LTF,

fast
charge or top-off resumes from the point where
suspended. Trickle-charge is allowed during this
condition.

Table4 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.

Table 5. Charge Status Display

Charge Action State LED Status

Battery absent High impedance
Pre-charge qualification 1Hz flash
Trickle charge (before fast charge) 1Hz flash
Fast charging Low
Top-off or trickle (after fast charge,

NiCd, NiMH only)
Charge complete High impedance
Sleep mode High impedance
Charge suspended (V

TS>VLTF

High impedance

) 1Hz flash

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, V
ing sleep mode, the bq2000 shuts down all internal cir­cuits, drives the LED output to high-impedance state,
and drives pin MOD to low. Restoring BAT below the
V

threshold initiates the IC and starts a fast-charge

MCV

cycle.

R

BAT-

Power Supply ground

bq2000 ground

f

R

SNS

1

SNS

C

f

2

V

SS

Figure 9. Current-Sensing Circuit

bq2000

2000CS.eps

SLP

. Dur

-

-

10

bq2000

Absolute Maximum Ratings

Symbol Parameter Minimum Maximum Unit Notes

V

CC

V

T

T

OPR

T

STG

T

SOLDER

VCCrelative to V

DC voltage applied on any pin, ex
cluding V

relative to V

CC

SS

-

SS

Operating ambient temperature -20 +70 °C
Storage temperature -40 +125 °C
Soldering temperature - +260 °C 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.

-0.3 +7.0 V

-0.3 +7.0 V

DC Thresholds (T

A=TOPR;VCC

=5V±20% unless otherwise specified)

Symbol Parameter Rating Tolerance Unit Notes

V

TCO

V

HTF

V

LTF

V

MCV

V

LBAT

PVD BAT input change for PVD detection 3.8
V

SNSHI

V

SNSLO

V

SLP

V

RCH

Temperature cutoff 0.225*V
High-temperature fault 0.25 * V
Low-temperature fault 0.5*V

Maximum cell voltage 2.00
Minimum cell voltage 950

High threshold at SNS, resulting in
MOD-low

Low threshold at SNS, resulting in
MOD-high

Sleep-mode input threshold
Recharge threshold

V

V

MCV

CC

50

-50

-1

- 0.1

CC

CC

CC

5% V Voltage at pin TS

±

5% V Voltage at pin TS

±

5% V Voltage at pin TS

±

V

0.75%

±

5% mV Voltage at pin BAT

±

20% mV

±

±10

±10

mV Voltage at pin SNS

mV Voltage at pin SNS

±0.5

±0.02

BAT>VMCV

V

fast charge

V Applied to pin BAT
V At pin BAT

inhibits

11

bq2000

Recommended DC Operating Conditions (T

A=TOPR)

Symbol Condition Minimum Typical Maximum Unit Notes

V
I
I
V
V
V

I

I
R
C

CC

CC

CCS

TS

OH

OL

OZ

snk

MTO

MTO

Supply voltage 4.0 5.0 6.0 V
Supply current - 0.5 1 mA Exclusive of external loads
Sleep current - - 5
Thermistor input 0.5 - V

CC

V

µA

BAT=VSLP

VVTS< 0.5V prohibited
Output high VCC- 0.6 - - V MOD, IOH= 10mA
Output low - - 0.2 V MOD, LED, IOL= 10mA
High-impedance leakage

current

--5µALED

Sink current - - 20 mA MOD, LED
Charge timer resistor 2 - 250 k
Charge timer capacitor 0.001 - 1.0

Ω

µF

Note: All voltages relative to VSSexcept as noted.

Impedance

Symbol Parameter Minimum Typical Maximum Unit

R

BAT

R

TS

R

SNS

Timing (T

Battery input impedance 10 - - M
TS input impedance 10 - - M
SNS input impedance 10 - - M

A=TOPR;VCC

=5V±20% unless otherwise specified)

Symbol Parameter Minimum Typical Maximum Unit

d

MTO

f

TRKL

MTO time-base variation -5 - +5 %
Pulse-trickle frequency 0.9 1.0 1.1 Hz

12

Ω

Ω

Ω

bq2000

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

13

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.

)

bq2000

8-Pin TSSOP (PW)

14

Data Sheet Revision History

Change No. Page No. Description Nature of Change

1 4 MTO equation

16

Trickle-pulse width

equation
1 7 Figure 7 Schematic updated
110V
111R
28V

TCO,VHTF,VLTF
MTO,CMTO
LBAT

3 1, 13 Package option Added TSSOP
3 3 State diagram Added
3 8 Schematic updated
311V

TSO,VHTF,VLTF

3 7 Top-off charge Updatedrequirement for enabling top-off
4 7 Figure 7 Updated tolerance on the curve

412

412

V

OH

V

OL

5 3 Figure 2

5 3 Figure 2

6 14 Change package

515

Change ordering

information

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

Was:MTO = R ∗ C ∗ 71,976
Is: MTO = R

MTO

∗ C

MTO

∗ 35,988

Replaced equation with Figure 6

Tolerance updated
Values updated
Corrected values in Tables 2 and 3

Tolerance updated

Was:Minimum VOH=VCC- 0.2 at IOH= 20mA
Is: Minimum V

OH=VCC

- 0.6 at IOH= 10mA

Was:IOH= 20mA
Is: I

= 10mA

OH

Battery voltage detail was: (checked at all times)
Is: Voltage regulation checked constantly. PVD checked at rate
of MTO/64.

Battery temperature detail was: (checked at all times)
Is: (checked 1,750 times per second)

Was:8-Pin TSSOP ∼ TS Package Suffix
Is: 8-Pin PSOP

Was:TS = 8-pin TSSOP
Is: PW = 8-pin TSSOP

bq2000

15

bq2000

Ordering Information

bq2000

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

16

PACKAGE OPTION ADDENDUM

www.ti.com

4-Mar-2005

PACKAGING INFORMATION

Orderable Device Status

(1)

Package

Type

Package

Drawing

Pins Package

Qty

Eco Plan

BQ2000PN-B5 ACTIVE PDIP P 8 50 Pb-Free

BQ2000PW ACTIVE TSSOP PW 8 150 None CU NIPDAU Level-1-220C-UNLIM

BQ2000PWR ACTIVE TSSOP PW 8 2000 None CU NIPDAU Level-1-220C-UNLIM

BQ2000SN-B5 ACTIVE SOIC D 8 75 None CUSNPB Level-1-220C-UNLIM

BQ2000SN-B5TR ACTIVE SOIC D 8 2500 None CUSNPB 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 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.

(RoHS)

(2)

Lead/Ball Finish MSL Peak Temp

CU SNPB Level-NC-NC-NC

(3)

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDECindustry standard classifications, and peak solder

temperature.

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Addendum-Page 1

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