TEXAS INSTRUMENTS bq2000T Technical data

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bq2000T

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

➤

∆T/∆t minimum current
(Li-Ion), maximum tempera
ture, 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 bq2000T 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
bq2000T detects the battery chemis
try and proceeds with the optimal
charging and termination algorithms.
This process eliminates undesirable
undercharged or overcharged condi
tions and allows accurate and safe
termination of fast charge.

­Depending on the chemistry, the

bq2000T provides a number of
charge termination criteria:

Rate of temperature rise, ∆T/∆t (for

n

NiCd and NiMH)

n Minimum charging current (for

Li-Ion)

n

Maximum temperature

n

Maximum charge time

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 com
parator allows the bq2000T to be the

-

basis for a complete, high-efficiency
power-conversion circuit for both
nickel-based and lithium-based
chemistries.

-

Pin Connections

SNS

V

SS

LED

BAT

SLUS149A–FEBRUARY 2000

1

2

3

4

8-Pin DIP or Narrow SOIC

or TSSOP

8

7

6

5

PN-2000.eps

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

bq2000T

Pin Descriptions

SNS

V

SS

LED

BAT

TS

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

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.

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.

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

V

CC

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.

TS

BAT

RC

Voltage

Reference

∆T/∆t

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

BD2000T.eps

bq2000T

Sleep
Mode

Charge

Suspended

Battery

Conditioning

4.0V < V

< V

V

P

L

S

T

A

B

< 6.0V

C

C

Charge

Initialization

Battery Voltage

V

V

C

M

P

L

S

T

A

B

< V

< V

(checked at all times)

< V

< V

V

P

L

S

> V

V

S

T

< V

V

S

T

V

A

B

V

S

T

V

B

L

V

T

H

C

C

T

A

B

< V

V

F

T

H

< V

T

> V

< V

T

A

< V

F

Battery Temperature

F

T

H

(checked at all times)

or

T

A

B

L

F

T

L

and

< V

V

C

M

T

A

B

< V

F

T

L

S

T

V

C

M

T

A

B

< V

< V

V
V

∆T/∆t (after hold-off period),
or V
Time = MTO

T

A

B

T

A

B

L

< V

< V

T

L

S

T

F

T

H

or

< V

O

C

T

S

T

and

V

C

M

F

Current

Regulation

Time < MTO

and

> V

V

M

T

A

B

V

C

V

C

C

Reset

Maintenance

Charge

No

Top-Off

Selected?

Yes

Time = MTO or

< V

V

O

C

T

S

T

Reset or Battery Replacement or Capacity Depletion (Li-Ion)

V

C

C

Top-Off

>

V

T

A

B

>

V

T

A

B

Figure 2. State Diagram

3

Voltage

Regulation

Current Taper

or

Time = MTO

V

V

C

M

Done

V

V

C

M

SD2000T.eps

bq2000T

Initiation and Charge Qualification

The bq2000T 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 bq2000T charge qualifi
cation is based on battery voltage and temperature. If
voltage on pin BAT is less than the internal threshold,
V

, the bq2000T enters the charge-pending state.

LBAT

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
indicating the pending status of the charger.

Similarly, the bq2000T 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 bq2000T detects the battery chemistry by monitor
ing the battery-voltage profile during fast charge. If the
voltage on BAT input rises to the internal V

MCV

ence, 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 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 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

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

refer

-

-

-

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 (∆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)

bq2000T

with a trickle maintenance-charge that continues as
long as the voltage on pin BAT remains below V

MCV

.

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 V

BAT

rises to V

MCV

. The
bq2000T 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 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.

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 R
time (MTO) for the bq2000T:

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 bq2000T 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 bq2000T 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.

∆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 sam
ples earlier. This feature terminates fast charge if this
voltage declines at a rate of

V

CC











161VMin



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.

Initial Hold-Off Period

-

The values of the external resistor and capacitor con
nected 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

V

SS

bq2000T

7

V

CC

C

MTO

6

RC

R

MTO

F2000T RCI.eps

Figure 4. Typical Connection for the RC Input

V

CC

2

V

SS

bq2000T

7

V

CC

R

T1

5

TS

N

R

T2

Battery

T

Pack

C

F2000TTMC.eps

Figure 5. Temperature Monitoring Configuration

R

B1

R

B2

F2000TBVD.eps

BAT+

2

V

SS

bq2000T

4

BAT

Figure 6. Battery Voltage Divider

6

bq2000T

programmed value of the maximum charge time divided
by 32.

hold-off period =

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
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 toler
ance 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 bq2000T trickle-charges the bat
tery 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

MTO

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

MTO

tolerance of the pulsewidth below 150kΩ 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 (V

) or if the temperature

MCV

exceeds the high-temperature fault threshold (V

1

that

16

, which is on

. The typical

).

HTF

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,
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 bq2000T switches the MOD output

SNSHI

high to pass charge current to the battery. When the
SNS voltage is less than V

SNSLO

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 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

where N is the number of cells in series and V
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.

is sized to provide

SNS

):

MAX

SNS

or greater than V

CELL



− 1




MCV

SS

CELL

SNSLO

SNSHI

scales the

and

B1

is the

or

,

160

140

120

100

80

60

40

20

Pulsewidth—ms

4

3

2

1

246810 50 100 150 200 250

R

—kΩ

MTO

Shows Tolerance

2000PNvB3.eps

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

7

MTO

bq2000T

DC+

D3

MMSD914LT

R7
1K

R2

D6

BZT52-C5V1

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

2K

D1

RED

0.1

2. DC input voltage: 9–16V

3. Charge current: 1A

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

D4

S1A

VCC

C3

10UF

C4

0.0022UF

1

SNS

2

VSS

3

LED

4

R10

1.1K

BAT

C2

U1

bq2000T

C6

47UF

C7

4.7PF

MOD
VCC

100K

RC
TS

Q1

R12

C8

1000PF

R13

10.5K

FMMT718

R14

23.2K

R9
120 OHMS

Q3
MMBT3904LT1

R8
220 OHMS

Q2
MMBT3904LT1

D5
MMSD914LT

C9

R1

0.33UF

8
7
6
5

C1

R11

0.1

6.81K

C10

0.01UF

100K

L1

47UH

D2
ZHCS1000

210K

BAT+

R4

C5

10UF

THERM

R6

R3

0.05 OHM

CHEMISTRY

BAT -

R5
200K

221K

Pn1031a02.eps

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

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

bq2000T 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

)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

bq2000T

∗ 35,988

A NiCd or NiMH battery pack consisting of N se­ries-cells may benefit by the selection of the R
be N-1 times larger than the R

B2

value.

value to

B1

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.

Temperature Monitoring

bq2000T compares this voltage against its internal
threshold voltages to determine if charging is safe.
These thresholds are the following:

High-temperature cutoff voltage: V

n

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 V

n

High-temperature fault voltage: V

TCO

.

voltage corresponds to the temperature (HTF) at which
The bq2000T measures the temperature by the voltage
at the TS pin. This voltage is typically generated by a
negative-temperature-coefficient thermistor. The

fast charging is allowed to begin.

n

Low-temperature fault voltage: V

This voltage corresponds to the minimum temperature

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

bq2000T 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

)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

/14

MAX

CC

CC

∗ C

MTO

TCO

HTF

= 0.5 ∗V

LTF

∗ 35,988

= 0.225 ∗ V

CC

= 0.25 ∗ VCCThis

CC

9

bq2000T

Table 4. Temperature-Monitoring Conditions

Temperature Condition Action

V

> V

TS

LTF

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

Terminates fast charge or top-off

(LTF) at which fast charging or top-off is allowed. If the
voltage on pin TS rises above V

the bq2000T

LTF,

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.

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 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

> V

TS

LTF

High impedance

) 1Hz flash

Sleep Mode

The bq2000T 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 bq2000T 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

bq2000T

SLP

2000TCS.eps

. Dur

-

-

10

Figure 9. Current-Sensing Circuit

bq2000T

Absolute Maximum Ratings

Symbol Parameter Minimum Maximum Unit Notes

V

CC

V

T

T

OPR

T

STG

T

SOLDER

Note: Permanent device damage may occur if Absolute Maximum Ratings are exceeded. Functional operation

VCCrelative to V

SS

DC voltage applied on any pin, ex
cluding V

relative to V

CC

SS

-

-0.3 +7.0 V

-0.3 +7.0 V

Operating ambient temperature -20 +70 °C

Storage temperature -40 +125 °C

Soldering temperature - +260 °C 10s max.

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 (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

V

THERM

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

CC

V

V

−

V

MCV

CC

161

50

-50

- 1

- 0.1

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

CC

CC

CC

5% V Voltage at pin TS

±

5% V Voltage at pin TS

±

5% V Voltage at pin TS

±

> V

V

BAT

0.75%

±

5% mV Voltage at pin BAT

±

25%

±

±10

±10

±0.5

±0.02

V

fast charge

V/Min

mV Voltage at pin SNS

mV Voltage at pin SNS

V Applied to pin BAT

V At pin BAT

MCV

inhibits

11

bq2000T

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- 0.2 - - V MOD, IOH= 20mA

Output low - - 0.2 V MOD, LED, IOL= 20mA

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

Data Sheet Revision History

Change No. Page No. Description Nature of Change

1 5 Minimum current termination

1 3 Added state diagram

17

1 8 Figure 8 Schematic updated

110V

29

Note: Change 1 = May 1999 B changes to Final from Jan. 1999 Preliminary data sheet.

Change 2 = February 2000 changes from May 1999 B.

Changed capacitor value for en
abling top-off

, V

HTF

, V

LTF

TCO

Minimum current (for fast charge
termination)

Was: 14%
Is: 7%

Was: 0.13µF

-

Is: 0.26µF

Tolerance updated

Was: I

MAX

Is: I

MAX

/7

/14

bq2000T

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

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.

8-Pin SN(0.150" SOIC

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.

)

Inches Millimeters

)

Inches Millimeters

14

bq2000T

8-Pin TSSOP ~ TS Package Suffix

Millimeters Inches

Dimension

A - 1.10 - 0.043

A1 0.05 0.15 0.002 0.006

B 0.18 0.30 0.007 0.012

C 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).

Min. Max. Min. Max.

15

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Copyright © 2000, Texas Instruments Incorporated

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