TEXAS INSTRUMENTS bq2054 Technical data

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bq2054

Lithium Ion Fast-Charge IC

Features

Safe charge of Lithium Ion bat

➤

tery packs

Voltage-regulated current-

➤

limited charging

Fast charge terminated by se

➤

lectable minimum current; safety
backup termination on maximum
time

Charging continuously qualified

➤

by temperature and voltage lim
its

Pulse-width modulation control

➤

ideal for high-efficiency switch­mode power conversion

➤ Direct LED control outputs dis-

play charge status and fault con­ditions

Pin Connections

1

16

ICTL

BAT

VCOMP

ICOMP

I

TERM

SNS

TM

TS

2

3

4

5

6

7

8

16-Pin Narrow

DIP or SOIC

15

14

13

12

11

10

9

PN205401.eps

LED2/DSEL

LED

1

MOD

V

CC

V

SS

LCOM

LED

3

TPWM

General Description

The bq2054 Lithium Ion Fast-

­Charge IC is designed to optimize

charging of lithium ion (Li-Ion)
chemistry batteries. A flexible
pulse-width modulation regulator
allows the bq2054 to control voltage

­and current during charging. The

regulator frequency is set by an ex
ternal capacitor for design flexibility.
The switch-mode design keeps
power dissipation to a minimum.

­The bq2054 measures battery tem

perature using an external thermis
tor for charge qualification. Charging
begins when power is applied or on
battery insertion.

For safety, the bq2054 inhibits
charging until the battery voltage
and temperature are within con-

Pin Names

TM Time-out programming

ICTL

BAT Battery voltage input

VCOMP Voltage loop comp input

ICOMP Current loop comp input

I

TERM

SNS Sense resistor input

TS Temperature sense input

input

Inrush current control
output

Minimum current
termination select input

figured limits. If the battery voltage
is less than the low-voltage thresh
old, the bq2054 provides low-current
conditioning of the battery.

A constant current-charging phase re
plenishes up to 70% of the charge ca
pacity, and a voltage-regulated phase
returns the battery to full. The charge
cycle terminates when the charging

-

current falls below a user-selectable
current limit. For safety, charging ter
minates after maximum time and is
suspended if the temperature is out
side the preconfigured limits.

-

-

The bq2054 provides status indica
tions of all charger states and faults
for accurate determination of the
battery and charge system condi
tions.

TPWM Regulator timebase input

LED

3

Charge status output 3

LCOM Common LED output

V

SS

V

CC

System ground

5.0V±10% power

MOD Modulation control output

LED

LED

1

2

Charge status output 1

/ Charge status output 2/

DSEL Display select input

-

-

-

-

-

-

-

6/99 H

1

bq2054

Pin Descriptions

TM Time-out programming input

This input sets the maximum charge time.
The resistor and capacitor values are deter
mined using Equation 5. Figure 7 shows the
resistor/capacitor connection.

ICTL

BAT Battery voltage input

VCOMP Voltage loop compensation input

I

TERM

ICOMP Current loop compensation input

SNS Charging current sense input

Inrush current control output

is driven low during the fault or

ICTL
charge-complete states of the chip. It is used
to disconnect the capacitor across the battery
pack terminals, preventing inrush currents
from tripping overcurrent protection fea
tures in the pack when a new battery is in
serted.

BAT is the battery voltage sense input. This
potential is generally developed using a
high-impedance resistor divider network
connected between the positive and the
negative terminals of the battery. See Fig­ure 4 and Equation 1.

This input uses an external R-C network for
voltage loop stability.

Minimum current termination select

This three-state input is used to set I
fast charge termination. See Table 2.

This input uses an external R-C network for
current loop stability.

Battery current is sensed via the voltage de
veloped on this pin by an external sense re
sistor, R

, connected in series with the

SNS

negative terminal of the battery pack. See
Equation 6.

MIN

TS Temperature sense input

This input is used to monitor battery tempera
ture. An external resistor divider network sets
the lower and upper temperature thresholds.

-

See Figure 6 and Equations 3 and 4.

TPWM Regulation timebase input

This input uses an external timing capacitor
to ground to set the pulse-width modulation
(PWM) frequency. See Equation 7.

LCOM Common LED output

-

-

Common output for LED
in a high-impedance state during initiali
zation to read programming input on
DSEL.

MOD Current-switching control output

MOD is a pulse-width modulated push/pull
output that is used to control the charging
current to the battery. MOD switches high
to enable current flow and low to inhibit cur­rent flow.

LED

–

Charger display status 1–3 outputs

1

LED

3

These charger status output drivers are for
the direct drive of the LED display. Display
modes are shown in Table 1. These outputs are
tri-stated during initialization so that DSEL
can be read.

for

DSEL Display select input

This three-level input controls the LED
charge display modes. See Table 1.

V

CC

VCCsupply

5.0V,±10% power

V

SS

-

Ground

-

. This output is

1–3

-

-

1–3

2

bq2054

Charge Algorithm

The bq2054 uses a two-phase fast charge algorithm. In
phase 1, the bq2054 regulates constant current (I
I

) until V

MAX

bq2054 then transitions to phase 2 and regulates con
stant voltage (V
falls below the programmed I
ing current must remain below I
ore a valid fast charge termination is detected. Fast
charge then terminates, and the bq2054 enters the
Charge Complete state. See Figures 1 and 2.

(= V

CELL

CELL=VREG

BAT-VSNS

) rises to V

) until the charging current

threshold. The charg

MIN

for 120±40ms bef

MIN

REG

SNS

. The

Charge Qualification

The bq2054 starts a charge cycle when power is applied
while a battery is present or when a battery is inserted.
Figure 2 shows the state diagram for pre-charge qualifi
cation and temperature monitoring. The bq2054 first
checks that the battery temperature is within the al
lowed, user-configurable range. If the temperature is out
of range, the bq2054 enters the Charge Pending state
and waits until the battery temperature is within the al­lowed range. Charge Pending is enunciated by LED
flashing.

I

MAX

Thermal monitoring continues throughout the charge
cycle, and the bq2054 enters the Charge Pending state
when the temperature out of range. (There is one excep
tion; if the bq2054 is in the Fault state—see below—the

=

out-of-range temperature is not recognized until the
bq2054 leaves the Fault state.) All timers are sus

­pended (but not reset) while the bq2054 is in Charge

Pending. When the temperature comes back into range,

­the bq2054 returns to the point in the charge cycle

­where the out-of-range temperature was detected.

When the temperature is valid, the bq2054 then regu
lates current to I
period t
transient voltage spikes that may occur when charge
current is first applied), the chip begins monitoring
V

CELL

expiration of time-out limit t

-

short), the bq2054 enters the Fault state. If V
achieved before expiration of the time limit, the chip be

-

gins fast charging.

Once in the Fault state, the bq2054 waits until V
cycled or a new battery insertion is detected. It then
starts a new charge cycle and begins the qualification

3

process again.

(which prevents the chip from reacting to

HO

.IfV

CELL

(=I

COND

does not rise to at least V

/5). After an initial holdoff

MAX

(e.g. the cell has failed

MTO

MIN

Voltage

before the

MIN

CC

V

REG

-

-

-

is

-

is

I

COND

I

MIN

Current

Qualification

Figure 1. bq2054 Charge Algorithm

Fast Charge

Phase 1 Phase 2

Current

Time

3

GR205401.eps

V

MIN

Voltage

bq2054

V

BAT

Charge

VCC 4.5V

V

< V

LCO

Qualification Test

V

BAT

PASS: V

Fast

< V

BAT

REG

V

Chip On

Present

BAT

< V

>

V

>

V

BAT

< V

MIN

MIN

REG

HCO

Current

Regulation

@ I

COND

Phase 1
I = I

MAX

Temperature

in Range

V

V

t t > t

V

BAT

V

Temperature

Checks On

Battery

Status?

Fail: t = tQT or

< V

BAT

BAT

>

BAT

> V

< V

> V

MTO

LCO

HCO

LCO

HCO

or

Temperature Out

of Range or

Thermistor Absent

V

LED3 =1

or

Absent

< V

BAT

V

BAT > VHCO

Fault

MOD = 0

or

LCO

V

V

Charge

Pending

LED3 flash

MOD = 0

BAT

BAT

V

or

V

LCO

HCO

I

SNS

V

V

> I

BAT

BAT

MIN

V

or

V

I

SNS

>

t t

LCO

HCO

<

I

or

MTO

MIN

Phase 2

V = V

REG

Charge

Complete

V

BAT

V

BAT

< V

> V

LCO

HCO

Figure 2. bq2054 State Diagram

4

Temperature Out

or

of Range or

Thermistor Absent

Temperature In

Range, Return

to Original State

FG205401.eps

bq2054

Charge Status Display

Charge status is enunciated by the LED driver outputs
LED

–LED3. Three display modes are available in the

1

bq2054; the user selects a display mode by configuring
pin DSEL. Table 1 shows the three display modes.

The bq2054 does not distinguish between an over­voltage fault and a “battery absent” condition. The
bq2054 enters the Fault state, enunciated by turning on
LED

, whenever the battery is absent. The bq2054,

3

therefore, gives an indication that the charger is on even
when no battery is in place to be charged.

Configuring the Display Mode and I

DSEL/LED
is an LED driver pin as an output and a programming
pin as an input. The selection of pull-up, pull-down, or
no pull resistor programs the display mode on DSEL per
Table 1. The bq2054 latches the programming data
sensed on the DSEL input when any one of the following
three events occurs:

1. V

2. The bq2054 leaves the Fault state.

rises to a valid level.

CC

3. The bq2054 detects battery insertion.

The LEDs go blank for approximately 750ms (typical)
while new programming data is latched.

Table 1. bq2054 Display Output Summary

Mode Charge Action State LED

Battery absent or over-voltage fault Low Low High

Pre-charge qualification Flash Low Low

DSEL = 0

(Mode 1)

Charge pending (temperature out of range) X X Flash

Battery absent or over-voltage fault Low Low High

DSEL = 1

(Mode 2)

Charge pending (temperature out of range) X X Flash

Battery absent or over-voltage fault Low Low High

Fast charge: current regulation Low High Low

DSEL = Float

(Mode 3)

Fast charge: voltage regulation High High Low

Charge pending (temperature out of range) X X Flash

Note: 1 = VCC; 0 = VSS; X = LED state when fault occurred; Flash =

Fast charging High Low Low

Charge complete Low High Low

Charging fault X X High

Pre-charge qualification High High Low

Fast charge Low High Low

Charge complete High Low Low

Charging fault X X High

Pre-charge qualification Flash Flash Low

Charge complete High Low Low

Charging fault X X High

MIN

is a bi-directional pin with two functions; it

2

1

sec. low,

6

1

1

sec high.

6

LED

2

LED

3

5

bq2054

Fast charge terminates when the charging current drops
below a minimum current threshold programmed by the
value of I

(see Table 2) and remains below that

TERM

level for 120±40ms.

Table 2. I

I

TERM

Float I

Termination Thresholds

MIN

I

MIN

0I

1I

MAX

MAX

MAX

/10

/20

/30

Figure 3 shows the bq2054 configured for display mode 2
and I

MIN=IMAX

/10.

Voltage and Current Monitoring

The bq2054 monitors battery pack voltage at the BAT
pin. The user must implement a voltage divider be­tween the positive and negative terminals of the battery
pack to present a scaled battery pack voltage to the BAT
pin. The bq2054 also uses the voltage across a sense re­sistor (R
tery pack and ground to monitor the current into the
pack. See Figure 4 for the configuration of this network.

The resistor values are calculated from the following:

Equation 1

) between the negative terminal of the bat-

SNS

NV

RB1
RB2

*

REG

=−

.205

1

V

These parameters are typically specified by the battery
manufacturer. The total resistance presented across the
battery pack by RB1 + RB2 should be between 150k
and 1MΩ. The minimum value ensures that the divider
network does not drain the battery excessively when the
power source is disconnected. Exceeding the maximum
value increases the noise susceptibility of the BAT pin.

The current sense resistor, R
mines the fast charge current. The value of R

(see Figure 5), deter

SNS

SNS

given by the following:

Equation 2

V

0 250.

I

=

MAX

R

SNS

where:

I

n

= Desired maximum charge current

MAX

Hold-Off Period

Both V
the first 1.33±0.19 seconds of both the Charge Qualifi­cation and Fast Charge phases. This condition prevents
premature termination due to voltage spikes that may
occur when charge is first applied.

HCO

and I

terminations are ignored during

MIN

Ω

-

is

where:

n

N = Number of cells in series

n

V

= Desired fast-charging voltage per cell

REG

6

bq2054

V

CC

10K

1K

1K

1K

6

LED2/DSEL

LED1

V

CC

V

SS

LCOM

LED3

16

15

13

12

11

10

bq2054

V

SS

FG205402.eps

Figure 3. Configured Display Mode/IMIN Threshold

V

CC

BAT +

RB1

3

BAT

13

V

CC

12

V

SS

SNS

bq2054

V

SS

7

FG205403.eps

RB2

R

SNS

BAT -

Figure 4. Configuring the Battery Divider

7

V

lt

bq2054

Battery Insertion and Removal

V

is interpreted by the bq2054 to detect the pres

CELL

ence or absence of a battery. The bq2054 determines
that a battery is present when V
High-Voltage Cutoff (V
the Low-Voltage Cutoff (V

HCO=VREG

= 0.8V). When V

LCO

is between the

CELL

+ 0.25V) and

CELL

outside this range, the bq2054 determines that no bat
tery is present and transitions to the Fault state. Tran
sitions into and out of the range between V

LCO

and V

HCO

are treated as battery insertions and removals, respec
tively. The V

limit also implicitly serves as an over-

HCO

voltage charge termination.

Inrush Current Control

Whenever the bq2054 is in the fault or charge-complete
state, the ICTL
used to disconnect the capacitor usually present in the
charger across the positive and negative battery termi
nals, preventing the cap from supplying large inrush
currents to a newly inserted battery. Such inrush cur
rents may trip the overcurrent protection circuitry usu
ally present in Li-Ion battery packs.

V

CC

output is driven low. This output can be

bq2054

RT1

Temperature Monitoring

-

The bq2054 monitors temperature by examining the
voltage presented between the TS and SNS pins by a re
sistor network that includes a Negative Temperature
Coefficient (NTC) thermistor. Resistance variations

is

around that value are interpreted as being proportional

-

to the battery temperature (see Figure 6).

­The temperature thresholds used by the bq2054 and
their corresponding TS pin voltage are:

-

TCO (Temperature Cutoff): Higher limit of the tem

n

perature range in which charging is allowed. V

0.4*V

CC

HTF (High-Temperature Fault): Threshold to which

n

temperature must drop after temperature cutoff is
exceeded before charging can begin again. V

0.44 * V

-

n

-

-

CC

LTF (Low-Temperature Fault): Lower limit of the
temperature range in which charging is allowed.
V

=0.6*V

LTF

CC

V

CC

Colder

TCO

HTF

-

-

=

=

13

V

CC

12

V

SS

SNS

TS

V

SS

RT2

7

8

R

Figure 5. Configuring

Temperature Sensing

SNS

NTC
Thermistor

RT

˚t

BAT -

V

= 0.6V

LTF

CC

age
o

V

= 0.44V

HTF

V

TCO

= 0.4V

CC
CC

SS

Figure 6. Voltage Equivalent

of Temperature

LTF

HTF
TCO

HotterV

Temperature

8

bq2054

A resistor-divider network can be implemented that
presents the defined voltage levels to the TS pin at the
desired temperatures (see Figure 6).

The equations for determining RT1 and RT2 are:

Equation 3

0 250

(.)

V

−

06

.*

V

=

CC

1

CC

*( )

RT1 RT2 R

+

(* )

RT2 R

+

LTF

LTF

Equation 4

044

.

=

+

1

1

+RT1 RT2 R

*( )

RT2 R

(* )

HTF

HTF

where:

R

n

n

= thermistor resistance at LTF

LTF

R

= thermistor resistance at HTF

HTF

TCO is determined by the values of RT1 and RT2. 1%
resistors are recommended.

Disabling Temperature Sensing

Temperature sensing can be disabled by placing 10k
resistors between TS and SNS and between SNS and
V

.

CC

Maximum Time-Out

MTO is programmed from 1 to 24 hours by an R-C net
work on the TM pin (see Figure 7) per the equation:

Equation 5

t

= 0.5*R*C

MTO

Where R is in kΩandCisinµF, t
maximum value for C (0.1µF) is typically used.

The MTO timer is reset at the beginning of fast charge
and when fast charge transitions from the current regu
lated to the voltage regulated mode. If MTO expires dur
ing the current regulated phase, the bq2054 enters the
Fault state and terminates charge. If the MTO timer ex
pires during the voltage regulated phase, fast charging
terminates and the bq2054 enters the Charge Complete
state.

The MTO timer is suspended (but not reset) during the
out-of-range temperature (Charge Pending) state.

is in hours. The

MTO

V

CC

R

1

TM

C

13

V

CC

12

V

SS

bq2054

V

SS

FG205406.eps

Figure 7. R-C Network for Setting MTO

Charge Regulation

Ω

The bq2054 controls charging through pulse-width
modulation of the MOD output pin, supporting both
constant-current and constant-voltage regulation.
Charge current is monitored at the SNS pin, and charge
voltage is monitored at the BAT pin. These voltages are
compared to an internal reference, and the MOD output
modulated to maintain the desired value.

-

Voltage at the SNS pin is determined by the value of re
sistor R

Equation 6

The switching frequency of the MOD output is deter
mined by an external capacitor (CPWM) between the
pin TPWM and ground, per the following:

-

­Equation 7

-

Where C is inµF and F is in kHz. A typical switching
rate is 100kHz, implying C
width is modulated between 0 and 90% of the switching
period.

To prevent oscillation in the voltage and current control
loops, frequency compensation networks (C or R-C) are typi
cally required on the V

, so nominal regulated current is set by:

SNS

I

= 0.250V/R

MAX

F

PWM

COMP

= 0.1/C

and I

SNS

PWM

= 0.001µF. MOD pulse

PWM

pins (respectively).

COMP

-

-

-

9

Absolute Maximum Ratings

Symbol Parameter Minimum Maximum Unit Notes

bq2054

V

CC

V

T

T

OPR

T

STG

T

SOLDER

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 Commercial

Storage temperature -55 +125 °C

Soldering temperature - +260 °C 10 sec. max.

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.

-

-

10

bq2054

DC Thresholds (T

= T

A

; VCC= 5V±10%)

OPR

Symbol Parameter Rating Unit Tolerance Notes

Internal reference voltage 2.05 V 1% TA= 25°C

V

REF

Temperature coefficient -0.5 mV/°C 10%

V

LTF

V

HTF

V

TCO

V

HCO

V

MIN

V

LCO

TS maximum threshold 0.6*V

TS hysteresis threshold 0.44*V

TS minimum threshold 0.4*V

CC

CC

CC

High cutoff voltage 2.3V V 1%

Under-voltage threshold at BAT 0.2*V

CC

Low cutoff voltage 0.8 V

0.250 V 10% I

V

SNS

Current sense at SNS

0.050 V 10% I

V

V

V

V

0.03V Low-temperature fault

±

0.03V High-temperature fault

±

0.03V Temperature cutoff

±

0.03V

±

0.03V

±

MAX

COND

11

bq2054

Recommended DC Operating Conditions (T

= T

A

OPR)

Symbol Parameter Minimum Typical Maximum Unit Notes

V

V

V

I

CC

I

IZ

V

V

V

V

I

OH

I

OL

I

IL

I

IH

CC

TEMP

CELL

IH

IL

OH

OL

Supply voltage 4.5 5.0 5.5 V

Temperature sense voltage 0 - V

Per cell battery voltage input 0 - V

CC

CC

VVTS- V

VV

BAT

- V

SNS

SNS

Supply current - 2 4 mA Outputs unloaded

DSEL tri-state open detection -2 - 2

tri-state open detection -2 2

I

TERM

Logic input high VCC-0.3 - - V DSEL, I

Logic input low - - VSS+0.3 V DSEL, I

LED

, ICTL, output high VCC-0.8 - - V I

1-3

MOD output high V

LED

, ICTL, output low - - VSS+0.8V V I

1-3

MOD output low - - V

LCOM output low - - V

LED

, ICTL, source -10 - - mA VOH=VCC-0.5V

1-3

-0.8 - - V I

CC

+0.8V V I

SS

0.5 V I

SS+

MOD source -5.0 - - mA V

LED

, ICTL, sink 10 - - mA VOL= VSS+0.5V

1-3

MOD sink 5 - - mA V

LCOM sink 30 - - mA V

DSEL logic input low source - - +30

logic input low source - - +70

I

TERM

DSEL logic input high source -30 - -

I

logic input high source -70 - -

TERM

A Note 2

µ

A

µ

TERM

TERM

10mA

≤

OH

10mA

≤

OH

10mA

≤

OL

10mA

≤

OL

30mA

≤

OL

OH=VCC

OL

OL

A V = VSSto VSS+ 0.3V, Note 2

µ

A V = VSSto VSS+ 0.3V

µ

A V = VCC- 0.3V to V

µ

A V = VCC- 0.3V to V

µ

-0.5V

= VSS+0.8V

= VSS+0.5V

Notes: 1. All voltages relative to VSSexcept where noted.

2. Conditions during initialization after V

applied.

CC

CC

CC

12

bq2054

Impedance

Symbol Parameter Minimum Typical Maximum Unit Notes

R

BATZ

R

SNSZ

R

TSZ

R

PROG1

R

PROG2

R

MTO

Timing (T

BAT pin input impedance 50 - - M

SNS pin input impedance 50 - - M

TS pin input impedance 50 - - M

Soft-programmed pull-up or pull-down
resistor value (for programming)

--10

Pull-up or pull-down resistor value - - 3 k

Charge timer resistor 20 - 480 k

= T

A

OPR;VCC

= 5V±10%)

Ω

Ω

Ω

DSEL

k

Ω

I

Ω

TERM

Ω

Symbol Parameter Minimum Typical Maximum Unit Notes

t

MTO

t

QT

t

HO

t

IMIN

F

PWM

Charge time-out range 1 - 24 hours See Figure 7

Pre-charge qual test time-out period - t

MTO

--

Termination hold-off period 1.14 - 1.52 sec.

Min. current detect filter period 80 160 msec.

= 0.001µF

C

PWM regulator frequency range - 100 kHz

PWM

(equation 7)

Capacitance

Symbol Parameter Minimum Typical Maximum Unit

C

C

MTO

PWM

Charge timer capacitor - - 0.1

PWM R-C capacitance - 0.001 -

13

F

µ

F

µ

bq2054

16-Pin DIP Narrow (PN)

16-Pin SOIC Narrow (SN)

D

e

E

H

C

A

A1

B

.004

16-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

C 0.008 0.013 0.20 0.33

D 0.740 0.770 18.80 19.56

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.

16-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 0.385 0.400 9.78 10.16

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

L

14

Data Sheet Revision History

Change No. Page No. Description Nature of Change

bq2054

1 5, 7, 8, 10 Value Change Changed V

2 5, 10 Value Change Changed V

SNS

REF

and I

MAX

3 10 Coefficient Addition Temperature coefficient added

4 5 New state diagram Diagram inserted

4 1, 2, 8, 12 NC pin replaced with ICTL

4 3,5,13

511

613

75I

Termination hold-off period added
I

detect filtering added

MIN

Rating changed to 2.3V

V

HCO

V

Tolerance changed to 1%

HCO

in Timing Specifications

t

QT

in Table 2 Z changes to Float

TERM

Changed values for V

t

QT

HCO

changed from (0.16 ∗ t

7 8 Figure 6 RB1 and RB2 changed to RT1 and RT2

810T

OPR

Deleted industrial temperature range.

Notes: Change 3 = April 1996 C changes from Dec. 1995 B.

Change 4 = Sept. 1996 D changes from April 1996 C.
Change 5 = Nov. 1996 E changes from Sept. 1996 D.
Change 6 = Oct. 1997 F changes from Nov. 1996 E.
Change 7 = Oct. 1997 G changes from Oct. 1997 F.
Change 8 = June 1999 H changes from Oct. 1997 G.

MTO

) to t

MTO

Ordering Information

bq2054

Package Option:

PN = 16-pin plastic DIP
SN = 16-pin narrow SOIC

Device:

bq2054 Li-Ion Fast-Charge IC

15

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