BQ24109_技术文档

bq24100, bq24103, bq24105

bq24108, bq24113, bq24115

SLUS606B − JUNE 2004 − REVISED NOVEMBER 2004

SYNCHRONOUS SWITCHMODE, LI-ION AND LI-POL CHARGE MANAGEMENT

IC WITH INTEGRATED POWERFETS (bqSWITCHERE)

FEATURES

DESCRIPTION

D

Ideal For High-Efficient Charger Designs For

Single-, Two- or Three-Cell Li-Ion and Li-Pol

Battery Packs

The bqSWITCHER™ series are highly integrated

Li-ion and Li-polymer switch-mode charge

management devices targeted at a wide range of

portable applications. The bqSWITCHER™ series

offers integrated synchronous PWM controller

and power FETs, high-accuracy current and

voltage regulation, charge preconditioning,

charge status, and charge termination, in a small,

thermally enhanced QFN package. The

system-controlled version provides additional

inputs for full charge management under system

control.

D

Integrated Synchronous Fixed-Frequency

PWM Controller Operating at 1.1 MHz with 0

to 100% Duty Cycle

D

Integrated PowerFETs For Up To 2-A Charge

Rate

High-Accuracy Voltage and Current

Regulation

Available In Both Stand-Alone (Built-In

Charge Management and Control) and

System-Controlled (Under System

Command) Versions

The bqSWITCHER charges the battery in three

phases: conditioning, constant current, and

constant voltage. Charge is terminated based on

D

Status Outputs For LED or Host Processor

Interface Indicates Charge-In-Progress,

Charge Completion, Fault, and AC-Adapter

Present Conditions

user-selectable minimum current level.

programmable charge timer provides a safety

backup for charge termination. The

A

bqSWITCHER automatically re-starts the charge

cycle if the battery voltage falls below an internal

threshold. The bqSWITCHER automatically

20-V Maximum Voltage Rating on IN and OUT

Pins

D

High-Side Current Sensing

enters sleep mode when V supply is removed.

CC

Optional Battery Temperature Monitoring

APPLICATIONS

Automatic Sleep Mode for Low Power

Consumption

D

Handheld Products

System-Controlled Version Can Be Used In

NiMH and NiCd Applications

Portable Media Players

Industrial and Medical Equipment

Portable Equipment

D

Uses Ceramic Capacitors

D

Reverse Leakage Protection Prevents

Battery Drainage

D

Thermal Shutdown and Protection

Built-In Battery Detection

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

bqSWITCHER™ and PowerPAD™ are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

1

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bq24100, bq24103, bq24105

bq24108, bq24113, bq24115

SLUS606B − JUNE 2004 − REVISED NOVEMBER 2004

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates. PowerPAD should act as the star ground between

PGND and VSS. See Layout section for more details.

TYPICAL SINGLE CELL Li-ION STAND-ALONE CHARGER

L

OUT

bq24100RHL

IN OUT

10 µH

R

(SNS)

V

IN

3

4

6

2

1

10 µF

C

OUT

IN

OUT 20

10 µF

VCC

PGND 17

STAT1 PGND 18

PACK+

19 STAT2

SNS 15

BAT 14

+

VTSB

PG

5

7

PACK−

R

(ISET1)

0.1 µF

TTC

ISET1

ISET2

8

9

C

(ISET2)

TTC

16 CE

R

T1

10 VSS

PWR PAD

TS 12

TEMP

VTSB 11

BATTERY

PACK

R

T2

V

IN

V

IN

V

IN

D1

Adapter

Present

D3

Charge

D2

Done

UDG−04033

ORDERING INFORMATION

(1)(2)

T

CHARGE REGULATION VOLTAGE (V)

INTENDED APPLICATION PART NUMBER

MARKINGS

CIA

J

4.2

Stand-alone

bq24100RHLR

1 or 2 cells selectable (CELLS pin 4.2 or 8.4 V)

Externally programmable (2.1 to 15.5 V)

4.2 (Blinking status pins)

bq24103RHLR

bq24105RHLR

bq24108RHLR

bq24113RHLR

bq24115RHLR

CID

−40°C to 125°C

Stand-alone

CIF

Stand-alone

CIU

1 or 2 cells selectable (CELLS pin 4.2 or 8.4 V)

Externally programmable (2.1 to 15.5 V)

System-controlled

CIJ

CIL

(1)

(2)

The RHL package is available taped and reeled only. Quantities are 3,000 devices per reel.

This product is RoHS compatible, including a lead concentration that does not exceed 0.1% of total product weight, and is suitable for use

in specified lead-free soldering processes.

2

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bq24100, bq24103, bq24105

bq24108, bq24113, bq24115

SLUS606B − JUNE 2004 − REVISED NOVEMBER 2004

PACKAGE DISSIPATION RATINGS

T

< 40°C

DERATING FACTOR

A

PACKAGE

θ

JA

POWER RATING

ABOVE T = 40°C

A

(1)

RHL

46.87 °C/W

1.81 W

0.021 W/°C

(1)

This data is based on using the JEDEC High-K board, and the exposed die pad is connected to a copper pad on the board. This is connected

to the ground plane by a 2x3 via matrix.

ABSOLUTE MAXIMUM RATINGS⁽¹⁾

UNIT

Supply voltage range, (with respect to V

)

IN, VCC

20

−0.3 to 20

−0.7 to 20

7

SS

STAT1, STAT2, PG, CE, CELLS, SNS, BAT

OUT

CMODE, TS, TTC

VTSB

Input voltage range, (with respect to V and PGND)

SS

V

3.6

ISET1, ISET2

3.3

Voltage difference between SNS and BAT inputs

1

(V

SNS

− V

)

BAT

Output sink

Output current (average)

Operating free−air temperature range, T

STAT1, STAT2, PG

OUT

10

mA

A

2.2

−40 to 85

−40 to 125

−65 to 150

300

A

Junction temperature range, T

J

°C

Storage temperature, T

stg

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds

(1)

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only,

and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating

conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

RECOMMENDED OPERATING CONDITIONS

MIN

NOM

MAX UNIT

†

‡

Supply voltage, V and IN (Tie together)

4.35

16.0

V

CC

Operating junction temperature range, T

−40

125

°C

J

†

‡

The IC continues to operate below V , to 3.5 V, but the specifications are not tested nor guaranteed.

The inherent switching noise voltage spikes should not exceed the absolute maximum rating on either the IN or OUT pins. A tight layout minimizes

min

switching noise.

3

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bq24100, bq24103, bq24105

bq24108, bq24113, bq24115

SLUS606B − JUNE 2004 − REVISED NOVEMBER 2004

ELECTRICAL CHARACTERISTICS

T = 0°C to 125°C and recommended supply voltage range (unless otherwise stated)

J

PARAMETER

INPUT CURRENTS

TEST CONDITIONS

MIN

TYP

MAX

UNIT

V

CC

V

CC

V

CC

> V

,

PWM switching

PWM NOT switching

CE = HIGH

10

CC(min)

mA

5

I

V

CC

supply current

VCC(VCC)

315

µA

0°C ≤ T ≤ 65°C,

V

= 4.2 V

J

I(BAT)

3.5

5.5

7.7

V

CC

< V

or V > V

but not in charge

(SLP)

CC

(SLP)

0°C ≤ T ≤ 65°C,

V

I(BAT)

= 8.4 V

Battery discharge sleep current,

(SNS, BAT, OUT, FB pins)

J

I

µA

(SLP)

V

CC

< V

or V > V

but not in charge

(SLP)

CC

(SLP)

0°C ≤ T ≤ 65°C,

V

I(BAT)

= 12.6 V

J

V

CC

< V

or V > V

but not in charge

(SLP)

CC

(SLP)

VOLTAGE REGULATION

CELLS = Low, in voltage regulation

CELLS = High, in voltage regulation

Operating in voltage regulation

4.2

8.4

4.2

Output voltage, bq24103/13

V

OREG

IBAT

Output voltage, bq24100/08

Feedback regulation REF for

bq24105/15 only (W/FB)

V

I

= 25 nA typical into pin

2.1

IBAT

T = 25°C

A

−0.5%

−1%

0.5%

1%

Voltage regulation accuracy

CURRENT REGULATION − FAST CHARGE

Output current range of converter

V

LOWV

V

(VCC)

≤ V

− V

< V

,

I(BAT)

OREG

I

150

2000

mA

OCHARGE

> V

(DO−MAX)

100 mV ≤ V

≤ 200 mV,

1000,

IREG

1V

V

+

IREG

RSET1

Programmed

Where

Voltage regulated across R

Accuracy

−

SNS

V

IREG

−10%

10%

5 kΩ ≤ RSET1 ≤ 10kΩ, Select RSET1 to

program V

,

IREG

V

= I

+ R

IREG(measured)

OCHARGE SNS

(−10% to +10% excludes errors due to RSET1

and R tolerances)

SNS

V

≤ V

(LOWV)

I(BAT) O(REG)

V

K

Output current set voltage

Output current set factor

1

V

(ISET1)

≥ V

×

,

(VCC)

I(BAT) V(DO−MAX)

V

LOWV

V

(VCC)

≤ V

< V

I(BAT) O(REG)

1000

V/A

(ISET1)

≥ V

+

,

I(BAT) V(DO−MAX)

PRECHARGE AND SHORT-CIRCUIT CURRENT REGULATION

Precharge to fast-charge transition

V

voltage threshold, BAT,

bq24100/03/05/08 ICs only

68

71.4

30

75 %V_O(REG)

LOWV

Deglitch time for precharge to fast

charge transition

Rising voltage; t

2-mV overdrive

, t

= 100 ns,

RISE FALL

t

20

15

40

ms

I

Precharge range

V

I(BAT)

V

I(BAT)

< V

,

t < t

200

mA

mV

V/A

OPRECHG

LOWV

PRECHG

V

K

Precharge set voltage, ISET2

Precharge current set factor

,

LOWV

100

(ISET2)

PRECHG

1000

4

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bq24100, bq24103, bq24105

bq24108, bq24113, bq24115

SLUS606B − JUNE 2004 − REVISED NOVEMBER 2004

ELECTRICAL CHARACTERISTICS (continued)

T = 0°C to 125°C and recommended supply voltage range (unless otherwise stated)

J

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

100 mV ≤ V

≤ 100 mV,

IREG-PRE

0.1V

RSET2

V

+

1000,

IREG*PRE

(PGM)

Where

Voltage regulated across R

Accuracy

−

SNS

V

−20%

20%

IREG-PRE

1.2 kΩ ≤ RSET2 ≤ 10kΩ, Select RSET1

to program V

IREG−PRE,

V

(Measured) = I

× R

IREG−PRE

OPRE−CHG SNS

(−20% to +20% excludes errors due to RSET1

and R tolerances)

SNS

CHARGE TERMINATION (CURRENT TAPER) DETECTION

Charge current termination detec-

tion range

I

V

> V

15

200

mA

TERM

I(BAT)

RCH

Charge termination detection set

voltage, ISET2

V

K

V

> V

100

mV

V/A

TERM

RCH

Termination current set factor

Charger termination accuracy

1000

(ISET2)

V

I(BAT)

> V

−20%

20%

40

RCH

Both rising and falling,

, t = 100 ns

2-mV overdrive

t

Deglitch time for charge termination

20

30

ms

dg-TERM

t

RISE FALL

TEMPERATURE COMPARATOR AND VTSB BIAS REGULATOR

V

Cold temperature threshold, TS

Hot temperature threshold, TS

Cutoff temperature threshold, TS

LTF hysteresis

72.8

33.7

28.7

0.5

73.5

34.4

29.3

1.0

74.2

35.1

29.9

1.5

LTF

HTF

TCO

%

V

O(VTSB)

Deglitch time for temperature fault,

TS

Both rising and falling,

, t = 100 ns

2-mV overdrive

t

20

30

40

ms

V

dg-TS

t

RISE FALL

V

CC

> V

,

IN(min)

V

TS bias output voltage

3.15

O(VTSB)

I

= 10 mA

0.1 µF ≤ C

≤ 1 µF,

(VTSB)

O(VTSB)

V

>

,

CC IN(min)

TS bias voltage regulation accuracy

−10%

10%

O(VTSB)

I

= 10 mA

(VTSB)

O(VTSB)

BATTERY RECHARGE THRESHOLD

V

Recharge threshold voltage

Below V

75

20

100

30

125 mV/cell

RCH

OREG

V

I(BAT)

< decreasing below threshold,

t

Deglitch time

40

ms

dg-RCH

t

= 100 ns

10-mV overdrive

FALL

STAT1, STAT2, AND PG OUTPUTS

Low-level output saturation voltage,

STATx

V

I

= 5 mA

0.5

0.1

OL(STATx)

OL(PG)

O

V

Low-level output saturation voltage,

PG

V

= 10 mA

O

CE CMODE, CELLS INPUTS

V

Low-level input voltage

High-level input voltage

I

= 5 µA

0.0

1.3

0.4

IL

V

= 20 µA

V

CC

IH

5

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bq24100, bq24103, bq24105

bq24108, bq24113, bq24115

SLUS606B − JUNE 2004 − REVISED NOVEMBER 2004

ELECTRICAL CHARACTERISTICS (continued)

T = 0°C to 125°C and recommended supply voltage range (unless otherwise stated)

J

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

TTC INPUT

t

Precharge timer

1440

25

1800

2160

s

PRECHG

CHARGE

Programmable charge timer range

Charge timer accuracy

Timer multiplier

t

= C

K

(TTC)

572 minutes

10%

×

(CHG)

(TTC)

0.01 µF ≤ C

≤ 0.18 µF

−10%

(TTC)

K

2.6

min/nF

TTC

C

Charge time capacitor range

TTC enable threshold voltage

0.01

0.22

µF

TTC

V

(TTC)

rising

200

mV

TTC_EN

SLEEP COMPARATOR

V

CC

≤

V

CC

≤

2.3 V ≤ V

≤ V

for 1 or 2 cells

V

IBAT

V

IBAT

I(OUT)

OREG,

+5 mV

+75mV

V

Sleep-mode entry threshold

V

SLP−ENT

V

CC

≤

V

CC

≤

(1)

V

= 12.6 V,

bq24105/15

R

= 1 kΩ

IN

I(OUT)

V

IBAT

V

IBAT

−4 mV

+73mV

160

V

t

Sleep-mode exit hysteresis,

Deglitch time for sleep mode

2.3 V ≤ V

≤ V

40

mV

SLP−EXIT

I(OUT)

OREG

V

CC

decreasing below threshold,

= 100 ns, 10-mV overdrive, PMOS turns off

5

µs

t

FALL

V

CC

decreasing below threshold,

dg-SLP

t

= 100 ns, 10-mV overdrive, STATx pins

20

30

40

ms

FALL

turn off

UVLO

V

IC active threshold voltage

IC active hysteresis

V

rising

falling

3.15

120

3.30

150

3.50

V

UVLO−ON

CC

mV

CC

PWM

7 V ≤ V ≤ V

400

500

130

150

CC

CC(max)

Internal P-channel MOSFET

on-resistance

4.5 V ≤ V ≤ 7 V

CC

mΩ

7 V ≤ V ≤ V

CC

CC(max)

Internal N-channel MOSFET

on-resistance

4.5 V ≤ V ≤ 7 V

CC

f

Oscillator frequency

1.1

MHz

OSC

Frequency accuracy

−9%

9%

D

Maximum duty cycle

100%

MAX

MIN

Minimum duty cycle

0%

t

Switching delay time (turn on)

Minimum synchronous FET on time

Synchronous FET minimum

20

60

ns

TOD

syncmin

50

400

mA

(2)

current-off threshold

6

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bq24100, bq24103, bq24105

bq24108, bq24113, bq24115

SLUS606B − JUNE 2004 − REVISED NOVEMBER 2004

ELECTRICAL CHARACTERISTICS (continued)

T = 0°C to 125°C and recommended supply voltage range (unless otherwise stated)

J

PARAMETER

BATTERY DETECTION

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Battery detection current during

time-out fault

I

V

I(BAT)

< V

− V

RCH

2

mA

DETECT

OREG

I

t

I

t

Discharge current

Discharge time

Wake current

Wake time

V

< V

− V

400

1

µA

s

DISCHRG1

WAKE

SHORT

I(BAT)

OREG

RCH

< V

2

mA

s

0.5

WAKE

Begins after termination detected,

≤ V

I

Termination discharge current

400

262

µA

DISCHRG2

V

I(BAT)

OREG

t

Termination time

ms

DISCHRG2

OUTPUT CAPACITOR

Required output ceramic capacitor

range from SNS to PGND, between

inductor and R

C

4.7

10

47

µF

OUT

SNS

Required SNS capacitor (ceramic)

at SNS pin

0.1

SNS

PROTECTION

Threshold over V

to turn-off P-channel

OREG

V

OVP

OVP threshold voltage

MOSFET, STAT1, and STAT2 during charge or

termination states

110

117

121 %V_O(REG)

I

Cycle-by-cycle current limit

Short-circuit voltage threshold, BAT

Short-circuit current

2.6

1.95

35

3.6

4.5

2.05

65

A

LIMIT

V

falling

2.00

V/cell

mA

SHORT

I(BAT)

I

≤ V

SHORT

I(BAT)

T

Thermal trip

165

10

SHTDWN

°C

Thermal hysteresis

(1)

(2)

For bq24105 and bq24115 only. R is connected between IN and PGND pins and needed to ensure sleep entry.

N-channel always turns on for ~60 ns and then turns off if current is too low.

IN

RHL PACKAGE

(BOTTOM VIEW)

1

20

STAS2

PGND

CE

SNS

BAT

19

18

17

16

15

14

13

12

2

3

4

5

6

7

8

9

STAT1

IN

PG

VCC

TTC

ISET1

ISET2

NC

TS

11

10

7

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bq24100, bq24103, bq24105

bq24108, bq24113, bq24115

SLUS606B − JUNE 2004 − REVISED NOVEMBER 2004

TERMINAL FUNCTIONS

TERMINAL

I/O

Description

bq24100

bq24108

NAME

BAT

bq24103

14

bq24105 bq24113 bq24115

Battery voltage sense input. Bypass it with a capacitor to PGND if there are long

inductive leads to battery.

14

16

14

16

14

16

I

Charger enable input. This active low input, if set high, suspends charge and

places the device in the low-power sleep mode. Do not pull up this input to VTSB.

16

CE

Available on parts with fixed output voltage. Ground or float for single cell

operation (4.2 V). For two cells operation (8.4 V) pull up this pin with a resistor to

CELLS

CMODE

FB

13

7

I

V

CC

.

Charge mode selection: low for precharge as set by ISET2 pin and high (pull up to

VTSB or <7 V) for fast charge as set by ISET1.

7

Output voltage analog feedback adjustment. Connect the output of a resistive

voltage divider powered from the battery terminals to this node to adjust the output

battery voltage regulation.

13

IN

3, 4

8

3, 4

8

3, 4

8

3, 4

8

3, 4

8

I

Charger input voltage.

Charger current set point 1 (fast charge). Use a resistor to ground to set this

value.

ISET1

I/O

Charge current set point 2 (precharge and termination), set by a resistor

connected to ground. A low-level CMODE signal selects the ISET2 charge rate,

but if the battery voltage reaches the regulation set point, bqSWITCHER changes

to voltage regulation regardless of CMODE input.

ISET2

9

I/O

N/C

13

1

19

1

19

1

No connection. This pin must be left floating in the application.

−

O

1

OUT

Charge current output inductor connection.

20

Power good status output (open drain). The transistor turns on when a valid V

is detected. It is turned off in the sleep mode. PG can be used to drive a LED or

communicate with a host processor.

CC

5

PG

O

PGND

SNS

17,18

15

17,18

15

17,18

15

17,18

15

17, 18

15

Power ground input

Charge current-sense input. Battery current is sensed via the voltage drop

developed on this pin by an external sense resistor in series with the battery pack.

A 0.1-µF capacitor to PGND is required.

I

Charge status 1 (open-drain output). When the transistor turns on indicates

charge in process. When it is off and with the condition of STAT2 indicates various

charger conditions (See Table 1)

STAT1

STAT2

TS

2

19

12

7

2

19

12

7

2

19

12

7

2

O

I

Charge status 2 (open-drain output). When the transistor turns on indicates

charge is done. When it is off and with the condition of STAT1 indicates various

charger conditions (See Table 1)

Temperature sense input. This input monitors its voltage against an internal

threshold to determine if charging is allowed. Use an NTC thermistor and a

voltage divider powered from VTSB to develop this voltage. (See Figure 7)

12

Timer and termination control. Connect a capacitor from this node to GND to set

the bqSWITCHER timer. When this input is low the timer and termination

detection are disabled.

TTC

I

VCC

VSS

6

Analog device input

Analog ground input

10

TS internal bias regulator voltage. Connect capacitor (with a value between a

0.1-µF and 1-µF) between this output and VSS.

VTSB

11

O

There is an internal electrical connection between the exposed thermal pad and

VSS. The exposed thermal pad must be connected to the same potential as the

VSS pin on the printed circuit board. The power pad can be used as a star ground

Exposed

Thermal

Pad

−

connection between V and PGND. A common ground plane may be used. VSS

SS

pin must be connected to ground at all times.

8

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bq24100, bq24103, bq24105

bq24108, bq24113, bq24115

SLUS606B − JUNE 2004 − REVISED NOVEMBER 2004

FUNCTIONAL BLOCK DIAGRAM

−

+

9

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bq24100, bq24103, bq24105

bq24108, bq24113, bq24115

SLUS606B − JUNE 2004 − REVISED NOVEMBER 2004

TYPICAL CHARACTERISTICS

EFFICIENCY

vs

OUTPUT CHARGE CURRENT

EFFICIENCY

vs

OUTPUT CHARGE CURRENT

100

90

100

90

80

V

IN

= 9 V

70

60

50

70

60

50

V

IN

= 4.5 V

V

IN

= 16 V

V

IN

= 16 V

40

30

40

30

20

10

0

20

10

V

= 4.2 V

(BAT)

V

= 8.4 V

(BAT)

1 Cell

= 25°C

2 Cell

T = 25°C

A

T

A

0

0.5

1

1.5

2

0

0.5

1

1.5

2

I

= Output Charge Current − A

I

= Output Charge Current − A

O(CHARGE)

Figure 1

Figure 2

L

OUT

10 µH

bq24113RHL

R

(SNS)

V

IN

3

4

6

2

5

7

IN

OUT 1

10 µF

C

OUT

10 µF

IN

OUT 20

VCC

PGND 17

STAT1 PGND 18

PG SNS 15

CMODE BAT 14

PACK+

+

PACK−

0.1 µF

R

(ISET1)

16 CE

ISET1

ISET2

8

9

(ISET2)

R

T1

10 VSS

TS 12

TEMP

13 CELLS

VTSB 11

R

T2

BATTERY

PACK

To System

UDG−04035

Figure 3. Typical Application Circuit (System-Controlled Version)

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APPLICATION INFORMATION

POR

Check for Battery

Presence

Battery

Detect?

No

Indicate BATTERY

ABSENT

Yes

Suspend Charge

TS Pin

in LTF to HTF

Range?

No

Indicate CHARGE

SUSPEND

Yes

V_BAT<V_LOWV

No

Regulate

I_PRECHG

Reset and Start

T30min timer

Yes

Indicate Charge−

In−Progress

Suspend Charge

TS pin

in LTF to TCO

range?

Reset and Start

FSTCHG timer

No

Indicate CHARGE

SUSPEND

No

Regulate

Current or Voltage

Yes

V_BAT<V_LOWV

Yes

TS pin

in LTF to HTF

range?

Indicate Charge−

In−Progress

No

Suspend Charge

Yes

TS Pin

in LTF to TCO

Range?

No

Indicate CHARGE

SUSPEND

T30min

Expired?

No

Yes

No

TS pin

in LTF to HTF

range?

FSTCHG Timer

Expired?

No

V_BAT<V_LOWV

No

Yes

− Fault Condition

− Enable I

DETECT

No

I_TERMdetection?

Indicate Fault

No

Yes

Battery

Replaced?

(Vbat < Vrch?)

− Turn Off Charge

− Enable I

for

DISCHG

t_DISCHG2

Indicate Charge−

In−Progress

Yes

*NOTE: If the TTC pin is

pulled low, the safety timer

and termination are

Charge Complete

V_BAT< V_RCH

?

No

disabled; the charger

continues to regulate, and

the STAT pins indicate

charge in progress.

Indicate DONE

*

Battery Removed

If the TTC pin is pulled high

(VTSB), only the safety

timer is disabled

Yes

Indicate BATTERY

ABSENT

(termination is normal).

Figure 4. Stand-Alone Version Operational Flow Chart

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POR

SLEEP MODE

Vcc > V

Checked at All

Times

I(BAT)

No

Indicate SLEEP

MODE

Yes

/CE=Low

Yes

Regulate

I

O(PRECHG)

CMODE=Low

Yes

Indicate Charge−

In−Progress

No

Yes

/CE=High

No

Regulate Current

or Voltage

Yes

Indicate Charge−

In−Progress

CMODE=High

or

Yes

V

in V

REG

IBAT

Yes

No

CMODE=Low

No

/CE=High

Yes

Turn Off Charge

Indicate DONE

Yes

No

/CE=Low

Yes

Figure 5. System-Controlled Operational Flow Chart

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FUNCTIONAL DESCRIPTION FOR STANDALONE VERSION (bq2410x)

The bqSWITCHER™ supports a precision Li-ion or Li-polymer charging system for single-, two- or three-cell

applications. See Figure 4 and Figure 5 for operational flow charts and Figure 6 for a typical charge profile.

Precharge

Phase

Voltage Regulation and

Charge Termination Phase

Current Regulation Phase

Regulation Voltage

Regulation Current

Charge Voltage

V

LOW

V

SHORT

Charge Current

Precharge

and Termination

I

SHORT

Programmable

Safety Timer

Precharge

Timer

UDG−04037

Figure 6. Typical Charging Profile

Temperature Qualification

The bqSWITCHER continuously monitors battery temperature by measuring the voltage between the TS pin

and VSS pin. A negative temperature coefficient thermistor (NTC) and an external voltage divider typically

develop this voltage. The bqSWITCHER compares this voltage against its internal thresholds to determine if

charging is allowed. To initiate a charge cycle, the battery temperature must be within the V

-to-V

(LTF)

(HTF)

thresholds. If battery temperature is outside of this range, the bqSWITCHER suspends charge and waits until

the battery temperature is within the V -to-V range. During the charge cycle (both precharge and fast

(LTF)

(HTF)

charge), the battery temperature must be within the V

-to-V

thresholds. If battery temperature is outside

(LTF)

(TCO)

of this range, the bqSWITCHER suspends charge and waits until the battery temperature is within the

-to-V range. The bqSWITCHER suspends charge by turning off the PWM and holding the timer value

V

(LTF)

(HTF)

(i.e., timers are not reset during a suspend condition). Note that the bias for the external resistor divider is

provided from the VTSB output. Applying a constant voltage between the V

pin disables the temperature-sensing feature.

-to-V

thresholds to the TS

(LTF)

(HTF)

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V

CC

Charge Suspend

V

(LTF)

Temperature Range

to Initiate Charge

Temperature Range

During Charge Cycle

V

(HTF)

(TCO)

Charge Suspend

V

SS

Figure 7. TS Pin Thresholds

Battery Preconditioning (Precharge)

On power up, if the battery voltage is below the V

threshold, the bqSWITCHER applies a precharge

LOWV

current, I

safety timer, t

, to the battery. This feature revives deeply discharged cells. The bqSWITCHER activates a

PRECHG

, during the conditioning phase. If the V

threshold is not reached within the timer

PRECHG

LOWV

period, the bqSWITCHER turns off the charger and enunciates FAULT on the STATx pins. In the case of a

FAULT condition, the bqSWITCHER reduces the current to I . I is used to detect a battery

DETECT DETECT

replacement condition. Fault condition is cleared by POR or battery replacement.

The magnitude of the precharge current, I , is determined by the value of programming resistor,

O(PRECHG)

R

(ISET2)

, connected to the ISET2 pin.

K

V

(ISET2)

⁺ǒ_R

_(SNS)Ǔ

I

O(PRECHG)

R

(ISET2)

(1)

where

D

R

V

is the external current-sense resistor

is the output voltage of the ISET2 pin

SNS

(ISET2)

K

V

is the V/A gain factor

and K are specified in the Electrical Characteristics table.

(ISET2)

Battery Charge Current

The battery charge current, I

, is established by setting the external sense resistor, R

, and the

(SNS)

O(CHARGE)

resistor, R , connected to the ISET1 pin.

(ISET1)

In order to set the current, first choose R

based on the regulation threshold V

across this resistor. Let

(SNS)

IREG

V

IREG

= 100 mV to start and calculate the R

value needed.

SNS

V

IREG

OCHARGE

R

+

(SNS)

I

(2)

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If this value is not a standard sense resistor value, choose the next larger value. Using the selected standard

value, solve for V

.

IREG

V

+ R

I

(SNS) OCHARGE

IREG

(3)

(4)

The value of R

is then calculated based on the following equation:

(ISET1)

K

V

R

ISET1

1000 V

R

+

SET1

I

V

OCHARGE

SNS

IREG

where

D

V

I

is the voltage regulated across R

is the battery charge current

IREG

SNS

OCHARGE

R

V

is the external current sense resistor

is the output voltage of the ISET1 pin

SNS

(ISET1)

K(ISET1) is the V/A gain factor (see electrical characteristics table)

The following provide a more detailed design procedure and example for this parameter:

1. Select the charge current.

Example:

• I

= 2 A

OCHARGE

OPRECHG

• I

= 200 mA

2. Select the sense resistor value. Ensure that the power rating of the sense resistor is not exceeded

Example:

• Let V

= 100 mV (S/B from 100−200 mV)

IREG

V

IREG

100 mV

2 A

•

Solve for R

+

+ 50 mW

SNS

I

OCHARGE

• ^{Check availability for R}

. Use value that is equal (next larger value if not available).

SNS

• Check for power dissipation

ǒ_I_OCHARGEǓ²

2

(

)

P

+ R

+ 0.05 W 2 A + 0.2 W

(SNS)

(5)

• Select 0805 or 1206 size rated at 0.25 W

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3. Determine R

.

(ISET1)

• V

= 1 V

(ISET1)

• K

= 1000 V/A

(ISET1)

K

R

V

(ISET1)

1000 VńA 1 V

0.05 W 2 A

(ISET1)

R

+

+ 10 kW

(ISET1)

I

(SNS)

OCHARGE

(6)

(7)

4. Determine R

(ISET2)

• V

• K

= 0.1 V

(ISET2)

= 1000V/A

K

R

V

(ISET2)

1000 VńA 0.1 V

0.05 W 0.2 A

(ISET2)

R

+

+ 10 kW

(ISET2)

I

(SNS)

OPRECHG

R

SENSE

SNS

BAT

V

= 1 V

(ISET1)

ISET1

I

(ISET1)

R

(ISET1)

V

= 0.1 V

(ISET2)

ISET2

R

I

(ISET2)

VSS

UDG−04036

Figure 8. Program Charge Current with R

and R

(ISET2)

(ISET1)

Battery Voltage Regulation

The voltage regulation feedback occurs through the BAT pin. This input is tied directly to the positive side of the

battery pack. The bqSWITCHER monitors the battery-pack voltage between the BAT and VSS pins. The

bqSWITCHER is offered in two fixed-voltage versions: 4.2 V and 8.4 V as selected by the CELLS input. A low

or floating input on the CELLS selects single-cell mode (4.2 V) while a high-input selects two-cell mode.

For device options that include adjustable output voltage, the voltage regulation feedback is through the FB pin.

A resistor divider is used from the battery output voltage to GND. BAT pin remains connected directly to the

battery output voltage for current sensing with respect to SNS.

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Charge Termination And Recharge

The bqSWITCHER monitors the charging current during the voltage regulation phase. Once the termination

threshold, I , is detected, the bqSWITCHER terminates charge. The termination current level is selected

TERM

by the value of programming resistor, R

, connected to the ISET2 pin.

(ISET2)

K

⁺ǒ_R

V

(ISET2)

TERM

I

TERM

_(SNS)Ǔ

R

(ISET2)

(8)

where

D

R

V

is the external current-sense resistor

is the output of the ISET2 pin

is the A/V gain factor

(SNS)

TERM

K

V

(ISET2)

and K

are specified in the Electrical Characteristics table

TERM

(ISET2)

As a safety backup, the bqSWITCHER also provides a programmable charge timer. The charge time is

programmed by the value of a capacitor connected between the TTC pin and GND by the following formula:

t

+ C

K

(TTC) (TTC)

CHARGE

(9)

where

D

C

K

is the capacitor connected to the TTC pin

is the multiplier

(TTC)

D

(TTC)

A new charge cycle is initiated when one of the following conditions are detected:

D

The battery voltage falls below the V

threshold

RCH

Power-on reset (POR), if battery voltage is below the V

CE toggle

threshold

RCH

TTC pin, described as follows.

In order to disable the charge termination and safety timer, the user can pull the TTC input below the V

TTC_EN

threshold. Going above this threshold enables the termination and safety timer features and also reset the timer.

Tying TTC high to VTSB disables the safety timer only.

Sleep Mode

The bqSWITCHER enters the low-power sleep mode if the VCC pin is removed from the circuit. This feature

prevents draining the battery during the absence of VCC.

Charge Status Outputs

The open-drain STAT1 and STAT2 outputs indicate various charger operations as shown in the following table.

These status pins can be used to drive LEDs or communicate to the host processor. Note that OFF indicates

that the open-drain transistor is turned off.

Table 1. Status Pins Summary

Charge State

STAT1

ON

STAT2

OFF

ON

Charge-in-progress

Charge complete

OFF

(1)

Charge suspend, timer fault, overvoltage, sleep mode, battery absent

OFF

(1)

bq2411x IC do not have timer fault or battery absent modes

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Table 2. Status Pins Summary (bq24108 only)

Charge State

STAT1

OFF

STAT2

OFF

ON

Battery absent

Charge-in-progress

Charge complete

ON

OFF

Battery over discharge, V

< V

ON/OFF (0.5 Hz)

OFF

I(BAT)

(SC)

Charge suspend, (due to TS pin and internal thermal protection)

Precharge timer fault

Fast charge timer fault

Sleep mode

PG Output

The open-drain PG (power good) indicates when the AC-to-DC adapter (i.e., V ) is present. The output turns

CC

ON when sleep-mode exit threshold, V

, is detected. This output is turned off in the sleep mode. The

SLP−EXIT

PG pin can be used to drive an LED or communicate to the host processor.

CE Input (Charge Enable)

The CE digital input is used to disable or enable the charge process. A low-level signal on this pin enables the

charge and a high-level V signal disables the charge. A high-to-low transition on this pin also resets all timers

CC

and fault conditions. Note that the CE pin cannot be pulled up to VTSB voltage. This may create power-up

issues.

Battery Absent Detection

For applications with removable battery packs, bqSWITCHER provides a battery absent detection scheme to

reliably detect insertion and/or removal of battery packs.

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POR or V

Yes

RCH

Detection routine runs on power up

and if V drops below refresh

threshold due to removing battery

or discharging battery.

BAT

Enable

(DETECT)

I

for t

(DETECT)

BATTERY

PRESENT,

Begin Charge

No

V

I(BAT)

<V

(LOWV)

Yes

Apply I

(WAKE)

for t

BATTERY

PRESENT,

Begin Charge

V

>

I(BAT)

No

V

O(REG)

−V

RCH

Yes

BATTERY

ABSENT

Figure 9. Battery Absent Detection for bq2410x ICs only

The voltage at the BAT pin is held above the battery recharge threshold, V , by the charged battery following

RCH

fast charging. When the voltage at the BAT pin falls to the recharge threshold, either by a load on the battery

or due to battery removal, the bqSWITCHER begins a battery absent detection test. This test involves enabling

a detection current, I

precharge threshold, V

, for a period of t

. Following this, the precharge current, I

and checking to see if the battery voltage is below the

DETECT

is applied for a period of t

OPRECHG DETECT

LOWV

and the battery voltage is checked again to ensure that it is above the recharge threshold. The purpose of this

current is to attempt to close a battery pack with an open protector, if one is connected to the bqSWITCHER.

Passing both of the discharge and charging tests indicates a battery absent fault at the STAT pins. Failure of

either test starts a new charge cycle. For the absent battery condition, the voltage on the BAT pin rises and falls

between the V

and V

thresholds indefinitely.

LOWV

OREG

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Timer Fault Recovery

As shown in Figure 5, bqSWITCHER provides a recovery method to deal with timer fault conditions. The

following summarizes this method.

Condition #1

V

I(BAT)

above recharge threshold (V

− V

) and timeout fault occurs.

OREG

RCH

Recovery method: bqSWITCHER waits for the battery voltage to fall below the recharge threshold. This could

happen as a result of a load on the battery, self-discharge or battery removal. Once the battery falls below the

recharge threshold, the bqSWITCHER clears the fault and enters the battery absent detection routine. A POR

or CE or TTE toggle also clears the fault.

Condition #2

Charge voltage below recharge threshold (V

) and timeout fault occurs

RCH

Recovery method: Under this scenario, the bqSWITCHER applies the I

current. This small current is

DETECT

used to detect a battery removal condition and remains on as long as the battery voltage stays below the

recharge threshold. If the battery voltage goes above the recharge threshold, then the bqSWITCHER disables

the I

current and executes the recovery method described for condition #1. Once the battery falls below

DETECT

the recharge threshold, the bqSWITCHER clears the fault and enters the battery absent detection routine. A

POR or CE toggle also clears the fault.

Output Overvoltage Protection (Applies To All Versions)

The bqSWITCHER provides a built-in overvoltage protection to protect the detect and other components

against damages if the battery voltage gets too high, as when the battery is suddenly removed. When an

overvoltage condition is detected, this feature turns off the PWM and STATx pins. The fault is cleared once V

IBAT

drops to the recharge threshold (V

− V

).

OREG

RCH

FUNCTIONAL DESCRIPTION FOR SYSTEM-CONTROLLED VERSION (bq2411x)

For applications requiring charge management under the host system control, the bqSWITCHER (bq2411x)

offers a number of control functions. The following section describes these functions.

Precharge And Fast Charge Control

A low-level signal on the CMODE pin forces the bqSWITCHER to charge at the precharge rate set on the ISET2

pin. A high-level signal forces charge at fast charge rate as set by the ISET1 pin. If the battery reaches the

voltage regulation level, V

, the bqSWITCHER transitions to voltage regulation phase regardless of the

OREG

status of the CMODE input.

Charge Termination And Safety Timers

The charge timers and termination are disabled in the system-controlled versions of the bqSWITCHER. The

host system can use the CE input to enable or disable charge. When an overvoltage condition is detected, the

charger process stops, and all power FETs are turned off.

Inductor, Capacitor, and Sense Resistor Selection Guidelines

The bqSWITCHER provides internal loop compensation. With this scheme, best stability occurs when LC

resonant frequency, f is approximately 16 kHz (8 kHz to 32 kHz). Equation (10) can be used to calculate the

o

value of the output inductor and capacitor. Table 2 provides a summary of typical component values for various

charge rates.

1

f +

0

_2pǸ_L

C

OUT

(10)

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Table 3. Output Components Summary

CHARGE CURRENT

Output inductor, L

0.5 A

22 µH

4.7 µF

0.2 Ω

1 A

2 A

4.7 µH

10 µH

10 µF

0.1 Ω

OUT

Output capacitor, C

22 µF (or 2 × 10 µH) ceramic

0.05 Ω

OUT

(SNS)

Sense resistor, R

THERMAL CONSIDERATIONS

The SWITCHER is packaged in a thermally enhanced MLP package. The package includes a thermal pad to

provide an effective thermal contact between the IC and the printed circuit board (PCB). Full PCB design

guidelines for this package are provided in the application note entitled: QFN/SON PCB Attachment Application

Note (SLUA271).

The most common measure of package thermal performance is thermal impedance (θ ) measured (or

JA

modeled) from the chip junction to the air surrounding the package surface (ambient). The mathematical

expression for θ is:

JA

T_J* T_A

q_(JA)

+

P

(11)

Where:

T = chip junction temperature

J

T = ambient temperature

A

P = device power dissipation

Factors that can greatly influence the measurement and calculation of θ include:

JA

D

Whether or not the device is board mounted

Trace size, composition, thickness, and geometry

Orientation of the device (horizontal or vertical)

Volume of the ambient air surrounding the device under test and airflow

Whether other surfaces are in close proximity to the device being tested

The device power dissipation, P, is a function of the charge rate and the voltage drop across the internal power

FET. It can be calculated from the following equation:

P = [Vin × lin − Vbat × Ibat]

Due to the charge profile of Li-xx batteries, the maximum power dissipation is typically seen at the beginning

of the charge cycle when the battery voltage is at its lowest. (See Figure 6.)

PCB LAYOUT CONSIDERATION

It is important to pay special attention to the PCB layout. The following provides some guidelines:

D

To obtain optimal performance, the power input capacitors, connected from input to PGND should be placed

as close as possible to the bqSWITCHER. The output inductor should be placed directly above the IC and

the output capacitor connected between the inductor and PGND of the IC. The intent is to minimize the

current path loop area from the OUT pin through the LC filter and back to the GND pin. The sense resistor

should be adjacent to the junction of the inductor and output capacitor. Route the sense leads connected

across the Rsns back to the IC, close to each other (minimize loop area) or on top of each other on adjacent

layers (do not route the sense leads through a high-current path). Use an optional capacitor downstream

from the sense resistor if long (inductive) battery leads are used.

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D

Place all small signal components (C

components such that routing interrupts power stage currents). All small control signals should be routed

away from the high current paths.

, RSET1/2 and TS) close to their respective IC pin (do not place

TTC

The PWB should have a ground plane (return) connected directly to the return of all components through

vias (3 vias per capacitor for power-stage capacitors, 3 vias for the IC PGND, 1 via per capacitor for small

signal components). A star ground design approach is typically used to keep circuit block currents isolated

(high-power/low-small signal) which reduces noise coupling and ground bounce issues. A single ground

plane for this design gives good results. With this small layout and a single ground plane, there is not a

ground bounce issue, and having the components segregated minimizes coupling between signals.

D

The high-current charge paths into IN and from the OUT pins must be sized appropriately for the maximum

charge current in order to avoid voltage drops in these traces. The PGND pins should be connected to the

ground plane to return current through the internal low-side FET. The thermal vias in the IC PowerPAD™

provide the return path connection.

The bqSWITCHER is packaged in a thermally enhanced MLP package. The package includes a thermal

pad to provide an effective thermal contact between the IC and the printed circuit board (PCB). Full PCB

design guidelines for this package are provided in the application note entitled: QFN/SON PCB Attachment

Application Note (SLUA271). Six 10−13 mil vias are a minimum number of recommended vias, placed in

the IC’s power pad, connecting it to a ground thermal plane on the opposite side of the PWB. This plane

must be at the same potential as Vss and PGND of this IC.

D

See the User Guide (SLUU200) for an example of good layout.

WAVEFORMS: All waveforms are taken at Lout (IC Out pin). V = 7.6 V and the battery was set to 2.6 V, 3.5

IN

V, and 4.2 V for the three waveforms. When the top switch of the converter is on, the waveform is at ~7.5 V, and

when off, the waveform is near ground. Note that the ringing on the switching edges is small. This is due to a

tight layout (minimized loop areas), a shielded inductor (closed core), and using a low-inductive scope ground

lead (i.e., short with minimum loop) .

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Precharge: The current is low in precharge so the bottom synchronous FET turns off after its minimum on-time

which explains the step between ~0 V and −0.5 V. When the bottom FET and top FET are off, the current

conducts through the body diode of the bottom FET which results in a diode drop below the ground potential.

The initial negative spike is the delay turning on the bottom FET, which is to prevent shoot-through current as

the top FET is turning off.

Fast Charge: This is captured during the constant-current phase. The two negative spikes are the result of the

short delay when switching between the top and bottom FETs. The break-before-make action prevents current

shoot-through and results in a body diode drop below ground potential during the break time.

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Charge during Voltage Regulation and Approaching Termination: Note that this waveform is similar to the

precharge waveform. The difference is that the battery voltage is higher so the duty cycle is slightly higher. The

bottom FET stays on longer because there is more of a current load than during precharge; it takes longer for

the inducator current to ramp down to the current threshold where the synchronous FET is disabled.

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bq24100, bq24103, bq24105

bq24108, bq24113, bq24115

SLUS606B − JUNE 2004 − REVISED NOVEMBER 2004

Application Note: Charging Battery and Powering System Without Affecting Battery Charge and

Termination.

L

OUT

bq24100RHL

IN OUT

10 µH

R

(SNS)

V

IN

3

4

6

2

1

R

10 µF

(SYS)

C

OUT

IN

OUT 20

10 µF

VCC

PGND 17

STAT1 PGND 18

PACK+

19 STAT2

SNS 15

BAT 14

+

PG

5

7

PACK−

VTSB

R

(ISET1)

0.1 µF

TTC

ISET1

ISET2

8

9

C

(ISET2)

TTC

16 CE

R

T1

10 VSS

PWR PAD

TS 12

TEMP

VTSB 11

BATTERY

PACK

R

T2

V

IN

V

IN

V

IN

D1

Adapter

Present

D3

Charge

D2

Done

UDG−04033

The bqSWITCHER was designed as a stand-alone battery charger but can be easily adapted to power a system

load, while considering a few minor issues.

Advantages:

1. The charger controller is based only on what current goes through the current-sense resistor (so precharge,

constant current, and termination all work well), and is not affected by the system load.

2. The input voltage has been converted to a usable system voltage with good efficiency from the input.

3. Extra external FETs are not needed to switch power source to the battery.

4. The TTC pin can be grounded to disable termination and keep the converter running and the battery fully

charged, or let the switcher terminate when the battery is full and then run off of the battery via the sense

resistor.

Other Issues:

1. If the system load current is large (≥ 1 A) the IR drop across the battery impedance causes the battery

voltage to drop below the refresh threshold and start a new charge. The charger would then terminate due

to low charge current. Therefore, the charger would cycle between charging and termination. If the load is

smaller, the battery would have to discharge down to the refresh threshold resulting in a much slower

cycling. Note that grounding the TTC pin keeps the converter on continuously.

2. If TTC is grounded, the battery is kept at 4.2 V (not much different than leaving a fully charged battery set

unloaded).

3. The efficiency takes a 2−3% hit when discharging through the sense resistor to the system.

25

www.ti.com

PACKAGE OPTION ADDENDUM

www.ti.com

30-Mar-2005

PACKAGING INFORMATION

Orderable Device

Status ⁽¹⁾

Package Package

Pins Package Eco Plan ⁽²⁾Lead/Ball Finish MSL Peak Temp ⁽³⁾

Qty

Type

QFN

Drawing

BQ24100RHL

PREVIEW

ACTIVE

RHL

20

50

TBD

Call TI

BQ24100RHLR

RHL

3000

Pb-Free

(RoHS)

CU NIPDAU Level-1-260C-UNLIM

BQ24103RHLR

BQ24105RHLR

BQ24108RHLR

BQ24113RHLR

BQ24115RHLR

ACTIVE

QFN

RHL

20

3000

Pb-Free

(RoHS)

Pb-Free

(RoHS)

Pb-Free

(RoHS)

Pb-Free

(RoHS)

Pb-Free

(RoHS)

⁽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

-

The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS

&

no Sb/Br)

-

please check

http://www.ti.com/productcontent for the latest availability information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements

for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered

at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame

retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)

(3)

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

temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is

provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the

accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take

reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on

incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited

information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI

to Customer on an annual basis.

Addendum-Page 1

IMPORTANT NOTICE

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enhancements, improvements, and other changes to its products and services at any time and to discontinue

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型号：	BQ24109
厂家：	TEXAS INSTRUMENTS
描述：	SYNCHRONOUS SWITCHMODE, LI-ION AND LI-POLYMER CHARGE-MANAGEMENT IC WITH INTEGRATED POWER FETs (bqSWITCHER⑩) 同步开关模式，锂离子和锂聚合物充电管理，集成功率FET的IC （ bqSWITCHER ™ ）开关
文件：	总29页 (文件大小：611K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

BQ24109 [TI]

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