BQ24113RHLRE3_技术文档

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SLUS606 − JUNE 2004

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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−Pol switch−mode charge

management devices targeted at a wide range of

portable applications. The bqSWITCHER series

offer integrated synchronous PWM controller and

PowerFETs, 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 Standalone (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

user−selectable minimum current level.

A

D

Status Outputs For LED or Host Processor

Interface Indicates Charge-In-Progress,

Charge Completion, Fault and AC-Adapter

Present Conditions

programmable charge timer provides a safety

backup safety for charge termination. The

bqSWITCHER automatically re-starts the charge

cycle if the battery voltage falls below an internal

threshold. The bqSWITCHER automatically

D

20-V Input Voltage Rating

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

D

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 is a trademark of Texas Instruments Incorporated.

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Copyright  2004, Texas Instruments Incorporated

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1

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SLUS606 − JUNE 2004

L

OUT

10 µH

bq24100RHL

IN OUT

R

(SNS)

V

IN

3

4

6

2

1

10 µF

C

OUT

10 µF

IN

OUT 20

VCC

PGND 17

STAT1 PGND 18

PACK+

19 STAT2

SNS 15

BAT 14

+

VTSB

5

7

PG

PACK−

R

(ISET1)

0.1 µF

TTC

ISET1

ISET2

8

9

C

TTC

(ISET2)

16 CE

R

T1

10 VSS

TS 12

TEMP

VTSB 11

BATTERY

PACK

R

T2

V

IN

V

IN

V

IN

D1

Adapter

Present

D3

Charge

D2

Done

UDG−04033

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.

ORDERING INFORMATION

(1)(2)

PART NUMBER

T

CHARGE REGULATION VOLTAGE (V)

4.2

INTENDED APPLICATION

Standalone

MARKINGS

CIA

J

bq24100RHLRE3

bq24103RHLRE3

bq24105RHLRE3

bq24113RHLRE3

bq24115RHLRE3

4.2 or 8.4

Standalone

CID

Externally programmable

1 or 2 cells selectable (CELLS pin)

Externally programmable

Standalone

CIF

−40°C to 125°C

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.

PACKAGE Dissipation Ratings

T

< 40°C

DERATING FACTOR

A

PACKAGE

θ

JA

POWER RATING

ABOVE T = 40°C

A

(2)

RHL

46.87 °C/W

1.81 W

0.021 W/°C

(2)

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.

2

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SLUS606 − JUNE 2004

(3)

ABSOLUTE MAXIMUM RATINGS

UNIT

Supply voltage range, (with respect to V

)

IN, VCC

20

SS

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

−0.3 to 20

OUT

−0.7 to 20

CMODE, TS, TTC

VTSB

7

Input voltage range, (with respect to V

SS

and PGND)

V

3.6

3.3

ISET1, ISET2

Voltage difference between SNS and BAT inputs

(V − V

1

)

SNS BAT

Output sink/source current

Output current

STAT1, STAT2, PG

OUT

10

mA

A

2.2

Operating free−air temperature range, T

−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

(3)

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

3.5

NOM

MAX UNIT

Supply voltage, V

CC

16.0

125

V

Operating junction temperature range, T

−40

°C

J

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

> V

,

PWM switching

PWM NOT switching

CE = HIGH

10

CC

CC(min)

mA

5

I

V

supply current

VCC(VCC)

CC(SLP)

CC

315

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)

µA

0°C ≤ T ≤ 65°C,

V

= 8.2 V

J

I(BAT)

I

Sleep current

V

CC

< V

or V

> V

but not in charge

(SLP)

CC

(SLP)

0°C ≤ T ≤ 65°C,

V

= 12.6 V

J

I(BAT)

V

CC

< V

or V

> V

but not in charge

(SLP)

CC

(SLP)

VOLTAGE REGULATION

CELLS = Low

CELLS = High

4.20

8.40

V

Output voltage

V

OREG

T

A

= 25°C

−0.5%

−1%

0.5%

1%

Voltage regulation accuracy

3

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SLUS606 − JUNE 2004

ELECTRICAL CHARACTERISTICS (continued)

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

J

PARAMETER

CURRENT REGULATION

TEST CONDITIONS

MIN

TYP

MAX

UNIT

V

≤ V

− V

≤ V ,

OREG

LOWV

(VCC)

I(BAT)

I

Output current range

150

2000

mA

O(OUT)

> V

(DO−MAX)

V

≥ V

,V

≤ V ,

≤ V

(VCC)

CC(min) LOWV I(BAT) OREG

≥ V

+

,

I(BAT) V(DO−MAX)

Over output current range. Does not include er-

Current regulation accuracy

−10%

100

10%

200

ror induced by the tolerance of resistor, R

, on

SET

the ISETx pin, or the sense resistor, R

(SNS)

Current regulation differential

threshold voltage range

V

− V

, V

≥V

OREG

+V

,

I(SNS)

LOWV

I(BAT) (VCC) I(BAT) DO−MAX

≤ V

V

K

mV

V

IREG

≤ V

I(BAT)

V

≥ V

,V

≤V

(VCC)

CC(min) (LOWV) I(BAT) O(REG)

Output current set voltage

Output current set factor

1

(ISET1)

≥ V

+

,

I(BAT) V(DO−MAX)

V

≥ V

V, ≤ V

≤ V

(VCC)

(VCCmin)LOWV I(BAT) O(REG)

I(BAT) V(DO−MAX)

1000

V/A

+

,

PRE-CHARGE AND SHORT-CIRCUIT CURRENT REGULATION

Precharge to fast-charge transition

voltage threshold, BAT

V

t

68.0% 71.4% 75.0% V_O(REG)

LOWV

Deglitch time for precharge to fast

charge transition

Rising voltage; t

2 mV overdrive

, t

RISE FALL

= 100 ns,

20

15

30

40

ms

I

Precharge range

V

< V

, t < t

200

mA

mV

V/A

OPRECHG

I(BAT)

LOWV

PRECHG

V

Precharge set voltage, ISET2

Precharge current set factor

100

(ISET2)

I(BAT)

LOWV

PRECHG

K

1000

Precharge current regulation

accuracy

0 V ≤ V

10 mV ≤ [V

< V

I(BAT)

LOWV,

− V

−20%

20%

] ≤ 100 mV

I(BAT)

I(SNS)

V

Short-circuit voltage threshold, BAT

Short-circuit current

V

falling

1.95

35

2.00

2.05

65

V/cell

mA

SHORT

I(BAT)

I

V

≤ V

SHORT

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

100

mV

V/A

TERM

RCH

Termination current set factor

Charger termination accuracy

1000

(ISET2)

V

< V

I(BAT)

RCH,

−20%

20

20%

40

10 mV ≤ [V

− V

] ≤ 100 mV

I(SNS)

I(BAT)

Both rising and falling,

, t = 100 ns

2 mV overdrive

t

Deglitch time for charge termination

30

ms

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,

2 mV overdrive

t

20

30

40

ms

V

t

, t

= 100 ns

RISE FALL

V

> 4.5 V,

C

= 0.1 µF,

CC

O(VTSB)

C

O(VTSB)

V

Output voltage

3.15

O(VTSB)

I

= 10 mA

(VTSB)

> 4.5 V,

V

I

CC

V

Voltage regulation accuracy

−10%

10%

= 10 mA

(VTSB)

4

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SLUS606 − JUNE 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

BATTERY RECHARGE THRESHOLD

V

Recharge threshold voltage

Below V

OREG

75

20

100

30

125 mV/cell

RCH

V

< decreasing below threshold,

I(BAT)

= 100 ns

t

Deglitch time

40

ms

V

t

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

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

CC

IL

V

s

= 20 µA

V

IH

TTC INPUT

t

Precharge timer

1440

25

1800

2160

PRECHG

Programmable charge timer range

Charge timer accuracy

Timer multiplier

t

= C

K

480 minutes

10%

CHARGE

(CHG)

(TTC) × (TTC)

−10%

K

155

200

s/nF

PROG

C

Charge time capacitor range

TTC enable threshold voltage

0.001

0.22

µF

PROG

V

rising

mV

TTC_EN

(TTC)

SLEEP COMPARATOR

V

≤

V

≤

CC

2.3 V ≤ V

≤ V

OREG

V

I(OUT)

+5 mV

+75mV

V

Sleep-mode entry threshold

V

SLP−ENT

V

≤

V

≤

CC

(1)

V

= 12.6 V,

R

= 1 kΩ

IN

V

I(OUT)

−4 mV

+73mV

V

t

Sleep-mode exit hysteresis,

Deglitch time for sleep mode

2.3 V ≤ V

≤ V

OREG

40

20

160

mV

SLP−EXIT

I(OUT)

V

decreasing below threshold,

= 100 ns, 10 mV overdrive, PMOS turns off

CC

5

µs

t

FALL

V

increasing below threshold,

= 100 ns, 10 mV overdrive, STATx pins

CC

t

30

40

ms

FALL

turn off

UVLO

V

Turn-on threshold voltage

Turn-on hysteresis

Rising

Falling

3.15

120

3.30

150

3.50

V

OVLO−ON

mV

PWM

7 V ≤ V

≤ V

400

500

130

150

Internal P-channel MOSFET on-

resistance

CC

CC(max)

4.5 V ≤ V

CC

≤ 7 V

mΩ

7 V ≤ V

CC

≤ V

Internal N-channel MOSFET on-

resistance

CC(max)

4.5 V ≤ V

CC

≤ 7 V

f

Oscillator frequency

Frequency accuracy

Maximum duty cycle

Minimum duty cycle

1.1

MHz

OSC

9%

0%

D

100%

MAX

MIN

(1)

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

IN

5

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SLUS606 − JUNE 2004

ELECTRICAL CHARACTERISTICS NIL

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

< V

2

mA

DETECT

I(BAT) OREG

I

t

I

t

Discharge current

Discharge time

Wake current

Wake time

V

< V

400

1

µA

s

DISCHRG1

WAKE

SHORT

I(BAT)

OREG

2

mA

s

0.5

WAKE

Begins after termination detected,

≤ V

I

Termination discharge current

400

262

10

µA

ms

µF

DISCHRG2

V

I(BAT)

OREG

t

Termination time

Required output ceramic capacitor

from BAT to V

SS

4.7

47

PROTECTION

Threshold over V

OREG

to turn−off P−channel

MOSFET, STAT1 and STAT2 during charge or

termination states

V

OVP

OVP threshold voltage

110

117

3.6

121 V_O(REG)

Cycle-by-cycle current limit

2.6

50

4.5

A

N-channel MOSFET current turn-off

threshold voltage

400

mA

V

Short-circuit voltage threshold, BAT

Short-circuit current

Thermal trip

V

falling

1.95

35

2.00

2.05

65

V/cell

mA

SHORT

I(BAT)

I

≤ V

SHORT

I(BAT)

T

165

10

SHTDWN

°C

Thermal hysteresis

RHL PACKAGE

(BOTTOM VIEW)

19

18

17

16

15

14

13

12

2

3

4

5

6

7

8

9

20

1

11

10

6

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SLUS606 − JUNE 2004

TERMINAL FUNCTIONS

TERMINAL

NO.

I/O

Description

NAME

bq24100 bq24103 bq24105 bq24113 bq24115

Battery voltage sense input. Bypass it with a capacitor close to

the pin.

BAT

14

I

Charger enable input. This active low input is used to suspend

charge and place the device in the low-power sleep mode. Do

not pull up this input to VTSB.

CE

16

Available on parts with fix output voltage. Ground or float for

single cell operation (4.2 V). For two cells operation (8.4 V) pull

CELLS

CMODE

FB

13

7

I

up this pin with a resistor to V

.

CC

Charge mode selection: low for precharge as set by ISET2 pin

and high 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 high-level CMODE signal

forces this condition, but if the battery voltage reaches the regu-

lation set point, bqSWITCHER changes to voltage regulation

regardless of CMODE input.

ISET2

9

I/O

N/C

13

1

19

1

19

1

−

O

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

1

OUT

Charge current output inductor connection.

20

Powergood status output (open drain). The transistor turns on

when a valid V

is detected. It is turned−off in the sleep mode.

CC

PG

5

O

PG can be used to drive a LED or communicate with a host

processor.

PGND

SNS

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 resis-

tor in series with the battery pack.

15

2

15

2

I

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

on indicates charge in process. When it is off and in conjunction

with the condition of STAT2 indicates various charger conditions

(See Figure 6)

STAT1

STAT2

2

O

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

on indicates charge is done. When it is off and in conjunction

with the condition of STAT1 indicates various charger conditions

(See Figure 6)

19

O

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.

TS

12

7

12

7

12

7

12

I

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

7

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ꢉ

SLUS606 − JUNE 2004

TERMINAL

NO.

bq24100 bq24103 bq24105 bq24113 bq24115

I/O

Description

NAME

VCC

VSS

6

I

Analog device input

Analog ground input

10

TS internal bias regulator voltage. Connect capacitor (with a

value between a 0.1µF 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 con-

nected to the same potential as the VSS pin on the printed cir-

cuit board, Do not use the thermal pad as the primary ground

Exposed

Thermal

Pad

input for the V . VSS pin must be connected to ground all the

CC

times.

8

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SLUS606 − JUNE 2004

FUNCTIONAL BLOCK DIAGRAM

IN

OUT

V

I(SET1)

ISET1

ISET2

I(SET2)

VCC

Feedforward

See Terminal Functions

CELLS.

FB, NC

PWM

Controller

SNS

+

I

REG

V

REG

Charge

Enable

BAT

V

Precharge

Control

I(BAT)

Reference

and Bias

Battery

Absent

Oscillator

Detection

VTSB

t

DETECT

FAULT

V

O(REG)

PGND

VSS

* V

(LTF)

Thermal Shutdown

TS

TTC

CE

* V

(HTF)

*

V

Sleep (AC)

I(BAT)

(TCO)

V

CC

V

Overvoltage

Recharge

Precharge

Terminate

Short

OVP

V

O(REG)

V

Charge Control,

Timer and

I(BAT)

Display Logic

V

PG

I(BAT)

V

I(SET2)

STAT1

V

I(BAT)

STAT2

*

V

I(SET2)

V

I(BAT)

Rising Edge

Falling Edge

*Signal

Deglitched

UDG−04034

9

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SLUS606 − JUNE 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

20

10

V

(BAT)

= 4.2 V

1 Cell

= 25°C

V

= 8.4 V

(BAT)

2 Cell

T = 25°C

A

T

A

0

0.5

1.0

1.5

2.0

0

0.5

O(CHARGE)

1.0

1.5

2.0

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−

R

(ISET1)

0.1 µF

16 CE

ISET1

ISET2

8

9

R

(ISET2)

R

10 VSS

T1

TS 12

TEMP

VTSB 11

BATTERY

PACK

R

T2

To System

UDG−04035

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

10

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SLUS606 − JUNE 2004

APPLICATION INFORMATION

POR

Check for battery

Presence

Battery

Present?

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

− Turn off charge

Replaced?

− Enable I

for

DISCHG

(Vbat > Vrch ?)

t_DISCHG2

Indicate Charge−

In−Progress

Yes

Charge Complete

V_BAT< V_RCH

?

No

Indicate DONE

Battery Removed

Yes

Indicate BATTERY

ABSENT

Figure 4. Standalone Version Operational Flow Chart

11

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SLUS606 − JUNE 2004

APPLICATION INFORMATION

POR

SLEEP MODE

Vcc > V

I(BAT)

No

checked at all times

Indicate SLEEP

MODE

No

Yes

/CE=Low

Yes

Regulate

I

O(PRECHG)

CMODE=Low

Yes

Indicate Charge−

In−Progress

No

Regulate Current

or Voltage

Yes

Indicate Charge−

In−Progress

No

CMODE=Low

Yes

CMODE=Low

No

/CE=High

Yes

Turn off charge

Indicate DONE

Yes

No

/CE=Low

Yes

Figure 5. System Controlled Operational Flow Chart

12

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ꢀ ꢁꢂ ꢃ ꢄ ꢅ ꢅ ꢆ ꢀ ꢁꢂ ꢃ ꢄ ꢅ ꢇ ꢆ ꢀꢁ ꢂꢃ ꢄꢅ ꢈ

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢇꢆ ꢀꢁ ꢂꢃ ꢄꢄꢈ

ꢉ

SLUS606 − JUNE 2004

APPLICATION INFORMATION

FUNCTIONAL DESCRIPTION FOR STANDALONE VERSION (bq2410x)

The bqSWITCHER supports a precision Li-Ion or Li-Pol charging system for single-, two- or three-cell

applications. See Figures 4 and 5 for an 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. 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

thresholds. If

(LTF)

(HTF)

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 pre−charge and fast charge)

(LTF)

(HTF)

the battery temperature must be within the V

-to-V

thresholds. If battery temperature is outside of this

(LTF)

(TCO)

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

-to-V

(HTF)

(LTF)

range. The bqSWITCHER suspends charge by turning off the PWM and holding the timer value (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

temperature-sensing feature.

-to-V

thresholds to TS pin disables the

(LTF)

(HTF)

13

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ꢀ ꢁ ꢂ ꢃꢄꢄ ꢇꢆ ꢀ ꢁ ꢂ ꢃꢄꢄ ꢈ

ꢉ

SLUS606 − JUNE 2004

APPLICATION INFORMATION

V

CC

Charge Suspend

V

(LTF)

Temperature Range

to Initiate Charge

Temperature Range

During Charge Cycle

V

(TS1)

V

(TCO)

Charge Suspend

V

SS

Figure 7. TS Pin Thresholds

Battery Preconditioning (Precharge)

Upon power−up, if the battery voltage is below the V

threshold, the bqSWITCHER applies a pre-charge

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 V

threshold is not reached within the timer period,

PRECHG

LOWV

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 replacement

DETECT DETECT

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

The magnitude of the pre−charge current, I , is determined by the value of programming resistor,

O(PRECHG)

R

, connected to the ISET2 pin.

(ISET2)

K

⁺ǒ_R

V

(ISET2)

I

O(PRECHG)

_(SNS)Ǔ

R

(ISET2)

(1)

where

D

R

V

is the external current sense resistor

is the output of the ISET2 pin

SNS

(ISET2)

K

V

is the output current set 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

O(CHARGE)

(SNS)

resistor, R

, connected to the ISET1 pin.

(ISET1)

In order to set the current, first R

resistor.

should be chosen based on the regulation threshold V

, across this

(2)

(SNS)

IREG

V

IREG

R

+

(SNS)

I

OCHARGE

14

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ꢉ

SLUS606 − JUNE 2004

APPLICATION INFORMATION

The value of R

I

is then calculated based on the following equation:

(ISET1)

K

V

(ISET1)

⁺ǒ_R

_(SNS)Ǔ

OPRECHG

R

ISET1

(3)

where

D

V

K

V

is the output of the ISET1 pin

is the output current set factor

(ISET1)

and K

are shown in the Electrical Characteristics table.

(ISET1)

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

1. Select the charge current.

Example design:

• I

= 2 A

OCHARGE

= 200mA

OPRECHG

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

Example:

• Select R

= 0.050 Ω

I + 0.050 W 2 A + 0.1 V

OCHARGE

(SNS)

V

+ R

(SNS)

(4)

(5)

ǒ_I_OCHARGEǓ²

2

(

)

P

+ R

+ 0.050 W 2 A + 0.2 W

(SNS)

• Select 0805 or 1206 size rated at 0.25 W

3. Determine R

.

(ISET1)

• V

= 1 V

(ISET1)

• K

= 1000 V/A

(ISET1)

K

R

V

(ISET1)

1000 VńA 0.1 V

0.050 W 2 A

(ISET1)

R

+

+ 10 kW

(ISET1)

I

(SNS)

OCHARGE

(6)

(7)

4. Determine R

(ISET2)

= 0.1 V

• V

• K

(ISET2)

= 1000V/A

(ISET2)

K

R

V

(ISET2)

1000 VńA 0.1 V

0.050 W 2 A

(ISET2)

R

+

+ 10 kW

(ISET2)

I

(SNS)

OPRECHG

15

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SLUS606 − JUNE 2004

APPLICATION INFORMATION

R

SENSE

SNS

BAT

V

= 1 V

(ISET1)

ISET1

I

(ISET1)

R

(ISET1)

= 0.1 V

V

(ISET2)

ISET2

R

I

(ISET2)

VSS

(ISET2)

UDG−04036

Figure 8. Program Charge Currrent 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 (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 remains connected directly to the battery

output voltage for current sensing with respect to SNS.

Charge Termination And Recharge

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

threshold, I

by the value of programming resistor, R

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

TERM

, 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 output current set factor

(SNS)

TERM

K

(ISET2)

V

and K

are specified in the Electrical Characteristics table

TERM

(ISET2)

16

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ꢀ ꢁꢂ ꢃ ꢄꢄ ꢇꢆ ꢀꢁ ꢂꢃ ꢄꢄꢈ

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SLUS606 − JUNE 2004

APPLICATION INFORMATION

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

programmed by the value of resistor and capacitor connected to the TTC pin and 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)

Charge timer can be disabled or reset by floating the TTC pin.

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 as described below

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.

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

the open-drain transistor is turned off.

Table 1. Status Pins Summary

Charge State

STAT1

OFF

ON

STAT2

OFF

ON

(1)

Battery absent

Charge-in-progress

Charge complete

OFF

Charge suspend, timer fault, overvoltage or sleep mode

(1)

OFF

Device is in battery-detection mode.

PG Output

The open-drain PG (powergood) indicates when the AC adapter (i.e. V ) is present. The output turns ON when

CC

sleep-mode exit threshold, V

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

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

SLP−EXIT

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

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

17

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SLUS606 − JUNE 2004

APPLICATION INFORMATION

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.

Charge Done

No

V

< V

(RCH)

I(BAT)

Yes

Enable

I

(DETECT)

fort

(DETECT)

BATTERY

PRESENT,

Begin Charge

No

V

<V

I(BAT) (LOWV)

Yes

ApplyI

(PRECHG)

for t

(DETECT)

BATTERY

PRESENT,

Begin Charge

No

V

< V

(RCH)

I(BAT)

Yes

BATTERY

ABSENT

Figure 9. Battery Absent Detection

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

pre-charge threshold, V

, for a period of t

and checking to see if the battery voltage is below the

DETECT

. Following this, the precharge current, I

is applied for a period of t

LOWV

OPRECHG DETECT

and the battery voltage checked again to be 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.

18

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ꢀ ꢁꢂ ꢃ ꢄꢄ ꢇꢆ ꢀꢁ ꢂꢃ ꢄꢄꢈ

ꢉ

SLUS606 − JUNE 2004

APPLICATION INFORMATION

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. (see Figure 7)

LOWV

OREG

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

Charge voltage above recharge threshold (V

) and timeout fault occurs.

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 used

FAULT

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

FAULT

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

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

status of the CMODE input.

, the bqSWITCHER transitions to voltage regulation phase regardless of the

OREG

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, all power FETs are turned off.

19

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ꢀ ꢁ ꢂ ꢃꢄ ꢅ ꢅꢆ ꢀ ꢁ ꢂ ꢃꢄ ꢅ ꢇ ꢆ ꢀꢁ ꢂ ꢃ ꢄꢅ ꢈ

ꢀ ꢁ ꢂ ꢃꢄꢄ ꢇꢆ ꢀ ꢁ ꢂ ꢃꢄꢄ ꢈ

ꢉ

SLUS606 − JUNE 2004

APPLICATION INFORMATION

Inductor, Capacitor and Sense Resistor Selection Guidelines

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

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

Table 2. Output Components Summary

CHARGE CURRENT

Output inductor, L

0.5 A

22 µH

4.7 µF

0.20 Ω

1 A

2 A

4.7 µH

10 µH

10 µF

0.10 Ω

OUT

Output capacitor, C

22 µF (or 2 × 10 µH) ceramic

0.05 Ω

OUT

Sense resistor, R

(SNS)

20

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ꢀ ꢁꢂ ꢃ ꢄ ꢅ ꢅ ꢆ ꢀ ꢁꢂ ꢃ ꢄ ꢅ ꢇ ꢆ ꢀꢁ ꢂꢃ ꢄꢅ ꢈ

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢇꢆ ꢀꢁ ꢂꢃ ꢄꢄꢈ

ꢉ

SLUS606 − JUNE 2004

21

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型号：	BQ24113RHLRE3
厂家：	TEXAS INSTRUMENTS
描述：	IC IC,BATTERY MANAGEMENT,LLCC,20PIN,PLASTIC, Power Management Circuit
文件：	总22页 (文件大小：342K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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