BQ24002 [TI]
SINGLE-CELL Li-ION CHARGE MANAGEMENT IC FOR PDAs AND INTERNET APPLIANCES; 单节锂离子电池充电管理IC ，用于PDA和互联网设备
| 型号： | BQ24002 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | SINGLE-CELL Li-ION CHARGE MANAGEMENT IC FOR PDAs AND INTERNET APPLIANCES |
| 文件： | 总23页 (文件大小：190K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
bq24001
bq24002
bq24003
www.ti.com
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
SINGLE-CELL Li-ION CHARGE MANAGEMENT IC FOR PDAs
AND INTERNET APPLIANCES
FEATURES
DESCRIPTION
D
Highly Integrated Solution With FET Pass
Transistor and Reverse-Blocking Schottky
and Thermal Protection
The bq2400x series ICs are advanced Li-Ion linear
charge management devices for highly integrated and
space-limited applications. They combine high-
accuracy current and voltage regulation; FET pass-
transistor and reverse-blocking Schottky; battery
conditioning, temperature, or input-power monitoring;
charge termination; charge-status indication; and
charge timer in a small package.
D
D
D
Integrated Voltage and Current Regulation
With Programmable Charge Current
High-Accuracy Voltage Regulation (±1%)
Ideal for Low-Dropout Linear Charger
Designs for Single-Cell Li-Ion Packs With
Coke or Graphite Anodes
The bq2400x measures battery temperature using an
external thermistor. For safety reasons, the bq2400x
inhibitscharge until the battery temperature is within the
user-defined thresholds. Alternatively, the user can
monitor the input voltage to qualify charge. The
bq2400xseries then charge the battery in three phases:
preconditioning, constant current, and constant
voltage. If the battery voltage is below the internal
low-voltage threshold, the bq2400x uses low-current
precharge to condition the battery. A preconditioning
timer is provided for additional safety. Following pre-
conditioning, the bq2400x applies a constant-charge
current to the battery. An external sense-resistor sets
the magnitude of the current. The constant-current
phase is maintained until the battery reaches the
charge-regulation voltage. The bq2400x then
transitions to the constant voltage phase. The user can
configure the device for cells with either coke or
graphiteanodes. The accuracy of the voltageregulation
is better than ±1% over the operating junction
temperature and supply voltage range.
D
D
D
Up to 1.2-A Continuous Charge Current
Safety-Charge Timer During Preconditioning
and Fast Charge
Integrated Cell Conditioning for Reviving
Deeply Discharged Cells and Minimizing Heat
Dissipation During Initial Stage of Charge
D
D
Optional Temperature or Input-Power
Monitoring Before and During Charge
Various Charge-Status Output Options for
Driving Single, Double, or Bicolor LEDs or
Host-Processor Interface
D
Charge Termination by Minimum Current and
Time
D
Low-Power Sleep Mode
D
Packaging: 5 mm × 5 mm MLP or 20-Lead
TSSOP PowerPAD
APPLICATIONS
Charge is terminated by maximum time or minimum
taper current detection
D
D
D
D
PDAs
Internet Appliances
MP3 Players
Digital Cameras
The bq2400x automatically restarts the charge if the
battery voltage falls below an internal recharge
threshold.
Pleasebe 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.
PowerPAD is a trademark of TexasInstruments.
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.
Copyright 2002, Texas Instruments Incorporated
bq24001
bq24002
bq24003
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
www.ti.com
Thesedeviceshavelimitedbuilt-inESDprotection.Theleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoamduring
storageor handling to prevent electrostatic damage to the MOS gates.
ORDERING INFORMATION
PACKAGE
CHARGE STATUS
CONFIGURATION
T
J
20-LEAD HTTSOP PowerPAD 20-LEAD 5 mm × 5 mm MLP
(1)
(2)
(PWP) (RGW)
bq24001PWP
bq24002PWP
bq24003PWP
bq24001RGW
bq24002RGW
bq24003RGW
SingleLED
2 LEDs
–40°C to 125°C
Single bicolor LED
(1)
(2)
The PWP package is available taped and reeled. Add R suffix to device type(e.g. bq24001PWPR)toorder. Quantities2500devicesperreel.
TheRGWpackageisavailabletapedandreeled. AddRsuffix to device type (e.g. bq24001RGWR) to order. Quantities3000devices perreel.
PACKAGE DISSIPATION RATINGS
T
≤ 25°C
DERATING FACTOR
A
PACKAGE
Θ
JA
Θ
JC
POWER RATING
ABOVE T = 25°C
A
(1)
PWP
30.88°C/W
31.41°C/W
1.19°C/W
1.25°C/W
3.238 W
0.0324W/°C
0.0318W/°C
(2)
RGW
3.183 W
(1)
(2)
Thisdata is based on using the JEDEC high-K board and topside traces, top and bottom thermal pad (6.5 × 3.4 mm), internal 1 oz power and
ground planes, 8 thermal via underneath the die connecting to ground plane.
This data is based on using the JEDEC high-K board and topside traces, top and bottom thermal pad (3.25 × 3.25 mm), internal 1 oz power
and ground planes, 9 thermal via underneath the die connecting to ground plane.
ABSOLUTE MAXIMUM RATINGS
overoperating free-air temperature range unless otherwise noted
(1)
bq24001
bq24002
bq24003
Supply voltage (Vcc with respect to GND)
13.5 V
13.5 V
Input voltage (IN, ISNS, EN, APG/THERM/CR/STAT1/STAT2, VSENSE, TMR SEL, VSEL) (all with respect to GND)
Output current (OUT pins)
2 A
Output sink/source current (STAT1 and STAT2)
10 mA
Operating free-air temperature range, T
–40°C to 70°C
–65°C to 150°C
–40°C to 125°C
300°C
A
Storage temperature range, T
stg
Junction temperature range, T
J
Lead temperature (Soldering, 10 sec)
(1)
Stressesbeyondthoselistedunder“absolutemaximumratings”maycausepermanentdamagetothedevice.Thesearestressratingsonly,and
functionaloperation 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 MAX
UNIT
V
Supply voltage, V
4.5
4.5
10
10
CC
Input voltage, VIN
V
Continuousoutputcurrent
Operatingjunctiontemperaturerange, T
1.2
125
A
–40
°C
J
2
bq24001
bq24002
bq24003
www.ti.com
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
ELECTRICAL CHARACTERISTICS
over recommended operating junction temperature supply and input voltages, and V (V ) ≥ V (IN) ( unless otherwise noted)
I
CC
I
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
mA
µA
V
V
current
V
> V _UVLO,
CC
EN ≤ V
IH(EN)
1
CC
CC
current, standby mode
EN ≤ V
EN ≤ V
1
CC
IL(EN)
IN current, standby mode
10
4
µA
IL(EN)
V
CC
< V _UVLO,
CC
V
= 4.3 V, VSENSE = 4.3V
= 4.3 V, VSENSE = 4.3 V
2
2
Standby current (sum of currents into OUT
and VSENSE pins)
OUT
µA
EN <= Vil
EN,
V
OUT
4
VOLTAGE REGULATION, 0°C ≤ T ≤ 125°C
J
PARAMETER
TEST CONDITIONS
0 < I ≤ 1.2 A
MIN
4.059
4.158
TYP
MAX
UNIT
V
VSEL = V
,
4.10 4.141
4.20 4.242
SS
O
Outputvoltage
VSEL = V
,
0 < I ≤ 1.2 A
V
CC
1 mA ≤ I ≤ 1.2 A,
O
V
= 5 V,
O
=5 V,
I(IN)
Loadregulation
Lineregulation
1
mV
V
CC
T = 25°C
J
V
+V +V
OUT DO ilim(MAX)
= 1.0 A,
< V
< 10 V, T = 25°C
0.01
0.7
%/V
V
I(VCC)
J
I
O
I
O
4.9 V <V
< 10 V
I(Vcc)
Dropout voltage = VI(IN)-Vout
= 1.2 A,
V +V +V
OUT DO ilimMAX I(VCC)
<V
< 10 V
0.8
V
CURRENT REGULATION, 0°C ≤ T ≤ 125°C
J
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Current regulation threshold, V
VSENSE < V
0.095
0.1 0.105
V
I(limit)
O(VSEL-LOW/HIGH)
VSENSE pulsed above VVLOWV to I = 10% of
O
Delay time
1
ms
ms
(1)
regulatedvalue
I
R
increasing from 10% to 90% of regulated value.
O
Rise time
0.1
1
(1)
≥ 0.2 Ω,
SNS
(1)
Specified by design, not production tested.
CURRENT SENSE RESISTOR, 0°C ≤ T ≤ 125°C
J
PARAMETER
TEST CONDITIONS
100 mA ≤ Ilim ≤ 1.2 A
MIN
TYP
MAX
UNIT
Externalcurrentsenseresistorrange(R
)
0.083
1
Ω
SNS
PRECHARGE CURRENT REGULATION, 0°C ≤ T ≤ 125°C
J
PARAMETER
TEST CONDITIONS
0.083 ≤ R ≤ 1.0 Ω
MIN
TYP
MAX
UNIT
Prechargecurrentregulation
V
<V
40
60
80
mA
SENSE LOWV,
SNS
V
UVLO COMPARATOR, 0°C ≤ T ≤ 125°C
J
CC
PARAMETER
TEST CONDITIONS
TEST CONDITIONS
TEST CONDITIONS
MIN
4.35
4.25
50
TYP
4.43
4.33
MAX
4.50
4.40
UNIT
V
Startthreshold
Stopthreshold
Hysteresis
V
mV
APG/THERM COMPARATOR, 0°C ≤ T ≤ 125°C
J
PARAMETER
Upper trip threshold
Lower trip threshold
Input bias current
MIN
TYP
MAX
UNIT
V
1.480 1.498 1.515
0.545 0.558 0.570
1
V
µA
LOWV COMPARATOR, 0°C ≤ T ≤ 125°C
J
PARAMETER
Startthreshold
MIN
2.80
3.00
100
TYP
2.90
3.10
MAX
3.00
3.20
UNIT
V
Stopthreshold
V
Hysteresis
mV
3
bq24001
bq24002
bq24003
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
www.ti.com
ELECTRICAL CHARACTERISTICS CONTINUED
over recommended operating junction temperature supply and input voltages, and V (V ) ≥ V (IN) ( unless otherwise noted)
I
CC
I
HIGHV (RECHARGE) COMPARATOR, 0°C ≤ T ≤ 125°C
J
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Startthreshold
3.80
3.90
4.00
V
OVERV COMPARATOR, 0°C ≤ T ≤ 125°C
J
PARAMETER
Startthreshold
TEST CONDITIONS
MIN
4.35
4.25
50
TYP
4.45
4.30
MAX
4.55
4.35
UNIT
V
Stopthreshold
V
Hysteresis
mV
TAPERDET COMPARATOR, 0°C ≤ T ≤ 125°C
J
PARAMETER
TEST CONDITIONS
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Tripthreshold
12
18.5
25
mV
EN LOGIC INPUT, 0°C ≤ T ≤ 125°C
J
PARAMETER
High-levelinputvoltage
MIN
TYP
TYP
MAX
UNIT
V
2.25
Low-levelinputvoltage
0.8
V
Inputpulldownresistance
100
200
kΩ
VSEL LOGIC INPUT, 0°C ≤ T ≤ 125°C
J
PARAMETER
High-levelinputvoltage
TEST CONDITIONS
MIN
MAX
UNIT
V
2.25
Low-levelinputvoltage
0.8
V
Inputpulldownresistance
100
200
kΩ
TMR SEL INPUT 0°C ≤ T ≤ 125°C
J
PARAMETER
High-levelinputvoltage
Low-levelinputvoltage
Input bias current
TEST CONDITIONS
MIN
TYP
MAX
UNIT
V
2.7
0.6
15
V
V
≤ 5V
µA
I(TMR SEL)
STAT1, STAT2 (bq24001, bq24003), 0°C ≤ T ≤ 125°C
J
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
1.5
UNIT
V
Output (low) saturation voltage
Output (low) saturation voltage
Output (high) saturation voltage
Output (high) saturation voltage
Output turn on/off time
I
O
I
O
I
O
I
O
I
O
= 10 mA
= 4 mA
0.6
V
= –10 mA
V
CC
V
CC
–1.5
–0.5
V
= –4 mA
V
(1)
= ± 10 mA, C = 100 p
100
µs
(1) Assured by design, not production tested.
POWER-ON RESET (POR), 0°C ≤ T ≤ 125°C
J
PARAMETER
POR delay
TEST CONDITIONS
MIN
1.2
25
TYP
MAX
3
UNIT
ms
See Note 1
See Note 1
PORfalling-edgedeglitch
75
µs
(1) Assured by design, not production tested.
4
bq24001
bq24002
bq24003
www.ti.com
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
ELECTRICAL CHARACTERISTICS CONTINUED
over recommended operating junction temperature supply and input voltages, and V (V ) ≥ V (IN) ( unless otherwise noted)
I
CC
I
APG/THERM DELAY, 0°C ≤ T ≤ 125°C
J
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
APG/THERMfalling-edgedeglitch
See Note 1
25
75
µs
(1) Assured by design, not production tested.
TIMERS, 0°C ≤ T ≤ 125°C
J
PARAMETER
TEST CONDITIONS
MIN
–15%
–20%
TYP
MAX
15%
20%
UNIT
T
A
= 25°C
User-selectable timer accuracy
Precharge and taper timer
22.5
minute
THERMAL SHUTDOWN, 0°C ≤ T ≤ 125°C
J
PARAMETER
Thermaltrip
TEST CONDITIONS
MIN
TYP
165
10
MAX
UNIT
°C
See Note 1
See Note 1
Thermalhysteresis
°C
(1) Assured by design, not production tested.
CR PIN, 0°C ≤ T ≤ 125°C
J
PARAMETER
TEST CONDITIONS
< 100 µA
MIN
TYP
MAX
UNIT
Outputvoltage
0 < I
2,816
2.85
2.88
V
O(CR)
PIN ASSIGNMENTS
bq24002,bq24003
PWP PACKAGE
(TOP VIEW)
bq24001
PWP PACKAGE
(TOP VIEW)
1
20
19
18
17
16
15
14
13
12
11
N/C
IN
IN
N/C
OUT
OUT
VSENSE
AGND
STAT2
STAT1
TMR SEL
CR
1
2
3
4
5
6
7
8
9
20
19
18
17
16
15
14
13
12
11
N/C
IN
IN
N/C
OUT
OUT
VSENSE
AGND
N/C
STAT1
TMR SEL
CR
2
3
4
V
CC
V
CC
5
ISNS
N/C
APG/THERM
EN
ISNS
6
N/C
APG/THERM
EN
7
8
9
VSEL
GND/HEATSINK
VSEL
GND/HEATSINK
10
N/C
10
N/C
N/C – Do not connect
5
bq24001
bq24002
bq24003
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
www.ti.com
bq24001
RGW PACKAGE
(TOP VIEW)
bq24002,bq24003
RGW PACKAGE
(TOP VIEW)
EN 6
VSEL 7
GND 8
CR 9
20 N/C
19 N/C
18 N/C
17 OUT
EN 6
VSEL 7
GND 8
CR 9
20 N/C
19 N/C
18 N/C
17 OUT
N/C
OUT
N/C
OUT
16
10
16
10
N/C – Do Not Connect
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
AGND
NO.
NO.
14
5
16
7
Groundpin; connect close to the negative battery terminal.
Adapter power good input/thermistor sense input
Internal regulator bypass capacitor
APG/THERM
I
I
I
CR
EN
12
8
9
6
Charge-enableinput.Active-highenableinputwithinternalpulldown.Low-currentstand-bymode
active when EN is low.
GND/HEATSINK
10
2, 3
5
8
1, 2
4
Ground pin; connect to PowerPAD heat-sink layout pattern.
Input voltage. This input provides the charging voltage for the battery.
Current sense input
IN
I
I
ISNS
N/C
1, 6, 11, 10, 13,
Noconnect. Thesepinsmustbeleftfloating. Pin15isN/Conbq24001PWPonly. Pin 13 is N/Con
bq24001RGWonly.
15, 20
18, 19
14
18–20
16, 17
12
OUT
O
O
O
I
Charge current output
STAT1
STAT2
TMR SEL
Status display output 1
15
13
Status display output 2 (for bq24002 and bq24003 only)
Charge timer selection input
13
11
V
CC
4
3
I
Supplyvoltage
VSEL
9
7
I
4.1 V or 4.2 V charge regulation selection input
Battery voltage sense input
VSENSE
17
15
I
6
bq24001
bq24002
bq24003
www.ti.com
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
FUNCTIONAL BLOCK DIAGRAM
OUT
IN
+
–
VSENSE
TaperDet
0.2*V
ilim
+
–
–
+
ISNS
V
ilim
V
CC
V
ref
AGND
+
ChargeOK
LowV
UVS
Precharge
–
GND/
HEATSINK
V
uvlo
+
–
OverV
ChipEN
EN
+
–
HighV
LowV
H: V
L: V
= 4.2 V/Cell
= 4.1 V/Cell
Bias and
Ref
Generator
reg
reg
VSEL
R9
R8
–
+
Power On
Delay
V
ref
V
uvlo
V
ref
+
–
APG/
THERM
CLRFLT
+
–
PWRDWN
Thermal
Shutdown
UVS
V
V
CC
TaperDet
STAT1
STAT2
PWRDWN
PWRDWN
OSC
CC
Charge Control, Charge Timer
and
DisplayLogic
TMR SEL
REG
CR
Two Open
Drain
Outputs
for
ChargeOK
bq24002
7
bq24001
bq24002
bq24003
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
www.ti.com
TYPICAL CHARACTERISTICS
OUTPUT VOLTAGE
vs
OUTPUT VOLTAGE
vs
OUTPUT CURRENT
JUNCTION TEMPERATURE
4.24
4.24
V
IN
= 5 V
V
T
= 5 V
= 25°C
IN
A
4.22
4.20
4.18
4.16
4.14
4.12
4.10
4.08
4.06
4.22
4.20
4.18
4.16
4.14
4.12
4.10
4.08
4.06
V
SEL
= V
CC
V
= V
CC
SEL
V
SEL
= V
SS
V
SEL
= V
SS
–50
0
50
100
150
0
200
400
600
800
1000
1200
T – Junction Temperature – °C
J
I
O
– Output Current – mA
Figure 1
Figure 2
OUTPUT VOLTAGE
vs
CURRENT SENSE VOLTAGE
vs
INPUT VOLTAGE
INPUT VOLTAGE
4.24
4.22
4.20
4.18
4.16
4.14
4.12
4.10
4.08
4.06
103
102
101
100
99
I
T
= 100 mA
= 25°C
I
T
= 100 mA
= 25°C
O
A
O
A
V
= V
CC
SEL
V
= V
SS
SEL
98
97
5
6
7
8
9
10
5
6
7
8
9
10
V – Input Voltage – V
I
V – Input Voltage – V
I
Figure 3
Figure 4
8
bq24001
bq24002
bq24003
www.ti.com
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
TYPICAL CHARACTERISTICS
CURRENT SENSE VOLTAGE
QUIESCENT CURRENT
vs
vs
JUNCTION TEMPERATURE
INPUT VOLTAGE
103
0.5
0.4
0.3
0.2
0.1
0.0
I
T
= 100 mA
= 25°C
T
A
= 25°C
O
A
102
101
100
99
V
V
= 10 V
CC
= 5 V
CC
98
–50
0
50
100
150
5
6
7
8
9
10
T – Junction Temperature – °C
J
V – Input Voltage – V
I
Figure 5
Figure 6
QUIESCENT CURRENT
(POWER DOWN)
vs
DROPOUT VOLTAGE
vs
INPUT VOLTAGE
INPUT VOLTAGE
600
30
25
20
15
10
5
T
A
= 25°C
T
A
= 25°C
500
400
300
200
100
0
1200 mA
800 mA
400 mA
100 mA
0
4.5
5.5
6.5
7.5
8.5
9.5
5
6
7
8
9
10
V – Input Voltage – V
I
V – Input Voltage – V
I
Figure 7
Figure 8
9
bq24001
bq24002
bq24003
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
www.ti.com
TYPICAL CHARACTERISTICS
DROPOUT VOLTAGE
vs
DROPOUT VOLTAGE
vs
OUTPUT CURRENT
JUNCTION TEMPERATURE
600
500
400
300
200
100
0
800
700
600
500
400
300
200
100
I
O
= 1.2 A
T
A
= 25°C
V
= 5 V
IN
V
= 5 V
CC
V
= 10 V
IN
V
CC
= 10 V
0
200
400
600
800
1000
1200
–50
0
50
100
150
I
O
– Output Current – mA
T – Junction Temperature – °C
J
Figure 9
Figure 10
REVERSE CURRENT
vs
REVERSE CURRENT LEAKAGE
vs
JUNCTION TEMPERATURE
VOLTAGE ON OUT PIN
6
5
4
3
2
1
0
4.0
V
OUT
= 4.3 V
T
A
= 25°C
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
–50
0
50
100
150
5
6
7
8
9
10
T – Junction Temperature – °C
J
V
O
– Voltage on Out Pin – V
Figure 11
Figure 12
10
bq24001
bq24002
bq24003
www.ti.com
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
APPLICATION INFORMATION
U1
V
CC
1
2
20
R1
0.1 Ω
N/C
IN
N/C
OUT
19
18
17
16
15
14
13
12
11
DC+
PACK+
C1
10 µF
V
CC
3
+
IN
OUT
+
4
–
V
CC
VSENSE
AGND
STAT2
DC–
5
ISNS
N/C
PACK–
6
C4
1 µF
C2
0.1 µF
7
APG/THM STAT1
8
EN
TMR SEL
CR
TEMP
9
Battery
Pack
VSEL
GND
V
CC
C3
0.22 µF
10
N/C
R4
bq24002PWP
500 Ω
D1
D2
R5
500 Ω
R2
18.7 kΩ
R3
95.3 kΩ
Figure 13. Li-Ion/Li-Pol Charger
11
bq24001
bq24002
bq24003
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
www.ti.com
APPLICATION INFORMATION
FUNCTIONAL DESCRIPTION
Thebq2400x supports a precision current- and voltage-regulated Li-Ion charging system suitable for cells with either coke
or graphite anodes. See Figure 14 for a typical charge profile and Figure 15 for an operational flowchart.
CurrentRegulation
Phase
Voltage Regulation and
Charge TerminationPhase
Preconditioning
Phase
Regulation Voltage
(V
)
OUT
RegulationCurrent
(I
)
lim
Charge Voltage
MinimumCharge
Voltage (LowV)
Preconditioning
Current (I
)
PRECHG
Charge Current
Taper Detect
22.5Minutes
Charge Timer (3, 4.5 or 6 Hours)
22.5Minutes
Figure 14. Typical Charge Profile
12
bq24001
bq24002
bq24003
www.ti.com
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
POR
Regulate
(PRECHG)
I
Yes
Reset and Start
22.5 min Timer
V
< V ?
(LOWV)
I(VSENSE)
Indicate Pre–
Charge
No
Reset All Timers,
Start Charge Timer
(TMR SEL input )
Yes
V
> V ?
(OVERV)
I(VSENSE)
No
Regulate Current
or Voltage
Indicate Charge
No
V
< V ?
(LOWV)
I(VSENSE)
Yes
Yes
V
> V ?
(OVERV)
I(VSENSE)
No
22.5min Timer
Expired?
No
Yes
Yes
Charge timer
Expired?
No
Fault Condition
Indicate Fault
Yes
V
< V ?
(LOWV)
I(VSENSE)
No
POR?
or
APG/THERM toggle?
No
Start 22.5 minute
Timer
or
Yes
Taper
Detected?
EN toggle?
Indicate DONE
Yes
No
22.5min Timer
Expired?
Yes
Turn Off Charge
Indicate DONE
V
< V
I(VSENSE)
or
?
(HIGHV)
No
POR?
or
APG/THERM Toggle?
or
EN Toggle?
Yes
Figure 15. Operational Flow Chart
13
bq24001
bq24002
bq24003
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
www.ti.com
either the adapter power or the battery temperature using
a thermistor. The bq2400x suspends charge if this input is
outside the limits set by the user. Please refer to the
APG/THERM input section for additional details.
Charge Qualification and Preconditioning
The bq2400x starts a charge cycle when power is applied
while a battery is present. Charge qualification is based on
battery voltage and the APG/THERM input.
APG/THERM Input
Thebq400x continuously monitors temperature or system
input voltage by measuring the voltage between the
APG/THERM (adapter power good/thermistor) and GND.
For temperature, a negative- or a positive- temperature
coefficient thermistor (NTC, PTC) and an external voltage
divider typically develop this voltage (see Figure 16). The
As shown in the block diagram, the internal LowV
comparator output prevents fast-charging a deeply
depleted battery. When set, charging current is provided
by a dedicated precharge current source. The precharge
timerlimits the precharge duration. The precharge current
alsominimizesheatdissipationinthepasselementduring
the initial stage of charge.
bq2400x compares this voltage against its internal V
TP1
and V
thresholds to determine if charging is allowed.
TP2
The APG/THERM input can also be configured to monitor
(See Figure 17.)
U1
1
2
20
19
18
17
16
15
14
13
12
11
N/C
IN
N/C
OUT
PACK+
PACK–
TEMP
3
IN
OUT
+
4
–
V
CC
VSENSE
AGND
STAT2
5
ISNS
N/C
6
NTCThermistor
BatteryPack
7
APG/THM STAT1
8
EN
TMR SEL
CR
9
VSEL
GND
C3
0.22 µF
10
N/C
bq24002PWP
RT1
RT2
Figure 16. Temperature Sensing Circuit
14
bq24001
bq24002
bq24003
www.ti.com
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
U1
V
CC
1
2
20
19
18
17
16
15
14
13
12
11
N/C
IN
N/C
OUT
DC+
3
Vcc
IN
OUT
4
V
CC
VSENSE
AGND
STAT2
Temp Fault
5
ISNS
N/C
6
R1
VTP1
7
APG/THM STAT1
Normal Temp Range
Temp Fault
8
VTP2
EN
TMR SEL
CR
R2
9
VSEL
GND
10
DC–
N/C
GND
bq24002PWP
Figure 17. Temperature Threshold
Figure 18. APG Sensing Circuit
Values of resistors R1 and R2 can be calculated using the following equation:
R2
V
+ V
CC
APG
(R1 ) R2)
where V
is the voltage at the APG/THM pin.
APG
Current Regulation
The bq2400x provides current regulation while the battery-pack voltage is less than the regulation voltage. The current
regulation loop effectively amplifies the error between a reference signal, Vilim, and the drop across the external sense
resistor, R
.
SNS
U1
V
CC
1
2
20
19
18
17
16
15
14
13
12
11
N/C
IN
N/C
OUT
OUT
R
SNS
DC+
C1
10 µF
V
CC
3
+
IN
4
V
CC
VSENSE
AGND
DC–
5
ISNS
N/C
6
STAT2
C2
0.1 µF
7
APG/THM STAT1
8
EN
TMR SEL
CR
9
VSEL
GND
10
N/C
bq24002PWP
Figure 19. Current Sensing Circuit
15
bq24001
bq24002
bq24003
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
www.ti.com
Charge current feedback, applied through pin ISNS,
maintains regulation around a threshold of Vilim. The
following formula calculates the value of the sense
The output stage is totem pole for the bq24001 and
bq24003 and open-drain for the bq24002. The following
tables summarize the operation of the three options:
resistor:
Table 1. bq24001 (Single LED)
Vilim
R
+
SNS
I
REG
CHARGE STATE
Precharge
STAT1
ON (LOW)
where I
is the desired charging current.
REG
Fast charge
ON (LOW)
Voltage Monitoring and Regulation
FAULT
Flashing (1 Hz, 50% duty cycle)
OFF (HIGH)
Done(>90%)
Sleep-mode
Voltageregulation feedback is through pin VSENSE. This
input is tied directly to the positive side of the battery pack.
The bq2400x supports cells with either coke (4.1 V) or
graphite (4.2 V) anode. Pin VSEL selects the charge
regulation voltage.
OFF (HIGH)
APG/Therminvalid
Thermalshutdown
Batteryabsent
OFF (HIGH)
OFF (HIGH)
OFF (HIGH)
VSEL State
(see Note)
CHARGE REGULATION
VOLTAGE
Table 2. bq24002 (2 Individual LEDs)
Low
4.1 V
4.2 V
STAT2
High
CHARGE STATE
STAT1 (RED)
(GREEN)
NOTE: VSEL should not be left floating.
Precharge
ON (LOW)
ON (LOW)
OFF
Fast charge
OFF
Charge Termination
Flashing (1 Hz,
50% duty cycle)
FAULT
OFF
The bq2400x continues with the charge cycle until
termination by one of the two possible termination
conditions:
Done(>90%)
OFF
OFF
OFF
OFF
OFF
ON (LOW)
OFF
Sleep-mode
Maximum Charge Time: The bq2400x sets the maximum
charge time through pin TMRSEL. The TMR SEL pin
allows the user to select between three different total
charge-time timers (3, 4, 5, or 6 hours). The charge timer
is initiated after the preconditioning phase of the charge
and is reset at the beginning of a new charge cycle. Note
thatinthecaseofafaultcondition,suchasanout-of-range
signal on the APG/THERM input or a thermal shutdown,
the bq2400x suspends the timer.
APG/Therminvalid
Thermalshutdown
Batteryabsent
OFF
OFF
(1)
OFF
(1) If thermistor is used, then the Green LED is off.
Table 3. bq24003 (Single Bicolor LED)
LED2
(GREEN)
APPARENT
COLOR
CHARGE STATE LED1 (RED)
Precharge
Fast charge
FAULT
ON (LOW)
ON (LOW)
ON (LOW)
OFF (HIGH)
OFF (HIGH)
OFF (HIGH)
OFF (HIGH)
ON (LOW)
ON (LOW)
OFF (HIGH)
RED
RED
TMRSEL STATE
CHARGE TIME
3 hours
(1)
Floating
YELLOW
GREEN
OFF
Low
6 hours
Done(>90%)
Sleep-mode
High
4.5 hours
(1)
To improve noise immunity, it is recommended that a minimum of
10 pF capacitor be tied to Vss on a floating pin.
APG/Therm
invalid
OFF (HIGH)
OFF (HIGH)
OFF (HIGH)
OFF (HIGH)
OFF
OFF
Minimum Current: The bq2400x monitors the charging
current during the voltage regulation phase. The bq2400x
initiates a 22-minute timer once the current falls below the
taperdet trip threshold. Fast charge is terminated once the
22-minute timer expires.
Thermal
shutdown
(1)
OFF (HIGH) OFF (HIGH)
(1)
OFF
Batteryabsent
(1) If thermistor is used, then the Green LED is off.
Charge Status Display
Thermal Shutdown
The three available options allow the user to configure the
charge status display for single LED (bq24001), two
individual LEDs (bq24002) or a bicolor LED (bq24003).
The bq2400x monitors the junction temperature T of the
J
DIE and suspends charging if T exceeds 165°C.
J
Charging resumes when T falls below 155°C.
J
16
bq24001
bq24002
bq24003
www.ti.com
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
DETAILED DESCRIPTION
VOLTAGE SENSE
POWER FET
The integrated transistor is a P-channel MOSFET. The
power FET features a reverse-blocking Schottky diode,
which prevents current flow from OUT to IN.
To achieve maximum voltage regulation accuracy, the
bq2400x uses the feedback on the VSENSE pin.
Externally, this pin should be connected as close to the
battery cell terminals as possible. For additional safety, a
10kΩ internal pullup resistor is connected between the
VSENSE and OUT pins.
An internal thermal-sense circuit shuts off the power FET
when the junction temperature rises to approximately
165°C. Hysteresis is built into the thermal sense circuit.
After the device has cooled approximately 10°C, the
power FET turns back on. The power FET continues to
cycle off and on until the fault is removed.
ENABLE (EN)
The logic EN input is used to enable or disable the IC. A
high-level signal on this pin enables the bq2400x. A
low-level signal disables the IC and places the device in a
low-power standby mode.
CURRENT SENSE
The bq2400x regulates current by sensing, on the ISNS
pin, the voltage drop developed across an external sense
resistor. The sense resistor must be placed between the
supply voltage (Vcc) and the input of the IC (IN pins).
17
bq24001
bq24002
bq24003
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
www.ti.com
THERMAL INFORMATION
THERMALLY ENHANCED TSSOP-20
DIE
The thermally enhanced PWP package is based on the
20-pin TSSOP, but includes a thermal pad (see
Figure 20)toprovideaneffectivethermalcontactbetween
the IC and the PWB.
Side View (a)
DIE
Traditionally, surface mount and power have been
mutually exclusive terms. A variety of scaled-down
TO220-type packages have leads formed as gull wings to
make them applicable for surface-mount applications.
These packages, however, suffer from several
shortcomings: they do not address the very low profile
requirements (<2 mm) of many of today’s advanced
systems, and they do not offer a pin-count high enough to
accommodate increasing integration. On the other hand,
traditional low-power surface-mount packages require
power-dissipation derating that severely limits the usable
range of many high-performance analog circuits.
End View (b)
Thermal
Pad
The PWP package (thermally enhanced TSSOP)
combines fine-pitch surface-mount technology with
thermal performance comparable to much larger power
packages.
Bottom View (c)
The PWP package is designed to optimize the heat
transfer to the PWB. Because of the very small size and
limited mass of a TSSOP package, thermal enhancement
isachievedbyimprovingthethermalconductionpathsthat
remove heat from the component. The thermal pad is
formed using a lead-frame design (patent pending) and
manufacturing technique to provide the user with direct
connection to the heat-generating IC. When this pad is
soldered or otherwise coupled to an external heat
dissipator, high power dissipation in the ultrathin,
fine-pitch, surface-mount package can be reliably
achieved.
Figure 20. Views of Thermally Enhanced
PWP Package
Because the conduction path has been enhanced,
power-dissipation capability is determined by the thermal
considerations in the PWB design. For example, simply
addingalocalizedcopperplane(heat-sinksurface), which
is coupled to the thermal pad, enables the PWP package
to dissipate 2.5 W in free air. (Reference Figure 22(a), 8
2
cm of copper heat sink and natural convection.)
Increasing the heat-sink size increases the power
dissipation range for the component. The power
dissipation limit can be further improved by adding airflow
to a PWB/IC assembly (see Figure 22(b) and 22(c)). The
2
line drawn at 0.3 cm in Figures 21 and 22 indicates
performance at the minimum recommended heat-sink
size.
18
bq24001
bq24002
bq24003
www.ti.com
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
THERMAL INFORMATION
THERMAL RESISTANCE
vs
COPPER HEAT-SINK AREA
150
125
100
NaturalConvection
50 ft/min
100 ft/min
150 ft/min
200 ft/min
75
50
25
250 ft/min
300 ft/min
0 0.3
1
2
3
4
5
6
7
8
2
Copper Heat-Sink Area – cm
Figure 21
19
bq24001
bq24002
bq24003
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
www.ti.com
THERMAL INFORMATION
3.5
3.5
T
A
= 25°C
T
A
= 55°C
300 ft/min
3
2.5
2
3
150 ft/min
300 ft/min
2.5
2
150 ft/min
NaturalConvection
1.5
1.5
NaturalConvection
1
0.5
0
1
0.5
0
0
2
4
6
8
0
2
4
6
8
0.3
0.3
2
2
Copper Heat-Sink Size – cm
Copper Heat-Sink Size – cm
(a)
(b)
3.5
T
A
= 105°C
3
2.5
2
1.5
1
150 ft/min
300 ft/min
NaturalConvection
6
0.5
0
0
2
4
8
0.3
2
Copper Heat-Sink Size – cm
(c)
Figure 22. Power Ratings of the PWP Package at Ambient Temperatures of 25°C, 55°C, and 105°C
20
bq24001
bq24002
bq24003
www.ti.com
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
MECHANICAL DATA
PWP (R-PDSO-G**)
PowerPAD PLASTIC SMALL-OUTLINE
20 PINS SHOWN
0,30
0,19
M
0,65
20
0,10
11
ThermalPad
(See Note D)
0,15 NOM
4,50
4,30
6,60
6,20
Gage Plane
1
10
0,25
A
0°–ā8°
0,75
0,50
SeatingPlane
0,10
0,15
0,05
1,20 MAX
PINS **
14
16
20
24
28
DIM
5,10
4,90
5,10
4,90
6,60
6,40
7,90
7,70
9,80
9,60
A MAX
A MIN
4073225/F10/98
NOTES:A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusions.
D. The package thermal performance may be enhanced by bonding the thermal pad to an external thermal plane.
This pad is electrically and thermally connected to the backside of the die and possibly selected leads.
E. Falls within JEDEC MO-153.
PowerPAD is a trademark of TexasInstruments.
21
bq24001
bq24002
bq24003
SLUS462D – SEPTEMBER 2000 – REVISED MAY 2002
www.ti.com
MECHANICAL DATA
RGW (S-PQFP-N20)
PLASTIC QUAD FLATPACK
5,15
4,85
5,15
4,85
Pin 1 Index
Area
Top and Bottom
1,00
0,80
0,20 REF.
SeatingPlane
0,05
0,00
0,08
3,25 SQ MAX
0,75
20X
0,65
0,35
5
1
20
6
16
10
Exposed Thermal Die
Pad
(See Note D)
11
15
0,38
20X
0,23
0,10
2,60
4204100/A01/02
NOTES:A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. Quad Flatpack, No-leads, (QFN) package configuration.
D. The package thermal performance may be enhanced by bonding the thermal die pad to an external thermal plane.
E. Falls within JEDEC M0-220.
22
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Copyright 2002, Texas Instruments Incorporated
相关型号：
BQ24002PWPTR
IC 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20, GREEN, PLASTIC, HTSSOP-20, Power Management Circuit
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