bq24702, bq24703
Actual Size
(6,60 mm x 7,90 mm)
SLUS553D 鈭?MAY 2003 鈭?REVISED JULY 2005
MULTICHEMISTRY BATTERY CHARGER CONTROLLER
AND SYSTEM POWER SELECTOR
FEATURES
D
Dynamic Power Management, DPM
D
D
D
D
D
D
D
D
D
Minimizes Battery Charge Time
Integrated Selector Supports Battery
Conditioning and Smart Battery Learn Cycle
Zero Volt Operation
Selector Feedback Circuit Ensures
Break-Before-Make Transition
卤0.4%
Charge Voltage Accuracy, Suitable for
Charging Li-Ion Cells
卤4%
Charge Current Accuracy
300-kHz Integrated PWM Controller for
High-Efficiency Buck Regulation
Depleted Battery Detection and Indication to
Protect Battery From Over Discharge
20-碌A Sleep Mode Current for Low Battery
Drain
24-Pin TSSOP Package and 5 mm
脳
5 mm
QFN package (bq24703 only)
DESCRIPTION
The bq24702/bq24703 is a highly integrated battery
charge controller and selector tailored for notebook and
sub-notebook PC applications.
The bq24702/bq24703 uses dynamic power
management (DPM) to minimize battery charge time by
maximizing use of available wall-adapter power. This is
achieved by dynamically adjusting the battery charge
current based on the total system (adapter) current.
The bq24702/bq24703 uses a fixed frequency, pulse
width modulator (PWM) to accurately control battery
charge current and voltage. Charge current limits can
be programmed from a keyboard controller DAC or by
external resistor dividers from the precision 5-V,
卤0.6%,
externally bypassed voltage reference (VREF),
supplied by the bq24702/bq24703.
ENABLE
BATDEP
BATSET
6
SRSET
ACSET
bq24702, bq24703
PW PACKAGE
(TOP VIEW)
bq24703
RHD PACKAGE
(BOTTOM VIEW)
1
2
3
4
5
21
20
19
18
17
16
NC 鈭?No internal connection
PWM
VS
VHSP
SRP
ALARM
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.
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
铮?/div>
2003 鈭?2004, Texas Instruments Incorporated
GND
SRN
15
ACDET
ACPRES
ACSEL
BATDEP
SRSET
ACSET
VREF
ENABLE
BATSET
COMP
ACN
ACP
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
ACDRV
BATDRV
VCC
PWM
VHSP
ALARM
VS
GND
SRP
SRN
IBAT
BATP
ACSEL
ACPRES
ACDET
ACDRV
BATDRV
NC
VCC
7
COMP
VREF
28
27
26
25
24
23
22
8
9
10
11
12
13
14
ACN
ACP
NC
NC
BATP
IBAT
NC
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