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Actual Size
(6,60 mm x 7,90
mm)
bq24702
bq24703
SLUS553E – MAY 2003 – REVISED OCTOBER 2007
MULTICHEMISTRY BATTERY CHARGER CONTROLLER AND
SYSTEM POWER SELECTOR
FEATURES
1
• Dynamic Power Management, DPM 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
• ±0.4% Charge Voltage Accuracy, Suitable for
Charging Li-Ion Cells
• ±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-μA Sleep Mode Current for Low Battery
Drain
• 24-Pin TSSOP Package and 5 mm × 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,
±0.6%, externally bypassed voltage reference
(VREF), supplied by the bq24702/bq24703.
bq24702, bq24703
PW PACKAGE
(TOP VIEW)
bq24703
RHD PACKAGE
(BOTTOM VIEW)
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 ACDRV
23 BATDRV
22 VCC
21 PWM
ACSEL 28
ACPRES 27
20 VHSP
ACDET 26
19 ALARM
18 VS
17 GND
ACDRV 25
BATDRV 24
16 SRP
NC 23
15 SRN
14 IBAT
VCC 22
13 BATP
NC - No internal connection
8 ACN
9 ACP
10 NC
11 NC
12 BATP
13 IBAT
14 NC
1
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 the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2003–2007, Texas Instruments Incorporated
