POWER SELECTOR. bq24702 Datasheet

bq24702 Datasheet PDF


Part Number

bq24702

Description

MULTICHEMISTRY BATTERY CHARGER CONTROLLER AND SYSTEM POWER SELECTOR

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download bq24702 Datasheet


bq24702
www.ti.com
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

bq24702
bq24702
bq24703
SLUS553E – MAY 2003 – REVISED OCTOBER 2007
www.ti.com
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.
DESCRIPTION (CONTINUED)
The battery voltage limit can be programmed by using the internal 1.196-V, ±0.5% precision reference, making it
suitable for the critical charging demands of lithium-ion cells. Also, the bq24702/bq24703 provides an option to
override the precision reference and drive the error amplifier either directly from an external reference or from a
resistor divider off the 5 V supplied by the integrated circuit.
The selector function allows the manual selection of the system power source, battery or wall-adapter power.
The bq24702/bq24703 supports battery-conditioning and battery-learn cycles through the ACSEL function. The
ACSEL function allows manual selection of the battery or wall power as the main system power. It also provides
autonomous switching to the remaining source (battery or ac power) should the selected system power source
terminate (refer to Available Options table for the differences between the bq24702 and the bq24703). The
bq24702/bq24703 also provides an alarm function to indicate a depleted battery condition.
The bq24702/bq24703 PWM controller is ideally suited for operation in a buck converter for applications when
the wall-adapter voltage is greater than the battery voltage.
DISSIPATION RATINGS
MAXIMUM POWER DISSIPATION
(HIGH K BOARD)
vs
FREE-AIR TEMPERATURE
1.60
MAXIMUM POWER DISSIPATION
(LOW K BOARD)
vs
FREE-AIR TEMPERATURE
1.40
1.40
1.20
1
MAX Pd (W) @ 500 LFM
MAX Pd (W) @ 250 LFM
MAX Pd (W) @ 150 LFM
MAX Pd (W) @ 0 LFM
1.20 MAX Pd (W) @ 500 LFM
MAX Pd (W) @ 250 LFM
1 MAX Pd (W) @ 150 LFM
MAX Pd (W) @ 0 LFM
0.80
0.80
0.60
0.60
0.40
0.40
0.20
θJA = 89.37 C/W @ 0 LFM,
θJA = 77.98 C/W @ 150 LFM,
θJA = 73.93 C/W @ 250 LFM,
θJA = 68.23 C/W @ 500 LFM
0.20
θJA = 150.17 C/W @ 0 LFM,
θJA = 110.95 C/W @ 150 LFM,
θJA = 99.81 C/W @ 250 LFM,
θJA = 86.03 C/W @ 500 LFM
0
25
50
70
0
85 25
50
70
TA - Free-Air Temperature - °C
TA - Free-Air Temperature - °C
A. The JEDEC low K (1s) board design used to derive this data was a 3-inch × 3-inch, two layer board with 2 ounce
copper traces on top of the board.
B. The JEDEC high K (1s) board design used to derive this data was a 3-inch × 3-inch, multilayer board with 1 ounce
internal power and ground planes and 2 ounce copper traces on top and bottom of the board.
85
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Copyright © 2003–2007, Texas Instruments Incorporated
Product Folder Link(s): bq24702 bq24703





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