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BQ24702PW View Datasheet(PDF) - Texas Instruments

Part NameBQ24702PW TI
Texas Instruments TI
DescriptionMULTICHEMISTRY BATTERY CHARGER CONTROLLER AND SYSTEM POWER SELECTOR


BQ24702PW Datasheet PDF : 32 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
bq24702, bq24703
SLUS553D − MAY 2003 − REVISED JULY 2005
ELECTRICAL CHARACTERISTICS (CONTINUED)
(−40°C TJ 125°C, 7.0 VDC VCC 28 VDC, all voltages relative to Vss) (unless otherwise specified)
MOSFET Gate Drive
PARAMETER
TEST CONDITIONS
MIN
AC driver RDS(on) high
AC driver RDS(on) low
Battery driver RDS(on) high
Battery driver RDS(on) low
tda
Time delay from ac driver off to battery
driver on
VCC = 18 V, I(ACDRV) = 1 mA
VCC = 18 V, I(ACDRV) = 1 mA
VCC = 18 V, I(BATDRV) = 1 mA
VCC = 18 V, I(BATDRV) = 1 mA
ACSEL 2.4 V 0.2 V
TYP
85
55
315
70
1.2
MAX
150
110
600
115
UNIT
2 µs
tdb
Time delay from battery driver off to ac
driver on
ACSEL 0.2 V 2.4 V
2.4
3.3 µs
VOH PWM driver high-level output voltage
PWM driver RDS(on) high
VOL PWM driver low-level output voltage
PWM driver RDS(on) low
Selector
IO = −10 mA, VCC = 18 V
IO = −50 mA, VCC = 18 V
IO = 10 mA, VCC = 18 V
IO = 50 mA, VCC = 18 V
VCC −0.18
VCC −1.2
VCC −0.09
VCC −0.8
7
V
14
VHSP+0.1 VHSP+0.4
V
VHSP+0.6 VHSP+1.2
5
8.5
PARAMETER
V(ACPRES) AC presence detect voltage
VIT(ACPRES) AC presence hysteresis
td(ACPRES) Deglitch delay for adapter insertion
V(BATDEP) Battery depletion ALARM trip voltage
V(NOBAT)
t(BATSEL)
No battery detect, switch to ACDRV
Battery select time (ACSEL low to BATDRV low)
TEST CONDITIONS
−40°C to 85°C
See Note 8
−40°C to 85°C
bq24702 only, See Note 8
−40°C to 85°C
VS < BATP, 50% threshold,
ACSEL 2.4 V 0.2 V
MIN
1.194
1.208
1.194
1.208
0.869
0.880
TYP
1.246
1.246
1%
100
1.246
1.246
1
1
MAX
1.286
1.285
UNIT
V
µs
1.286
V
1.285
1.144
V
1.118
1
2.5
3.5 µs
t(ACSEL)
V(VS)
VIT(VS)
AC select time (ACSEL high to ACDRV low)
VS voltage to enable BATDRV
VS voltage hysteresis
Zero Volt Operation
ACSEL 0.2 V 2.4 V
BATP = 1 V
VS > BATP
1
2.5
3.5 µs
0.98
1 1.02 V
20
35
85 mV
rDS(on)
PARAMETER
Static drain source on-state resistance
zero volt operation threshold
TEST CONDITIONS
VCC = 7 V, TJ = 125°C, IO = 100 mA
BATDEP increasing
BATDEP decreasing
MIN
0.743
0.570
TYP
5.3
0.794
0.62
MAX
8.7
0.840
0.656
UNIT
V
NOTES: 8. Total battery current readback accuracy is based on the measured value of VIBAT, VIBATm, and the calculated value of VIBAT,
VIBATc, using the measured value of the transfer gain, GTR.
VIBATc + (SRP * SRN)
GTR
Total
Accuracy
in
%
+
VIBATm * VIBATc
VIBATm
100
9. Refer to Table 1 to determine the logic operation of the bq24702 and the bq24703.
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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.

FEATURES
● 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)

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