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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)
Adapter Current-Sense Amplifier
gm
CMRR
VICR
I(SINK)
IIB
V(SET)
AV
PARAMETER
Transconductance gain
Common-mode rejection ratio
Common-mode input voltage range (ACP)
Sink current (COMP)
Input bias current (ACP, ACN)
Input bias current accuracy ratio
(I(ACP), I(ACN))
AC current programming voltage (ACSET)
AC current set gain
Total ac current-sense mid-scale accuracy
Total ac current-sense full-scale accuracy
TEST CONDITIONS
See Note 1
COMP = 1 V, (ACP − ACN) = 10 mV
ACP = ACN = 28 V,
VCC = 28 V, ACSET = 2.5 V
ACP = ACN = 28 V, VCC = 28 V,
ACSET = 2.5 V, 0 TJ 125°C
0.65 V ACSET 2.5 V, 12 V ACP 20 V,
See Note 5
ACSET = 1.25 V, TJ = 25°C, See Note 6
ACSET = 1.25 V, See Note 6
ACSET = 2.5 V, TJ = 25°C, See Note 6
ACSET = 2.5 V, See Note 6
MIN
75
7.0
0.5
40
−3
0
24.5
−5%
−6%
−3.5%
−4%
TYP MAX UNIT
130 175 mA/V
90
dB
VCC V
1.5 2.5 mA
50
65
µA
0
3
2.5 V
25.3 26.5 V/V
5%
6%
3.5%
4%
Battery Voltage Error Amplifier
PARAMETER
TEST CONDITIONS
MIN TYP MAX
gm
Transconductance gain
CMRR Common-mode rejection ratio
See Note 1
75 135 175
90
VICR
VIT
BATSET common-mode input voltage range
Internal reference override input threshold voltage
I(SINK) Sink current COMP
COMP = 1 V,
(BATP − BATSET) = 10 mV,
BATSET = 1.25 V
1
2.5
0.20 0.25 0.35
0.5 1.5 2.5
V(FB)
NOTE:
TJ = 25°C
1.190 1.196 1.202
Error-amplifier precision reference voltage
TJ = 0°C to 85°C
1.183 1.196 1.203
TJ = −40°C to 125°C
1.178 1.196 1.204
5.
Calculation
of
the
ac
current:
IAC
+
ACSET
RSENSE
1
AV
6. Total ac-current set accuracy is based on the measured value of (ACP−ACN) = c, using the measured gain, AV.
Dc
+
ACSET
AV
,
Total accuracy in %
+
(Dm *
Dc
Dc)
100, I(ACP) * I(ACN) + 0
UNIT
mA/V
dB
V
V
mA
V
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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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