BQ24742 Datasheet, PDF (15/35 Pages) Texas Instruments – Li-Ion or Li-Polymer Battery Charger with Low Iq and Accurate Trickle Charge

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NEAR 100% DUTY CYCLE BOOTSTRAP RECHARGE PULSE
V_PH
V_HIDRV
bq24741, bq24742
SLUS875B – MARCH 2009 – REVISED OCTOBER 2009
EFFICIENCY
vs
BATTERY CHARGE CURRENT
100
4-Cell 16.8 V
95
3-Cell 12.6 V
90
V_LODRV
I_L
85
Time = 4 ms/div
Figure 27.
1200
1000
800
600
400
200
0
0
80
0
0.5
1
1.5
2
2.5
3
3.5
4
Charge Current (A)
Figure 28.
SWITCH FREQUENCY
vs
SETTING RESISTOR
Measurment
Calculation
50
100
150
200
250
300
R_FET (kOhm)
Figure 29.
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