BQ24745_14 Datasheet, PDF (15/39 Pages) Texas Instruments – SMBus-Controlled Multi-Chemistry Battery

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bq24745
SLUS761D – DECEMBER 2007 – REVISED OCTOBER 2011
TYPICAL CHARACTERISTICS (continued)
NEAR 100% DUTY CYCLE BOOTSTRAP RECHARGE
PULSE
BATTERY SHORTED CHARGER RESPONSE,
OVERCURRENT PROTECTION (OCP) AND
CHARGE CURRENT REGULATION
UGATE
PHASE
VFB
I_(IND)
LGATE
t − Time = 400 ms/div
Figure 26.
CONTINUOUS CONDUCTION MODE (CCM)
SWITCHING WAVEFORMS, ICHARGE = 3986 mA
I_(IND)
UGATE
UGATE-PH
PH
LGATE
t − Time = 1 ms/div
Figure 28.
OFF-STATE BATTERY CURRENT (LOW Iq)
vs
VFB (BATTERY) VOLTAGE
7
6
5
4
3
Including current from:
2
DCIN, CSSP/N, VFB,
CSOP/N, BOOT, PHASE
1
0
0
5
10
15
20
25
VFB - Voltage - V
Figure 30.
I_(IND)
t − Time = 400 ms/div
Figure 27.
DISCONTINUOUS CONDUCTION MODE (DCM)
SWITCHING WAVEFORMS, ICHARGE = 256 mA
I_(IND)
UGATE
UGATE-PH
PH
LGATE
t − Time = 1 ms/div
Figure 29.
OFF-STATE DCIN CURRENT (LOW Iq)
vs
DCIN INPUT VOLTAGE (With Adapter Connected)
700
600
500
400
300
200
100
0
-100
0
Adapter Connected
ACIN > 2.4 V,
Charge Disabled by CE pin
CE = Low
5
10
15
20
25
DCIN - Voltage - V
Figure 31.
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