BQ24250C_15 Datasheet, PDF (19/46 Pages) Texas Instruments – bq24250C 2A Single Input I2C, Standalone Switch-Mode Li-Ion Battery Charger with Power-Path Management

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Device Functional Modes (continued)
bq24250C
SLUSBY7 – JULY 2014
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
VV_BB_AA_T T
0.3
VV_SS_YY_S S
0.2
II_BB_AA_T T
0.1
0.0
2k 4k 6k 8k 10k 12k 14k 16k
Time (s)
C005
Figure 16. bq24250C Charge Profile while Charging a 2700 mAh Battery at a 1A Charge Rate
Figure 17 illustrates the precharge behavior of the above charge profile by narrowing the time axis to 0 – 120
seconds.
3.7
3.5
3.3
3.1
2.9
2.7
2.5
0
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
V_BB_AA_T T _0.3
V_SS_YY_SS _0.2
I_{BBAAT T}
0.1
0.0
20
40
60
80
100
120
Time (s)
C006
Figure 17. bq24250C Charge Profile While Charging a 2700-mAh Battery at a 1A Charge During
Precharge
8.4.2 EN1/EN2 Pins
The bq24250C is I²C and Stand Alone part. The EN1 and EN2 pins are available in this IC spin to support USB
2.0 compliance. These pins are used for Input Current Limit Configuration I. Set EN1 and EN2 to control the
maximum input current and enable USB compliance. See Table 1 below for programming details.
When the input current limit pins change state, the V_{IN_DPM} threshold changes as well. See Table 1 for the
detailed truth table:
Table 1. EN1, and EN2 Truth Table⁽¹⁾
EN2
EN1
Input Current Limit
0
0
500mA
0
1
Externally programmed by ILIM (up to 2.0A)
1
0
100mA
1
1
Input Hi-Z
4.36V
V_{IN_DPM} Threshold
Externally programmed VDPM
4.36V
None
(1) USB3.0 support available. Contact your local TI representative for details.
Copyright © 2014, Texas Instruments Incorporated
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