BQ24165_14 Datasheet, PDF (17/38 Pages) Texas Instruments – 2.5A, Dual-Input, Single Cell Switch Mode Li-Ion Battery Charger with Power Path Management

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bq24165
bq24166
bq24167
SLUSAP4B – DECEMBER 2011 – REVISED MARCH 2013
2000 mA
1800 mA
I_OUT
800 mA
0 mA
1500 mA
I_IN ~850 mA
0 mA
1A
I_BAT
0 mA
–200 mA
V_SYS(REG)
V_MINSYS
V_OUT
~3.1 V
DPPM Loop Active
Supplement
Mode
Figure 21. Example DPPM Response (V_Supply = 5 V, V_BAT = 3.1V, 1.5A Input current limit)
If the V_BAT(REG) threshold is ever less than the battery voltage, the battery FET is turned off and the SYS output is
regulated to V_{SYSREG(FETOFF)}. If the battery is ever 5% above the regulation threshold, the battery OVP circuit
shuts the PWM converter off and the battery FET is turned on to discharge the battery to safe operating levels.
The input current limit for the USB input is set by the IUSB1, IUSB2, and IUSB3 inputs. The bq24165/6/7
incorporates all of the necessary input current limits to support USB2.0 and USB3.0 standards as well as 1.5A to
support wall adapters. Driving IUSB1, IUSB2, and IUSB3 all high places the bq24165/6/7 in High Impedance
mode where the buck converter is shutdown regardless if an input is connected to USB or IN. Table 1 shows the
configuration for IUSB1 – IUSB3. When USB100 mode is selected, termination is disabled.
IUSB3
0
0
0
0
1
1
1
1
IUSB2
0
0
1
1
0
0
1
1
Table 1. USB1, USB2 and USB3 Input Table
IUSB1
0
1
0
1
0
1
0
1
Input Current Limit
100 mA
500 mA
1.5 A
High Impedance Mode
150 mA
900 mA
800 mA
High Impedance Mode
V_INDPM Threshold
4.28 V
4.44 V
4.44 V
None
4.28 V
4.44 V
4.44 V
None
The input current limit for IN is programmable using the ILIM input. Connect a resistor from ILIM to GND to set
the maximum input current limit. The programmable range for the IN input current limit is 1000mA to 2.5A. R_ILIM
is calculated using Equation 2:
R_ILIM
=
K _{ILI M}
I_{IN_LIM}
(2)
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