BQ24190_15 Datasheet, PDF (15/52 Pages) Texas Instruments – bq2419x I2C Controlled 4.5-A Single Cell USB/Adapter Charger with Narrow VDC Power Path Management and USB OTG

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bq24190, bq24192, bq24192I
SLUSAW5B – JANUARY 2012 – REVISED DECEMBER 2014
Feature Description (continued)
• If PD is attached to a USB host (SDP), the D– is low. If PD is attached to a charging port (CDP or DCP), the
D– is high
• Turn off V_{DP_SRC} and I_{DM_SINK}
Table 2 shows the input current limit setting after D+/D– detection.
Table 2. bq24190 USB D+/D– Detection
D+/D– DETECTION
0.5 sec timer expired in DCD
(D+/D- floating)
USB host
USB host
Charging port
OTG
—
LOW
HIGH
—
INPUT CURRENT LIMIT
100 mA
100 mA
500 mA
1.5 A
REG08[7:6]
00
01
01
10
9.3.1.3.5 PSEL/OTG Pins Set Input Current Limit in bq24192, bq24192I
The bq24192 and bq24192I has PSEL instead of D+/D–. It directly takes the USB PHY device output to decide
whether the input is USB host or charging port.
Table 3. bq24192, bq24192I Input Current Limit Detection
PSEL
HIGH
HIGH
LOW
OTG
LOW
HIGH
—
INPUT CURRENT LIMIT
100 mA
500 mA
1.5 A (bq24192I)
3 A (bq24192)
REG08[7:6]
01
01
10
9.3.1.3.6 HIZ State wth 100mA USB Host
In battery charging spec, the good battery threshold is the minimum charge level of a battery to power up the
portable device successfully. When the input source is 100-mA USB host, and the battery is above bat-good
threshold (V_BATGD), the device follows battery charging spec and enters high impedance state (HIZ). In HIZ state,
the device is in the lowest quiescent state with REGN LDO and the bias circuits off. The charger device sets
REG00[7] to 1, and the VBUS current during HIZ state will be less than 30 µA. The system is supplied by the
battery.
Once the charger device enters HIZ state in host mode, it stays in HIZ until the host writes REG00[7] = 0. When
the processor host wakes up, it is recommended to first check if the charger is in HIZ state.
In default mode, the charger IC will reset REG00[7] back to 0 when input source is removed. When another
source plugs in, the charger IC will run detection again, and update the input current limit.
9.3.1.3.7 Force Input Current Limit Detection
The host can force the charger device to run input current limit detection by setting REG07[7] = 1. After the
detection is complete, REG07[7] will return to 0 by itself.
9.3.1.4 Converter Power-Up
After the input current limit is set, the converter is enabled and the HSFET and LSFET start switching. If battery
charging is disabled, BATFET turns off. Otherwise, BATFET stays on to charge the battery.
The bq24190, bq24192, bq24192I provides soft-start when ramp up the system rail. When the system rail is
below 2.2 V, the input current limit is forced to 100 mA. After the system rises above 2.2 V, the charger device
sets the input current limit set by the lower value between register and ILIM pin.
As a battery charger, the bq24190, bq24192, bq24192I deploys a 1.5-MHz step-down switching regulator. The
fixed frequency oscillator keeps tight control of the switching frequency under all conditions of input voltage,
battery voltage, charge current and temperature, simplifying output filter design.
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