BQ25872 Datasheet, PDF (16/68 Pages) Texas Instruments – Battery Switch Charger

bq25872
SLUSCQ6 – OCTOBER 2016
8.2 Functional Block Diagram
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VBUS
Q1
Q2
VBUS_PD_EN
Internal Charge Pump
VUSB
OVPGATE
OVPSET
+
VUSB_OVP
Internal Power
Supply
External FET
charge pump
SCL
SDA
EN
Digital Core
INT
CHGSTAT
10-Bit ADC
VBAT_ADC
IBAT_ADC
TBUS_ADC
TBAT_ADC
VDROP_ADC
+
+
VBAT_REG
TS_BUS
TS_BAT
+
TS_BUS_FLT
+
TS_BAT_FLT
RCP +
RCP
IBUS +
IBUS_OCP
VOUT-VBUS +
RCP
Protection
+ VBUS
VBUS_OVP
+ VBUS-VOUT
VDROP_OVP
+ VBUS-VOUT
VDROP_ALM
+ VOUT
VOUT_REG
+
+
IBAT_REG
VOUT
GND
BATP
BATN
SRP
SRN
Copyright © 2016, Texas Instruments Incorporated
8.3 Feature Description
8.3.1 Device Power Up
The internal bias circuits of the device are powered from higher of the two voltages among VUSB, VBUS and
VOUT as long as one of the pins is above its respective PRESENT threshold (VUSB_PRESENT, VBUS_PRESENT, or
VOUT_PRESENT). Once either V_VUSB > VUSB_PRESENT, V_VBUS > VBUS_PRESENT, or V_VOUT > VOUT_PRESENT is qualified,
the device is considered to have a valid power supply. However, the device will begin to draw current from VBUS
or VOUT (depending upon which supply is present) once either supply is above its respective UVLO threshold.
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Copyright © 2016, Texas Instruments Incorporated