TPS80032 Datasheet, PDF (64/127 Pages) Texas Instruments – Fully Integrated Power Management With Power Path and Battery Charger

TPS80032
SWCS059I – MARCH 2011 – REVISED NOVEMBER 2014
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• VBUS overvoltage detection
• Battery overvoltage detection
• Battery end-of-charge detection
• Thermal protection
• Watchdogs
The same switches and external components that are used for system supply generation in buck mode
can be used to generate a 5-V USB OTG supply in boost mode. In this mode, the TPS80032 device can
deliver up to 300 mA of total current for USB connector and for LDOUSB.
The VBUS input in the TPS80032 device operates up to 6.3 V; above this, level the system supply
regulator is disabled. The VBUS input tolerates up to 20-V input voltages and down to –0.3-V input
voltages. The negative input voltage protection can be improved with external PMOS transistor and
resistor (shown in Figure 5-6 as optional components). This gives tolerance down to –14 V.
NOTE
The charging source terms are defined as follows (USB Battery Charging Specification, Rev.
1.2)
• Standard Downstream Port (SDP): a downstream port on a device that complies with the
USB 2.0 definition of a host or hub.
• Charging Downstream Port (CDP): a downstream port on a device that complies with the
USB 2.0 definition of a host or a hub, except that it shall support the Charging
Downstream Port features allowing higher charging currents.
• Dedicated Charging Port (DCP): a downstream port on a device that outputs power
through a USB connector, but is not capable of enumerating a downstream device.
• USB Charger: a device with a DCP, such as a wall adapter or car power adapter.
• Accessory Charger Adaptor (ACA): an adaptor which allows a single USB port to be
attached to both a charger and another device at the same time.
• Charging Port: a DCP, CDP or ACA
5.9.1 Charger and System Supply Regulator Controller Operation
The operation of the battery charger and the system supply regulator depends on the platform
configuration. There are two different configurations for hardware:
• Power Path configuration (POP_APPSCH OTP bit is 1); an external PMOS is needed between VSYS
and VBAT.
• Non-Power Path configuration (POP_APPSCH OTP bit is 0); VBAT is used as a system voltage.
In addition, software interaction with battery charging in both configurations depends on the
AUTOCHARGE OTP bit:
• Hardware controlled charging (AUTOCHARGE bit is 1); software interaction is minimized.
• Software controlled charging (AUTOCHARGE bit is 0); software controls the battery charging.
The operation in the four different modes has been described in Section 5.9.1.1 through Section 5.9.1.4.
The flow chart for startup, shutdown, and fallback (Power Control) operates in parallel with a flow chart of
the system supply regulator and battery charging (Charger Control). The safety timer and watchdog
operation is described in Section 5.9.6 and the charging profile and default charging parameters are
described in Section 5.9.3.
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Detailed Description
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