TPS65012 Status:ACTIVE

Product Information

Features

• Linear Charger Management for Single Li-Ion or Li-Polymer Cells
• Dual Input Ports for Charging From USB or From Wall Plug, Handles 100-mA / 500-mA USB Requirements
• Charge Current Programmable via External Resistor
• 1-A, 95% Efficient Step-Down Converter for I/O and Peripheral Components (VMAIN)
• 400-mA, 90% Efficient Step-Down Converter for Processor Core (VCORE)
• 2x 200-mA LDOs for I/O and Peripheral Components, LDO Enable via Bus
• Serial Interface Compatible With I²C, Supports 100-kHz, 400-kHz Operation
• LOW_PWR Pin to Lower or Disable Processor Core Supply Voltage in Deep Sleep Mode
• 70-µA Quiescent Current
• 1% Reference Voltage
• Thermal Shutdown Protection
• APPLICATIONS
  • All Single Li-Ion Cell-Operated Products Requiring Multiple Supplies Including:
    • PDA
    • Cellular/Smart Phone
    • Internet Audio Player
    • Digital Still Camera
  • Digital Radio Player
  • Split Supply DSP and µP Solutions

I²C is a trademark of Phillips. PowerPAD is a trademark of Texas Instruments.

Description

The TPS65012 is an integrated power and battery management IC for applications powered by one Li-Ion or Li-Polymer cell and which require multiple power rails. The TPS65012 provides two highly efficient, step-down converters targeted at providing the core voltage and peripheral, I/O rails in a processor-based system. Both step-down converters enter a low power mode at light load for maximum efficiency across the widest possible range of load currents. The LOW_PWR pin allows the core converter to lower its output voltage when the application processor goes into deep sleep. The TPS65012 also integrates two 200-mA LDO voltage regulators, which are enabled via the serial interface. Each LDO operates with an input voltage range between 1.8 V and 6.5 V, allowing them to be supplied from one of the step-down converters or directly from the battery.

The TPS65012 has a highly integrated and flexible Li-Ion linear charger and system power management. It offers integrated USB-port and ac-adapter supply management with autonomous power-source selection, power FET and current sensor, high accuracy current and voltage regulation, charge status, and charge termination.

The TPS65012 charger automatically selects the USB port or the ac adapter as the power source for the system. In the USB configuration, the host can increase the charge current from the default value of maximum 100 mA to 500 mA via the interface. In the ac-adapter configuration, an external resistor sets the maximum value of charge current.

The battery is charged in three phases: conditioning, constant current, and constant voltage. Charge is normally terminated based on minimum current. An internal charge timer provides a safety backup for charge termination. The TPS65012 automatically restarts the charge if the battery voltage falls below an internal threshold. The charger automatically enters sleep mode when both supplies are removed.

The serial interface can be used for dynamic voltage scaling, for collecting information on and controlling the battery charger status, for optionally controlling 2 LED driver outputs, a vibrator driver, masking interrupts, or for disabling/enabling and setting the LDO output voltages. The interface is compatible with the fast/standard mode I²C™ specification allowing transfers at up to 400 kHz.