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One-Chip Power Management Solution for Cellular Phones Increases Life of Batteries, Shortens Time-to-Market, Saves Space

Designers of cellular telephones will be able to quickly develop smaller and more reliable handsets with a new device from Texas Instruments. Complete baseband power management is now available on a single chip. TI's TPS9111 shortens design cycles because it eliminates the need to develop a power management system using discrete components.

The TPS9111 provides efficient power management by integrating three programmable 100 milli-Amp low-dropout voltage regulators with 100 milli-Volt dropouts. Another power-saving feature of the TPS9111 is a shut-down mode which reduces the device's power consumption to one micro-Amp when the handset is not being used. The device also includes a microprocessor reset generator and a charge pump capable of inverting or doubling a voltage. The TPS9111 is inherently more reliable than a discrete solution, and it requires less board space.

Key Technical Features

• Low Power Consumption: Three programmable low-dropout (LDO) voltage regulators with 100 milli-Volt dropout points and capable of outputing 100 milli-Amps of continuous current. LDOs are implemented with one-ohm PMOS series-pass transistors. Output is programmable to 3.3 V or 3 V. The device is fabricated using TI's advanced low-power LinBiCMOS process.

• Orderly Power-Up: During power-up, the device's power supervisor holds the system's microprocessor in rest condition until required operating power threshold is reached. Following this, TPS9111 holds microprocessor in reset for additional 250 milli-seconds to assure proper power level is available.
  

• Versatile Charge Pump: 10 milli-Amp charge pump driver capable of inverting or doubling the voltage. Inverted voltage can be used to power a liquid-crystal display (LCD) or to provide gate bias to a GaAs power amplifier. Doubling voltage can be used for flash memory programming or powering the subscriber identity module in European applications.
  

• Saving Battery Life: Shut-down mode for entire chip consumes less than one micro-Amp when cellular phone is not in use. Separate enable pins for two of three integrated LDOs and charge pump allow selective shut-down modes to conserve battery power.
  

• Other Features:
  • On/off control logic for use with pushbutton switch on handset.
  • 1.185 bandgap Volt reference.
  • Undervoltage lock-out feature provides for an orderly turn-on process by preventing the operation of the TPS9111 until the input voltage exceeds a threshold level.
  • Over-temperature protection prevents heat damage to the IC by automatically shutting down the TPS9111 when temperatures exceed 160 degrees C.
  • Packaged in a 28-pin thin shrink small outline package (TSSOP).
  • Operating temperature range of -40 to 85 degrees C.