TPS6302x Buck-Boost Converter

By Texas Instruments 207

TPS6302x Buck-Boost Converter

Texas Instruments' TPS6302x devices provide a power supply solution for products powered by either a two-cell or three-cell alkaline, NiCd or NiMH battery, or a one-cell Li-ion or Li-polymer battery. Output currents can go as high as 3 A while using a single-cell Li-ion or Li-polymer battery, and discharge it down to 2.5 V or lower. The buck-boost converter is based on a fixed frequency, pulse width modulation (PWM) controller using synchronous rectification to obtain maximum efficiency. At low load currents, the converter enters power save mode to maintain high efficiency over a wide load current range. The power save mode can be disabled, forcing the converter to operate at a fixed switching frequency. The maximum average current in the switches is limited to a typical value of 4 A. The output voltage is programmable using an external resistor divider, or is fixed internally on the chip. The converter can be disabled to minimize battery drain. During shutdown, the load is disconnected from the battery.

The TPS6302x devices operate over a free air temperature range of -40°C to +85°C. The devices are packaged in a 14-pin VSON package measuring 3 mm x 4 mm (DSJ).

Features
  • Input voltage range: 1.8 V to 5.5 V
  • Fixed and adjustable output voltage options from 1.2 V to 5.5 V
  • Up to 96% efficiency
  • 3 A output current at 3.3 V in step-down mode (VIN = 3.6 V to 5.5 V)
  • More than 2 A output current at 3.3 V in boost mode (VIN > 2.5 V)
  • Automatic transition between step-down and boost mode
  • Dynamic input current limit
  • Device quiescent current less than 50 µA
  • Power save mode for improved efficiency at low output power
  • Forced fixed frequency operation at 2.4 MHz and synchronization possible
  • Smart power good output
  • Load disconnect during shutdown
  • Overtemperature protection
  • Overvoltage protection
  • Available in a 3 mm x 4 mm 14-pin VSON package (DSJ)
  • Create a custom design using the TPS6302x with the WEBENCH Power Designer
Applications
  • All two-cell and three-cell alkaline, NiCd or NiMH, or single-cell Li battery powered products
  • Ultra-mobile PCs and mobile internet devices
  • Digital media players
  • Digital still cameras (DSC) and camcorders
  • Mobile phones and smartphones

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