High-efficiency small buck-boost power supply technology based on TPS63020 - News - Global IC Trade Starts Here.

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The TPS6302x is TI's highly efficient small step-up and step-down power supply solution with input voltages from 1.8V to 5.5V, output currents up to 3A, fixed and adjustable output voltages from 1.2V to 5.5V, and efficiency up to 96%. Automatic conversion of voltage and boost modes, quiescent current less than 50uA, fixed operating frequency 2.4MHz, can be used for all two and three alkaline batteries, NiCd or NiMH or single-cell lithium battery powered devices, ultra-small mobile PC and MID, digital Media Player, DSC and Camera. This article describes the main features of the TPS6302x, block diagram, typical application circuit diagram for adjustable output voltage, and TPS63020EVM evaluation board features, circuit diagrams and bill of materials (BOM).

The 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 3A While using a single-cell Li-Ion or Li-Polymer Battery, and discharge it down to 2.5V or lower. The buck-boost converter is based on a fixed frequency, pulse-width-modulation (PWM) controller using synchronous rectification to The power consumption mode can be disabled, forcing the converter to operate at a fixed switching frequency. The maximum average current in The switch is limited to a typical value of 4A. The output voltage is programmable using an external resistor divider, or is fixed after the chip. The converter can be disabled to minimize battery drain. The device is packaged in a 14-pin QFN PowerPADTM packagemeasuring 3 × 4 mm (DSJ).

Main features of TPS63020:

Up to 96% Efficiency

3A Output Current at 3.3V in Step Down Mode (VIN = 3.6V to 5.5V)

More than 2A Output Current at 3.3V in Boost Mode (VIN > 2.5V)

Automatic Transition Between Step Down and Boost Mode

Dynamic Input Current Limit

Device Quiescent Current less than 50μA

Input Voltage Range: 1.8V to 5.5V

Fixed and Adjustable Output Voltage Options from 1.2V to 5.5V

Power Save Mode for Improved Efficiency at Low Output Power

Forced Fixed Frequency Operation at 2.4MHz and Synchronization Possible

Smart Power Good Output

Load Disconnect During Shutdown

Overtemperature Protection

Overvoltage Protection

Available in a 3 × 4-mm, QFN-14 Package

TPS63020 application:

All Two-Cell and Three-Cell Alkaline, NiCd or NiMH or

Single-Cell Li Battery Powered Products

Ultra Mobile PC's and Mobile Internet Devices

Digital Media Players

DSC's and Camcorders

Figure 1. Functional block diagram of the TPS63020

Figure 2. Functional block diagram of the TPS63021

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