TPS61220, TPS61221, TPS61222

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SLVS776B – JANUARY 2009 – REVISED NOVEMBER 2014

12 Power Supply Recommendations

12.1 Typical Power Sources

The high conversion efficiency of this device encourages the use of a wide range of battery types. Photovoltaic

cells and large capacitors ('supercapacitors') may also serve as power sources within the limits specified in

Recommended Operating Conditions.

12.2 Input Voltage Effects On Output Current and Efficiency

The TPS6122x devices have a wide input-voltage range, and deliver enough current to be applicable to many

portable applications. However, at lower extremes of input voltage, less output current is available, and efficiency

is somewhat less. Figure 1 - Figure 11 show the tradeoffs between input voltage, output current capacity and

conversion efficiency, and allow the designer to plan how far to discharge a battery array before system

shutdown occurs.

12.3 Behavior While Disabled

When the device is disabled, the output voltage follows the power-source voltage as shown in Figure 12.

12.4 Startup

See the description of the Startup sequence for more information.

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Product Folder Links: TPS61220 TPS61221 TPS61222