Datasheet

TPS61220, TPS61221, TPS61222
www.ti.com SLVS776A –JANUARY 2009–REVISED APRIL 2014
11 Power Supply Recommendations
11.1 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.
11.2 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.
11.3 Behavior While Disabled
When the device is disabled, the output voltage follows the power-source voltage as shown in Figure 12.
11.4 Startup
See the description of the Startup sequence for more information.
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