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TPS61220 Datasheet(PDF) 13 Page - Texas Instruments

Part # TPS61220
Description  TPS6122x Low Input Voltage, 0.7V Boost Converter With 5.5關A Quiescent Current
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS61220 Datasheet(HTML) 13 Page - Texas Instruments

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background image
L
L
1
VIN
VOUT
FB
C
2
EN
GND
TPS6122x
fixedoutputvoltage
VOUT
VIN
C
1
TPS61220, TPS61221, TPS61222
www.ti.com
SLVS776B – JANUARY 2009 – REVISED NOVEMBER 2014
11 Applications and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
11.1 Application Information
The TPS6122x family devices provide a power-supply solution for products powered by either a single-cell, two-
cell, or three-cell alkaline, NiCd or NiMH, or one-cell Li-Ion or Li-polymer battery. Use the following design
procedure to select component values for the TPS61220 device and the TPS61222 device. Alternatively, use the
SwitcherPro™ tool. This section presents a simplified discussion of the design process.
11.2 Typical Applications
11.2.1 Specific Application, Fixed Output Voltage Supply
Figure 26. Typical Application Circuit For Fixed Output Voltage Option
11.2.1.1 Design Requirements
Single 5 V output at up to 60 mA
Power source, two AA alkaline cells
Greater than 90% conversion efficiency
11.2.1.2 Detailed Design Procedure
11.2.1.2.1
Device Choice
The TPS61222 DC/DC converter is intended for systems powered by anything from a single cell through up to
three Alkaline, NiCd or NiMH cells with a total typical pin voltage between 0.7 V and 5.5 V. They can also be
used in systems powered by one-cell Li-Ion or Li-Polymer batteries with a typical voltage between 2.5 V and 4.2
V. Additionally, any other voltage source with a typical output voltage between 0.7 V and 5.5 V can be used with
the TPS61222.
11.2.1.2.2
Programming The Output Voltage
In the fixed-voltage version used for this example, the output voltage is set by an internal resistor divider. The FB
pin is used to sense the output voltage. To configure the device properly, connect the FB pin directly to VOUT as
shown in Figure 26.
11.2.1.2.3
Inductor Selection
To make sure that the device can operate, a suitable inductor must be connected between pin VIN and pin L.
Inductor values of 4.7
μH show good performance over the whole input and output voltage range.
Choosing other inductance values affects the switching frequency f proportional to 1/L as shown in Equation 1.
Copyright © 2009–2014, Texas Instruments Incorporated
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Product Folder Links: TPS61220 TPS61221 TPS61222


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