L6920DB STMicroelectronics, L6920DB Datasheet
L6920DB
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L6920DB Summary of contents
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... Introduction The L6920DB is a high efficiency monolithic step-up switching converter IC especially designed for battery powered applications, thanks to its minimum start-up of 0.8 V, and a minimum operating voltage of 0 requires only three external components to realize the conversion from battery voltage to the selected output voltage. ...
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Contents Contents 1 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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... AN2206 1 Application information Figure 1. L6920DB Example of overall application size Figure 2. Application circuit V =2.5V BATT Figure 3. Pin connections (top view 10µH C1 47µF L6920D V REF 4 C4 100nF 6 GND Application information LBI 2 V OUT 8 C1 47µF ___ LBO _____ SHDN V =3.3V OUT 3/11 ...
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Application information 1.1 Output voltage selection The output voltage must be selected by configuring the FB pin. Three choices are available: ● fixed 3.3 V ● fixed 5 V ● adjustable output set via an external resistor divider. R4 and ...
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... Panasonic 1.5 Switching frequency The control loop of the L6920DB is based on a Minimum OFF-time and a Maximum ON-time (see datasheet). This means that the switching frequency is not fixed, but changes in order to keep the output voltage regulated. The maximum reachable value is approximately 1MHz. The frequency value depends on the inductor value, input and output voltage, and the load. ...
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Application information If a Low battery voltage detection than 1. required possible using a resistor divider between V In this case the relationship is the following: Equation 2 In order to keep the efficiency high, the ...
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... Manufacturer N.C N.C N.C PANASONIC F 47 µ EEFCDJ470R PANASONIC F 47 µ EEFCDJ470R F 1 µ nF 100 L6920DB PANASONIC H 10 µ ELL6RH100M Position 1-2 Device enabled 2-3 Device disabled None Adjustable using R4 and R5 (not mounted) 1-2 3.3 V output voltage 2 output voltage Application information Description Pull-up resistor ...
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Application information Figure 6. Demoboard layout (top view) Figure 7. Demoboard layout (bottom view) 8/11 AN2206 ...
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AN2206 2 Typical performance Figure 8. Efficiency vs. output current at Vout = 3.3 V Figure 9. Efficiency vs. output current at Vout = 5 V Figure 10. Start-up voltage vs. output current at Vout = 5 V VStart up ...
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Revision history Figure 11. Start-up voltage vs. output current at Vout = 3 Revision history Table 6. Revision history Date 05-Dec-2005 09-Feb-2006 05-Oct-2006 26-Mar-2007 10/11 VStart up vs. output current 1600 V out=3.3V 1500 1400 1300 1200 1100 ...
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... AN2206 Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...