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L6920 Datasheet(PDF) 1 Page - STMicroelectronics |
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L6920 Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 13 page 1/13 L6920 February 2005 1 Features ■ 0.6 TO 5.5V OPERATING INPUT VOLTAGE ■ 1V START UP INPUT VOLTAGE ■ INTERNAL SYNCHRONOUS RECTIFIER ■ ZERO SHUT DOWN CURRENT ■ 3.3V AND 5V FIXED OR ADJUSTABLE OUTPUT VOLTAGE (2V UP TO 5.2V) ■ 120m Ω INTERNAL ACTIVE SWITCH ■ LOW BATTERY VOLTAGE DETECTION ■ REVERSE BATTERY PROTECTION 1.1 Applications ■ ONE TO THREE CELL BATTERY DEVICES ■ PDA AND HAND HELD INSTRUMENTS ■ CELLULAR PHONES - DIGITAL CORDLESS PHONE ■ PAGERS ■ GPS ■ DIGITAL CAMERAS 2 Description The L6920 is a high efficiency step-up controller re- quiring only three external components to realize the conversion from the battery voltage to the selected output voltage. The start up is guaranteed at 1V and the device is op- erating down to 0.6V. Internal synchronous rectifier is implemented with a 120m Ω P-channel MOSFET and, in order to improve the efficiency, a variable frequency control is imple- mented. 1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER Figure 1. Application Circuit L1 LX 8 OUT 1 FB 3 6 LBO GND SHDN 7 5 LBI 2 REF 4 VCC VOUT 2.5V 3.3V 500mA L6920D C2 C3 C1 Figure 1. Package Table 1. Order Codes Part Number Package L6920D TSSOP8 Tube L6920DTR Tape & Reel TSSOP8 Rev. 2 |
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