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L6920

STMicroelectronics
Part Number L6920
Manufacturer STMicroelectronics
Description 1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER
Published Sep 16, 2019
Detailed Description L6920 1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER 1 Features ■ 0.6 TO 5.5V OPERATING INPUT VOLTAGE ■ 1V START UP I...
Datasheet PDF File L6920 PDF File

L6920
L6920

Overview
L6920 1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER 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) ■ 120mΩ 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 Figure 1.
Application Circuit Figure 1.
Package TSSOP8 Table 1.
Order Codes Part Number L6920D L6920DTR Package TSSOP8 Tube Tape & Reel 2 Description The L6920 is a high efficiency step-up controller requiring 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 operating down to 0.
6V.
Internal synchronous rectifier is implemented with a 120mΩ P-channel MOSFET and, in order to improve the efficiency, a variable frequency control is implemented.
VCC 2.
5V L1 LX C2 SHDN LBI REF 78 1 5 L6920D 23 46 OUT FB C3 LBO GND VOUT 3.
3V 500mA C1 February 2005 Rev.
2 1/13 L6920 Table 1.
Pin Description Pin Name Function 1 FB Output voltage selector.
Connect FB to GND for Vout=5V or to OUT for Vout=3.
3V.
Connect FB to an external resistor divider for adjustable output voltage (from 2V to 5.
2V) [see R4 and R5, fig.
7].
2 LBI Battery low voltage detector input.
The internal threshold is set to 1.
23V.
A resistor divider is needed to adjust the desired low battery threshold: VLBI = 1.
23 V ⋅ ⎛ ⎝ 1 + RR-----12--⎠⎞ [see R1 and R2, fig.
7] 3 LBO Battery low voltage detector output.
If the voltage at the LBI pin drops below the internal threshold typ.
1.
23V, LBO goes low.
The LBO is an open drain output and so a pull-up resistor (about 200KΩ) has to be added for correct output setting [see R3, fig.
7].
4 REF 1.
23V reference voltage.
Bypass this output to ...


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