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L6920D Datasheet(PDF) 2 Page - STMicroelectronics |
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L6920D Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 13 page L6920 2/13 Table 1. Pin Description Figure 2. Pin Connection (Top view) Table 2. Absolute Maximum Ratings Table 3. Thermal Data Pin Name Function 1FB 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: [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 200K Ω) has to be added for correct output setting [see R3, fig. 7]. 4 REF 1.23V reference voltage. Bypass this output to GND with a 100nF capacitor for filtering high frequency noise. No capacitor is required for stability 5 SHDN Shutdown pin. When pin 5 is below 0.2V the device is in shutdown, when pin 5 is above 0.6V the device is operating. 6 GND Ground pin 7 LX Step-up inductor connection 8 OUT Power OUTPUT pin Symbol Parameter Value Unit Vccmax Vcc to GND 6 V LBI, SHDN, FB to GND 6 V Vout max Vout to GND 6 V Symbol Parameter Value Unit Rth j-amb Thermal Resistance Junction to Ambient 250 °C/W Tj Maximum Junction Temperature 150 °C V LBI 1.23V = 1 R1 R2 -------- + ⎝⎠ ⎛⎞ ⋅ FB LBI REF GND LX OUT 1 3 2 4 6 5 7 8 TSSOP8 LBO SHDN |
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