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L5988 Datasheet(PDF) 4 Page - STMicroelectronics |
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L5988 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 10 page Pin connections and functions L5988 4/10 2 Pin connections and functions Figure 1. Pin connection ( Top view) Table 1. Pin functions No Pin Name Description 2,3,4 VCC Unregulated DC input voltage. 1,16 VOUT Regulator output. 13,14,15 GND Ground. 9 SYNCH It is a Master-Slave pin. Two or more devices can be synchronized by simply connecting the SYNCH pins together. The device operating with the highest FSW will be the Master. The Slave devices will operate with 180° phase shift from the Master. 10 FSW Connecting an external resistor from this pin to GND, the external frequency can be increased up to 1 MHz. Connecting an external resistor from this pin to VREF (1.8V), the switching frequency can be decreased down to 200 KHz. If the pin is left open, the default switching frequency is 400 KHz. The pin voltage is 1.2V. In OVP the pin is pulled up to 3.3V (only in latched mode). 8FB This pin is connected to the error amplifier inverting input. Connect it to the output resistor divider (if used) or directly to Vout. This pin is also used to sense the output voltage in order to manage the over voltage condition. 6COMP This pin is connected to the error amplifier output and is used to compensate the voltage control feedback loop. 5 SS/INH The soft-start time is programmed connecting an external capacitor from this pin and GND. The internal current generator forces a current of 22 µA through the capacitor. When the voltage at this pin is lower than 0.65V the device is disabled. 12 VREF Internally regulated voltage of 1.8V. It is used to provide a voltage reference for the multifunction pin. Filter this pin to ground with at least 1 µF ceramic cap. 7ILIM-ADJ Connecting a resistor between this pin and GND it is possible to increase the over current protection threshold. Connecting a resistor between this pin and VREF it is possible to decrease the over current protection threshold. 11 S/O/U Multifunction pin. Depending on the voltage level at the input, with this pin it is possible: – to enable-disable the sink mode current capability after soft-start; – to enable-disable the latch mode for the OVP; – to set the UVLO threshold for the 3.3V BUS and 12V BUS. (2.4V and 8V respectively); The device continuously checks the analog value present at this pin and sets the function according with the measured voltage. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VOUT VCC VCC VCC SS/INH COMP FB SYNCH FSW OUS VREF GND GND GND VOUT ILIM-ADJ |
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