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PM6680A Datasheet(PDF) 6 Page - STMicroelectronics |
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PM6680A Datasheet(HTML) 6 Page - STMicroelectronics |
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6 / 48 page 
Pin settings PM6680A 6/48 2.2 Functions Table 2. Pin functions N° Pin Function 1 SGND1 Signal ground. Reference for internal logic circuitry. It must be connected to the signal ground plan of the power supply. The signal ground plan and the power ground plan must be connected together in one point near the PGND pin. 2 COMP2 DC voltage error compensation pin for the switching section 2 3 FSEL Frequency selection pin. It provides a selectable switching frequency, allowing three different values of switching frequencies for the switching sections. 4EN2 Enable input for the switching section 2. • The section 2 is enabled applying a voltage greater than 2.4 V to this pin. • The section 2 is disabled applying a voltage lower than 0.8 V. When the section is disabled the High Side gate driver goes low and Low Side gate driver goes high. If both EN1 and EN2 pins are low and SHDN pin is high the device enters in standby mode. 5 SHDN Shutdown control input. • The device switch off if the SHDN voltage is lower than the device off thershold (Shutdown mode) • The device switch on if the SHDN voltage is greater than the device on threshold. The SHDN pin can be connected to the battery through a voltage divider to program an undervoltage lockout. In shutdown mode, the gate drivers of the two switching sections are in high impedance (high-Z). 6 NC Not connected. 7FB2 Feedback input for the switching section 2 This pin is connected to a resistive voltage-divider from OUT2 to PGND to adjust the output voltage from 0.9 V to 3.3 V. 8OUT2 Output voltage sense for the switching section 2.This pin must be directly connected to the output votage of the switching section. 9BOOT2 Bootstrap capacitor connection for the switching section 2. It supplies the high-side gate driver. 10 HGATE2 High-side gate driver ouput for section 2. This is the floating gate driver output. 11 PHASE2 Switch node connection and return path for the high side driver for the section 2.It is also used as negative current sense input. 12 CSENSE2 Positive current sense input for the switching section 2. This pin must be connected through a resistor to the drain of the synchronous rectifier (RDSON sensing) to obtain a positive current limit threshold for the power supply controller. 13 LGATE2 Low-side gate driver output for the section 2. 14 PGND Power ground. This pin must be connected to the power ground plan of the power supply. 15 LGATE1 Low-side gate driver output for the section 1. 16 SGND2 Signal ground for analog circuitry. It must be connected to the signal ground plan of the power supply. |
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