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PM6680A Datasheet(PDF) 6 Page - STMicroelectronics

Part No. PM6680A
Description  Dual synchronous step-down controller with adjustable output voltages plus LDO
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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PM6680A Datasheet(HTML) 6 Page - STMicroelectronics

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Pin settings
PM6680A
6/48
2.2
Functions
Table 2.
Pin functions
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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