PM6680A データシートの表示（PDF） - STMicroelectronics

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PM6680A

Dual synchronous step-down controller with adjustable output voltages plus LDO

STMicroelectronics 

Pin settings

PM6680A

2.2

Functions

Table 2. Pin functions

N° Pin

Function

Signal ground. Reference for internal logic circuitry. It must be connected to the

1 SGND1 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.

Enable input for the switching section 2.

• The section 2 is enabled applying a voltage greater than 2.4 V to this pin.

4

EN2 • 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.

Shutdown control input.

• The device switch off if the SHDN voltage is lower than the device off thershold

(Shutdown mode)

5 SHDN • 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.

7

FB2

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.

8

OUT2

Output voltage sense for the switching section 2.This pin must be directly connected

to the output votage of the switching section.

9

BOOT2

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.

Positive current sense input for the switching section 2. This pin must be connected

12 CSENSE2 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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