參數(shù)資料
型號(hào)： PM6680TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 0.4 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32
封裝： 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, VFQFPN-32
文件頁(yè)數(shù)： 49/49頁(yè)
文件大?。?/td> 2931K
代理商： PM6680TR
PM6680
Pin settings
9/49
3.2
Functions
Table 4.
Pin functions
N°
Pin
Function
1SGND1
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
threshold (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 voltage 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 output 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.
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