PM6681A(2006) Ver la hoja de datos (PDF) - STMicroelectronics
Número de pieza
componentes Descripción
Fabricante
PM6681A Datasheet PDF : 12 Pages
| |||
PM6681A
Pin settings
2.2
Functions
Table 1. Pin functions
N°
Pin
Function
Signal ground. Reference for internal logic circuitry. It must be connected to
1
SGND1
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
Frequency selection pin. It provides a selectable switching frequency,
3
FSEL
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 2.4V to this pin.
4
EN2
– The section 2 is disabled applying a voltage lower than 0.8V.
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).
Feedback input for the switching section 2 This pin is connected to a
6
FB2
resistive voltage-divider from OUT2 to PGND to adjust the output voltage
from 0.9V to 3.3V.
7
LDO
Adjustable internal regulator output. It can be set from 0.9V to 3.3V. LDO pin
can provide a 100mA peak current.
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
12 CSENSE2 connected through a resistor to the drain of the synchronous rectifier 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.
5/12
Share Link: 