PM6680ATR STMicroelectronics, PM6680ATR Datasheet - Page 6

• Manufacturer Part Number: PM6680ATR
• Description: IC CTRLR DUAL STEP DOWN 32VFQFPN
• Manufacturer: STMicroelectronics

Specifications of PM6680ATR

• Applications: Controller, Embedded Computer System
• Voltage - Input: 6 ~ 36 V
• Number Of Outputs: 2
• Voltage - Output: 0.9 ~ 5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 32-VFQFN, 32-VFQFPN
• For Use With: 497-6379 - BOARD EVALUATION FOR PM6680A497-6378 - BOARD EVALUATION FOR PM6680497-6425 - BOARD EVAL BASED ON PM6680A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6896-2; PM6680ATR

Pin settings
2.2
6/48
Functions
Table 2.
N°
10
11
12 CSENSE2
13
14
15
16
1
2
3
4
5
6
7
8
9
PHASE2
HGATE2
LGATE2
LGATE1
SGND1
COMP2
SGND2
BOOT2
PGND
SHDN
OUT2
FSEL
EN2
FB2
Pin
NC
Pin functions
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.
DC voltage error compensation pin for the switching section 2
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.
• 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)
• 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).
Not connected.
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.
Output voltage sense for the switching section 2.This pin must be directly connected
to the output votage of the switching section.
Bootstrap capacitor connection for the switching section 2. It supplies the high-side
gate driver.
High-side gate driver ouput for section 2. This is the floating gate driver output.
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
through a resistor to the drain of the synchronous rectifier (R
a positive current limit threshold for the power supply controller.
Low-side gate driver output for the section 2.
Power ground. This pin must be connected to the power ground plan of the power
supply.
Low-side gate driver output for the section 1.
Signal ground for analog circuitry. It must be connected to the signal ground plan of
the power supply.
Function
DSON
sensing) to obtain
PM6680A