NX2139ACMTR MICROSEMI [Microsemi Corporation], NX2139ACMTR Datasheet - Page 17

• Manufacturer Part Number: NX2139ACMTR
• Description: SINGLE CHANNEL MOBILE PWM AND LDO CONTROLLER
• Manufacturer: MICROSEMI [Microsemi Corporation]

nected to the GND plane with multiple vias. One is not
enough. This is very important. The same applies to
the output capacitors and input capacitors.
MOSFET gate as possible. The gate traces should be
wide and short. A place for gate drv resistors is needed
to fine tune noise if needed.
passing capacitor needs to be placed first around the
IC and as close as possible. The capacitor on comp to
GND or comp back to FB needs to be place as close to
the pin as well as resistor divider.
back to the resistor divider should not go through high
frequency signals, should be kept away from the in-
ductor and other noise sources. The resistor divider
must be located as close as possible to the FB pin of
the device.
plane.
and analog ground. These two grounds must be con-
nected together on the PC board layout at a single point.
The goal is to localize the high current path to a sepa-
rate loop that does not interfere with the more sensi-
tive analog control function.
Rev. 2.3
03/19/09
5. Source of the lower MOSFET needs to be con-
6. Hdrv and Ldrv pins should be as close to
7. Vcc capacitor, BST capacitor or any other by-
8. The output sense line which is sensing output
9. All GNDs need to go directly thru via to GND
10. In multilayer PCB, separate power ground
NX2139A
17