RT8167A datasheet(39/40 Pages) RICHTEK

39 / 40 page

RT8167A

DS8167A-00

January 2012

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Keep the high current paths short, especially at the

ground terminals.

Keep the power traces and load connections short. This

is essential for high efficiency.

When trade-offs in trace lengths must be made, it's

preferable to allow the inductor charging path to be made

longer than the discharging path.

Place the current sense component close to the

controller. ISENxP and ISENxN connections for current

limit and voltage positioning must be made using Kelvin

sense connections to guarantee the current sense

accuracy. The PCB trace from the sense nodes should

be parallel to the controller.

Route high-speed switching nodes away from sensitive

analog areas (COMPx, FBx, ISENxP, ISENxN, etc...)

Special attention should be paid in placing the DCR

current sensing components. The DCR current sensing

capacitor and resistors must be placed close to the

controller.

The capacitor connected to the ISEN1N/ISENAN for noise

decoupling is optional and it should also be placed close

to the ISEN1N/ISENAN pin.

The NTC thermistor should be placed physically close

to the inductor for better DCR thermal compensation.

RT8167A Datasheet(PDF) 39 Page - Richtek Technology Corporation