NX5P2553_15 datasheet(17/24 Pages) PHILIPS

17 / 24 page

NX5P2553

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Product data sheet

Rev. 1 — 6 July 2015

17 of 24

NXP Semiconductors

NX5P2553

Precision adjustable current-limited power switch

• Widen the circuit board traces between:

– Power supply and VIN input

– VOUT output and load connection (USB plug)

– Load GND (USB plug) and power supply GND as much as possible. Define a

Kelvin point in the GND line, close to the product and have the device GND

connected to it.

• Use combination of larger and smaller value capacitors with low ESR at the VIN input

and the VOUT output. Ensure that wires to the VIN input, VOUT output and the Kelvin

point are short. Wires behave like coils. Transient currents (e.g. as a result of a short)

may lead to high positive or negative inductance voltages. The carefully routed

high-current path and the short wired capacitors at the VIN input and the VOUT output

keeps these voltages away from the product.

• Load transients affect the supply of the application. Load transients result from the

switch enable and disable process as well as load jumps (application of or removal of

load). The supply might react to load transients with voltage jumps that exceed the

Limiting values. If such voltage jumps are larger, the capacitors at the VIN input and

the VOUT output might not be able to filter them. A strong 6 V Zener diode between

VIN and GND might be considered. Improving the design of the supply is a better

solution.

NX5P2553 Datasheet(PDF) 17 Page - NXP Semiconductors