RigidCSP technology for battery designs

New Products | July 24, 2020

By Nick Flaherty

Power Management Materials & processes

Alpha and Omega Semiconductor has developed a rigid chip-scale packaging (CSP) technology that reduces the on-resistance of power devices while increasing the mechanical strength to reduce breakage during assembly and stress during the lifetime of a battery management system.

The RigidCSP package is aimed at applications such as smartphones, tablets, and ultra-thin notebooks. As requirements increase for higher charging current, then ultra-low electrical resistance is needed for improved performance. In standard WL- CSP packages the substrate can be a significant portion of the total resistance on the back-to-back MOSFETs. A thinner substrate will reduce the overall resistance but also will drastically reduce the mechanical strength. This reduction of mechanical strength can lead to more stress during the PCB assembly reflow process, which can lead to die warpage or die crack, which leads to failure in the application.

“Using RigidCSP technology offers performance improvement with high robustness. RigidCSP can be used for high aspect ratio CSP die size, and RigidCSP can enable an overall reduction in warpage/breakage from assembly board manufacturing,” said Peter H. Wilson, Marketing Director of MOSFET product line at AOS.

Part Number

Dimensions

V_DS (V)

V_GS (±V)

R_SS(on) Max

(mOhms) @10V

R_SS(on) Max

(mOhms) @8V

R_SS(on) Max

(mOhms) @4.5V

AOCR32326

6.0mmx2.5mm

2.6

2.9

4.2

AOCR36330

6.22mmx2.5mm

1.4

1.6

2.8

The AOCR32326 and AOCR36330 are immediately available in production quantities with a lead-time of 14-16 weeks. The unit price for 1,000 pieces is $1.44 and $1.50, respectively.

www.aosmd.com