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Top 5 schools have plenty of admitted students with lower GPAs than 3.4
GPA matters but it isn't everything. Every applicant is judged based on his or her unique profile. Bschool admissions process is not like PHD program admissions process where everything matters on high GPA and GRE scores.
I think GPA should not be a problem for you. One of the reasons they look at your gpa is to determine whether you can handle the academic rigor of the mba program. Your PHD should clear those concerns. You should be more worried about things like why you want an mba now after a phd, what made you take a phd and what else made you change your interests towards mba and stuff like that.
With 5 years of work experience and a PhD, I think your work accomplishments will easily overwhelm the resume and GPA won't even get noticed. And 3.4 is respectable GPA. You should focus on having moving "personal" reasons about why did you do PhD and why does MBA now makes sense for you. The standard explanations that you want to do entrepreneurship/tech-management won't be sufficient to differentiate you from a thousand other electrical engineers out there (and there are quite a few) throwing in their applications. Adcom wants to make sure that you are not just piling up degrees.