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L293D Motor Runs at low Voltage

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gauravkothari23

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Hi all,
I need a small help regarding L293D.
I am making a small project using L293D. Bo motor which hardly consumes 60ma at 5v.
i am powering my L293D using a step up circuit 3.7V to 5V from 3.7v li-ion battery.
output current from step up circuit is 200ma which is not a issue.
my problem is the motor voltage pin no 8 shows me 5.12v. when i drive my motor the voltage accross shows me only 3.00v... due to which the motor drives very slow.
can anybody please help why this happen....
Circuit diagram attahced...
 

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Battery - pin, Steup Circuit - pin, L293D GND pin and 8052 GND pin all should be connected to same GND.
 

Battery - pin, Steup Circuit - pin, L293D GND pin and 8052 GND pin all should be connected to same GND.

Thanks....
I have even checked that....
ground pins of all the components.... battery, stepup circuit, L293D, 89S52, are connected to same ground.... but then too i have having the same problem....
 

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