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LTC4440 TG not responsing

Hi to all,

I am trying to build a DC/DC step down converter. I used LTC4440 Gate Driver IC for switching a N Channel Power Mosfet as a high side switch. I used 555 Timer Circuit to arrange the PWM as Vpp = 12V to Pwm(in) of the driver IC pin as suggested in the datasheet. The PWM circuit works as expected but my LTC Driver is not responding somehow. I was suspicious of the value of the Bootstrap Capacitor and did a little research to calculate it accurately but no change received in the IC. I share the schematics of the gate driver below. Any help is appreciated. Thanks.

Q1 : NTB60N06 60V, 60A Power Mosfet (D2Pak)

D1 : 1N4007

C3: 16V - 0.22uF Ceramic Cap

R1: 2512, 1.5W, %1, 15R