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Hi, I'm developing a security center with WiFi , GPRS , RF, battery backup and some other peripherals. My pcb is good? Vin = 2.8-5V Vout = 4.2V Iout = 1A Ipk = 2.5A Vin_on = 3.315V Vin_off = 2.8V Thank you very much.
1. please add a 10 or 22uF ceramic capacitor to the VOUT pin. this ceramic capacitor is critical for normal operation of the boost converter, which must be place closed to the IC and routed with strong and short track. refer to the application note "www.ti.com/.../slva773.pdf"
2. the Css can be place close the the IC. so the vias between the SS pin and the Css are unnecessary