When I use LTC3533, i refer to some information form ADI,such as < PCB Layout Considerations for Non-Isolated Switching
Power Supplies > <999A>(LTC3533's demo),and <power master class>(power class form ADI'wechat in china). but my LTC3533' efficiency is only 35%.
The specific phenomenon:
1.when I first power for my circuit board, it's quiescient current is 140uA! but i setting automatic burst mode. when i touch Rburst\Cburst,the quiescient current is normal:47uA.
2.when input 270mA at 3.66V, my electronic load is 3.5V at 100mA.the efficiency is only 35%! and this monent the SW waveform is so ugly,IC can heat,IC's input voltage is bring down.
my LTC3533 circuit board is two layers,is different with 999A.