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LM76003: LM76003 quiescent current is too big in light load mode

Eric Lo72350
Intellectual 915 points
Part Number: LM76003

Hi

Customer feedback the quiescent current is too big in light load mode.

 Vin: 12V, current:17mA

Vout: 5V, loading is 5V/4mA

Switching frequency is 2,1MHz

As we can see from below curve, the efficiency is around 85% in 12Vin/5Vout/4mA condition.

5Vout*4mA=0.002W/85%=0.023W_pin/12Vin=0.0019A (1.9mA) but customer get 17mA on Vin.

so that is make sense?