SNVSBW0B October 2022 – August 2024 LM64440-Q1 , LM64460-Q1
PRODUCTION DATA
The converter is designed to have very low input supply current when regulating at light loads. This is achieved by powering much of the internal circuits from the output. The BIAS pin is the input to the LDO that powers the majority of the control circuits. By connecting BIAS to the regulator output, a small amount of current is drawn from the output. This current is reduced at the input by the ratio of VOUT / VIN. Equation 3 defines the current consumed by the operating (switching) buck converter at no load:
where