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LDO marking A9j99 on whatsminer m20 hashboard

A9j99 is a set of low power high voltage regulators implemented in CMOS technology which can provide 150mA output current.
The device allows input voltage as high as 36V. A9j99 is available in adjustable and several fixed output voltages. CMOS technology ensures low dropout voltage and low quiescent current. Although designed primarily as fixed voltage regulators, the device can be used with external components to obtain variable output voltages. A9j99 is available in Green SOT-23-5 packages. It operates over an ambient temperature range of -40℃ to +85℃.