The HT6211 series are highly accurate, low noise, CMOS LDO  Voltage Regulators. Offering low output noise, high ripple rejection  ratio, low dropout and very fast turn-on times, the HT6211 series is ideal for today's cutting edge mobile phone.

Internally the HT6211 includes a reference voltage source, error amplifiers, driver transistors, current limiters and phase compensators. The HT6211's current limiters' foldback circuit also operates as a short protect for the output current limiter and theoutput pin. 

The output voltage is set by laser trimming. Voltages are  selectable in 50mV steps within a range of 0.9V to 5.0V. The HT6211 series is also fully compatible with low ESR ceramic  capacitors, reducing cost and improving output stability. This  high level of output stability is maintained even during frequent load fluctuations, due to the excellent transient response  performance and high PSRR achieved across a broad range of frequencies. 

The CE function allows the output of regulator to be turned off,  resulting in greatly reduced power consumption.  The HT6211 series is available in the SOT-23-5 package.