The HT73Lxx are a series of low dropout voltage regulators with an input voltage range from 2.3V to 6.6V. They are available in a range of fixed output voltages from 0.9V to 3.6V. When the CE pin input is low, a fast discharge path pulls the output voltage low via an internal pull-down resistor. An internal overcurrent protection circuit prevents the devices from damage even if their output was shorted to ground. An over-temperature protection circuit ensures the device junction temperature will not exceed a temperature of 150ºC.

Due to the device’s outstanding PSRR and low output noise performance features, they are suitable for use in powering RF applications such as sub-1GHz transceivers. Their ultra-small 4-pin DFN package type with their 0.4mm thickness makes the devices also suitable for space limited applications such as financial/credit cards or smart wearable products.

Features:

• 2.3V to 6.6V operating input voltage
• up to 250mA output current capability
• fixed output voltage range: 0.9V, 1.05V, 1.2V, 1.5V, 1.8V, 2.5V, 2.7V, 3.0V, 3.3V and 3.6V with ±2% accuracy
• ultra low input consumption current: 1.35μA (typical)
• stable with 1μF ceramic output capacitor
• fast output discharge to ground when shutdown
• soft-start function when powered on
• high PSRR: 75dB at 1kHz
• low output noise: 50μVRMS from 10Hz to 100kHz
• over current and over temperature protection features
• enable/disable function

Specification: 

• max. input voltage: 6.6V
• output voltage: 0.9V
• max. output current: 250mA
• current consumption: 1.0μA
• chip enable: yes
• tolerance: ±2%
• protection: soft-start, OCP, OTP
• case: SOT89