特点
Very Low Dropout:
90mV at 150mA
30mV at 50mA (LTC1844-3.3)
Wide Input Voltage Range: 1.6V to 6.5V
Low 35μA Supply Current, Even in Dropout
Low Noise: 60μV
RMS
(10Hz to 100kHz)
±1.75% Voltage Accuracy Over Temperature, Voltage and Current Ranges
Fast Transient Response
10nA Supply Current in Shutdown
Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 2.8V, 3.3V
Adjustable Output Voltage: 1.25V to 6V
Output Current Limit
Reverse-Battery and Reverse-Current Protection
No Protection Diodes Needed
Stable with 1μF Output Capacitor
Stable with Ceramic Capacitors
Short-Circuit and Thermal Overload Protection
Low Profile (1mm) SOT-23 Package
典型应用
典型应用
描述
The LTC?1844 Series are low noise VLDO TM (very low dropout) linear regulators designed for low power/portable applications. These regulators can operate from input voltages as low as 1.6V. Typical output noise is only 30μV RMS and typical dropout for the LTC1844-3.3 is just 90mV at the maximum load current of 150mA, reducing to 30mV at 50mA.
The internal P-channel MOSFET pass transistor requires no base current, allowing the device to draw only 35μA during normal operation, independent of the dropout voltage and load current. The quiescent current falls to a negligible 10nA during shutdown.
Other features include high output voltage accuracy, excellent transient response, stablity with ultralow ESR ceramic capacitors as small as 1μF, reverse-battery and reverse-current protection, short-circuit and thermal overload protection and output current limiting.
The LTC1844 regulators are available in a low profile (1mm) SOT-23 (ThinSOT TM ) package.