Dual 100mA/500mA Low Dropout, Low Noise, Micropower Regulators with Independent Inputs
Low Dropout, Low Noise,
Micropower Regulators with
Independent Inputs U FEATURES DESCRIPTIO ■ The LT ®3028 is a dual, micropower, low noise, low dropout regulator with independent inputs. With an external
0.01µF bypass capacitor, output noise is a low 20µVRMS
over a 10Hz to 100kHz bandwidth. Designed for use in
battery-powered systems, the low 30µA quiescent current
per output makes it an ideal choice. In shutdown, quiescent current drops to less than 0.1µA. Shutdown control
is independent for each output, allowing for flexibility in
power management. The device is capable of operating
over an input voltage range of 1.8V to 20V. Output 1 can
supply 500mA of output current with a dropout voltage of
320mV. The device can supply 100mA of output current
from Output 2 with a dropout voltage of 300mV. Quiescent
current is well controlled in dropout.
The LT3028 regulator is stable with output capacitors as
low as 1µF for the 100mA output and 3.3µF for the 500mA
output. Small ceramic capacitors can be used without the
series resistance required by other regulators.
Internal protection circuitry includes reverse-battery protection, current limiting and thermal limiting protection.
The device is available as an adjustable device with a 1.22V
reference voltage. The LT3028 regulator is available in the …