Datasheet LT3027 (Analog Devices)

LT3027 Dual 100mA, Low Dropout, Low Noise, Micropower Regulator with Independent Inputs
U FEATURES DESCRIPTIO
■
Low Noise: 20
µ
VRMS (10Hz to 100kHz)
The LT®3027 is a dual, micropower, low noise, low drop- ■
Low Quiescent Current: 25
µ
A/Channel
out regulator with independent inputs. With an external ■
Independent Inputs
0.01µF bypass capacitor, output noise is a low 20µVRMS ■
Wide Input Voltage Range: 1.8V to 20V
over a 10Hz to 100kHz bandwidth. Designed for use in ■
Output Current: 100mA/Channel
battery-powered systems, the low 25µA quiescent current ■
Very Low Shutdown Current: <0.1
µ
A
per channel makes it an ideal choice. In shutdown, quies- ■
Low Dropout Voltage: 300mV at 100mA
cent current drops to less than 0.1µA. Shutdown control ■ Adjustable Output from 1.22V to 20V is independent for each channel, allowing for flexibility in ■ Stable with 1µF Output Capacitor power management. The device is capable of operating ■ Stable with Aluminum, Tantalum or over an input voltage from 1.8V to 20V, and can supply Ceramic Capacitors 100mA of output current from each channel with a drop- ■ Reverse Battery Protected out voltage of 300mV. Quiescent current is well controlled ■ No Protection Diodes Needed in dropout. ■ Overcurrent and Overtemperature Protected The LT3027 regulator is stable with output capacitors as ■ Tracking/Sequencing Capability low as 1µF. Small ceramic capacitors can be used without ■ Thermally Enhanced 10-Lead MSOP and DFN the series resistance required by other regulators. Packages
U
Internal protection circuitry includes reverse battery pro-
APPLICATIO S
tection, current limiting and thermal limiting protection. The device is available as an adjustable device with a ■ Cellular Phones 1.22V reference voltage. The LT3027 regulator is available ■ Pagers in the thermally enhanced 10-lead MSOP and low profile ■ Battery-Powered Systems (0.75mm) 3mm × 3mm DFN packages. ■ Frequency Synthesizers , LTC and LT are registered trademarks of Linear Technology Corporation. ■ Wireless Modems All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6118263, 6144250. ■ Tracking/Sequencing Power Supplies
U TYPICAL APPLICATIO 3.3V/2.5V Low Noise Regulators 10Hz to 100kHz Output Noise
3.3V AT 100mA IN1 OUT1 VIN1 20µVRMS NOISE 3.7V TO 1µF SHDN1 0.01µF 10µF 20V 422k BYP1 ADJ1 249k VOUT LT3027 20µV 100µV/DIV RMS 2.5V AT 100mA IN2 OUT2 V 20 IN2 µVRMS NOISE 2.9V TO 1µF SHDN2 0.01µF 10µF 261k 20V BYP2 ADJ2 3027 TA01b GND 249k 3027 TA01 3027fa 1