LT3023_15 Datasheet, PDF (1/16 Pages) Linear Technology – Dual 100mA, Low Dropout, Low Noise, Micropower Regulator

FEATURES
n _{Low Noise: 20μVRMS (10Hz to 100kHz)}
n _{Low Quiescent Current: 20μA/Channel}
n _{Wide Input Voltage Range: 1.8V to 20V}
n _{Output Current: 100mA/Channel}
n _{Very Low Shutdown Current: <0.1μA}
n _{Low Dropout Voltage: 300mV at 100mA}
n _{Adjustable Output from 1.22V to 20V}
n _{Stable with 1μF Output Capacitor}
n _{Stable with Aluminum, Tantalum or}
Ceramic Capacitors
n _{Reverse Battery Protected}
n _{No Reverse Current}
n _{No Protection Diodes Needed}
n _{Overcurrent and Overtemperature Protected}
n _{Thermally Enhanced 10-Lead MSOP and DFN}
Packages
APPLICATIONS
n _{Cellular Phones}
n _Pagers
n _{Battery-Powered Systems}
n _{Frequency Synthesizers}
n _{Wireless Modems}
LT3023
Dual 100mA,
Low Dropout, Low Noise,
Micropower Regulator
DESCRIPTION
The LT^®3023 is a dual, micropower, low noise, low drop-
out regulator. With an external 0.01μF bypass capacitor,
output noise drops to 20μV_RMS over a 10Hz to 100kHz
bandwidth. Designed for use in battery-powered systems,
the low 20μA quiescent current per channel makes it an
ideal choice. In shutdown, quiescent current drops to less
than 0.1μA. Shutdown control is independent for each
channel, allowing for flexibility in power management. The
device is capable of operating over an input voltage from
1.8V to 20V, and can supply 100mA of output current from
each channel with a dropout voltage of 300mV. Quiescent
current is well controlled in dropout.
The LT3023 regulator is stable with output capacitors as
low as 1μF. Small ceramic capacitors can be used without
the series resistance required by other regulators.
Internal protection circuitry includes reverse battery
protection, current limiting, thermal limiting and reverse
current protection. The device is available as an adjust-
able device with a 1.22V reference voltage. The LT3023
regulator is available in the thermally enhanced 10-lead
MSOP and DFN packages.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
3.3V/2.5V Low Noise Regulators
V_IN
3.7V TO
20V
IN
OUT1
1μF
SHDN1
SHDN2 BYP1
ADJ1
LT3023
OUT2
BYP2
ADJ2
GND
0.01μF
422k
249k
0.01μF _261k
249k
3.3V AT100mA
20μV_RMS NOISE
10μF
2.5V AT100mA
20μV_RMS NOISE
10μF
3023 TA01
10Hz to 100kHz Output Noise
V_OUT
100μV/DIV
20μV_RMS
3023 TA01b
3023fa
1