LT3023 Datasheet, PDF (1/16 Pages) Linear Technology – Dual 100mA, Low Dropout, Low Noise, Micropower Regulator

LT3023
Dual 100mA,
Low Dropout, Low Noise,
Micropower Regulator
FEATURES
s _{Low Noise: 20µVRMS (10Hz to 100kHz)}
s _{Low Quiescent Current: 20µA/Channel}
s _{Wide Input Voltage Range: 1.8V to 20V}
s _{Output Current: 100mA/Channel}
s _{Very Low Shutdown Current: <0.1µA}
s _{Low Dropout Voltage: 300mV at 100mA}
s _{Adjustable Output from 1.22V to 20V}
s _{Stable with 1µF Output Capacitor}
s _{Stable with Aluminum, Tantalum or}
Ceramic Capacitors
s _{Reverse Battery Protected}
s _{No Reverse Current}
s _{No Protection Diodes Needed}
s _{Overcurrent and Overtemperature Protected}
s _{Thermally Enhanced 10-Lead MSOP and DFN}
Packages
U
APPLICATIO S
s _{Cellular Phones}
s _Pagers
s _{Battery-Powered Systems}
s _{Frequency Synthesizers}
s _{Wireless Modems}
DESCRIPTIO
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 pro-
tection, current limiting, thermal limiting and reverse
current protection. The device is available as an adjustable
device with a 1.22V reference voltage. The LT3023 regu-
lator is available in the thermally enhanced 10-lead MSOP
and DFN packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
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
3023f
1