LT3023
Dual 100mA,
Low Dropout, Low Noise,
Micropower Regulator
U
FEATURES
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 20µVRMS over a 10Hz to 100kHz
bandwidth. Designedforuseinbattery-poweredsystems,
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,allowingforflexibilityinpowermanagement.The
device is capable of operating over an input voltage from
1.8Vto20V, andcansupply100mAofoutputcurrentfrom
each channel with a dropout voltage of 300mV. Quiescent
current is well controlled in dropout.
■
Low Noise: 20µVRMS (10Hz to 100kHz)
■
Low Quiescent Current: 20µA/Channel
■
Wide Input Voltage Range: 1.8V to 20V
■
Output Current: 100mA/Channel
Very Low Shutdown Current: <0.1µA
Low Dropout Voltage: 300mV at 100mA
Adjustable Output from 1.22V to 20V
Stable with 1µF Output Capacitor
Stable with Aluminum, Tantalum or
Ceramic Capacitors
■
■
■
■
■
■
■
■
■
■
Reverse Battery Protected
No Reverse Current
No Protection Diodes Needed
Overcurrent and Overtemperature Protected
Thermally Enhanced 10-Lead MSOP and DFN
Packages
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.
U
APPLICATIO S
■
Cellular Phones
■
Pagers
■
Battery-Powered Systems
■
Frequency Synthesizers
■
, LTC and LT are registered trademarks of Linear Technology Corporation.
Wireless Modems
U
TYPICAL APPLICATIO
3.3V/2.5V Low Noise Regulators
10Hz to 100kHz Output Noise
3.3V AT100mA
IN
OUT1
20µV
NOISE
V
IN
RMS
3.7V TO
20V
1µF
SHDN1
SHDN2
0.01µF
10µF
422k
249k
BYP1
ADJ1
LT3023
V
OUT
100µV/DIV
20µV
RMS
2.5V AT100mA
OUT2
20µV
NOISE
RMS
0.01µF
10µF
261k
249k
BYP2
ADJ2
3023 TA01b
GND
3023 TA01
3023f
1