LT3066 Series
45V V , 500mA Low Noise,
IN
Linear Regulator with Programmable
Current Limit and Active Output Discharge
DescripTion
FeaTures
TheLT®3066seriesaremicropower,lownoise,lowdropout
voltage (LDO) linear regulators that operate over a 1.8V
to 45V input voltage range. The devices supply 500mA of
output current with a typical dropout voltage of 300mV. A
singleexternalcapacitorprovidesprogrammablelownoise
reference performance and output soft-start functionality.
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Input Voltage Range: 1.8V to 45V
Output Current: 500mA
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Active Output Discharge
Dropout Voltage: 300mV
Programmable Precision Current Limit: 10ꢀ
Power Good Flag
Input Filtering for High PSRR
A single external resistor programs the LT3066’s current
limit, accurate to 10% over a wide input voltage and tem-
peraturerange.APWRGDflagindicatesoutputregulation.
Low Noise: 25µV
(10Hz to 100kHz)
RMS
Adjustable Output (V = V
= 600mV)
REF
OUT(MIN)
Output Tolerance: 2% Over Line, Load and Temperature
Stable with Low ESR, Ceramic Output Capacitors
(3.3µF Minimum)
The LT3066 features an NMOS pull-down that discharges
the output if SHDN or IN is driven low.
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Single Capacitor Soft-Starts Reference and Lowers
Output Noise
The LT3066 optimizes stability and transient response
with low ESR ceramic capacitors, requiring a minimum of
3.3µF.Internalprotectioncircuitryincludescurrentlimiting
withfoldback,thermallimiting,reversebatteryprotection,
reverse current protection and reverse output protection.
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Current Limit Foldback Protection
Shutdown Current: <3µA
Reverse Battery and Thermal Limit Protection
12-Lead 4mm × 3mm DFN and 12-lead MSOP Packages
The LT3066 is available in fixed output voltages of 3.3V
and 5V, and as an adjustable device with an output volt-
age range from 0.6V to 19V. The device is offered in the
thermally-enhanced 12-lead 4mm × 3mm DFN and MSOP
packages.
applicaTions
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Battery-Powered Systems
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Automotive Power Supplies
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Industrial Power Supplies
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. U.S. Patents, including 8159278.
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Avionic Power Supplies
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Portable Instruments
Typical applicaTion
Output Discharge vs VOUT
CREF/BYP = 1nF
3.3V Supply with 497mA Precision Current Limit
IN
OUT
IN
5V
OUT
5.0V
3.3V
3.3V
10µF
10µF
SHDN
INFILT
SENSE
500mA
500k
1V/DIV
0.47µF
22nF
2.0V
1.2V
LT3066-3.3
PWRGD
SHDN: 0 TO 2V
I
REF/BYP
MAX
GND
3066 TA01b
604Ω
1ms/DIV
1nF
3066 TA01a
V
C
= V
OUT
+1V
OUT
IN
= 10µF
I
= 10µA
FB-DIVIDER
3066fa
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For more information www.linear.com/LT3066