LT1763 Series
500mA, Low Noise, LDO
Micropower Regulators
FEATURES
DESCRIPTION
TheLT®1763seriesaremicropower,lownoise,lowdropout
regulators.Thedevicesarecapableofsupplying500mAof
output current with a dropout voltage of 300mV. Designed
foruseinbattery-poweredsystems,thelow30μAquiescent
current makes them an ideal choice. Quiescent current is
well controlled; it does not rise in dropout as it does with
many other regulators.
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Low Noise: 20μV
Output Current: 500mA
(10Hz to 100kHz)
RMS
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Low Quiescent Current: 30μA
Wide Input Voltage Range: 1.8V to 20V
Low Dropout Voltage: 300mV
Very Low Shutdown Current: < 1μA
No Protection Diodes Needed
Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3V, 3.3V, 5V
Adjustable Output from 1.22V to 20V
Stable with 3.3μF Output Capacitor
Stable with Aluminum, Tantalum or Ceramic
Capacitors
A key feature of the LT1763 regulators is low output noise.
With the addition of an external 0.01μF bypass capacitor,
output noise drops to 20μV
bandwidth. The LT1763 regulators are stable with output
capacitors as low as 3.3μF. Small ceramic capacitors can
be used without the series resistance required by other
regulators.
over a 10Hz to 100kHz
RMS
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Reverse Battery Protection
No Reverse Current
Overcurrent and Overtemperature Protected
8-Lead SO and 12-Lead (4mm × 3mm) DFN
Packages
Internal protection circuitry includes reverse battery
protection, current limiting, thermal limiting and reverse
currentprotection.Thepartscomeinfixedoutputvoltages
of 1.5V, 1.8V, 2.5V, 3V, 3.3V and 5V, and as an adjustable
device with a 1.22V reference voltage. The LT1763
regulators are available in 8-lead SO and 12-lead, low
profile (4mm × 3mm × 0.75mm) DFN packages.
APPLICATIONS
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Cellular Phones
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Battery-Powered Systems
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Noise-Sensitive Instrumentation Systems
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. Protected by U.S. Patents including 6144250, 6118263.
TYPICAL APPLICATION
Dropout Voltage
400
350
300
250
200
150
100
50
3.3V Low Noise Regulator
3.3V AT 500mA
20μV NOISE
IN
OUT
V
IN
RMS
+
3.7V TO
20V
1μF
SENSE
10μF
LT1763-3.3
0.01μF
SHDN
GND
BYP
1763 TA01
0
0
100
200
300
400
500
OUTPUT CURRENT (mA)
1763 TA02
1763fg
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