LT1761 Series
100mA, Low Noise,
LDO Micropower
Regulators in TSOT-23
FEATURES
DESCRIPTION
The LT®1761 series are micropower, low noise, low
dropout regulators. With an external 0.01μF bypass
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Low Noise: 20μV
(10Hz to 100kHz)
RMS
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Low Quiescent Current: 20μA
Wide Input Voltage Range: 1.8V to 20V
Output Current: 100mA
Very Low Shutdown Current: <0.1μA
Low Dropout Voltage: 300mV at 100mA
Fixed Output Voltages: 1.2V, 1.5V, 1.8V, 2V, 2.5V,
2.8V, 3V, 3.3V, 5V
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capacitor, output noise drops to 20μV
over a 10Hz to
RMS
100kHz bandwidth. Designed for use in battery-powered
systems, the low 20μA quiescent current makes them an
ideal choice. In shutdown, quiescent current drops to less
than 0.1μA. The devices are capable of operating over an
input voltage from 1.8V to 20V, and can supply 100mA of
outputcurrentwithadropoutvoltageof300mV.Quiescent
current is well controlled, not rising in dropout as it does
with many other regulators.
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Adjustable Output from 1.22V to 20V
Stable with 1μF Output Capacitor
Stable with Aluminum, Tantalum or
Ceramic Capacitors
TheLT1761regulatorsarestablewithoutputcapacitorsas
low as 1μF. Small ceramic capacitors can be used without
the series resistance required by other regulators.
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Reverse-Battery Protected
No Reverse Current
No Protection Diodes Needed
Internal protection circuitry includes reverse battery
protection, current limiting, thermal limiting and reverse
current protection. The device is available in fixed output
voltages of 1.2V, 1.5V, 1.8V, 2V, 2.5V, 2.8V, 3V, 3.3V and
5V, and as an adjustable device with a 1.22V reference
voltage. The LT1761 regulators are available in the 5-lead
TSOT-23 package.
Overcurrent and Overtemperature Protected
Available in Tiny 5-Lead TSOT-23 Package
APPLICATIONS
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Cellular Phones
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Pagers
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Battery-Powered Systems
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
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Frequency Synthesizers
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Wireless Modems
TYPICAL APPLICATION
10Hz to 100kHz Output Noise
5V Low Noise Regulator
5V AT100mA
20μV NOISE
10μF
IN
OUT
BYP
V
RMS
IN
+
V
OUT
5.4V TO
20V
1μF
0.01μF
LT1761-5
20μV
RMS
100μV/DIV
SHDN
GND
1761 TA01
1761 TA01b
1761sff
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