LT1761 Datasheet, PDF (1/16 Pages) Linear Technology – 100mA, Low Noise, LDO Micropower Regulators in SOT-23

LT1761 Series
100mA, Low Noise,
LDO Micropower
Regulators in SOT-23
FEATURES
s _{Tiny 5-Lead SOT-23 Package}
s _{Low Noise: 20µVRMS (10Hz to 100kHz)}
s _{Low Quiescent Current: 20µA}
s _{Wide Input Voltage Range: 1.8V to 20V}
s _{Output Current: 100mA}
s _{Very Low Shutdown Current: < 0.1µA}
s _{Low Dropout Voltage: 300mV at 100mA}
s _{Fixed Output Voltages: 1.5V, 1.8V, 2V, 2.5V, 2.8V,}
3V, 3.3V, 5V
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}
U
APPLICATIO S
s _{Cellular Phones}
s _Pagers
s _{Battery-Powered Systems}
s _{Frequency Synthesizers}
s _{Wireless Modems}
DESCRIPTIO
The LT^®1761 series are micropower, low noise, low
dropout regulators. 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 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
output current with a dropout voltage of 300mV. Quies-
cent current is well controlled, not rising in dropout as it
does with many other regulators.
The LT1761 regulators are 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 in fixed output
voltages of 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 SOT-23
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
V_IN
5.4V TO
20V
5V Low Noise Regulator
IN
OUT
1µF
LT1761-5
SHDN BYP
GND
+
0.01µF
5V AT100mA
20µV_RMS NOISE
10µF
1761 TA01
10Hz to 100kHz Output Noise
V_OUT
100µV/DIV
20µV_RMS
1761 G48
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