LT1763 Datasheet, PDF (1/16 Pages) Linear Technology – 500mA, Low Noise, LDO Micropower Regulators

LT1763 Series
500mA, Low Noise, LDO
Micropower Regulators
FEATURES
s _{Low Noise: 20µVRMS (10Hz to 100kHz)}
s _{Output Current: 500mA}
s _{Low Quiescent Current: 30µA}
s _{Wide Input Voltage Range: 1.8V to 20V}
s _{Low Dropout Voltage: 300mV}
s _{Very Low Shutdown Current: < 1µA}
s _{No Protection Diodes Needed}
s _{Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3V, 3.3V, 5V}
s _{Adjustable Output from 1.22V to 20V}
s _{Stable with 3.3µF Output Capacitor}
s _{Stable with Aluminum, Tantalum or}
Ceramic Capacitors
s _{Reverse Battery Protection}
s _{No Reverse Current}
s _{Overcurrent and Overtemperature Protected}
s _{8-Lead SO Package}
U
APPLICATIO S
s _{Cellular Phones}
s _{Battery-Powered Systems}
s _{Noise-Sensitive Instrumentation Systems}
DESCRIPTIO
The LT^®1763 series are micropower, low noise, low
dropout regulators. The devices are capable of supplying
500mA of output current with a dropout voltage of 300mV.
Designed for use in battery-powered systems, the low
30µA quiescent current makes them an ideal choice.
Quiescent current is well controlled; it does not rise in
dropout as it does with many other regulators.
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_RMS over a 10Hz to 100kHz
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.
Internal protection circuitry includes reverse battery pro-
tection, current limiting, thermal limiting and reverse
current protection. The parts come in fixed output volt-
ages 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 the 8-lead SO package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
V_IN
3.7V TO
20V
3.3V Low Noise Regulator
IN
OUT
1µF
SENSE
LT1763-3.3
SHDN BYP
GND
+
0.01µF
3.3V AT 500mA
20µV_RMS NOISE
10µF
1763 TA01
400
350
300
250
200
150
100
50
0
0
Dropout Voltage
100 200 300 400 500
OUTPUT CURRENT (mA)
1763 TA02
1763fa
1