LT1763 Series
500mA, Low Noise, LDO
Micropower Regulators
FEATURES
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DESCRIPTIO
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Low Noise: 20µV
RMS
(10Hz to 100kHz)
Output Current: 500mA
Low Quiescent Current: 30µA
Wide Input Voltage Range: 1.8V to 20V
Low Dropout Voltage: 300mV
Very Low Shutdown Current: < 1
µ
A
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
Reverse Battery Protection
No Reverse Current
Overcurrent and Overtemperature Protected
8-Lead SO Package
APPLICATIO S
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Cellular Phones
Battery-Powered Systems
Noise-Sensitive Instrumentation Systems
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
3.3V Low Noise Regulator
IN
1µF
OUT
SENSE
LT1763-3.3
SHDN
BYP
GND
0.01µF
1763 TA01
400
350
V
IN
3.7V TO
20V
+
3.3V AT 500mA
20µV
RMS
NOISE
10µF
DROPOUT VOLTAGE (mV)
300
250
200
150
100
50
0
0
100
300
400
200
OUTPUT CURRENT (mA)
500
1763 TA02
U
Dropout Voltage
1763fa
U
U
1
LINER [ LINEAR TECHNOLOGY ]
