LT1763 Series
500mA, Low Noise, LDO
Micropower Regulators
FEATURES
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DESCRIPTION
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
protection, current limiting, thermal limiting and reverse
current protection. The parts come in fixed output voltages
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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All
other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 6144250, 6118263.
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: < 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
Reverse Battery Protection
No Reverse Current
Overcurrent and Overtemperature Protected
8-Lead SO and 12-Lead (4mm
×
3mm) DFN
Packages
APPLICATIONS
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Cellular Phones
Battery-Powered Systems
Noise-Sensitive Instrumentation Systems
TYPICAL APPLICATION
3.3V Low Noise Regulator
DROPOUT VOLTAGE (mV)
3.3V AT 500mA
20μV
RMS
NOISE
10μF
0.01μF
400
350
V
IN
3.7V TO
20V
IN
1μF
OUT
SENSE
LT1763-3.3
SHDN
BYP
GND
1763 TA01
Dropout Voltage
+
300
250
200
150
100
50
0
0
100
300
400
200
OUTPUT CURRENT (mA)
500
1763 TA02
1763fe
1
LINER [ LINEAR TECHNOLOGY ]
