LT1763_15 Datasheet, PDF (1/22 Pages) Linear Technology – 500mA, Low Noise, LDO Micropower Regulators

LT1763 Series
500mA, Low Noise, LDO
Micropower Regulators
Features
n _{Low Noise: 20µVRMS (10Hz to 100kHz)}
n _{Output Current: 500mA}
n _{Low Quiescent Current: 30µA}
n _{Wide Input Voltage Range: 1.8V to 20V}
n _{Low Dropout Voltage: 300mV}
n _{Very Low Shutdown Current: < 1µA}
n _{No Protection Diodes Needed}
n _{Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3V, 3.3V, 5V}
n _{Adjustable Output from 1.22V to 20V}
n _{Stable with 3.3µF Output Capacitor}
n _{Stable with Aluminum, Tantalum or Ceramic}
Capacitors
n _{Reverse Battery Protection}
n _{No Reverse Current}
n _{Overcurrent and Overtemperature Protected}
n _{8-Lead SO and 12-Lead (4mm × 3mm) DFN}
Packages
Applications
n _{Cellular Phones}
n _{Battery-Powered Systems}
n _{Noise-Sensitive Instrumentation Systems}
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 regu-
lators are available in 8-lead SO and 12-lead, low profile
(4mm × 3mm × 0.75mm) DFN packages.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents including 6144250, 6118263.
Typical Application
3.3V Low Noise Regulator
V_IN
3.7V TO
20V
IN
OUT
1µF
SENSE
3.3V AT 500mA
+
20µV_RMS NOISE
10µF
LT1763-3.3
0.01µF
SHDN
BYP
GND
1763 TA01
400
350
300
250
200
150
100
50
0
0
Dropout Voltage
100 200 300 400
OUTPUT CURRENT (mA)
500
1763 TA02
For more information www.linear.com/LT1763
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