LT1962 Datasheet, PDF (1/16 Pages) Linear Technology – 300mA, Low Noise, Micropower LDO Regulators

LT1962 Series
300mA, Low Noise,
Micropower
LDO Regulators
FEATURES
s _{Low Noise: 20µVRMS (10Hz to 100kHz)}
s _{Output Current: 300mA}
s _{Low Quiescent Current: 30µA}
s _{Wide Input Voltage Range: 1.8V to 20V}
s _{Low Dropout Voltage: 270mV}
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 MSOP Package}
U
APPLICATIO S
s _{Cellular Phones}
s _{Battery-Powered Systems}
s _{Noise-Sensitive Instrumentation Systems}
DESCRIPTIO
The LT^®1962 series are micropower, low noise, low
dropout regulators. The devices are capable of supplying
300mA of output current with a dropout voltage of 270mV.
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 LT1962 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 LT1962 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 cur-
rent 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 LT1962 regu-
lators are available in the 8-lead MSOP 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
LT1962-3.3
SHDN BYP
+
0.01µF
3.3V AT 300mA
20µV_RMS NOISE
10µF
GND
1962 TA01
400
350
300
250
200
150
100
50
0
0
Dropout Voltage
50 100 150 200 250 300
LOAD CURRENT (mA)
1962 TA02
1