LT1762_15 Datasheet, PDF (1/16 Pages) Linear Technology – 150mA, Low Noise, LDO Micropower Regulators

LT1762 Series
150mA, Low Noise, LDO
Micropower Regulators
FEATURES
■ _{Low Noise: 20µVRMS (10Hz to 100kHz)}
■ _{Low Quiescent Current: 25µA}
■ _{Wide Input Voltage Range: 1.8V to 20V}
■ _{Output Current: 150mA}
■ _{Very Low Shutdown Current: < 1µA}
■ _{Low Dropout Voltage: 270mV}
■ _{No Protection Diodes Needed}
■ _{Fixed Output Voltages: 2.5V, 3V, 3.3V, 5V}
■ _{Adjustable Output from 1.22V to 20V}
■ _{Stable with 2.2µF Output Capacitor}
■ _{Stable with Aluminum, Tantalum or}
Ceramic Capacitors
■ _{Reverse Battery Protection}
■ _{No Reverse Current}
■ _{Overcurrent and Overtemperature Protected}
■ _{8-Lead MSOP Package}
U
APPLICATIO S
■ _{Cellular Phones}
■ _{Battery-Powered Systems}
■ _{Frequency Synthesizers}
■ _{Noise-Sensitive Instrumentation Systems}
DESCRIPTIO
The LT^®1762 series are micropower, low noise, low
dropout regulators. The devices are capable of supplying
150mA of output current with a dropout voltage of 270mV.
Designed for use in battery-powered systems, the low
25µA 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 LT1762 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 LT1762 regulators are stable with output
capacitors as low as 2.2µF. 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 2.5V, 3V, 3.3V and 5V, and as an adjustable device
with a 1.22V reference voltage. The LT1762 regulators are
available in the 8-lead MSOP package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
3.3V Low Noise Regulator
V_IN
3.7V TO
20V
IN
OUT
1µF
SENSE
LT1762-3.3
SHDN BYP
GND
+
0.01µF
3.3V AT 150mA
20µV_RMS NOISE
10µF
1762 TA01
Dropout Voltage
400
350
300
250
200
150
100
50
0
0 20 40 60 80 100 120 140 160
OUTPUT CURRENT (mA)
1762 TA02
1762fa
1