Datasheet LT1962 (Analog Devices)

LT1962 Series 300mA, Low Noise, Micropower LDO Regulators
FeaTures DescripTion
n
Low Noise: 20µVRMS (10Hz to 100kHz)
The LT®1962 series are micropower, low noise, low dropout n
Output Current: 300mA
regulators. The devices are capable of supplying 300mA n
Low Quiescent Current: 30µA
of output current with a dropout voltage of 270mV. De- n
Wide Input Voltage Range: 1.8V to 20V
signed for use in battery-powered systems, the low 30µA n
Low Dropout Voltage: 270mV
quiescent current makes them an ideal choice. Quiescent n
Very Low Shutdown Current: < 1µA
current is well controlled; it does not rise in dropout as it n No Protection Diodes Needed does with many other regulators. n Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3V, 3.3V, 5V A key feature of the LT1962 regulators is low output noise. n Adjustable Output from 1.22V to 20V With the addition of an external 0.01µF bypass capacitor, n Stable with 3.3µF Output Capacitor output noise drops to 20µVRMS over a 10Hz to 100kHz n Stable with Aluminum, Tantalum or bandwidth. The LT1962 regulators are stable with output Ceramic Capacitors capacitors as low as 3.3µF. Small ceramic capacitors can n Reverse Battery Protection be used without the series resistance required by other n No Reverse Current regulators. n Overcurrent and Overtemperature Protected n 8-Lead MSOP Package Internal protection circuitry includes reverse battery protec- tion, current limiting, thermal limiting and reverse current protection. The parts come in fixed output voltages of 1.5V,
applicaTions
1.8V, 2.5V, 3V, 3.3V and 5V, and as an adjustable device n Cellular Phones with a 1.22V reference voltage. The LT1962 regulators are n Battery-Powered Systems available in the 8-lead MSOP package. n Noise-Sensitive Instrumentation Systems L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Typical applicaTion Dropout Voltage
400
3.3V Low Noise Regulator
350 3.3V AT 300mA IN OUT 300 VIN 20µV + RMS NOISE 3.7V TO 1µF SENSE 10µF 250 20V TAGE (mV) LT1962-3.3 0.01µF 200 SHDN BYP 150 GND 1962 TA01 DROPOUT VOL 100 50 0 0 50 100 150 200 250 300 LOAD CURRENT (mA) 1962 TA02 1962fa 1962fb For more information www.linear.com/LT1962 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Applications Information Package Description Revision History Typical Application Related Parts