LT1964 Datasheet, PDF (1/12 Pages) Linear Technology – Low Dropout Negative Micropower Regulator in ThinSOT

LT1964
200mA, Low Noise,
Low Dropout Negative
Micropower Regulator in ThinSOT
FEATURES
s _{Low Profile (1mm) ThinSOT}^TM _Package
s _{Low Noise: 30µVRMS (10Hz to 100kHz)}
s _{Low Quiescent Current: 30µA}
s _{Low Dropout Voltage: 340mV}
s _{Output Current: 200mA}
s _{Fixed Output Voltage: –5V}
s _{Adjustable Output from –1.22V to – 20V}
s _{Positive or Negative Shutdown Logic}
s _{3µA Quiescent Current in Shutdown}
s _{Stable with 1µF Output Capacitor}
s _{Stable with Aluminum, Tantalum, or Ceramic}
Capacitors
s _{Thermal Limiting}
U
APPLICATIO S
s _{Battery-Powered Instruments}
s _{Low Noise Regulator for Noise-Sensitive}
Instrumentation
s _{Negative Complement to LT1761 Family of}
Positive LDOs
DESCRIPTIO
The LT^®1964 is a micropower low noise, low dropout
negative regulator. The device is capable of supplying
200mA of output current with a dropout voltage of 340mV.
Low quiescent current (30µA operating and 3µA shut-
down) makes the LT1964 an excellent choice for battery-
powered applications. Quiescent current is well controlled
in dropout.
Other features of the LT1964 include low output noise.
With the addition of an external 0.01µF bypass capacitor,
output noise is reduced to 30µV_RMS over a 10Hz to 100kHz
bandwidth. The LT1964 is capable of operating with small
capacitors and is stable with output capacitors as low as
1µF. Small ceramic capacitors can be used without the
necessary addition of ESR as is common with other
regulators. Internal protection circuitry includes reverse
output protection, current limiting, and thermal limiting.
The device is available with a fixed output voltage of –5V
and as an adjustable device with a –1.22V reference
voltage. The LT1964 regulators are available in a low
profile (1mm) ThinSOT package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
–5V Low Noise Regulator
V_IN
–5.4V
TO –20V
1µF
GND
SHDN BYP
LT1964-5
IN
OUT
10µF
0.01µF
–5V AT 200mA
30µV_RMS NOISE
1964 TA01a
10Hz to 100kHz Output Noise
V_OUT
100µV/DIV
30µV_RMS
1ms/DIV
1964 TA01b
1964f
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