LT1964
200mA, Low Noise,
Low Dropout Negative
Micropower Regulator in ThinSOT
FEATURES
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DESCRIPTIO
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Low Profile (1mm) ThinSOT
TM
Package
Low Noise: 30µV
RMS
(10Hz to 100kHz)
Low Quiescent Current: 30µA
Low Dropout Voltage: 340mV
Output Current: 200mA
Fixed Output Voltage: –5V
Adjustable Output from –1.22V to – 20V
Positive or Negative Shutdown Logic
3µA Quiescent Current in Shutdown
Stable with 1µF Output Capacitor
Stable with Aluminum, Tantalum, or Ceramic
Capacitors
Thermal Limiting
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.
APPLICATIO S
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Battery-Powered Instruments
Low Noise Regulator for Noise-Sensitive
Instrumentation
Negative Complement to LT1761 Family of
Positive LDOs
TYPICAL APPLICATIO
10Hz to 100kHz Output Noise
–5V Low Noise Regulator
1µF
V
IN
–5.4V
TO –20V
10µF
BYP
0.01µF
V
OUT
100µV/DIV
30µV
RMS
GND
SHDN
LT1964-5
IN
OUT
–5V AT 200mA
30µV
RMS
NOISE
1964 TA01a
U
1ms/DIV
1964 TA01b
U
U
1964f
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LINER [ LINEAR TECHNOLOGY ]
