FEATURES
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
Low Profile (1mm) ThinSOT™ and (0.75mm) 8-Pin
3mm
×
3mm DFN Packages
DESCRIPTION
The LT
®
1964 is a micropower low noise, low dropout nega-
tive regulator. The device is capable of supplying 200mA
of output current with a dropout voltage of 340mV. Low
quiescent current (30μA operating and 3μA shutdown)
makes the LT1964 an excellent choice for battery-pow-
ered 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 volt-
age. The LT1964 regulators are available in a low profile
(1mm) ThinSOT and the low profile (0.75mm) 8-pin
(3mm
×
3mm) DFN packages.
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