LT1965 Series
1.1A, Low Noise,
Low Dropout Linear Regulator
Features
Description
Output Current: 1.1A
n Dropout Voltage: 310mV
n Low Noise: 40µV
RMS (10Hz to 100kHz)
n 500µA Quiescent Current (Adjustable Version)
n Wide Input Voltage Range: 1.8V to 20V
n No Protection Diodes Needed
n Controlled Quiescent Current in Dropout
n Adjustable Output from 1.20V to 19.5V
n Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V
n < 1µA Quiescent Current in Shutdown
n Stable with 10µF Output Capacitor
n Stable with Ceramic or Tantalum Capacitors
n Reverse-Battery Protection
n No Reverse Current
n Current Limit with Foldback Protection
n Thermal Limiting
n 5-Lead TO-220, DD-Pak, Thermally Enhanced 8-Lead
MSOP and 8-Lead 3mm × 3mm DFN Packages
The LT®1965 series are low noise, low dropout linear regulators. The devices supply 1.1A of output current with a
310mV typical dropout voltage. Operating quiescent current
is 500µA for the adjustable version, reducing to <1µA in
shutdown. Quiescent current is well controlled; it does not
rise in dropout as with many other regulators. The LT1965
regulators have very low output noise which makes them
ideal for sensitive RF and DSP supply applications.
n
Applications
Output voltage ranges from 1.20V to 19.5V. The LT1965
regulators are stable with output capacitors as low as
10µF. Internal protection circuitry includes reverse-battery
protection, current limiting with foldback, thermal limiting and reverse-current protection. The LT1965 series
are available in fixed output voltages of 1.5V, 1.8V, 2.5V,
3.3V, and as an adjustable device with a 1.20V reference
voltage. The package offerings include the 5-lead TO-220,
5-lead DD-Pak as well as the thermally enhanced 8-lead
MSOP and low profile (0.75mm) 8-lead 3mm × 3mm DFN.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
Logic Power Supplies
Post Regulator for Switching Supplies
n Low Noise Instrumentation
n
n
Typical Application
Dropout Voltage
400
3.3V to 2.5V Regulator
TJ = 25°C
VIN > 3V
TO 20V
+
IN
10µF*
OUT
LT1965-2.5
SHDN
+
2.5V
1.1A
10µF*
SENSE
GND
*CERAMIC OR TANTALUM
1965 TA01
DROPOUT VOLTAGE (mV)
350
300
250
200
150
100
50
0
0
0.2
0.6
0.8
0.4
OUTPUT CURRENT (A)
1
1.2
1965 TA01b
1965fb
For more information www.linear.com/LT1965
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