LT1965_15 Datasheet, PDF (1/22 Pages) Linear Technology – 1.1A, Low Noise, Low Dropout Linear Regulator

LT1965 Series
1.1A, Low Noise,
Low Dropout Linear Regulator
Features
n _{Output Current: 1.1A}
n _{Dropout Voltage: 310mV}
n _{Low Noise: 40µVRMS (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
Applications
n _{Logic Power Supplies}
n _{Post Regulator for Switching Supplies}
n _{Low Noise Instrumentation}
Description
The LT^®1965 series are low noise, low dropout linear regu-
lators. 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.
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 limit-
ing 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.
Typical Application
3.3V to 2.5V Regulator
V_IN > 3V ⁺
TO 20V
10µF*
IN
OUT
LT1965-2.5
SHDN SENSE
GND
1965 TA01
2.5V
+
1.1A
10µF*
*CERAMIC OR TANTALUM
Dropout Voltage
400
T_J = 25°C
350
300
250
200
150
100
50
0
0 0.2 0.4 0.6 0.8 1 1.2
OUTPUT CURRENT (A)
1965 TA01b
For more information www.linear.com/LT1965
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