LT1965EMS8E Datasheet, PDF (1/20 Pages) Linear Integrated Systems – 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, Tantalum or Aluminum}
Electrolytic 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 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 and LTM are registered trademarks 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, TANTALUM OR
ALUMINUM ELECTROLYTIC
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
1965fa
1