LT1965 Datasheet, PDF (1/16 Pages) Linear Technology – 1.1A, Low Noise, Low Dropout Linear Regulator

LT1965
1.1A, Low Noise,
Low Dropout Linear Regulator
FEATURES
■ _{Output Current: 1.1A}
■ _{Dropout Voltage: 290mV}
■ _{Low Noise: 40μVRMS (10Hz to 100kHz)}
■ _{500μA Quiescent Current}
■ _{Wide Input Voltage Range: 1.8V to 20V}
■ _{No Protection Diodes Needed}
■ _{Controlled Quiescent Current in Dropout}
■ _{Adjustable Output from 1.20V to 19.5V}
■ _{< 1μA Quiescent Current in Shutdown}
■ _{Stable with 10μF Output Capacitor}
■ _{Stable with Ceramic, Tantalum or Aluminum}
Electrolytic Capacitors
■ _{Reverse Battery Protection}
■ _{No Reverse Current}
■ _{Current Limit with Foldback Protection}
■ _{Thermal Limiting}
■ _{5-Lead TO-220, DD-PAK, Thermally Enhanced 8-Lead}
MSOP and 8-Lead 3mm × 3mm DFN Packages
APPLICATIONS
■ _{Logic Power Supplies}
■ _{Post Regulator for Switching Supplies}
■ _{Low Noise Instrumentation}
DESCRIPTION
The LT^®1965 is a low noise, low dropout linear regulator.
The device supplies 1.1A of output current with a 290mV
typical dropout voltage. Operating quiescent current is
500μA, reducing to <1μA in shutdown. Quiescent current
is well controlled; it does not rise in dropout as with many
other regulators. The LT1965 regulator has very low out-
put noise which makes it ideal for sensitive RF and DSP
supply applications.
Output voltage ranges from 1.20V to 19.5V. The LT1965
regulator is stable with output capacitors as low as 10μF.
Internal protection circuitry includes reverse battery pro-
tection, current limiting with foldback, thermal limiting
and reverse current protection. The LT1965 is available
as an adjustable device with a 1.20V reference voltage.
The package offering includes the 5-lead TO-220, 5-lead
DD-PAK as well as the thermally enhanced 8-lead MSOP
and 8-lead 3mm × 3mm DFN.
, 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
SHDN ADJ
GND
1965 TA01
+
5.11k
1%
2.5V
1.1A
10μF*
4.75k
1%
*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
1965f
1