LT1965 Series
1.1A, Low Noise,
Low Dropout Linear Regulator
Features Description
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Output Current: 1.1A
The LT 1965 series are low noise, low dropout linear regu-
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Dropout Voltage: 310mV
lators. The devices supply 1.1A of output current with a
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Low Noise: 40V (10Hz to 100kHz)
310mV typical dropout voltage. Operating quiescent current
RMS
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500A Quiescent Current (Adjustable Version)
is 500A for the adjustable version, reducing to <1A in
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Wide Input Voltage Range: 1.8V to 20V
shutdown. Quiescent current is well controlled; it does not
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No Protection Diodes Needed
rise in dropout as with many other regulators. The LT1965
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Controlled Quiescent Current in Dropout
regulators have very low output noise which makes them
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Adjustable Output from 1.20V to 19.5V
ideal for sensitive RF and DSP supply applications.
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Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V
Output voltage ranges from 1.20V to 19.5V. The LT1965
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< 1A Quiescent Current in Shutdown
regulators are stable with output capacitors as low as
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Stable with 10F Output Capacitor
10F. Internal protection circuitry includes reverse-battery
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Stable with Ceramic or Tantalum Capacitors
protection, current limiting with foldback, thermal limit-
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Reverse-Battery Protection
ing and reverse-current protection. The LT1965 series
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No Reverse Current
are available in fixed output voltages of 1.5V, 1.8V, 2.5V,
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Current Limit with Foldback Protection
3.3V, and as an adjustable device with a 1.20V reference
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Thermal Limiting
voltage. The package offerings include the 5-lead TO-220,
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5-Lead TO-220, DD-Pak, Thermally Enhanced 8-Lead
5-lead DD-Pak as well as the thermally enhanced 8-lead
MSOP and 8-Lead 3mm 3mm DFN Packages
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
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ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
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Logic Power Supplies
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Post Regulator for Switching Supplies
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Low Noise Instrumentation
t a
Dropout Voltage
400
3.3V to 2.5V Regulator T = 25C
J
350
300
2.5V
IN OUT
1.1A
+ +
V > 3V
250
IN
10F* 10F*
TO 20V LT1965-2.5
200
SHDN SENSE
150
GND
*CERAMIC OR TANTALUM 100
1965 TA01
50
0
0 0.2 0.4 0.6 0.8 1 1.2
OUTPUT CURRENT (A)
1965 TA01b
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DROPOUT VOLTAGE (mV)
pplication ypical
pplicationsLT1965 Series
a MaxiMMu r (Note 1)
Output Short-Circuit Duration .......................... Indefinite
IN Pin Voltage .........................................................22V
Operating Junction Temperature Range (Notes 3, 5, 13)
OUT Pin Voltage ......................................................22V
E-, I-Grades ....................................... 40C to 125C
Input to Output Differential Voltage (Note 2) ......... 22V
H-Grade ............................................. 40C to 150C
SENSE Pin Voltage ..................................................22V
Storage Temperature Range ..................65C to 150C
ADJ Pin Voltage ........................................................9V
Lead Temperature (Soldering, 10 sec)
SHDN Pin Voltage ...................................................22V
(Only for MSOP, TO-220, DD-Pak Packages) ....300C
p Fc
TOP VIEW
TOP VIEW
OUT 1 8 IN
OUT 1 8 IN
OUT 2 7 IN
OUT 2 7 IN
9 9
SENSE/ADJ* 3 6 SHDN
SENSE/ADJ* 3 6 SHDN
GND 4 5 GND
GND 4 5 GND
MS8E PACKAGE
8-LEAD PLASTIC MSOP
DD PACKAGE
T = 125C, = 60C/W, = 10C/W
JMAX JA JC
8-LEAD (3mm 3mm) PLASTIC DFN
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
T = 150C, = 65C/W, = 3C/W
JMAX JA JC
*PIN 3 = SENSE FOR LT1965-1.5/LT1965-1.8/LT1965-2.5/LT1965-3.3
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
*PIN 3 = ADJ FOR LT1965
*PIN 3 = SENSE FOR LT1965-1.5/LT1965-1.8/LT1965-2.5/LT1965-3.3
*PIN 3 = ADJ FOR LT1965
FRONT VIEW
FRONT VIEW
5 SENSE/ADJ*
5 SENSE/ADJ*
4 OUT
4 OUT
TAB IS
TAB IS
3 GND 3 GND
GND GND
2 IN 2
IN
1 SHDN 1 SHDN
Q PACKAGE T PACKAGE
5-LEAD PLASTIC DD-PAK 5-LEAD PLASTIC TO-220
T = 150C, = 50C/W, = 3C/W
T = 150C, = 30C/W, = 3C/W
JMAX JA JC JMAX JA JC
*PIN 5 = SENSE FOR LT1965-1.5/LT1965-1.8/LT1965-2.5/LT1965-3.3
*PIN 5 = SENSE FOR LT1965-1.5/LT1965-1.8/LT1965-2.5/LT1965-3.3
*PIN 5 = ADJ FOR LT1965
*PIN 5 = ADJ FOR LT1965
Dro Fni M
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1965EDD#PBF LT1965EDD#TRPBF LCXW 8-Lead (3mm 3mm) Plastic DFN 40C to 125C
LT1965IDD#PBF LT1965IDD#TRPBF LCXW 8-Lead (3mm 3mm) Plastic DFN 40C to 125C
LT1965EDD-1.5#PBF LT1965EDD-1.5#TRPBF LDKW 40C to 125C
8-Lead (3mm 3mm) Plastic DFN
LT1965IDD-1.5#PBF LT1965IDD-1.5#TRPBF LDKW 8-Lead (3mm 3mm) Plastic DFN 40C to 125C
LT1965EDD-1.8#PBF LT1965EDD-1.8#TRPBF LDKY 8-Lead (3mm 3mm) Plastic DFN 40C to 125C
LT1965IDD-1.8#PBF LT1965IDD-1.8#TRPBF LDKY 8-Lead (3mm 3mm) Plastic DFN 40C to 125C
LT1965EDD-2.5#PBF LT1965EDD-2.5#TRPBF LDMB 8-Lead (3mm 3mm) Plastic DFN 40C to 125C
LT1965IDD-2.5#PBF LT1965IDD-2.5#TRPBF LDMB 40C to 125C
8-Lead (3mm 3mm) Plastic DFN
LT1965EDD-3.3#PBF LT1965EDD-3.3#TRPBF LDMD 8-Lead (3mm 3mm) Plastic DFN 40C to 125C
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For more information www.linear.com/LT1965
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