LT1963A Series
1.5A, Low Noise,
Fast Transient Response
LDO Regulators
Fea T Descrip T
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Optimized for Fast Transient Response
The LT 1963A series are low dropout regulators optimized
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Output Current: 1.5A
for fast transient response. The devices are capable of
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Dropout Voltage: 340mV
supplying 1.5A of output current with a dropout voltage of
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Low Noise: 40V (10Hz to 100kHz)
RMS 340mV. Operating quiescent current is 1mA, dropping to
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1mA Quiescent Current
<1A in shutdown. Quiescent current is well controlled; it
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No Protection Diodes Needed
does not rise in dropout as it does with many other regula-
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Controlled Quiescent Current in Dropout
tors. In addition to fast transient response, the LT1963A
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Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V
regulators have very low output noise which makes them
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Adjustable Output from 1.21V to 20V
ideal for sensitive RF supply applications.
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<1A Quiescent Current in Shutdown
Output voltage range is from 1.21V to 20V. The LT1963A
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Stable with 10F Output Capacitor*
regulators are stable with output capacitors as low as
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Stable with Ceramic Capacitors*
10F. Internal protection circuitry includes reverse bat-
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Reverse Battery Protection
tery protection, current limiting, thermal limiting and
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No Reverse Current
reverse current protection. The devices are available in
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Thermal Limiting
fixed output voltages of 1.5V, 1.8V, 2.5V, 3.3V and as
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5-Lead TO-220, DD, 3-Lead SOT-223 and
an adjustable device with a 1.21V reference voltage. The
8-Lead SO Packages
LT1963A regulators are available in 5-lead TO-220, DD,
3-lead SOT-223, 8-lead SO and 16-lead TSSOP packages.
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. Protected by U.S. Patents including 6118263, 6144250.
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3.3V to 2.5V Logic Power Supplies
*See Applications Information Section.
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Post Regulator for Switching Supplies
Typical a T
Dropout Voltage
400
3.3V to 2.5V Regulator
350
2.5V
300
IN OUT
1.5A
+ +
V > 3V 10F*
10F*
IN
250
LT1963A-2.5
200
SHDN SENSE
*TANTALUM,
150
GND
CERAMIC OR
ALUMINUM ELECTROLYTIC
100
1963A TA01
50
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
OUTPUT CURRENT (A)
1963A TA02
1963aff
1
For more information www.linear.com/LT1963A
DROPOUT VOLTAGE (mV)
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ion uresLT1963A Series
a Te Maxi Mu M r a T
(Note 1)
Operating Junction Temperature Range (Note 3)
IN Pin Voltage ........................................................ 20V
LT1963AE ...........................................40C to 125C
OUT Pin Voltage ......................................................20V
LT1963AI............................................40C to 125C
Input to Output Differential Voltage (Note 2) ...........20V
LT1963AMP .......................................55C to 125C
SENSE Pin Voltage ............................................... 20V
Storage Temperature Range ...................65C to 150C
ADJ Pin Voltage ...................................................... 7V
Lead Temperature (Soldering, 10 sec) .................. 300C
SHDN Pin Voltage ................................................. 20V
Output Short-Circuit Duration ........................ Indefinite
p c F T
TOP VIEW
GND 1 16 GND
NC 2 15 NC
FRONT VIEW FRONT VIEW
OUT 3 14 IN
SENSE/
5 SENSE/ADJ*
5
ADJ*
OUT 4 13 IN
4 OUT 17
4 OUT
OUT 5
12 IN
TAB IS
3 GND
3 GND
GND
SENSE/ADJ* 6 11 NC
2 IN 2
IN
GND 7 10 SHDN
1 SHDN 1 SHDN
GND 8 9 GND
Q PACKAGE TAB IS T PACKAGE
GND 5-LEAD PLASTIC TO-220
5-LEAD PLASTIC DD
FE PACKAGE
*PIN 5 = SENSE FOR LT1963A-1.5/LT1963A-1.8/
*PIN 5 = SENSE FOR LT1963A-1.5/LT1963A-1.8/
16-LEAD PLASTIC TSSOP
LT1963A-2.5/LT1963A-3.3
LT1963A-2.5/LT1963A-3.3 EXPOSED PAD (PIN 17) IS GND. MUST BE
= ADJ FOR LT1963A
= ADJ FOR LT1963A SOLDERED TO THE PCB.
T = 150C, = 50C/ W *PIN 6 = SENSE FOR LT1963A-1.5/LT1963A-1.8/
T = 150C, = 30C/ W
JMAX JA JMAX JA
LT1963A-2.5/LT1963A-3.3
= ADJ FOR LT1963A
T = 150C, = 38C/ W
JMAX JA
FRONT VIEW TOP VIEW
3 OUT 1 8 IN
OUT
SENSE/ADJ* 2 7 GND
TAB IS
2
GND
GND
GND 3 6 GND
NC 4 5 SHDN
1
IN
S8 PACKAGE
ST PACKAGE
8-LEAD PLASTIC SO
3-LEAD PLASTIC SOT-223
*PIN 2 = SENSE FOR LT1963A-1.5/LT1963A-1.8/
T = 150C, = 50C/ W
JMAX JA
LT1963A-2.5/LT1963A-3.3
= ADJ FOR LT1963A
T = 150C, = 70C/ W
JMAX JA
1963aff
2
For more information www.linear.com/LT1963A
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