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Linear Technology Electronic Components Datasheet

LT1963A Datasheet

Fast Transient Response LDO Regulators

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Features
n Optimized for Fast Transient Response
n Output Current: 1.5A
n Dropout Voltage: 340mV
n Low Noise: 40µVRMS (10Hz to 100kHz)
n 1mA Quiescent Current
n No Protection Diodes Needed
n Controlled Quiescent Current in Dropout
n Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V
n Adjustable Output from 1.21V to 20V
n < 1µA Quiescent Current in Shutdown
n Stable with 10µF Output Capacitor*
n Stable with Ceramic Capacitors*
n Reverse Battery Protection
n No Reverse Current
n Thermal Limiting
n 5-Lead TO-220, DD, 3-Lead SOT-223 and
8-Lead SO Packages
Applications
n 3.3V to 2.5V Logic Power Supplies
n Post Regulator for Switching Supplies
LT1963A Series
1.5A, Low Noise,
Fast Transient Response
LDO Regulators
Description
The LT®1963A series are low dropout regulators optimized
for fast transient response. The devices are capable of
supplying 1.5A of output current with a dropout voltage of
340mV. Operating quiescent current is 1mA, dropping to
< 1µA in shutdown. Quiescent current is well controlled; it
does not rise in dropout as it does with many other regula-
tors. In addition to fast transient response, the LT1963A
regulators have very low output noise which makes them
ideal for sensitive RF supply applications.
Output voltage range is from 1.21V to 20V. The LT1963A
regulators are stable with output capacitors as low as
10µF. Internal protection circuitry includes reverse bat-
tery protection, current limiting, thermal limiting and
reverse current protection. The devices are available in
fixed output voltages of 1.5V, 1.8V, 2.5V, 3.3V and as
an adjustable device with a 1.21V reference voltage. The
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
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.
*See Applications Information Section.
Typical Application
VIN > 3V
3.3V to 2.5V Regulator
+
10µF*
IN OUT
LT1963A-2.5
SHDN SENSE
GND
1963A TA01
2.5V
+ 1.5A
10µF*
*TANTALUM,
CERAMIC OR
ALUMINUM ELECTROLYTIC
Dropout Voltage
400
350
300
250
200
150
100
50
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
OUTPUT CURRENT (A)
1963A TA02
For more information www.linear.com/LT1963A
1963aff
1


Linear Technology Electronic Components Datasheet

LT1963A Datasheet

Fast Transient Response LDO Regulators

No Preview Available !

LT1963A Series
Absolute Maximum Ratings
(Note 1)
IN Pin Voltage......................................................... ± 20V
OUT Pin Voltage.......................................................±20V
Input to Output Differential Voltage (Note 2)............±20V
SENSE Pin Voltage ................................................ ± 20V
ADJ Pin Voltage ....................................................... ±7V
SHDN Pin Voltage .................................................. ±20V
Output Short-Circuit Duration ......................... Indefinite
Operating Junction Temperature Range (Note 3)
LT1963AE............................................– 40°C to 125°C
LT1963AI............................................– 40°C to 125°C
LT1963AMP........................................– 55°C to 125°C
Storage Temperature Range....................– 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
Pin Configuration
FRONT VIEW
TAB IS
GND
5 SENSE/ADJ*
4 OUT
3 GND
2 IN
1 SHDN
Q PACKAGE
5-LEAD PLASTIC DD
*PIN 5 = SENSE FOR LT1963A-1.5/LT1963A-1.8/
LT1963A-2.5/LT1963A-3.3
= ADJ FOR LT1963A
TJMAX = 150°C, θJA = 30°C/ W
FRONT VIEW
5
4
3
2
1
SENSE/
ADJ*
OUT
GND
IN
SHDN
TAB IS
T PACKAGE
GND 5-LEAD PLASTIC TO-220
*PIN 5 = SENSE FOR LT1963A-1.5/LT1963A-1.8/
LT1963A-2.5/LT1963A-3.3
= ADJ FOR LT1963A
TJMAX = 150°C, θJA = 50°C/ W
TOP VIEW
GND
NC
OUT
OUT
OUT
SENSE/ADJ*
GND
GND
1
2
3
4
5
6
7
8
16 GND
15 NC
14 IN
17 13 IN
12 IN
11 NC
10 SHDN
9 GND
FE PACKAGE
16-LEAD PLASTIC TSSOP
EXPOSED PAD (PIN 17) IS GND. MUST BE
SOLDERED TO THE PCB.
*PIN 6 = SENSE FOR LT1963A-1.5/LT1963A-1.8/
LT1963A-2.5/LT1963A-3.3
= ADJ FOR LT1963A
TJMAX = 150°C, θJA = 38°C/ W
TAB IS
GND
FRONT VIEW
3 OUT
2 GND
1 IN
ST PACKAGE
3-LEAD PLASTIC SOT-223
TJMAX = 150°C, θJA = 50°C/ W
TOP VIEW
OUT 1
8 IN
SENSE/ADJ* 2
7 GND
GND 3
6 GND
NC 4
5 SHDN
S8 PACKAGE
8-LEAD PLASTIC SO
*PIN 2 = SENSE FOR LT1963A-1.5/LT1963A-1.8/
LT1963A-2.5/LT1963A-3.3
= ADJ FOR LT1963A
TJMAX = 150°C, θJA = 70°C/ W
1963aff
2 For more information www.linear.com/LT1963A


Part Number LT1963A
Description Fast Transient Response LDO Regulators
Maker Linear
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LT1963A Datasheet PDF





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