LT1963A Series
1.5A, Low Noise,
Fast Transient Response
LDO Regulators
Features
Description
Optimized for Fast Transient Response
Output Current: 1.5A
n Dropout Voltage: 340mV
n Low Noise: 40µV
RMS (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
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 regulators. 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 battery 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.
n
n
Applications
n
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.
n
*See Applications Information Section.
3.3V to 2.5V Logic Power Supplies
Post Regulator for Switching Supplies
Typical Application
Dropout Voltage
400
3.3V to 2.5V Regulator
VIN > 3V
+
IN
10µF*
OUT
LT1963A-2.5
SHDN
+
2.5V
1.5A
10µF*
SENSE
GND
1963A TA01
*TANTALUM,
CERAMIC OR
ALUMINUM ELECTROLYTIC
DROPOUT VOLTAGE (mV)
350
300
250
200
150
100
50
0
0
0.2
0.4 0.6 0.8 1.0 1.2
OUTPUT CURRENT (A)
1.4 1.6
1963A TA02
1963aff
For more information www.linear.com/LT1963A
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