LT1963A Series
1.5A, Low Noise,
Fast Transient Response
LDO Regulators
FEATURES
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
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 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 regula-
tors are available in 5-lead TO-220, DD, 3-lead SOT-223,
8-lead SO and 16-lead TSSOP packages.
, LTC and LT are registered trademarks 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.
Optimized for Fast Transient Response
Output Current: 1.5A
Dropout Voltage: 340mV
Low Noise: 40μV
RMS
(10Hz to 100kHz)
1mA Quiescent Current
No Protection Diodes Needed
Controlled Quiescent Current in Dropout
Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V
Adjustable Output from 1.21V to 20V
< 1μA Quiescent Current in Shutdown
Stable with 10μF Output Capacitor*
Stable with Ceramic Capacitors*
Reverse Battery Protection
No Reverse Current
Thermal Limiting
5-Lead TO-220, DD, 3-Lead SOT-223 and
8-Lead SO Packages
APPLICATIONS
n
n
3.3V to 2.5V Logic Power Supplies
Post Regulator for Switching Supplies
TYPICAL APPLICATION
Dropout Voltage
3.3V to 2.5V Regulator
DROPOUT VOLTAGE (mV)
IN
10μF*
OUT
2.5V
1.5A
10μF*
400
350
+
V
IN
> 3V
+
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
LT1963A-2.5
SHDN
SENSE
GND
1963A TA01
*TANTALUM,
CERAMIC OR
ALUMINUM ELECTROLYTIC
1963afd
1
LINER [ LINEAR TECHNOLOGY ]
