LT1963AES8 Datasheet, PDF (1/20 Pages) Linear Technology – 1.5A, Low Noise, Fast Transient Response LDO Regulators

LT1963A Series
1.5A, Low Noise,
Fast Transient Response
LDO Regulators
FEATURES
■ _{Optimized for Fast Transient Response}
■ _{Output Current: 1.5A}
■ _{Dropout Voltage: 340mV}
■ _{Low Noise: 40mVRMS (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}
■ _{< 1mA Quiescent Current in Shutdown}
■ _{Stable with 10mF Output Capacitor}
■ _{Stable with Ceramic Capacitors}
■ _{Reverse Battery Protection}
■ _{No Reverse Current}
■ _{Thermal Limiting}
U
APPLICATIO S
■ _{3.3V to 2.5V Logic Power Supplies}
■ _{Post Regulator for Switching Supplies}
DESCRIPTIO
The LT^®1963A series are low dropout regulators opti-
mized 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 < 1mA 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
10mF. Small ceramic capacitors can be used without the
necessary addition of ESR as is common with other
regulators. 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 and 8-lead SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
V_IN > 3V
3.3V to 2.5V Regulator
+
10µF*
IN
OUT
LT1963A-2.5
SHDN SENSE
GND
1963 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)
1963 TA02
1963af
1