1

LT1963A Series

1963af

APPLICATIO S

FEATURES

DESCRIPTIO

1.5A, Low Noise,

Fast Transient Response

LDO Regulators

■

Optimized for Fast Transient Response

■

Output Current: 1.5A

■

Dropout Voltage: 340mV

■

Low Noise: 40

■

1mA Quiescent Current

■

No Protection Diodes Needed

■

Controlled Quiescent Current in Dropout

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Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V

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Adjustable Output from 1.21V to 20V

■

<1

mA Quiescent Current in Shutdown

■

Stable with 10

mF Output Capacitor

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Stable with Ceramic Capacitors

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Reverse Battery Protection

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No Reverse Current

■

Thermal Limiting

The LT

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 < 1

mAinshutdown.Quiescentcurrentiswellcontrolled;

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

10

mF. 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.

3.3V to 2.5V Regulator

■

3.3V to 2.5V Logic Power Supplies

■

Post Regulator for Switching Supplies

, LTC and LT are registered trademarks of Linear Technology Corporation.

IN

SHDN

10

µF*

*TANTALUM,

CERAMIC OR

ALUMINUM ELECTROLYTIC

1963 TA01

OUT

SENSE

GND

LT1963A-2.5

2.5V

1.5A

10

µF*

+

+

OUTPUT CURRENT (A)

0

200

300

1.6

1963 TA02

100

0

0.4

0.8

1.2

0.2

0.6

1.0

1.4

400

150

250

50

350

Dropout Voltage