LT1963A Series

1

1963afe

Typical applicaTion

DescripTion

1.5A, Low Noise,

Fast Transient Response

LDO Regulators

FeaTures

applicaTions

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Optimized for Fast Transient Response

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Output Current: 1.5A

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Dropout Voltage: 340mV

n

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1mA Quiescent Current

n

No Protection Diodes Needed

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Controlled Quiescent Current in Dropout

n

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

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Adjustable Output from 1.21V to 20V

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<1µA Quiescent Current in Shutdown

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Stable with 10µF Output Capacitor*

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Stable with Ceramic Capacitors*

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Reverse Battery Protection

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No Reverse Current

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Thermal Limiting

n

5-Lead TO-220, DD, 3-Lead SOT-223 and

8-Lead SO Packages

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.

3.3V to 2.5V Regulator

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3.3V to 2.5V Logic Power Supplies

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Post Regulator for Switching Supplies

IN

SHDN

10µF*

*TANTALUM,

CERAMIC OR

ALUMINUM ELECTROLYTIC

1963A TA01

OUT

SENSE

GND

LT1963A-2.5

2.5V

1.5A

10µF*

+

+

OUTPUT CURRENT (A)

0

200

300

1.6

1963A TA02

100

0

0.4

0.8

1.2

0.2

0.6

1.0

1.4

400

150

250

50

350

Dropout Voltage

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.