Linear Technology 1172A User manual

1965

DESCRIPTION

Demonstration circuit 1172A is a low dropout linear

regulator featuring LT®1965, w hich comes in 5-lead

T -220, 5-lead DD-PAK as w ell as the thermally en-

hanced 8-lead M S P and 8-lead 3mmX3mm DFN

packages. The DC1172A has an input voltage range

from 2.3 to 20V, and is capable of delivering up to

1.1A output current. perating quiescent current is

500µA

, reducing to less than

1µA

in shutdow n. The

DC1172A has a very low output noise, w hich makes it

ideal for logic pow er supplies, post regulator for

sw itching supplies and low noise instruments.

The LT1965 datasheet gives a complete description of

the part, operation and application information. The data-

sheet must be read in conjunction w ith this quick start

guide for demo circuit 1172A.

Design files for this circuit board are available. Call

the LTC factory.

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

Pow erPath are trademarks of Linear Technology Corporation.

Perform ance Sum m ary ( TA = 2 oC )

PARAM ETER FOR BUCK REGULATOR CONDITION VALUE

M inimum Input Voltage 2.3V

M aximum Input Voltage 20V

utput Voltage Vout V

=2.5V, I

=1.1A

=2.5V, I

=1.1A

=2.5V, I

=1.1A

=3.3V, I

=1.1A

=3.3V, I

=1.1A

1.2V

+/- 4%

1.5V

+/- 4%

1.8V

+/- 4%

2.5V

+/- 4%

3.3V

+/- 4%

M aximum utput Current 1.1A

Q U ICK STA RT PROCEDU RE

Demonstration circuit 1172A is easy to set up to evaluate

the performance of the LT1965. Refer to Figure 1 for

proper measurement equipment setup and follow the

procedure below :

1. Before proceeding to test, insert jumper JP1

into the FF position, and use V UT Select

jumper J1 for the desired output voltage 1.2V,

1.5V, 1.8V, 2.5V, 3.3V. If the output voltage is

different from the above values, use the USER

select option and install a resistor R5.

2. Apply input voltage across Vin to Gnd. Insert

jumper JP1 into the N position.

Check for the

proper output voltage

nce the proper output voltage is established,

adjust the load w ithin the operating range and

observe the output voltage regulation.

DEMO

C IR C U IT

1 1 7 2

Q U IC K S TAR T G U IDE

L T 1 9 6 5 E

1 .1 A L o w Dro p o u t R e g u a to r

1965

Figure 1.

Proper M easurem ent Equipm ent Setup

Figure 2.

M easuring Input or Output Ripple

1965

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