DC1172A - Demo Manual

DEMO C IR C U IT 1 1 7 2 A
Q U IC K S TAR T GLT1965
U IDE
L T 1 9 6 5 EDD
1 .1 A L o w Dro p o u t R e g u la to r
DESCRIPTION
Demonstration circuit 1172A is a low dropout linear
regulator featuring LT®1965, w hich comes in 5-lead
TO -220, 5-lead DD-PAK as w ell as the thermally enhanced 8-lead M SO 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. O 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 datasheet 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 ofLinear Technology Corporation. ThinSOT and
Pow erPath are trademarks ofLinear Technology Corporation.
Perform ance Sum m ary ( TA = 25oC )
PAR AM ETER FO R BU CK R EG ULATO R
M inimum Input Voltage
M aximum Input Voltage
O utput Voltage Vout
CO N DITIO N
VIN =2.5V,IOUT=1.1A
VIN =2.5V,IOUT=1.1A
VIN =2.5V,IOUT=1.1A
VIN =3.3V,IOUT=1.1A
VIN =3.3V,IOUT=1.1A
M aximum O utput Current
VALU E
2.3V
20V
1.2V +/- 4%
1.5V +/- 4%
1.8V +/- 4%
2.5V +/- 4%
3.3V +/- 4%
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 O FF position, and use VO U T 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 U SER
select option and install a resistor R 5.
2.
Apply input voltage across Vin to G nd. Insert
jumper JP1 into the O N position. Check for the
proper output voltage.
3.
Once the proper output voltage is established,
adjust the load w ithin the operating range and
observe the output voltage regulation.
1
LT1965
Figure 1. Proper M easurem ent Equipm ent Setup
Figure 2. M easuring Input or Output R ipple
2
LT1965
3
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