Linear Technology DC660 Manuale utente

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 660

LOW NOISE MICROPOWER LINEAR VOLTAGE REGULATOR

LTC1844

DESCRIPTION

Demonstration circuit DC660 is a low noise micro-

power voltage regulator using the LTC1844 ultra-low

dropout CMOS linear regulator, which comes in a tiny

5-Pin SOT-23 package. The DC660 has an input volt-

age range from 1.8V to 6.5V, and is capable of deliv-

ering 150 mA max. The DC660 is able to use ceramic

capacitors, due to the LTC1844 capability of maintain-

ing stability with ultra-low ESR capacitors. With the

small size ceramic capacitors, tiny SOT-23 package of

the LTC1844, plus its low quiescent current –

maximum 80uA over temperature, the DC660 voltage

regulator is ideally suited for hand-held applications,

such as cellular phones or PDAs.

Gerber files for this circuit are available. Call the

LTC Factory.

QUICK START PROCEDURE

DC660 is easy to set up for evaluating the perform-

ance of the LTC1844. For proper measurement

equipment configuration, set up the circuit accord-

ing to the diagram in Figure 1.

Please follow the procedure outlined below for

proper operation.

1. Before proceeding to test, insert jumper JP1

into the 1.5V option and apply no load

across Vout.

2. Apply 1.6V across Vin (to Gnd). Draw

10mA of load current. Measure Vout; it

should be 1.5V +/- 2% (1.47V to 1.53V).

3. Vary the input voltage from 1.6V to 6.5V

and the load current from 10 mA to 100 mA.

Vout should measure 1.5V +/- 4% (1.44V to

1.56V).

4. Turn off the input power and move jumper

JP1 into any of the remaining output voltage

options: 1.8V, 2.5V, 2.8V, or 3.3V. Re-apply

power, and, just as in the 1.5V test, the out-

put voltage should read Vout +/- 2% toler-

ance under static line and load conditions,

and +/- 4% tolerance under dynamic line

and load conditions.

5. When finished evaluating, turn off the input

power.

Warning - If long leads are used to power the demo

circuit, the input voltage at the part could “ring”.

This ringing could affect the operation of the circuit

or even exceed the maximum voltage rating of the

IC. To eliminate this, insert a small tantalum ca-

pacitor (for instance, an AVX part #

TAJW226M010R) on the pads between the input

power and return terminals on the bottom of the

demo board. The (greater) ESR of the tantalum will

dampen the (possible) ringing voltage due to the

use of long input leads. On a normal, typical PCB,

with short traces, the capacitor is not needed.

Downloaded from Arrow.com.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 660

LOW NOISE MICROPOWER LINEAR VOLTAGE REGULATOR

Figure 1. Proper Measurement Equipment Setup

Figure 2. Measuring Input or Output Ripple

Downloaded from Arrow.com.Downloaded from Arrow.com.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 660

LOW NOISE MICROPOWER LINEAR VOLTAGE REGULATOR

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

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