Linear Technology DEMONSTRATION CIRCUIT 886 Manuale utente

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 886

300mA VERY LOW DROPOUT LINEAR REGULATOR

LTC3035

DESCRIPTION

Demonstration circuit 886 is an ultra-low input voltage

and dropout voltage supply using the LTC3035 linear

regulator, which comes in a very small 8-pin DFN pack-

age. The DC886 has an input voltage range from 1.7V to

5.5V, an output voltage range between 0.4V and 3.6V,

and is capable of delivering 300mA of output current.

Due to the 0.4V reference of the LTC3035, the DC886 is

capable of supplying power to very low voltage applica-

tions, such as a (relatively) high current voltage refer-

ences. The DC886 comes assembled with small ceramic

capacitors – 1uF – to demonstrate the LTC3035 main-

taining stability with ceramic output capacitors.

Design files for this circuit board are available. Call

the LTC factory.

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

Table 1.

Performance Summary (TA= 25°C)

PARAMETER CONDITION VALUE

Minimum Input Voltage 1.7V

Maximum Input Voltage 5.5V

Output Voltage VOUT VIN = 1.7V to 5.5V, IOUT = 0A to 300mA 1.8V ±3%

Typical Dropout Voltage VIN = 1.7V, IOUT = 300mA 45mV

Line ±0.5%

Output Regulation Load ±0.5%

QUICK START PROCEDURE

The DC886 demonstration board is easy to set up to

evaluate the performance of the LTC3035. For proper

measurement equipment configuration, set up the

circuit according to the diagram in Figure 1. Before

proceeding to test, insert jumper JP5 shunt into the

off (lower) position, connecting the RUN pin to

ground (GND), which shuts down the circuit.

NOTE:

When measuring the input or output ripple or

noise voltage, care must be taken to avoid a long

ground lead on the oscilloscope probe. Measure the

voltages by touching the probe tip directly across the

VIN or VOUT and GND terminals. See Figure 2 for

proper scope probe technique.

Connect the input power supply and the load to the

board. Do not hot-plug VIN or increase VIN over

the rated maximum supply voltage of 5.5V, or the

part may be damaged. Refer to Figure 1 for the

proper measurement equipment setup.

Select any of the output voltages by inserting a

shunt into that output voltage jumper position.

Downloaded from Arrow.com.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 886

300mA VERY LOW DROPOUT LINEAR REGULATOR

Apply 5V at VIN. Measure VOUT; it should read 0V.

If desired, one can measure the shutdown supply

current at this point. The supply current will be

approximately 1uA in shutdown.

Turn on the circuit by inserting the shunt on

jumper JP5 into the ON (upper) position. The out-

put voltage should be regulating to +/-2% of its se-

lected value (see the table below).

Vary the input voltage from VOUT plus the dropout

voltage (45mV typically at 300mA of output cur-

rent) to 5.5V and adjust the load current from 0 to

300mA. VOUT should read +/-3% of its selected

value (see the table below).

When finished, turn off the circuit by inserting the

shunt on jumper JP5 into the OFF (lower) position.

Max Load or Max Load and

No Load Line Variation Line Variation

2% 2.5% 3%

VOUT = 1.8V 1.764V – 1.836V 1.755V – 1.845V 1.746V – 1.854V

VOUT = 2.5V 2.45V – 2.55V 2.437V – 2.563V 2.425V – 2.575V

VOUT = 3.3V 3.234V – 3.366V 3.217V – 3.383V 3.201V – 3.399V

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

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 886

300mA VERY LOW DROPOUT LINEAR REGULATOR

Figure 1. Proper Measurement Equipment Setup

Figure 2. Measuring Input or Output Ripple

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

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 886

300mA VERY LOW DROPOUT LINEAR REGULATOR

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

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