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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-
Table 1.
Performance Summary (T A = 25°C)
PARAMETER
Minimum Input Voltage
Maximum Input Voltage
Output Voltage V OUT
Typical Dropout Voltage
Output Regulation
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.
When measuring the input or output ripple or
NOTE:
noise voltage, care must be taken to avoid a long
ground lead on the oscilloscope probe. Measure the
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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 886
CONDITION
V IN = 1.7V to 5.5V, I OUT = 0A to 300mA
V IN = 1.7V, I OUT = 300mA
Line
Load
300mA VERY LOW DROPOUT LINEAR REGULATOR
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.
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
1.
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
2.
shunt into that output voltage jumper position.
LTC3035
VALUE
1.7V
5.5V
1.8V ±3%
45mV
±0.5%
±0.5%
1
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Related Manuals for Linear Technology DEMONSTRATION CIRCUIT 886
Summary of Contents for Linear Technology DEMONSTRATION CIRCUIT 886
- Page 1 Due to the 0.4V reference of the LTC3035, the DC886 is capable of supplying power to very low voltage applica- , LTC and LT are registered trademarks of Linear Technology Corporation. tions, such as a (relatively) high current voltage refer- Table 1.
- Page 2 QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 886 300mA VERY LOW DROPOUT LINEAR REGULATOR Apply 5V at VIN. Measure VOUT; it should read 0V. Vary the input voltage from VOUT plus the dropout If desired, one can measure the shutdown supply voltage (45mV typically at 300mA of output cur- current at this point.
- Page 3 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 Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from...
- Page 4 QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 886 300mA VERY LOW DROPOUT LINEAR REGULATOR Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from...
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