DC1408A - Demo Manual

DEMONSTRATION CIRCUIT 1408
QUICK START GUIDE
LT3029
Dual 500mA/500mA Low Dropout, Low Noise,
Micropower Linear Regulator
DESCRIPTION
Demonstration circuit 1408 is a dual 500mA/500mA
linear regulator featuring LT®3029. LT3029 is a
dual, micro-power, low noise and low dropout voltage linear regulator. The device operates either with
a common input supply or independent input supplies for each channel, over an input range of 1.8V
to 20V. Each output supplies up to 500mA of output
current with a typical dropout voltage of 300mV. A
10nF bypass capacitor reduces output noise to
20µVRMS in a 10Hz to 100kHz bandwidth. The low
55µA quiescent current per channel makes it an idea
choice for battery-powered systems. Shutdown control is independent for each channel, allowing for
flexible power management.
down. The current limiting should be considered for
the input voltage range under full load condition.
LT3029 optimizes the stability and transient response with low ESR ceramic cap, requiring a
minimum of 3.3µF. Internal circuitry provides reverse-battery protection, reverse-current protection,
current limiting with foldback and thermal shut-
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Table 1.
The device is available in the thermally-enhanced
16-Lead 4mm×3mm×0.75mm DFN and 16-lead
MSOP packages.
The LT3029 datasheet gives a complete description
of the part, operation and application information.
The datasheet must be read in conjunction with this
quick start guide for demo circuit 1408.
Design files for this circuit board are available.
Call the LTC factory.
Performance Summary (TA = 25oC)
PARAMETER
CONDITION
VALUE
Minimum Input Voltage
2.3V
Maximum Input Voltage
20V
Output Voltage VOUT
Shunt at 3,4 for JP3 and JP4
1.794V ±2.6%
Maximum Output Current Per Channel
VIN=2.5V, VOUT=1.8V
500mA
QUICK START PROCEDURE
Demonstration circuit 1408 is easy to set up to
evaluate the performance of the LT3029. Refer to
Figure 1 for proper measurement equipment setup
and follow the procedure below:
NOTE: Make sure that the input voltage does not
exceed 20V.
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DEMONSTRATION CIRCUIT 1408
QUICK START GUIDE
NOTE: The shutdown jumper JP1 and JP2 shunt is
required to be placed in the OFF or ON position
for proper operation.
ing to the output voltage selection jumper (JP3
and JP4).
NOTE: If
the output voltage is too low, temporarily disconnect the load to make sure that the
load is not set too high.
NOTE: Place the output voltage selection jumper
JP3 and JP4 at the desired position.
1.
Connect the power supply (with power off),
load, and meters as shown in Figure 1.
2.
After all connections are made, turn on input
power and verify that the output voltage accord-
3.
Once the proper output voltages are established,
adjust the load within the operating range and
observe the output voltage regulation, efficiency
and other parameters.
Figure 1. Proper Measurement Equipment Setup
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DEMONSTRATION CIRCUIT 1408
QUICK START GUIDE
3
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