QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 862
MICROPWER REGULATED CHARGE PUMP DC/DC CONVERTER
2
QUICK START PROCEDURE
Demonstration circuit 862 is easy to set up to evaluate
the performance of the LTC3221EDC-3.3, LTC3221EDC-
5, and LTC3221EDC. Refer to Figure 1 for proper meas-
urement equipment setup and follow the procedure be-
low:
NOTE:
When measuring the input or output voltage rip-
ple, care must be taken to avoid a long ground lead on
the oscilloscope probe. Measure the input or output
voltage ripple by touching the probe tip directly across
the Vin or Vout and GND terminals. See Figure 2 for
proper scope probe technique.
1.
Place jumper JP1 to the ON position.
2.
With power off, connect a 1.8V-5.5V power supply to
Vin and GND. The supply should be capable of provid-
ing 200mA current.
3.
Connect a load to Vout and GND.
4.
Turn on the power at the input.
NOTE:
Make sure that the input voltage does not ex-
ceed the corresponding maximum voltage (e.g. 4.4V
for DC862A-A, 5.5V for DC862A-B, 3.8V for DC862A-
C).
5.
Check for the proper output voltages. For DC863A-A,
Vout should be within 3.168V to 3.432V. For DC862A-
B, Vout should be within 4.8V to 5.2V. For DC862A-C,
Vout is should be within 2.88V to 3.12V.
NOTE:
If there is no output, temporarily disconnect the
load to make sure that the load is not set too high.
6.
Once the proper output voltages are established, ad-
just the loads within the operating range and observe
the output voltage regulation, ripple voltage, efficiency
and other parameters.
Figure 1.
Proper Measurement Equipment Setup