QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 700
2.4MHZ, 2-PHASE BOOST CONVERTER
LTC3428EDD
DESCRIPTION
Demonstration circuit 700 is a 2.4MHz, Dual Phase
Step-Up DC/DC Converter featuring the LTC3428EDD.
The demo board demonstrates a dual phase DC/DC
boost converter, with a 2A switch (per phase), capa-
ble of providing either 5V at 2A or 3.3V at 1.5A. The
circuit demonstrates the advantages of the dual phase
architecture for an effective switching frequency of
2.4MHz. Small circuit size and low component count
makes the LTC3428 suitable for use in many space-
Table 1. Performance Summary (T
A
= 25°C)
PARAMETERS FOR 5V OUT
Minimum Input Voltage
Maximum Input Voltage
Output Voltage V
OUT
Maximum Output Current
Typical Output Ripple V
OUT
Typical efficiency
PARAMETERS FOR 3.3V OUT
Minimum Input Voltage
Maximum Input Voltage
Output Voltage V
OUT
Maximum Output Current
Typical Output Ripple V
OUT
Typical efficiency
V
IN
= 2.5V, I
OUT
= 1.5A
V
IN
= 1.8V to 3V, I
OUT
= 1.5A
V
IN
= 1.8V to 3V, I
OUT
= 0A to 1.5A
V
IN
= 3.3V, I
OUT
= 2A
V
IN
= 5V, I
OUT
= 2A
CONDITION
V
IN
= 3.3V, I
OUT
= 0A to 2A
CONDITION
VALUE
3.3V
4.5V
5V ±4%
2A
20mV
P–P
87.5%
VALUE
1.8V
3.3V
3.3V ±4%
1.5A
20mV
P–P
81%
conscious applications such as handheld instru-
ments, point-of-load converters, digital cameras, cel-
lular phones, distributed power and networking
equipment. Other integrated features include internal
soft-start, antiringing control and thermal shutdown.
Design files for this circuit board are available. Call
the LTC factory.
LTC is a trademark of Linear Technology Corporation
Input capacitor C1 used only for operation with long inductive input leads. See Application Note 88 for further
details.
1
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 700
2.4MHZ, 2-PHASE BOOST CONVERTER
QUICK START PROCEDURE
Demonstration circuit 700 is easy to set up to evalu-
ate the performance of the LTC3428EDD. Refer to
Figure 1 for proper measurement equipment setup
and follow the procedure below:
NOTE:
When measuring the input or output voltage
NOTE:
Once the proper output voltages are estab-
lished, adjust the loads within the operating range
and observe the output voltage regulation, ripple volt-
age, efficiency and other parameters.
NOTE:
Steps 5-9 are for 3.3V operation only.
5.
Place jumper in the following positions:
ripple, care must be taken to avoid a long ground lead
on the oscilloscope probe. Measure the input or out-
put voltage ripple by touching the probe tip directly
across the Vin or Vout and GND terminals. See
Figure 2 for proper scope probe technique.
NOTE:
Steps 1-4 are for 5V operation only.
1.
Place jumpers in the following positions:
JP1
Run, JP2 Removed.
6.
With power off, connect the input power supply to
VIN and GND.
7.
Turn on the power at the input.
NOTE:
Make sure that the input voltage is set be-
JP1
Run, JP2 on.
2.
With power off, connect the input power supply to
tween 1.8V and 3.3V.
8.
Check for the proper output voltages.
NOTE:
If there is no output, temporarily disconnect
VIN and GND.
3.
Turn on the power at the input.
NOTE:
Make sure that the input voltage does not ex-
the load to make sure that the load is not set too
high.
9.
Once the proper output voltages are established,
ceed 4.5V.
4.
Check for the proper output voltages.
NOTE:
If there is no output, temporarily disconnect
adjust the loads within the operating range and ob-
serve the output voltage regulation, ripple voltage,
efficiency and other parameters.
the load to make sure that the load is not set too
high.
2
Embedded System
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