3
dc1973af
DEMO MANUAL DC1973A
Quick start proceDure
Demonstration circuit 1973A is easy to set up to evalu-
ate the performance of the LT8697. Refer to Figure 2 and
Figure 3 for proper measurement equipment setup and
follow the procedure below:
1. With power off, connect the input power supply to V
IN
and GND.
2. With power off, connect the load to VCABLE and C_GND.
3. Set X1 to X5 to OPEN positions.
4. Turn on the power at the input.
5. Carefully evaluate other design parameters as needed.
6. If a USB device is to be connected to J3, use Table 1 as
a guide to set X1 to X4 for different USB applications.
The total current provided at J3 and VCABLE should
not exceed 2.1A.
7. Set X5 to V+ if a quick transient test is desirable. The
load step applied to VCABLE is 500mA. Again, make
sure the total load current does not exceed 2.1A during
the test.
performance summary
Specifications are at T
A
= 25°C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
IN
Input Supply Range
6
42
V
V
OUT
Output Voltage
4.8
5
5.2
V
Max I
OUT
Maximum Output Current
2.1
A
f
SW
Switching Frequency
1.9
2
2.05
MHz
EFE
Efficiency at DC
I
OUT
= 2.1A, Measured at V
OUT
91
%
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