Linear Technology LT8570, Demo Manual

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dc2297afb
DEMO MANUAL DC2297A
DESCRIPTION
LT8570, LT8570-1
Boost/SEPIC/Inverting Regulator
Demonstration circuits 2297A-A and 2297A-B feature the
LT
®
8570 and LT8570-1 in a boost configuration. These
demo circuits demonstrate small size and low component
count. Both converters are designed to convert a 5V to
10V source to 12V. Refer to Figures 3 and 4 for maximum
load current at different input voltage levels.
Both converters use only one feedback resistor to set the
output voltage.
The LT8570 can operate with inputs as high as 40V but
in these demo circuits, the input is limited by the voltage
rating of the input capacitors, and the magnitude of the
output voltage.
PERFORMANCE SUMMARY
The LT8570 and LT8570-1 include many other features
such as synchronization to external clock, user configurable
undervoltage lockout, soft-start, frequency foldback, and
other features that are easily configured as Boost, SEPIC
or Inverting Converters.
The data sheet gives a complete description of the device,
operation and application information. The data sheet must
be read in conjunction with this demo manual for DC2297A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2297A
L
, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
Specifications are at T
A
= 25°C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DC2297A-A
V
IN
Input Supply Range 5 10 V
V
OUT
Output Voltage V
IN
= 5V, I
LOAD
= 125mA 11.64 12 12.36 V
RIPPLE V
IN
= 5V, I
LOAD
= 125mA 25 mV
EFFICIENCY V
IN
= 5V, I
LOAD
= 125mA 86 %
SWITCHING FREQUENCY 1.5 MHz
DC2297A-B
V
IN
Input Supply Range 5 10 V
V
OUT
Output Voltage V
IN
= 5V, I
LOAD
= 60mA 11.64 12 12.36 V
RIPPLE V
IN
= 5V, I
LOAD
= 60mA 5 mV
EFFICIENCY V
IN
= 5V, I
LOAD
= 60mA 86 %
SWITCHING FREQUENCY 1.5 MHz