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Linear Technology LT8570 Demo Manual
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Linear Technology LT8570 Demo Manual

Boost/sepic/inverting regulator
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DESCRIPTION
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
SYMBOL
PARAMETER
DC2297A-A
V
Input Supply Range
IN
V
Output Voltage
OUT
RIPPLE
EFFICIENCY
SWITCHING FREQUENCY
DC2297A-B
V
Input Supply Range
IN
V
Output Voltage
OUT
RIPPLE
EFFICIENCY
SWITCHING FREQUENCY
DEMO MANUAL DC2297A
Boost/SEPIC/Inverting Regulator
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
= 25°C
A
CONDITIONS
V
= 5V, I
= 125mA
IN
LOAD
V
= 5V, I
= 125mA
IN
LOAD
V
= 5V, I
= 125mA
IN
LOAD
V
= 5V, I
= 60mA
IN
LOAD
V
= 5V, I
= 60mA
IN
LOAD
V
= 5V, I
= 60mA
IN
LOAD
LT8570, LT8570-1
MIN
TYP
MAX
5
10
11.64
12
12.36
25
86
1.5
5
10
11.64
12
12.36
5
86
1.5
UNITS
V
V
mV
%
MHz
V
V
mV
%
MHz
dc2297afb
1

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Summary of Contents for Linear Technology LT8570

  • Page 1 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. output voltage.
  • Page 2 Demo circuit 2297A is easy to set up to evaluate the per- 2. Turn on the power at the input. formance of the LT8570 and LT8570-1. Refer to Figure 1 NOTE: Make sure that the input voltage does not for proper measurement equipment setup and follow the exceed 10V.

  • Page 3: Quick Start Procedure

    DEMO MANUAL DC2297A QUICK START PROCEDURE INPUT (V) INPUT (V) DC2297A F03 DC2297A F05 Figure 3. DC2297A-A Max Load Current vs Input Voltage Figure 5. DC2297A-A Efficiency at 5V INPUT (V) INPUT (V) DC2297A F04 DC2297A F06 Figure 4. DC2297A-B Max Load Current vs Input Voltage Figure 6.

  • Page 4: Parts List

    DEMO MANUAL DC2297A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC2297A-A Required Circuit Components for Boost Regulator CAP., CER., 4.7µF, X7R, 16V, 10%, 0805 MURATA, GRM21BR71C475KA73L CAP., CER., 0.1µF, X7R, 16V, 10%, 0402 MURATA, GRM155R71C104KA88D CAP., CER., 2.2nF, X7R, 16V, 10%, 0402 AVX, 0402YC222KAT2A CAP., CER., 47pF, C0G, 25V, 5%, 0402 AVX, 04023A470JAT2A...

  • Page 5: Schematic Diagram

    Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
  • Page 6 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.
  • Page 7 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Analog Devices Inc. DC2297A-A DC2297A-B...

This manual is also suitable for:

Lt8570-1