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Description
Demonstration circuit
synchronous step-down regulator featuring the LT8609.
The demo board is designed for 5V output from a 5.5V to
42V input. The wide input range allows a variety of input
sources, such as automotive batteries and industrial sup-
plies. The LT8609 is a compact, high efficiency, high speed
synchronous monolithic step-down switching regulator
that consumes only 2.5μA of quiescent current when
output is regulated at 5V. Top and bottom power switches,
compensation components and other necessary circuits
are inside of the LT8609 to minimize external components
and simplify design.
The SYNC pin on the demo board is grounded by default
for low ripple burst mode operation. Move JP1 to PULSE
SKIPPING position can change the operation mode to pulse-
skipping operation. Once JP1 is on SPREAD SPECTRUM
position, V
is applied to the SYNC pin for low EMI spread
CC
spectrum operation. To synchronize to an external clock,
performance summary
SYMBOL
PARAMETER
V
Input Voltage Range
IN
V
Output Voltage
OUT
I
Maximum Output Current
OUT
f
Switching Frequency
SW
EFE
Efficiency at DC
Arrow.com.
Downloaded from
42V, 2A Micropower Synchronous
2195A
is a 42V, 2A micropower
Specifications are at T
CONDITIONS
V
DEMO MANUAL DC2195A
Step-Down Regulator
move JP1 to SYNC and apply the external clock to the
SYNC turret. Figure 1 shows the efficiency of the circuit.
The demo board has an EMI filter installed. Under spread
spectrum operation, the radiated EMI performances of the
board (with EMI filter) are shown in Figures 2 and 3. The red
lines in Figures 2 and 3 are CISPR25 Class 5 peak limit. To
use the EMI filter, the input should be tied to VEMI, not V
This board is suitable for a wide range of automotive,
telecom, industrial, and other applications.
The LT8609 data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this demo manual
for DC2195A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2195A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
= 25°C
A
= 12V, I
= 1A
IN
OUT
LT8609
MIN
TYP
MAX
UNITS
5.5
42
4.8
5
5.2
2
1.85
2
2.15
93
dc2195afb
1
.
IN
V
V
A
MHz
%
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Related Manuals for Linear Technology DC2195A
Summary of Contents for Linear Technology DC2195A
- Page 1 V is applied to the SYNC pin for low EMI spread L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear spectrum operation. To synchronize to an external clock, Technology Corporation. All other trademarks are the property of their respective owners.
- Page 2 DEMO MANUAL DC2195A Quick start proceDure DC2195A is easy to set up to evaluate the performance a. If efficiency measurements are desired, an ammeter of the LT8609. Refer to Figure 4 for proper measurement can be put in series with the output load in order to equipment setup and follow the procedure below: measure the DC2195A’s output current.
- Page 3 DEMO MANUAL DC2195A Quick start proceDure Figure 2. LT8609 Demo Circuit EMI Performance in CISPR25 Radiated Emission Test, Antenna Polarization: Vertical (V = 14V, V = 5V, I = 2A, 2MHz Switching Frequency, Spread Spectrum Mode operation) Figure 3. LT8609 Demo Circuit EMI Performance in CISPR25 Radiated Emission Test, Antenna Polarization:...
- Page 4 DEMO MANUAL DC2195A Quick start proceDure – – POWER SUPPLY – – LOAD – – Figure 4. Proper Measurement Equipment Setup Figure 5. Measuring Output Ripple dc2195afb Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from...
- Page 5 DEMO MANUAL DC2195A Quick start proceDure Figure 6. DC2195A 1A to 2A Load Transient dc2195afb Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
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Page 6: Parts List
DEMO MANUAL DC2195A parts List ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP., X7R, 4.7µF, 50V, 10%, 1206 MURATA, GRM31CR71H475K CAP., X7R, 0.22µF, 16V, 10%, 0603 AVX, 0603YC224KAT2A CAP., C0G, 10pF, 25V, 5%, 0603 AVX, 06033A100JAT2A CAP., X7R, 47µF, 10V, 10%, 1210 MURATA, GRM32ER71A476KE20L CAP., X7R, 1.0µF, 25V, 10%, 0603... -
Page 7: 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 8 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.
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