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LTM8003 датащи(PDF) 22 Page - Linear Technology

номер детали LTM8003
подробное описание детали  40VIN, 3.5A Step-Down Silent Switcher 關Module Regulator
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производитель  LINER [Linear Technology]
домашняя страница  http://www.linear.com
Logo LINER - Linear Technology

LTM8003 датащи(HTML) 22 Page - Linear Technology

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LTM8003
22
8003fc
For more information www.linear.com/LTM8003
APPLICATIONS INFORMATION
diodes inside the LTM8003 can pull large currents from
the output through the VIN pin. Figure 4 shows a circuit
that runs only when the input voltage is present and that
protects against a shorted or reversed input.
LTM8003
VIN
VIN
8003 F04
RUN
Figure4. The Input Diode Prevents a Shorted Input from
Discharging a Backup Battery Tied to the Output. It Also
Protects the Circuit from a Reversed Input. The LTM8003 Runs
Only When the Input Is Present
PCB Layout
Most of the headaches associated with PCB layout have
been alleviated or even eliminated by the high level of
integration of the LTM8003. The LTM8003 is neverthe-
less a switching power supply, and care must be taken to
minimize EMI and ensure proper operation. Even with the
high level of integration, you may fail to achieve specified
operation with a haphazard or poor layout. See Figure 5
for a suggested layout. Ensure that the grounding and
heat sinking are acceptable.
A few rules to keep in mind are:
1. Place CFF, RFB and RT as close as possible to their
respective pins.
2. Place the CIN capacitor as close as possible to the VIN
and GND connection of the LTM8003.
3. Place the COUT capacitor as close as possible to the
VOUT and GND connection of the LTM8003.
4. Place the CIN and COUT capacitors such that their
ground current flow directly adjacent to or underneath
the LTM8003.
5. Connect all of the GND connections to as large a copper
pour or plane area as possible on the top layer. Avoid
breaking the ground connection between the external
components and the LTM8003.
6. Use vias to connect the GND copper area to the board’s
internal ground planes. Liberally distribute these GND
vias to provide both a good ground connection and
thermal path to the internal planes of the printed circuit
board. Pay attention to the location and density of the
thermal vias in Figure 5. The LTM8003 can benefit from
theheat-sinkingaffordedbyviasthatconnecttointernal
GND planes at these locations, due to their proximity
to internal power handling components. The optimum
SYNC
GND
GND/ THERMAL VIAS
RUN
BIAS
FB
VOUT
VIN
COUT
CIN
PG
TR/SS
RT
8003 F05
Figure5. Layout Showing Suggested External Components, GND Plane and Thermal Vias


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