LT7170 datasheet(32/36 Pages) AD

Part #	LT7170

Description	20 A, 16 V, Single- or Dual-Phase, Silent Switcher Step-Down Regulators with Digital Power System Management

PDF	36 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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32 / 36 page

Data Sheet

LT7170/LT7170-1

LAYOUT CONSIDERATIONS

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Rev. A | 32 of 36

Note that large, switched currents flow in the LT7170/LT7170-1 VIN

and PGND pins and the input capacitors. Ensure that the loops

formed by the input capacitors are as small as possible by placing

the input capacitors next to the VIN and PGND pins.

Place the LT7170/LT7170-1 input capacitors, inductor, and output

capacitors on the surface layer of the circuit board and make their

connections on that layer. Place a local, unbroken ground plane

under the application circuit on the layer closest to the surface

layer.

Minimize the routing area of the SW and BOOST switching nodes

to minimize electromagnetic interference (EMI) and to reduce stray

capacitance. For applications that use the full output current capaci-

ty of the LT7170/LT7170-1, ensure that the selection of the PCB

copper thickness and width supports the maximum SW current.

For more detail and PCB design files, refer to the EVAL-LT7170 and

EVAL-LT7170-1 user guides for the LT7170/LT7170-1.

Figure 41. LT7170 Recommended PCB Layout

LT7170 Datasheet(PDF) 32 Page - Analog Devices