Controller

VOUT

GND

GND

VIN

Inductor

CIN

CIN

COUT

COUT

QH

QL

Place controller as

close to the switches

33

LM2743

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SNVS276I – APRIL 2004 – REVISED FEBRUARY 2019

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9 Power Supply Recommendations

The LM2743 is a power management device. The power supply for the device is any DC voltage source within

the specified input range (see Design Requirements).

10 Layout

10.1 Layout Guidelines

In a buck regulator, the primary switching loop consists of the input capacitor and MOSFET switches. Minimixing

the area of this loop reduces the stray inductance, and minimizes noise and possible erratic operation. High

quality input capacitors should be placed as close as possible to the MOSFET switches, with the positive side of

the input capacitor connected directly to the high-side MOSFET drain, and the ground side of the capacitor

connected as close as possible to the low-side MOSFET switch ground connection. Connect all of the low power

ground connections directly to the SGND pin. Connect the VCC capacitor directly to the PGND pin.

10.2 Layout Example

Figure 44. Layout Recommendation