VOUT

GND

LM2767

CAP-

CAP+

V+

LM2767

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SNVS069D – FEBRUARY 2000 – REVISED AUGUST 2015

10 Power Supply Recommendations

The LM2767 is designed to operate from as an inverter over an input voltage supply range from 1.8 V and 5.5 V.

This input supply must be well-regulated and capable to supply the required input current. If the input supply is

located far from the device, additional bulk capacitance may be required in addition to the ceramic bypass

capacitors.

11 Layout

11.1 Layout Guidelines

Use the following steps as a reference to ensure the device is stable across its intended operating voltage and

current range.

•

Place CIN on the top layer (same layer as the LM2767) and as close to the device as possible. Connecting

the input capacitor through short, wide traces to both the V+ and GND pins reduces the inductive voltage

spikes that occur during switching which can corrupt the V+ line.

•

Place COUT on the top layer (same layer as the LM2767) and as close as possible to the OUT and GND pin.

The returns for both CIN and COUT must come together at one point, as close to the GND pin as possible.

Connecting COUT through short, wide traces reduce the series inductance on the OUT and GND pins that

can corrupt the VOUT and GND lines and cause excessive noise in the device and surrounding circuitry.

•

Place C1 on the top layer (same layer as the LM2767 device) and as close to the device as possible.

Connect the flying capacitor through short, wide traces to both the CAP+ and CAP– pins.

11.2 Layout Example

Figure 16. LM2767 Layout Example

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Product Folder Links: LM2767