MP6546

– 22V, 3A PEAK, 3-PHASE BLDC DRIVER WITH 1MHZ I2C INTERFACE

MP6546 Rev. 1.0

MonolithicPower.com

20

3/20/2023

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APPLICATION INFORMATION

Selecting an External Schottky Diode

In applications where thermal shutdown might be

triggered, add a Schottky diode in parallel with

the three-phase outputs to VIN (D1, D2, and D3

for phase A, phase B, and phase C, respectively)

to improve the current capacity and temperature

tolerance range.

In general, it is recommended to use a diode with

a 30V reverse breakdown voltage, 1A forward

continuous current, and SOT-123 package.

Selecting the Input Capacitor

The input capacitors (C1 and C2) can reduce the

device’s switching noise and the surge current

drawn from the input supply. Use larger-value

ceramic capacitors with X5R or X7R dielectrics

for their low ESR and temperature coefficients.

In general, it is recommended to use two ceramic

capacitors (each VIN pin requires a capacitor) of

10

μF rated for at least 25V.

ADDR Pull-Up Power

The MP6546 checks the ADDR level status

100µs after start-up. If the pull-up power rises too

slowly, an incorrect slave address might be set.

It is recommended to pull the ADDR pin to the

3.3V pin if the address is set to 0x09h by the

ADDR pin.

PCB Layout Guidelines

Efficient

PCB

layout

is

critical

for

stable

operation. For the best results, follow the

guidelines below:

1. Use wider copper for the input, output, and

GND-connecting wire to improve thermal

performance.

2. Place GND vias near the input capacitor to

improve thermal performance and reduce

ground impedance.

3. Connect PGND and AGND as close to one

another as possible.

4. Do not to introduce power circuit interference

to the analog circuit.

Top Layer

Bottom Layer

Figure 8: Recommended PCB Layout