MP6605C

– 4-CHANNEL LOW-SIDE DRIVER WITH I2C INTERFACE

MP6605C Rev. 1.0

MonolithicPower.com

12

7/11/2022

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APPLICATION INFORMATION

Selecting External Components

A 100nF, X7R ceramic bypass capacitor must be

placed at the VIN pin. An additional, 4.7µF

minimum ceramic capacitor should be placed

nearby. If the device is located far from the

power

source,

additional

electrolytic

bulk

capacitance may be needed.

When the current is turned off, the VCLAMP pin

dissipates the energy in an inductive load.

Depending on the application, VCLAMP can be

connected directly to VIN, or it can be connected

to VIN with a TVS diode.

Connecting VCLAMP to VIN is equivalent to

connecting a diode from each output to VIN. The

TVS diode allows the voltage on the output pins

to exceed VIN until the TVS diode breaks down.

This increased voltage allows the

current

through the load to decay faster, which is

generally required for high-speed operation with

unipolar stepper motors.

The

TVS diode’s breakdown voltage should be

selected such that the VCLAMP pin remains

below its maximum ratings. Note that the TVS

diode’s breakdown voltage may be higher than

expected as this voltage is rated at low currents.

For VIN supply voltages up to 24V, it is

recommended to use a 24V TVS diode. This

ensures that the VCLAMP pin voltage stays

within its limits.

PCB Layout Guidelines

Efficiency PCB layout is vital for stable operation.

For the best results, refer for Figure 5 and follow

the guidelines below:

1. Place the bypass capacitors near the IC.

2. If used, place the VCLAMP TVS diode near

the IC.

3. Place thermal vias under the exposed pad to

help move heat from the device to a plane on

an inner layer, or on the back side of the

PCB.

Figure 5: Recommended PCB Layout