MP6606

– 60V, 8-CHANNEL LOW-SIDE DRIVER WITH SERIAL INTERFACE

MP6606 Rev. 1.0

MonolithicPower.com

12

3/11/2022

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APPLICATION INFORMATION

Selecting the External Components

The MP6606 requires a 100nF, X7R ceramic

bypass capacitor at the VIN pin. In addition,

place a larger-value ceramic capacitor (4.7µF at

minimum) nearby. Additional capacitance may

be recommended. For example, if the device is

located far away from the other capacitors

located at VIN, it is recommended to place an

electrolytic bulk capacitor at the input power

supply side.

The VCLAMP pin dissipates the energy in an

inductive load when the current is turned off.

Depending on the application, VCLAMP can be

connected directly to VIN, or to a TVS diode

that is also connected to VIN.

Connecting VCLAMP to VIN is equivalent to

connecting a diode from each output to VIN. A

TVS diode allows the voltage on the output pins

to rise above VIN until the TVS diode breaks

down. This increased voltage allows the current

through the load to decay faster. This is

typically recommended for applications with

high-speed operation using unipolar stepper

motors.

Select the TVS diode’s breakdown voltage such

that

the VCLAMP

pin

remains below

its

maximum ratings. Note that TVS breakdown

voltage may be higher than expected, as this

value is rated for lower currents.

For VIN supply voltages of up to 24V, a 24V

TVS diode is recommended. That ensures that

the VCLAMP pin voltage stays within its limits.

PCB Layout Guidelines

PCB layout is vital for stable operation. For the

best results, follow the guidelines below and

refer to Figure 5:

1. Place the bypass capacitors near the IC

2. Place the VCLAMP TVS diode (if used)

near the IC.

3. Place thermal vias under the exposed pad

to help dissipate heat from the device to a

plane either on the inner layer or on the

back side of the PCB.

Figure 5: Recommended PCB Layout