FTM / Connectivity / Monolithic Power Systems — MP6615 Motor Driver IC

Monolithic Power Systems — MP6615 Motor Driver IC

Connectivity

November 9, 2023
Connectivity
Issue 8 2023

Integrated H-bridge IC simplifies design of motor driver circuits

MPQ6615 and MPQ6615-AEC1 ICs from Monolithic Power Systems provide a complete solution for driving motors operating from an input voltage up to 40 V, and with an output current up to 8 A.

The MP6615 from Monolithic Power Systems is an integrated H-bridge dc motor driver which implements a full bridge made up of four N-channel power MOSFETs. The motor driver also integrates pre-drivers, gate driver power supplies, and bidirectional current-sense amplifiers, enabling designers to reduce component count, simplify their board layout and save space.

The motor driver is also available in an AEC-Q100 grade 1 qualified version, with the part number MPQ6615-AEC1. Both parts operate over an input-voltage range of 4.75 V to 40 V.

The MP6615’s 11 mΩ MOSFETs supply a continuous output current of up to 8 A. An internal charge pump is used to supply the gate driver for the high-side MOSFETs. A trickle charge circuit maintains a sufficient voltage at the gate driver to operate at a 100% duty cycle.

Internal safety features include thermal shutdown, under-voltage lockout, and over-current protection.

The MP6615 is supplied in a 6 mm x 6 mm TQFN-26 package.

Features

Protection functions:
- Under-voltage lockout
- Over-voltage protection
- Over-current protection
- Thermal shutdown

Applications

Industrial equipment
Automotive systems:
- Brushed dc motors
- Door lock and latch motors
- Seat actuators

Development Kit

Part Number: EVQ6615-QK-00A

The EVQ6615-QK-00A is an H-bridge dc motor driver evaluation board featuring the MPQ6615-AEC1 IC, which operates from an input voltage of up to 40 V.

The H-bridge consists of four N-channel power MOSFETs. An internal charge pump generates the gate driver supply voltages for the high-side MOSFETs, and a trickle charge circuit maintains sufficient gate driver voltages for 100% duty cycle operation.

The current flowing through the two Sx outputs is sensed via the internal current-sensing circuits. Each phase has an Output pin which sources or sinks a current proportional to each phase’s output current. Only the current flowing through the low-side MOSFET is sensed. This current is sensed in both the forward and reverse directions.

Internal safety features include over-current protection, under-voltage lockout protection, and thermal shutdown. The input control signals for the MPQ6615-AEC1 are applied through the connector on the board.

The MPQ6615-AEC1 can be used to drive brushed dc motors, door lock and latch motors, and seat actuators.