Brushed DC motor driver with 3A continuous output
The Maxim Integrated MAX14870ETC+T is a fully integrated brushed DC motor driver that packs the control logic and power stage into a single 12-TDFN (3x3 mm) package. It drives one brushed DC motor using two internal half-bridges configured as an H-bridge, delivering up to 3A continuous output current. The supply and load voltage range spans 4.5V to 36V, covering common 12V and 24V industrial rails without needing a separate regulator. A PWM interface accepts logic-level control signals for speed and direction, and the Bi-CMOS process keeps switching losses low. The junction temperature range of -40°C to 150°C TJ suits engine-bay, factory-floor, and outdoor enclosure environments where ambient heat is a given.
3A output — sizing the load budget
The 3A continuous output rating is the headline number for BOM sizing. For a 12V brushed DC motor drawing 2A under load, this part runs with headroom. At 24V the same 3A limit applies, so a motor with 3A stall current will hit the ceiling — factor in the motor's locked-rotor current and the driver's peak capability (not listed here) when selecting. The two half-bridges each handle the full 3A, so the H-bridge total is 3A continuous, not 6A.
Supply voltage range: 4.5V to 36V
The single supply pin powers both the logic and the motor drive, simplifying the power tree. The 4.5V to 36V range means the same part works on a 5V logic rail, a 12V automotive battery (with transients), or a 24V industrial bus. No external buck or boost needed as long as the supply stays within that window. The lower end at 4.5V leaves margin for a 5V rail that droops under load.
Package and thermal management
The 12-WFDFN with exposed pad (3x3 mm) is the only package option. The exposed pad must be soldered to a PCB copper plane for thermal dissipation — without it, the junction temperature rises quickly above 3A continuous. The -40°C to 150°C TJ rating means the die can run hot, but the board layout determines whether it actually stays within that limit.
Lifecycle and compliance
ROHS3 compliant, so it passes EU material restrictions without exemption paperwork. For a BOM line, this means no immediate obsolescence risk and standard lead times through franchised distribution.