Drive H-bridge power switches from 2.5-V devices

Drive H-bridge power switches from 2.5-V devices

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By eeNews Europe

TC78H630FNG has a single H-bridge with a 2.1A rating and an on-resistance of 0.4Ω (upper + lower, typ.) in the output stage allowing the IC to deliver a large current drive for DC brushed motors. The TC78H630FNG supports short brake mode.


TC78H621FNG and TC78H611FNG have two H-bridges with 1.1A ratings, and are suitable for driving bipolar stepping motors with full-step controllability on three ports or half-step on four ports. The devices have an on-resistance of 0.8Ω (upper + lower, typ.) in the output stage. The TC78H621FNG can also drive a single DC brushed motor, while the TC78H611FNG can drive two and supports short brake mode.


These products are suitable for applications including mobile devices (point-of-sale devices) with a 3.7V lithium-ion battery, home appliances with a 5V or 12V power supply (refrigerators, air outlet ports in air-conditioner and ventilation), and residential and facility equipment (smart meters, water supply valves and electronic locks). The maximum output voltage is 18V. All are housed in a TSSOP16 package and include multiple safety features, such as overcurrent detection, thermal shutdown, under voltage lockout and shoot-through current protection. They require a logic power supply in the range 2.7 to 5.5V and can accept motor drive voltages in the range 2.5 to 15V. In standby mode the current consumption is approximately 1 μA (max.)




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