Analog, Mixed-Signal and Power Management MC34933 1.4 A Dual H-Bridge Driver Compatible with 3 V Logic Target Applications Overview • Bipolar stepper motors/brushed DC motors The MC34933 is a monolithic dual H-bridge power IC ideal for portable electronic • SLR lens shutter control • Optical disc drive • Other portable electronics applications containing bipolar stepper motors and/or brush DC motors such as cameras and disk drive head positioning. The MC34933 operates from 2 V to 7 V using the internal charge pump with independent control of each H-bridge via parallel MCU interface. The device features built-in shoot-through current protection and an undervoltage shutdown function. The MC34933 has four operating modes for each channel: forward, reverse, brake and tristated (high impedance). The MC34933 has a low total RDS(on) of 1.0 Ω (Max) @ TA = 25 °C. The MC34933 efficiently drives many types of micro motors with low power dissipation owing to its low-output resistance and high-output slew rates. The H-bridge outputs are controlled with pulse width modulation (PWM) signals independently up to 200 kHz for speed/torque and current control. Simplified Application Drawing Freescale: A Leader in Analog Solutions Product Features and Benefits Features Function Benefits Dual H-bridges Parallel or independent operation Easy MCU interfacing to dual H-bridges Low total RDS(on) 1.0 Ω Typ Reduces conduction power loss in the switch, improving efficiency with which power is transferred to load Output current 400 mA continuous Low RDS(on) bridge maximizes current to a load Shoot-through current protection circuit Ensures that each pair of switches connected to power and ground are never fully on at the same time Avoids direct current from power rail through switches to ground Pulse width modulation Control input frequency up to 200 kHz Precise, high-frequency control over switch interface with real-world signals to control Low power consumption Low quiescent current Long battery life for portable applications and drive for complete embedded systems. Undervoltage detection and shutdown circuit If the supply voltage drops below a certain threshold, the output power stage switches to a tri-state condition Prevent erratic circuit operation Pb-free UQFN package EP suffix Environmentally preferred, low-profile package for portable designs Expanding on more than 30 years of innovation, Freescale is a leading provider of high-performance products that use SMARTMOS technology combining digital, power and standard analog functions. Freescale supplies analog and power management ICs that are advancing the automotive, consumer, industrial and networking markets. Analog solutions Performance Performance Typical values Number of channels 2 Maximum load output current, TA = 25 °C 1.0 A H-bridge operating voltage 2 to 7 V Logic operating voltage 2.7 to 5.5 V Input PWM max 200 kHz 16-PIN UQFN 98ASA00110D Documentation Freescale Document Number Title Description MC34933 Dual H-Bridge Driver with Charge Pump Data sheet SG1002 Analog Product Selector Guide Selector guide For more information, please visit freescale.com/analog Freescale and the Freescale logo are trademarks of Freescale Semiconductor, Inc., Reg. U.S. Pat. & Tm. Off. SMARTMOS is a trademark of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. © 2014 Freescale Semiconductor, Inc. Document Number: MC34933FS REV 2