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Analog Devices MAX22211 Dual H-Bridge offers a dual 36V, 3.8AMAX H-bridge intended to drive two brushed DC motors or a single stepper motor. The H-bridge FETs have very low impedance, enabling high driving efficiency and low heat generation. The typical total RON (high-side + low-side) is 0.25Ω, and each H-bridge can be individually pulse-width modulation (PWM)-controlled employing three logic inputs (DIN1, DIN2, EN).
The ADI MAX22211 provides an accurate current drive regulation (CDR), limiting the start-up current of a brushed DC motor or controlling the phase current for stepper operation. The bridge output current is sensed by a non-dissipative integrated current sensing (ICS). Then, the current is compared with a configurable threshold (ITRIP). When the bridge current surpasses the ITRIP threshold, the MAX22211 implements the decay for a fixed OFF-time (tOFF). Four different Decay methods are featured (Slow Decay, Fast Decay, and two Mixed Decay modes). The non-dissipative ICS eliminates bulky external power resistors, which are generally required for this function, allowing a dramatic space and power saving compared with mainstream applications using external sense resistors.
The MAX22211 is housed in a small 5mm x 5mm TQFN32 package or a 4.4mm x 9.7mm TSSOP28 package.
