I promise that you will be very interested in new TOSHIBA chip -THB6064AH.

Single-chip bipolar sinusoidal micro-step stepping motor driver
Uses high withstand voltage BICD process: Ron (upper + lower) 0.4 (typ.)
Forward and reverse rotation control available
Selectable phase drive (1/2, 1/8, 1/10, 1/16, 1/20, 1/32, 1/40, 1/64 step)
Output monitor pins (DOWN / ALERT)
Equipped with reset and enable pins
Built-in thermal shutdown(TSD) and over-current detection(ISD) circuit

Parameter
High output withstand voltage: VDSS 50 V
High output current: Iout 4.5 A (peak)
Packages: HZIP25-P-1.27
Dementions:3.6*1.4*0.5 cm
Weight:9.86g

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