LB1657M

The LB1657M is a dual bridge driver IC suited for apply in 2-phase bipolar stepping motor driver for FDD(3 to 5.25 in- ches)head actuator. The maximun driver current*volatage is 0.33A*12V/bridge.

The LB1657M has the following features:(1)power save function;(2)1.2direction inputs are used to make driver ou -tput selection;(3)low saturation voltage;(4)low current dissipation;(5)direction controllable from MPU due to low in-put current;(6)input level:TTL,LSTTL,5VCMOS compatible;(7) on-chip thermal shutdown(TSD) circuit.

LB1657M also has some outstanding absolute maximun ratings(Ta=25°C) and electrical characteristics(Ta=25°C,VCC=5V, Vs2=5V,Vs1=12V).Absolute maximun ratings:(1): logical selection supply voltage is 7 V;(2):seeking supply voltage is 15 V;(3):input voltage is 0 to VCC V;(4)peak seeking current is 500 mA;(5)continous seeking current is 330 mA;(6) :allowable power dissipation is 0.9 W;(7)operating temperature is -20 to +70;(8):storage temperature is -55 to +125.electrical characteristics:(1):input low level voltage is 0.8 V max;(2):input high level voltage is 2.0 V min;(3)input low level current is -10 uA min and +10 uA max when VI is 0.8 V;(4)input high level curernt is 6 uA typ and 10 uA max when VI is  2 V and VI is 5V;(5):current dissipation is 25 mA typ and 33 mA max when STB is 0.8 V.(6):output transistor voltage is 18 V min when IC is 10 mA;(7)Vs1 saturation voltage is 1.5 V typ and 2.2 V max wh-en SB is 0.8 V and IO is 330 mA;(8)clamp voltage is 3 V when IF is 330 mA upper.