Ordering number : EN7231 LB1937T Monolithic Digital IC 1-2 Phase Excitation Stepping Motor Driver http://onsemi.com Overview The LB1937T is a 2-phase bipolar drive stepping motor driver IC that supports low-voltage drive and can drive two stepping motors at the same time. The LB1937T's miniature package and minimal number of external components reduces the required mounting area. It also provides high-efficiency motor drive and can reduce circuit current consumption. Since it provides a current detection pin and supports PWM control input, it can be used to implement current chopper control at the system level. The LB1937T is optimal for the stepping motors used for lens drive in digital cameras, printers, and movie cameras. Functions and Features • Low saturation voltage forward/reverse motor driver (VO sat = 0.3V at IO = 200mA) • Four H-bridge channels • Wide usable voltage range (Allowable voltage range: 2.5V to 9.5V, absolute maximum rating: 10.5V) • Supports PWM input (Low power consumption can be achieved in slow delay mode that uses IN1/IN2 = H/H logic.) • Motor (coil) current detection pin • Built-in thermal shutdown circuit • Thin form factor miniature package (TSSOP24) Semiconductor Components Industries, LLC, 2013 June, 2013 32207 TI PC B8-5899,7386 No.7231-1/7 LB1937T Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Maximum output voltage Input voltage Ground pin source current Allowable power dissipation Symbol Conditions Ratings Unit VCC max -0.3 to +10.5 VS max -0.3 to +10.5 V VS+ VSF V VOUT max VIN max IGND max Pd max -0.3 to +8.0 Per channel When mounted on a circuit board * V V 800 mA 1100 mW Operating temperature Topr -30 to +85 °C Storage temperature Tstg -40 to +150 °C * Specified circuit board : 114.3 × 76.1 × 1.6mm3, glass epoxy Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. Allowable Operating Range at Ta = 25°C Parameter Supply voltage Symbol Conditions Ratings Unit VCC 2.5 to 9.5 VS 2.5 to 9.5 V High-level input voltage VIH 2.0 to 7.5 V Low-level input voltage VIL -0.3 to 0.7 V Electrical Characteristics at Ta = 25°C, VCC = VS = 5V Parameter VCC system power supply current VS system power supply current Output saturation voltage Input current Symbol ICC0 Conditions IN1 to IN8 = 0V Ratings min typ Unit max 0.1 5 μA 16 mA ICC1 IN1 = IN3 = 3V 10 IS0 IN1 to IN8 = 0V 0.1 5 μA IS1 IN1 = IN3 = 3V 13 19 mA VOUT1 VCC = VS = 3V to 7.5V, VIN = 3V or 0V, IOUT = 200mA (High and low side) 0.3 0.4 V VOUT2 VCC = VS = 4V to 7.5V, VIN = 3V or 0V, IOUT = 400mA (High and low side) 0.6 0.8 V VIN = 5V 150 200 μA 30 μA 1.7 V IIN Spark killer diode Reverse current IS(leak) Forward voltage VSF IOUT = 400mA No.7231-2/7 LB1937T Package Dimensions unit:mm (typ) 3260A Allowable power dissipation, Pd max – mW Pd max – Ta 6.5 0.5 6.4 13 4.4 24 12 1 0.5 0.15 0.22 1.2max (1.0) (0.5) 1200 1100 Mounted on the specified circuit board 1000 800 572.00 600 400 200 Specified circuit board : 114.3 × 76.1 × 1.6mm3 glass epoxy board 0 -40 -30 -20 0 20 40 60 80 100 0.08 Ambient temperature, Ta – °C SANYO : TSSOP24(225mil) Pin Assignment VS 1 24 P-GND V CC 2 23 (NC) IN1 3 22 OUT1 IN2 4 21 OUT2 IN3 5 20 OUT3 IN4 6 19 OUT4 S -GND 7 18 P-GND IN5 8 17 IN6 9 16 OUT6 IN7 10 15 OUT7 IN8 11 14 OUT8 VS 12 13 P-GND LB1937T OUT5 Top view No.7231-3/7 LB1937T Block Diagram VCC 10μF VS 30kΩ OUT1 IN1 Stepping Motor 10μF 30kΩ OUT2 IN2 30kΩ 30kΩ 30kΩ IN3 30kΩ OUT3 30kΩ 30kΩ IN5 30kΩ OUT4 Control block IN4 30kΩ VS OUT5 IN6 30kΩ Stepping Motor 30kΩ OUT6 30kΩ IN7 IN8 30kΩ 30kΩ Thermal shutdown 30kΩ OUT7 OUT8 S-GND P-GND LB1937T P-GND Top view No.7231-4/7 LB1937T Truth Table Input IN1 IN2 L IN3 IN4 IN5 Output IN6 IN7 IN8 OUT3 OUT4 Output OUT5 OUT6 OUT7 OUT8 mode OUT1 OUT2 L off off (1) L H L H (2) H L H L (3) H H off H (4) (*) (*) H off (4)′ L L off off (5) L H L H (6) H L H L (7) H H off H (8) (*) (*) H off (8)′ L L off off (11) L H L H (12) H L H L (13) H H off H (14) (*) (*) H off (14)′ L L off off (15) L H L H (16) H L H L (17) H H off H (18) (*) (*) H off (18)′ L : low, H : high *: The output logic mode when IN1/IN2 = H/H is determined by the immediately preceding IN1/IN2 mode. The post-switching output modes will be as follows. When switching from (2): (4) When switching from (3): (4)' When switching from (1): Undefined (Either (4) or (4)') The modes when IN3/IN4 = H/H operate similarly as described below. When switching from (6): (8) When switching from (7): (8)' When switching from (5): Undefined (Either (8) or (8)') No.7231-5/7 LB1937T ICC -- VCC 15 10 5 0 0 1 2 3 4 5 IS -- VS 20 Supply current, IS – mA Supply current, ICC – mA 20 6 7 8 9 15 10 5 0 10 0 1 2 3 Supply voltage, VCC – V IIN -- VIN 200 150 8 1 to IN IN 100 50 0 0 1 2 3 5 6 7 8 8 9 10 e ow dl gh Hi 0.25 100 0 sid an 200 300 400 500 IS -- Ta 15.0 12.5 Supply current, Is – mA 15 10 5 10.0 7.5 5.0 2.5 -40 -20 0 20 40 60 80 100 120 140 Ambient temperature, Ta – °C Output saturation voltage, VO(sat) – V 7 Output current, IO – mA 20 0 6 0.50 0 9 ICC -- Ta 25 Supply current, ICC – mA 4 Input voltage, VIN – V 5 VO(sat) -- IO 0.75 Output saturation voltage, VO(sat) – V Input current, IIN – μA 250 4 Supply voltage, VS – V -40 -20 0 20 40 60 80 100 120 140 Ambient temperature, Ta – °C VO(sat) -- Ta 0.7 0 High and low side 0.6 0.5 0.4 0.3 0.2 -40 -20 0 20 40 60 80 100 120 140 Ambient temperature, Ta – °C No.7231-6/7 LB1937T ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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