D0512HK 20080624-S00002,B8-5952/D2706 MS IM/93004 JO IM No.7232-1/8

http://onsemi.com

Semiconductor Components Industries, LLC, 2013

June, 2013

LB1940T

LB1940U

Overview

The LB1940T and LB1940U are 2-phase exciter type bipolar stepper motor driver ICs that feature low-voltage,

(supporting 3V battery) and low current operation with low saturation voltage. These ICs enable constant-current

control of actuators, and are optimal for driving the actuators of PC peripherals such as USB compatible scanners,

FDDs, and printers, as well as for controlling the shutter, iris, and AF of a digital still camera.

Features

• Low-voltage driving

2-power source type:

VS = 1.6 to 7.5V, VDD = 1.9 to 6.5V

Single power source type: VS = VDD = 1.9 to 7.5V

• Low saturation output:

VO(sat) = 0.3V at IO of 200mA

• Constant-current control

• Built-in reference voltage (Vref = 0.9V)

• Small-sized, low-profile package (LB1940T: TSSOP20; 225mil; thickness (t) = 1.2mm max.)

(LB1940U: MSOP20; thickness (t) = 0.85mm max.)

Specifications

Absolute Maximum Ratings

at Ta = 25

°C

Parameter

Symbol

Conditions

Ratings

Unit

Maximum supply voltage

VB max

VS1, VS2, VDD

-0.3 to +10.5

V

Output applied voltage

VOUT max

OUT1, OUT2, OUT3, OUT4

-0.3 to +10.5

V

Output Current

IO max

400

mA

Input applied voltage

VIN max

ENA1, ENA2, IN1, IN2, VC

-0.3 to +10.5

V

Allowable power dissipation

Pd max

Mounted on a specified board *

800

mW

Operating temperature

Topr

-20 to +85

°C

Storage temperature

Tstg

-55 to +150

°C

* Mounted on a Specified board: 114.3mm

×76.1mm×1.6mm, glass epoxy

Ordering number : EN7232B

Monolithic Digital IC

2-ch H-Bridge Constant Current Driver

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.