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Ordering number : EN7946A
LB11946
Monolithic Digital IC
PWM Current Control
Stepping Motor Driver
http://onsemi.com
Overview
The LB11946 is a stepping motor driver IC that implements PWM current control bipolar drive with a fixed off time.
This IC features 15 current setting levels using a fixed VREF voltage and support for micro-stepping drive from 1-2
phase excitation drive to 4W1-2 phase excitation drive. This device is optimal for driving stepping motors such as
those used for carriage drive and paper feed in printers.
Features
• PWM current control (with a fixed off time)
• Logic input serial-parallel converter (allows 1-2, W1-2, 2W1-2, and 4W1-2 phase excitation drive)
• Current attenuation switching function (with slow decay, fast decay, and mixed decay modes)
• Built-in upper and lower side diodes
• Simultaneous on state prevention function (through current prevention)
• Noise canceller function
• Thermal shutdown circuit
• Shutoff on low logic system voltage circuit
• Low-power mode control pin
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Motor supply voltage
Peak output current
Continuous output current
Logic system supply voltage
Logic input voltage range
Emitter output voltage
Symbol
VBB
IO peak
IO max
VCC
VIN
VE
Allowable power dissipation
Operating temperature
Storage temperature
Pd max
Topr
Tstg
tw ≤ 20μS
Conditions
VCC = 5V specifications
VCC = 3.3V specifications
Independent IC
Ratings
50
1.2
1.0
7.0
-0.3 to VCC
1.0
0.5
3.0
-25 to +85
-55 to +150
Unit
V
A
A
V
V
V
V
W
°C
°C
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.
Semiconductor Components Industries, LLC, 2013
June, 2013
22509 MS 20090212-S00006 / N2206 / 73004TN(OT) No.7946-1/14

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AC Electrical Characteristics at VCC = 5V
Parameter
Symbol
Clock frequency
Data setup time
Data hold time
Minimum clock high-level pulse width
Minimum clock low-level pulse width
SET pin stipulated time
SET pin signal pulse width
Fclk
TDS
TDH
TSCH
TSCL
Tlat
Tlatw
LB11946
Conditions
CLK
DATA
Fclk
TSCH TSCL
TSD TDH
D4 D5
D6
SET
min
0.9
0.9
0.9
0.9
0.9
1.9
Ratings
typ
200
2.5
2.5
2.5
2.5
2.5
5.0
max
550
Unit
kHz
μS
μS
μS
μS
μS
μS
D10 D11
Tlat
Tlatw
No.7946-3/14


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Package Dimensions
unit : mm (typ)
3147C
28
R1.7
1
20.0
26.75
15
14
LB11946
(1.81)
1.78
0.6 1.0
SANYO : DIP28H(500mil)
Pin Assignment
Pd max -- Ta
3.5
Independent IC
3.0
2.0
2.0
1.5 1.56
1.0
0.5
0
-25 0
25 50 75 85 100
Ambient temperature, Ta -- °C
28 27 26 25 24 23 22 21 20 19 18 17 16 15
LB11946
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Note: The D-GNDA and D-GNDB pins are the anode sides of the lower side diodes
No.7946-6/14

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