LV8714TA Datasheet, PDF (1/25 Pages) ON Semiconductor – Dual Stepper Motor Driver

LV8714TA
Dual Stepper Motor Driver with
Ultra-small Micro Steps
The LV8714 is a fully integrated dual bipolar/unipolar stepper motor driver with
ultra-small micro step drive capability. Alternatively, it can be used to drive four
DC motors independently. The device includes low R_DS(ON) (upper + lower =
0.9Ω) type MOSFETs based quad H-bridges with gate drivers and can drive up
to 1.5A per H-bridge. Synchronous rectification control is implemented for all
H-bridges to lower power dissipation during a MOSFET switching. The device
implements constant-current control using PWM at 125 kHz (typ.) switching
frequency that enables the least noise motor drive solution. A built-in linear
regulator powers internal logic circuit directly from the motor supply voltage,
V_M, thus eliminating need for any external regulator.
A proprietary internal current sensing mechanism is implemented that
eliminates up to four external current sense power resistors and improves the
system energy efficiency significantly. External V_REF input signal for each
H-bridge controls the drive step size and can achieve over 256 micro step
resolution. Individual controls signals (ENAx and INx) are provided for
controlling each H-bridge channel independently with forward and reverse
direction control. To enhance energy efficiency further, the device can be put
into a power saving standby mode, when idle.
Features
 Integrated quad H-bridges with independent controls
o Dual bipolar/unipolar stepper motor or quad DC motor drive
o Forward and reverse direction control
 Low R_DS(ON) (upper + lower = 0.9Ω) type MOSFETs
 Proprietary internal current sensing
o Eliminates up to four external current sense power resistors
 Over 256 micro step resolution with external V_REF inputs
 Single supply operation with a built-in internal regulator
 No external component for driving internal MOSFETs
 Constant-current control with 125 kHz (typ.) PWM switching frequency
 Low power standby mode when idle
 Synchronous rectification to reduce power dissipation
 In-built system protection features such as:
o Under-voltage
o Over-current
o Over-temperature
Typical Applications
 Surveillance Camera
 Stage light
 Scanner
 Printer
www.onsemi.com
48-pin TQFP with exposed pad
7 mm x 7 mm
MARKING DIAGRAM
XXXXXXXXXX
XXXXXXXXXX
AWLYYWWG
1
XXXXX = Specific Device Code
A
= Assembly Location
WL = Wafer Lot
YY
= Year
WW = Work Week
G
= Pb−Free Package
ORDERING INFORMATION
Ordering Code:
LV8714TA-NH
Package
TQFP48 EP
(Pb-Free / Halogen Free)
Shipping (Qty / packing)
1000 / Tape & Reel
© Semiconductor Components Industries, LLC, 2014
1
November 2014- Rev. 2
Publication Order Number:
LV8714TA/D