Freescale Semiconductor
Advance Information
Document Number: MC34920
Rev. 2.0, 1/2007
2.8
Ω
(Typ) Quad H-Bridge
Motor Driver
The 34920 is a multifunctional analog ASIC. The 34920 integrates
two circuits, four H-bridge drivers, a reset circuit in a single IC, and
two DC/DC switching voltage regulators. Input voltage is 21 V to 42
V DC.
Each motor of the two driver blocks can be configured as either a
DC motor driver with pulse width modulation (PWM)-control or a
single bipolar step motor driver. In step motor mode, both drivers are
capable of being operated in the quarter step mode.
In DC motor mode, both bridges in a driver are in parallel, providing
2.4 A of drive current. In step motor mode, each bridge in a driver
drives one phase. Each phase is driven with a bipolar current mode
drive.
Features
• Individual Thermal Limit Protection
• User-Selectable Motors: 2 DC Motors (2.4 A / Motor), 2 Step
Motors (W1-2 Phase Control), 1 DC Motor and 1 Step Motor
• 2 Buck Regulators (Switching @ 200 kHz)
• V
V2
Output Voltage Is Programmable to 10 V to 15 V DC
(Externally Set)
• Low-Voltage Detection Reset (V
V1
and V
VB+
)
• Pb-Free Packaging Designated by Suffix Code EI
VVB+
VV1
+
34920
H-BRIDGE MOTOR DRIVERS
FN SUFFIX
EI SUFFIX (PB-FREE)
98ASB42598B
44-PIN PLCC
ORDERING INFORMATION
Device
MC34920FN/R2
MC34920EI/R2
Temperature
Range (T
A
)
-40°C to 125°C
Package
44 PLCC
VV2
+
34920
V1_FB
VB+
V1_SWITCH
V2_SWITCH
V2_FB
DR1A
DC
MOTOR
MCU
RESET
SDI
SCLK
CS
DR2A
DR1B
DC
MOTOR
DR1PWM
DR2PWM
GND
CP1
CP2
VB
DR2B
VVB+
+
Figure 1. 34920 Simplified Application Diagram
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2007. All rights reserved.
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
