Freescale Semiconductor, Inc.
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Order this document from Analog Marketing: MC34923/D
Rev 0, 05/2003
Preliminary Information
Full-Bridge PWM Motor Driver
Designed with Motorola’s advanced SMARTMOS, the 34923 is designed for
pulse-width modulated (PWM) current control of DC motors. It is capable of
continuous output currents up to 2.0 A and operating voltages of up to 45 V.
Internal fixed off-time PWM current-control timing circuitry can be programmed
via a serial interface to operate in slow, fast, and mixed current-decay modes.
DIR and PWM/ENABLE input pins are provided for use in controlling the
speed and direction of a DC motor with externally applied PWM-control
signals. The PWM/ENABLE input can be programmed via the serial port to
PWM the bridge in fast or slow current decay. Internal synchronous
rectification control circuitry is provided to reduce power dissipation during
PWM operation.
Internal circuit protection includes thermal shutdown with hysteresis and
crossover-current protection. A special power-up sequencing is not required.
Features
• ±2.0 A, 45 V Continuous Output Rating
• Low
R
DS(ON)
Outputs (270 m
Ω
, typical)
• Programmable Mixed, Fast, and Slow Current-Decay Modes
• Serial Interface Controls Chip Functions
• Synchronous Rectification for Low Power Dissipation
• Internal Undervoltage Lockout Thermal Shutdown Circuitry
• Crossover-Current Protection
34923
FULL-BRIDGE PWM MOTOR
DRIVER
Freescale Semiconductor, Inc...
DW SUFFIX
24-LEAD SOICW
CASE 751E-04
ORDERING INFORMATION
Device
MC34923DW/R2
Temperature
Range (T
A
)
-40 to 125°C
Package
24 SOICW
34923 Simplified Application Diagram
5.0 V
34923
≤
5.0 V
PWMMODE
DIR
DCMA
PWM/ENABLE
MCU
Serial
Port
CLOCK
DATA
STROBE
OSC
GND
DCMB
DC
Motor
This document contains information on a product under development.
Motorola reserves the right to change or discontinue this product without notice.
© Motorola, Inc. 2003
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≤
45 V
5.0 V
CP1
CP2
V
DD
Bandgap
V
DD
Thermal Shutdown
Undervoltage
and
Fault Detect
OSC
(160 kHz)
V
B
V
BB
Bandgap
Regulator
V
REG
Charge
Pump
Control Logic
PWMMODE
Direction
Enable
Sync. Rect.Control
Internal PWM Mode
External PWM Mode
DCMA
Gate
Drive
DCMB
SENSE
Zero
Current
Detect
Freescale Semiconductor, Inc...
DIR
PWM/ENABLE
Motor
C
S
R
S
OSC
Programmable
PWM Timer
Fixed-Off
Blank
Decay
Current
Sense
CLOCK
DATA
STROBE
SPAN
Serial Port
Sleep Mode
Reference
Buffer and
Divider
V
REF
Load Current
Reference
Figure 1. 34923 Simplified Block Diagram
34923
2
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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
Freescale Semiconductor, Inc.
.
V
B
CP2
CP1
DIR
OSC
GND
GND
V
DD
PWM/ENABLE
DATA
CLOCK
STROBE
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
REG
SPAN
NC
DCMB
V
BB
GND
GND
SENSE
DCMA
NC
PWMMODE
V
REF
PIN FUNCTION DESCRIPTION
Freescale Semiconductor, Inc...
Pin
1
2
3
4
5
6, 7, 18, 19
8
9
10
11
12
13
14
15, 22
16
17
20
21
23
24
Pin Name
V
B
CP2
CP1
DIR
OSC
GND
V
DD
PWM/ENABLE
DATA
CLOCK
STROBE
V
REF
PWMMODE
NC
DCMA
SENSE
V
BB
DCMB
SPAN
V
REG
Formal Name
Boost Voltage
Switching Capacitor 2
Switching Capacitor 1
Direction
Oscillator
Ground
Logic Voltage
H-Bridge Enable
Serial Data
Serial Data Clock
Serial Data Latch Strobe
Current Limit Reference
Voltage
PWM Mode Control
No Connect
H-Bridge Output A
Current Sense
H-Bridge Voltage Supply
H-Bridge Output B
Current Limit Reference Range
Bandgap Voltage
Boost voltage storage node.
Definition
Charge pump capacitor connection 2.
Charge pump capacitor connection 1.
Logic-level input for direction control.
Logic-level oscillator (square wave) input.
Ground.
Low voltage (typically 5.0 V) logic supply.
Logic-level input for enabling the H-bridge driver.
Logic-level input for serial interface.
Logic-level input for serial port (data is entered on rising edge).
Logic-level input for serial port (active on rising edge).
Load current reference input voltage.
Logic-level input for PWM mode control when in internal PWM mode.
No internal connection to this pin.
One of two bridge outputs to the motor.
Sense resistor.
High-current (20 V to 45 V) load supply.
One of two bridge outputs to the motor.
Logic-level input for V
REF
range control.
Bandgap decoupling capacitor.
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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34923
3
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MAXIMUM RATINGS
All voltages are with respect to ground unless otherwise noted.
Rating
Load Supply Voltage
Logic Supply Voltage
Input Voltage
Sense Voltage
Reference Voltage
Output Current (Note 1)
Storage Temperature
Symbol
V
BB
V
DD
V
IN
V
S
V
REF
I
OUT
T
S
T
A
T
J
P
D
Value
48
7.0
-0.3 to V
DD
+ 0.3
0.5
2.7
±2.0
-55 to 150
-20 to 85
-40 to 150
1.6 (Note 3)
Unit
V
V
V
V
V
A
°C
°C
°C
W
V
V
ESD1
V
ESD2
T
SOLDER
R
θ
JA
±2000
±200
260
56
°C
°C/W
Freescale Semiconductor, Inc...
Ambient Temperature
Operating Junction Temperature
Power Dissipation (T
A
= 25°C) (Note 2)
ESD Voltage
Human Body Model (Note 4)
Machine Model (Note 5)
Lead Soldering Temperature (Note 6)
Thermal Resistance Junction-to-Ambient (Note 2)
Notes
1. Output current rating may be limited by duty cycle, ambient temperature, and heatsinking. Under any set of conditions, do not exceed the
specified current rating or a junction temperature of 150°C.
2. Maximum power dissipation at indicated ambient temperature in free air with no heatsink used.
3. Per SEMI G42-88 specification.
4. ESD1 testing is performed in accordance with the Human Body Model (C
ZAP
= 100 pF, R
ZAP
= 1500
Ω).
5.
6.
ESD2 testing is performed in accordance with the Machine Model (C
ZAP
= 200 pF, R
ZAP
= 0
Ω).
Lead soldering temperature limit is for 10 seconds maximum duration. Not designed for immersion soldering. Exceeding these limits may
cause malfunction or permanent damage to the device.
34923
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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
Freescale Semiconductor, Inc.
STATIC ELECTRICAL CHARACTERISTICS
Characteristics noted under conditions T
A
=
25°C, V
BB
= 45 V, V
DD
= 5.0 V, V
SENSE
= 0.5 V, and f
PWM
< 50 kHz unless otherwise
noted.
Characteristic
Symbol
Min
Typ
Max
Unit
OUTPUT DRIVERS
Load Supply Voltage Range
Operating
During Sleep Mode
Output Leakage Current
V
OUT
= V
BB
V
OUT
= 0 V
I
DSS
–
–
R
DS(ON)
–
–
–
–
V
F
–
–
I
BB
–
–
–
4.0
2.0
–
7.0
5.0
20
mA
mA
1.2
1.2
1.6
1.6
300
–
300
–
450
700
450
700
V
<1.0
<-1.0
20
-20
m
Ω
V
BB
20
0
–
–
45
45
V
µ
A
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Output On Resistance
Source Driver, I
OUT
= -2.0 A @ 25°C
Source Driver, I
OUT
= -2.0 A @ 150°C
Sink Driver, I
OUT
= 2.0 A @ 25°C
Sink Driver, I
OUT
= 2.0 A @ 150°C
Body Diode Forward Voltage
Source Diode, I
F
= -2.0 A
Sink Diode, I
F
= 2.0 A
Load Supply Current
f
PWM
< 50 kHz
Charge Pump On, Outputs Disabled
Sleep Mode
µ
A
CONTROL LOGIC
Logic Supply Voltage Range (Operating)
Logic Input Voltage
V
IN(1)
V
IN(0)
Input Current
All Logic Inputs Except PWM/ENABLE
V
IN
= 2.0 V
V
IN
= 0.8 V
PWM/ENABLE Only
V
IN
= 2.0 V
V
IN
= 0.8 V
Input Hysteresis
All Digital Inputs Except OSC
OSC (Operating)
Reference Input Voltage Range (Operating)
Reference Input Current
V
REF
= 2.5 V
Input Offset Voltage
Comparator V
REF
= 0 V
Buffer
V
IO
–
–
0
0
±5.0
±15
I
IN(1)
I
IN(0)
–
–
40
16
100
40
mV
I
IN(1)
I
IN(0)
–
–
<1.0
<-2.0
20
-20
2.0
–
–
–
–
0.8
V
DD
4.5
5.0
5.5
V
V
µ
A
∆
V
IN(LOGIC)
∆
V
IN(OSC)
V
REF
I
REF
50
200
0
–
–
–
100
400
2.6
V
µ
A
–
–
±0.5
mV
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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34923
5
