MP6508
2.7V-to-18V, 1.2A, Bipolar Stepper Motor
Driver with Integrated MOSFETs
DESCRIPTION
FEATURES
The MP6508 is a bipolar stepper-motor driver
with dual, built-in full-bridges consisting of Nchannel power MOSFETs.
It operates from a supply voltage ranging from
2.7V to 18V and can deliver motor current up
to 1.2A per channel. The Internal safety
features include over-current protection(OCP),
under-voltage lockout protection(UVLO) and
thermal shutdown. A fault output flag is
available to indicate OCP and thermal
shutdown.
The MP6508 comes in both 16-pin,
5.0mmx6.4mm TSSOP-EP and 4mmx4mm
QFN package with an exposed thermal pad on
the backside.
Wide 2.7V to 18V Input Voltage Range
Two Internal Full Bridge Drivers
Low On Resistance(HS:250mΩ; LS:250mΩ)
Internal Charger Pump for the High-Side
Driver
Low Quiescent Current:1.6mA
Low Sleep Current: 1uA
Over-Current Protection
Thermal Shutdown and UVLO Protection
Fault Indication Output
Thermally-Enhanced Surface-Mount
Package
APPLICATIONS
POS Printers
Video Security Camera
Digital Still Cameras
Battery Powered Toys
All MPS parts are lead-free, halogen free, and adhere to the RoHS directive. For
MPS green status, please visit MPS website under Quality Assurance. “MPS”
and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
BST
VIN
BST
C2
0.1uF
VDD
C3
2.2uF
C3
2.2uF
VIN
C1
10uF
MP6508
AIN1
VIN
AOUT1
Motor
AIN2
AOUT2
BIN1
AOUT2
BIN1
SENA
BIN2
SENA
FAULT
BOUT1
BOUT2
ON OFF
BIN2
RSENA
nSLEEP
GND
Fault
FAULT
BOUT1
Motor
SENB
Stepper Motor Application
Motor
BOUT2
ON OFF
nSLEEP
GND
RSENB
MP6508 Rev.1.0
6/27/2017
RSENA
WindingA
WindingB
Fault
C1
10uF
MP6508
AIN1
AOUT1
AIN2
VIN
C2
0.1uF
VDD
SENB
RSENB
Dual DC Motor Application
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1
MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER
ORDERING INFORMATION
Part Number
MP6508GF*
MP6508GR**
Package
TSSOP-16 EP
QFN-16 (4mmx4mm)
Top Marking
See Belows
See Belows
* For Tape & Reel, add suffix –Z (e.g. MP6508GF–Z);
**For Tape & Reel, add suffix –Z (e.g. MP6508GR–Z);
TOP MARKING (MP6508GF)
MPS: MPS prefix;
YY: year code;
WW: week code:
MP6508: product code of MP6508GF;
LLLLLL: lot number;
TOP MARKING (MP6508GR)
MPS: MPS prefix;
Y: year code;
WW: week code:
MP6508: product code of MP6508GR;
LLLLLL: lot number;
MP6508 Rev.1.0
6/27/2017
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2
MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER
4
BOUT2
5
MP6508
13
GND
12
VIN
SENB
6
11
BST
BOUT1
7
10
BIN2
FAULT
8
9
BIN1
EXPOSED PAD ON
BACKSIDE
CONNECTED TO GND
AIN2
13
1
12
VDD
AOUT2
2
11
GND
BOUT2
3
10
VIN
SENB
4
9
BST
MP6508
EXPOSED PAD ON
BACKSIDE
CONNECTED TO GND
TSSOP-16 EP
8
AOUT2
SENA
BIN2
VDD
AIN1
14
14
3
7
SENA
BIN1
AIN2
nSLEEP
15
15
2
6
AOUT1
FAULT
AIN1
AOUT1
16
5
1
BOUT1
nSLEEP
16
PACKAGE REFERENCE
QFN-16 (4mm×4mm)
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance
Supply Voltage VIN ......................... -0.3V to 20V
AOUTx Voltage VAOUTx ...............-0.3V to VIN+1V
BOUTx Voltage VBOUTx ...............-0.3V to VIN+1V
BST Voltage VBST ....................-0.3V to VIN+6.5V
Sense Voltage VSENx ..................... -0.3V to 0.5V
All Other Pins ................................ -0.3V to 6.5V
Junction Temperature .............................. 150°C
Lead Temperature ................................... 260°C
(2)
Continuous Power Dissipation (TA = +25°C)
QFN-16 (4mm×4mm).................................2.7W
TSSOP-16 EP ...........................................2.8W
Operating Temperature.............. -40°C to +85°C
QFN-16(4mm×4mm) .............. 46 ...... 10 ... °C/W
TSSOP-16 EP ........................ 45 ...... 10 ... °C/W
Recommended Operating Conditions
(3)
(4)
θJA
θJC
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX)-TA)/θJA. Exceeding the maximum allowable power
dissipation will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
Supply Voltage VIN .......................... 2.7V to 18V
Output Current IA/BOUT..................................1.2A
Operating Junction Temp. (TJ). -40°C to +125°C
MP6508 Rev.1.0
6/27/2017
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3
MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER
ELECTRICAL CHARACTERISTICS
VIN=9V, TA=25°C, unless otherwise noted.
Parameter
Power Supply
Input Supply Voltage
Vdd Voltage
Quiescent Current
Symbol
Condition
VIN
Vdd
IIN
IIN_SLEEP
Min
Typ
Max
Units
18
V
V
1.8
mA
1
µA
250
350
mΩ
310
400
mΩ
2.7
4.85
nSLEEP=1, IOUT=0,
Output disable
nSLEEP=0, VIN=9V
1.6
Integrated MOSFETs
RHS
Output On Resistance
RLS
Body-Diode Forward
Voltage
Control Logic
UVLO Threshold (Rising)
UVLO Hysteresis
Input Logic ‘Low’ Threshold
Input Logic ‘High’ Threshold
nSLEEP Logic, Low
nSLEEP Logic, High
VF
VFAULT_L
Fault Output Leakage
Current
Constant Off Time
Propagation Delay Time
(On)
Propagation Delay Time
(Off)
ILEAK_FAULT
TOFF
TON_DELAY(HS)
TON_DELAY(LS)
TOFF_DELAY(HS)
TOFF_DELAY(LS)
350
mΩ
400
mΩ
235
350
mΩ
310
400
mΩ
310
mΩ
400
mΩ
IOUT=500mA
VIN_RISE
VHYS
VIL
VIH
VSLEEP_L
VSLEEP_H
Fault Output Logic, Low
MP6508 Rev.1.0
6/27/2017
IOUT=500mA, VIN=9V
TJ=25°C
IOUT=500mA, VIN=2.7V
TJ=25°C
IOUT=500mA, VIN=9V
TJ=85°C
IOUT=500mA, VIN=2.7V
TJ=85°C
IOUT=500mA, VIN=9V
TJ=25°C
IOUT=500mA, VIN=2.7V
TJ=25°C
IOUT=500mA, VIN=9V
TJ=85°C
IOUT=500mA, VIN=2.7V
TJ=85°C
30
75
1
V
2.5
120
0.6
V
mV
V
V
V
V
2
0.4
2
Flag triggered by OTP
1mA Current.
VFAULT=5V
10mA Source Current
21
100
20
135
80
26
200
55
180
130
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© 2017 MPS. All Rights Reserved.
200
mV
1
µA
31
300
90
225
180
µs
ns
ns
ns
ns
4
MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER
ELECTRICAL CHARACTERISTICS (continued)
VIN=9V, TA=25°C, unless otherwise noted.
Parameter
Symbol
Cross Over Delay
Sleep Mode Wakeup Time
Min
Typ
Max
Units
350
450
550
ns
275
355
435
ns
0.65
0.75
0.9
ms
ATT1=L, ATT2=L
175
204
233
mV
High Side
Low Side
2
2.2
1.8
2.5
3.4
2.4
3
4.6
3
µs
A
A
TDEG
0.75
1.1
1.45
µs
TOCP
1.3
1.8
2.3
ms
TCROSS
TWAKE
Condition
LS off to HS on for one bridge
arm
HS off to LS on for one bridge
arm
Sleep active high to full bridge
turn on (VBST=100nF)
Protection Circuitry
Current Limit Sense Trip
Voltage
Blanking Time
Over-Current Trip Level
Over-Current Deglitch Time
Over-Current Protection
Period
Thermal Shutdown
Thermal Shutdown
Hysteresis
MP6508 Rev.1.0
6/27/2017
VREF
TBLANK
IOCP1
IOCP2
165
°C
15
°C
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5
MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER
TYPICAL CHARACTERISTICS
MP6508 Rev.1.0
6/27/2017
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6
MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Performance waveforms are tested on the evaluation board of the Design Example section.
VIN=12V, IOUT=1.2A, FSTEP=200Hz, R+L Load: L=2mH, R=3.3Ω, TA=25°C, unless otherwise noted.
MP6508 Rev.1.0
6/27/2017
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7
MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER
PIN FUNCTIONS
QFN16
Pin #
TSSOP16
Pin #
Name
1
2
3
4
SENA
AOUT2
Channel A Sense. Connect to current sensor resistor for channel A.
Connect to motor winding A.
3
4
5
6
7
8
9
5
6
7
8
9
10
11
BOUT2
SENB
BOUT1
FAULT
BIN1
BIN2
BST
Connect to motor winding B.
Channel B Sense. Connect to current sensor resistor for channel B.
Connect to motor winding B.
Logic low when in over-temperature fault condition.
Gate signal input to control BOUT1.
Gate signal input to control BOUT2.
Charge Pump Output. Connect a 10nF-to-100nF ceramic capacitor to VIN
10
11
12
13
14
12
13
14
15
16
VIN
GND
VDD
AIN2
AIN1
15
1
nSLEEP
16
2
AOUT1
MP6508 Rev.1.0
6/27/2017
Description
Power Supply Input. Ranges from 2.7V to 18V.
Ground
Internal control and logic supply voltage.
Gate signal input to control AOUT2.
Gate signal input to control AOUT1.
Sleep Logic Input. Logic low for sleep mode and logic high to enable the
device
Connect to motor winding A
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8
MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER
BLOCK DIAGRAM
VIN
BST
VIN
VDD
Charge
Pump
MP6508
LDO
C3
2.2uF
C2
0.1uF
VIN
C1
10uF
AIN1
Gate Signal Input
AIN2
BIN1
BIN2
AOUT1
Gate
Driver
AOUT2
OCP
Control
Logic
VDD
10kΩ
Fault
OCP
VREF
SENA
VIN
RSENA
WindingA
Fault
Report
OCP
OFF ON
GND
BOUT1
OCP
BOUT2
VREF
SENB
WindingB
Gate
Driver
nSLEEP
Motor
RSENB
Figure 1: Function Block Diagram
MP6508 Rev.1.0
6/27/2017
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9
MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER
OPERATION
The MP6508 is a motor driver that integrates 8
N-channel power MOSFETs for dual, internal fullbridges with 1.2A output current capability over
an input voltage range of 2.7V to 18V. It can
drive a stepper motor, or two DC motors.
The motor output current can be either controlled
by an external pulse width modulator (PWM) or
internal PWM current controller.
The MP6508 includes the following fault
protections: over-current protection(OCP), undervoltage lockout(UVLO) and over-temperature
protection(OTP).
In external PWM control mode, the winding’s
inductive current ramps up when the high-side
MOSFET is on and freewheels during the highside MOSFET’s off time to cause the
recirculation current.
There are two modes for this recirculation current:
slow decay and fast decay, both of which are
shown in Figure 3 for forward operation and
Figure 4 for reverse operation.
VIN
It also provides a low-power sleep mode.
External PWM Current Control
The motor current can be regulated by applying
external PWM signals on the input pins AIN1,
AIN2, BIN1 and BIN2. For phase A, the AIN1 and
AIN2 input pins control the state of the AOUT1
and AOUT2; similarly for phase B, the BIN1 and
BIN2 input pins control the state of the BOUT1
and BOUT2.
AOUT2
AOUT1
Slow Decay
Fast Decay
Forward
VIN
Figure 3: Forward Operation
AIN1
VIN
AOUT1
Gate
Driver
AOUT2
WindingA
AIN2
Motor
VTRIP
SENA
RSENA
AOUT1
AOUT2
Figure 2: Full-Bridge Control Circuit
Figure 2 shows the input signal logic and bridge
output state.
Table 1: Full-Bridge Gate Logic
A/BIN1 A/BIN2
A/BOUT1
A/BOUT2
L
L
L
H
H
H
L
H
MP6508 Rev.1.0
6/27/2017
High
Impedance
GND
VIN
GND
High
Impedance
VIN
GND
GND
Slow Decay
Fast Decay
Reverse
Figure 4: Reverse Operation
For slow decay mode, the current circulates
through the two low-side MOSFETs. For fast
decay mode, the current flows through the body
diodes of the other diagonal two MOSFETS.
To configure the MP6508 for fast decay mode,
apply the PWM signal to one input pin and keep
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10
MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER
the other input pin low; for slow decay mode,
apply the PWM signal to one input pin and keep
the other input pin high. See Table 2 for more
configuration details and Figure 5 for detailed
waveforms.
Table 2: PWM Control
A/BIN1
H (PWM)
L (PWM)
L
L
H
H
L (PWM)
H (PWM)
A/BIN2
L
L
H (PWM)
L (PWM)
L (PWM)
H (PWM)
H
H
Mode
Forward
Fast Decay
Reverse
Fast Decay
Forward
Slow Decay
Reverse
Slow Decay
comparator
MOSFET.
shuts
off
the
high-side
The stepper motor’s inductance causes
the current to freewheel through the two
low-side MOSFETs (slow decay).
During this freewheeling time, the current
decreases until the internal clock reaches
its’ constant off time (typically 30µs). After
that, the high-side MOSFET is enabled to
increase the winding current again.
The cycle then repeats.
Calculate the current limit as:
ILIMIT
VREF
RSENSE
(1)
A/B IN1
A/B IN1
0
A/B IN2
0
0
A/B IN2
IA/BOUT1
0
ILIMIT
IA/BOUT1
0
0
Forward
Reverse
Fast Decay
Forward
Reverse
Forward
Slow Decay
Reverse
Slow Decay
TBLANK
Figure 5: External PWM Current Control Waveform
Internal PWM Current Control
For this control method, the motor current is
regulated by an internal constant off-time PWM
current control circuit as the following:
ILIMIT
Constant off time TOFF
Figure 6: Internal PWM Current Control Waveform
Initially, a diagonal pair of MOSFETs
turns on so current can flow through the
motor winding.
Sleep Mode
The current increases in the motor
winding, which is sensed by an external
sense resistor (RSENSE). During the initial
blanking time TBLANK (3us), the high-side
MOSFET always turns on in spite of
current limit detection.
Connect the nSLEEP pin to logic low to enable a
low-power sleep state. In this state, the two full
bridges are disabled and the internal circuits
such as the gate drive, internal regulator, and
When the voltage across RSENSE reaches
the internal reference voltage threshold
VTRIP (200mV), the internal current
MP6508 Rev.1.0
6/27/2017
The MP6508 provides low-power standby sleep
mode.
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11
MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER
charge pump all shut down. Connect the
nSLEEP pin to logic high to wake up the MP6508
from sleep mode, though there is a delay time of
~1ms until the internal circuitry stabilizes.
Blanking Time
There is usually a current spike during the
switching transition due to the body diode’s
reverse-recovery current or the distributed
inductance or capacitance. This current spike
requires filtering to prevent it from erroneously
shutting down the high-side MOSFET. An
internal blanking time TBLANK blanks the output of
the current sense comparator when the outputs
are switched, which is also the minimum on time
for high-side MOSFET.
Enable
If all the inputs (AIN1, AIN2, BIN1 and BIN2) are
logic low, the MP6508’s outputs are disabled
while the charger pump and internal regulator
remain active.
Synchronous Rectifier
The MP6508 enters a synchronous rectifier (SR)
mode during the constant off-time period when
the current limit threshold is exceeded, and the
load current freewheels in slow decay SR mode.
In slow decay mode, the current freewheels
through one low-side MOSFET and the body
diode of the other low-side MOSFET to short the
winding. The SR mode enables both two low-side
MOSFETs, which feature a lower voltage drop
and lower power dissipation during decay
operation.
MP6508 Rev.1.0
6/27/2017
Over-Current Protection
The over-current protection circuit limits the
current through the FET by disable the gate
driver. If the over-current limit threshold is
reached and lasts for longer than the overcurrent deglitch time, all MOSFETs in the Hbridge will be disabled and the nFAULT pin will
be driven low. The driver will remain disabled and
is reset to enable state after 2ms(typ). Please
note that only the H-bridge in which the OCP is
detected will be disabled while the other bridge
will operate normally.
Over-current conditions on both high and low
side devices; i.e., a short to ground, supply, or
across the motor winding will all result in an overcurrent shutdown. Note that over-current
protection does not use the current sense
circuitry used for PWM current control, and is
independent of the sense resistor value or VREF
voltage.
Thermal Shutdown
The junction temperature of the IC is internally
monitored. If the junction temperature exceeds
the threshold value (typically 165ºC), the
converter is shut down (the fault pin goes low)
and recoveries once the junction temperature
drops to about 150ºC (15ºC hysteresis).
UVLO protection
The MP6508 has UVLO protection. When the
VIN exceeds the UVLO rising threshold, the
MP6508 powers up. It shuts off when VIN drops
below the UVLO falling threshold.
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12
MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER
APPLICATION INFORMATION
(6)
Table 3 : Full-Step Drive Sequence
Sequence
1
2
3
4
(Full Step)
Driver Mode:
The MP6508 could be configured for both fullstep and half-step modes by sequentially
energizing the two windings.
Full-step drive energizes two winding phases at
any given time. The stator windings are
energized as per the sequence shown in Table 3.
There are a total of four steps for one cycle in the
——
————
——
sequence (5): AB A B A B A B .
Half-step energizes the stator windings as per
the sequence shown in Table 4. There are a total
——
——
——
of eight steps for one cycle: ABB A B A A
——
——
——
B B A B A.
A
+
B
+
+
+
——
+
A
+
——
+
B
+
(6)
Table 4 : Half-Step Drive Sequence
Sequence
1
2
3
4
5
6
7
(Half Step)
A
B
+
+
——
+
+
+
+
A
Figure 7 shows the operating waveforms for both
full and half step drives.
+
8
+
——
+
+
B
+
+
Note:
5) A means +VIN between AOUT1 and AOUT2 for winding A,
H
AIN1
—
while A means -VIN between AOUT1 and AOUT2. The same
applies to winding B.
L
H
6) “+” item is the selected winding voltage.
AIN2
L
H
BIN1
L
H
BIN2
L
AOUT1-OUT2+VIN
0
-V IN
+VIN
BOUT1-OUT2
0
-V IN
AB
AB
AB
Full Step
AB
AB
B
AB
A
AB
B
AB
A
AB
Half Step
Figure 7 Signal Logic Sequences for Full-Step and
Half-Step
MP6508 Rev.1.0
6/27/2017
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13
MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER
PACKAGE INFORMATION
QFN16 (4mm×4mm)
3.90
4.10
2.15
2.45
0.50
0.70
PIN 1 ID
MARKING
0.25
0.35
3.90
4.10
PIN 1 ID
INDEX AREA
13
PIN 1 ID
SEE DETAIL A
16
1
12
2.15
2.45
0.65
BSC
9
4
8
TOP VIEW
5
BOTTOM VIEW
PIN 1 ID OPTION A
0.45x45ºTYP.
PIN 1 ID OPTION B
R0.25 TYP.
0.80
1.00
0.20 REF
0.00
0.05
DETAIL A
SIDE VIEW
3.80
2.30
1.00
0.35
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH.
3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETER MAX.
4) JEDEC REFERENCE IS MO-220, VARIATION VGGC.
5) DRAWING IS NOT TO SCALE.
0.65
RECOMMENDED LAND PATTERN
MP6508 Rev.1.0
6/27/2017
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14
MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER
PACKAGE INFORMATION
TSSOP-16 EP
PIN 1 ID
TOP VIEW
RECOMMENDED LAND PATTERN
SEE DETAIL "A"
FRONT VIEW
SIDE VIEW
DETAIL "A"
NOTE:
BOTTOM VIEW
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) PACKAGE LENGTH DOES NOT INCLUDE MOLD
FLASH, PROTRUSION OR GATE BURR.
3) PACKAGE WITDH DOES NOT INCLUDE INTERLEAD
FLASH OR PROTRUSION.
4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER
FORMING) SHALL BE 0.10 MILLIMETERS MAX.
5) DRAWING CONFORMS TO JEDEC MO-153,
VARIATION ABT.
6) DRAWING IS NOT TO SCALE.
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
MP6508 Rev. 1.0
6/27/2017
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
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