MP6601
35V, 2.5A, Stepper Motor Driver
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP6601 is a stepper motor driver with
parallel inputs and current regulation. Current
sensing is internal and requires no external
sense resistors. High integration and a small
package size make the MP6601 a space-saving
and cost-effective solution for bipolar stepper
motor drives.
The MP6601 operates from a wide supply
voltage of 4.5 - 35V and can deliver motor
current up to 2.5A (depending on thermal
conditions and the package). The MP6601 can
operate a bipolar stepper motor in full-, half-, or
quarter-step modes using internal 2-bit DACs.
Full protection features include over-current
protection (OCP), input over-voltage protection
(OVP), under-voltage lockout (UVLO), and
thermal shutdown.
The MP6601 is available in QFN-24
(5mmx5mm) and TSSOP-28 EP packages.
Wide 4.5V to 35V Input Voltage Range
Two Internal Full-Bridge Drivers
Internal Current Sensing and Regulation
Low On Resistance (HS: 170mΩ, LS:
150mΩ)
No Control Power Supply Required
Simple PHASE/I0/I1 Logic Interface
3.3V and 5V Compatible Logic Supply
Step Modes from Full-Step to Quarter-Step
2.5A Output Current
Automatic Current Decay
Over-Current Protection (OCP)
Input Over-Voltage Protection (OVP)
Function
Thermal Shutdown and Under-Voltage
Lockout (UVLO) Protection
Fault Indication Output
Available in QFN-24 (5mmx5mm) and
Thermally
Enhanced
TSSOP-28
EP
Packages
APPLICATIONS
Bipolar Stepper Motors
Printers
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For
MPS green status, please visit the MPS website under Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
MP6601 Rev. 1.01
9/4/2018
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1
MP6601 – 35V, 2.5A, STEPPER MOTOR DRIVER W/ INTERNAL CURRENT SENSE
ORDERING INFORMATION
Part Number*
MP6601GU
MP6601GF
Package
QFN-24 (5mmx5mm)
TSSOP-28 EP
Top Marking
See Below
See Below
* For Tape & Reel, add suffix –Z (e.g.: MP6601GU–Z)
TOP MARKING (MP6601GU)
MPS: MPS prefix
YY: Year code
WW: Week code
MP6601: Product code of MP6601GU
LLLLLLL: Lot number
TOP MARKING (MP6601GF)
MPS: MPS prefix
YY: Year code
WW: Week code
MP6601: Product code of MP6601GF
LLLLLLLLL: Lot number
PACKAGE REFERENCE
MP6601 Rev. 1.01
9/4/2018
TOP VIEW
TOP VIEW
QFN-24 (5mmx5mm)
TSSOP-28 EP
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2
MP6601 – 35V, 2.5A, STEPPER MOTOR DRIVER W/ INTERNAL CURRENT SENSE
ABSOLUTE MAXIMUM RATINGS
(1)
Supply voltage (VIN) ........................ -0.3V to 40V
xOUTx voltage (VA/BOUT1/2) .............. -0.7V to 40V
VCP, CPB ................................. VIN to VIN + 6.5V
ESD rating (HBD).......................................... 2kV
All other pins to AGND ................... -0.3V to 6.5V
Continuous power dissipation (TA = +25°C) (2)
QFN-24 (5mmx5mm) .................................. 3.5W
TSSOP-24 EP ............................................. 3.9W
Storage temperature .................-55°C to +150°C
Junction temperature .............................. +150°C
Lead temperature (solder) ...................... +260°C
Recommended Operating Conditions (3)
Supply voltage (VIN) ......................... 4.5V to 35V
Operating junction temp. (TJ). ...-40°C to +125°C
MP6601 Rev. 1.01
9/4/2018
θJA
θJC
Thermal Resistance (4)
QFN-24 (5mmx5mm) ............. 36 ....... 8 .... °C/W
TSSOP-28 EP ........................ 32 ....... 6 .... °C/W
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 produces an excessive die temperature, causing
the regulator to 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.
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MP6601 – 35V, 2.5A, STEPPER MOTOR DRIVER W/ INTERNAL CURRENT SENSE
ELECTRICAL CHARACTERISTICS
VIN = 24V, TA = +25°C, unless otherwise noted.
Parameter
Power Supply
Input supply voltage
Quiescent current
Symbol
Condition
VIN
IQ
ISLEEP
Min
Typ
Max
Units
4.5
24
35
V
1.5
5
mA
1
µA
0.23
Ω
VIN = 24V, nSLEEP = 1,
with no load
VIN = 24V, nSLEEP = 0
Internal MOSFETs
RHS
Output on resistance
RLS
Body diode forward voltage
Control Logic
Input logic low threshold
Input logic high threshold
VF
VIN = 24V, IOUT = 1A,
TJ = 25°C
VIN = 24V, IOUT = 1A,
TJ = 85°C (5)
VIN = 24V, IOUT = 1A,
TJ = 25°C
VIN = 24V, IOUT = 1A,
TJ = 85°C (5)
IOUT = 1.5A
VIL
VIH
IIN(H)
VIH = 5V
Logic input current
IIN(L)
VIL = 0.8V
RPD
Internal pull-down resistance
Home nFAULT Outputs (Open-Drain Outputs)
Output low voltage
IO = 5mA
VOL
Output high leakage current
IOH
VO = 3.3V
Protection Circuit
VIN_RISE
UVLO rising threshold
VHYS
UVLO hysteresis
Input OVP threshold
VOVP
Input OVP hysteresis
∆VOVP
IOCP1
Sinking
Over-current trip level
IOCP2
Sourcing
tOCP
Over-current deglitch time (5)
Thermal shutdown (5)
Thermal shutdown hysteresis
(5)
Current Control
Constant off time
Blanking time (5)
Peak current regulation level
ISET voltage
ISET current ratio
Current trip accuracy
0.195
0.25
0.17
Ω
0.22
0.25
Ω
1.1
V
0.8
V
V
µA
µA
kΩ
2.1
20
5
500
36
3
3
3.4
300
37.5
1900
6
6
1
Ω
0.5
1
V
µA
4.5
V
mV
V
mV
A
A
µs
38.5
8
8
TTSD
165
°C
∆TTSD
15
°C
tOFF
tBLANK
Rt = 200kΩ
IPEAK
VISET
AISET
RISET = 71kΩ
0.95
IISET/IOUT
RISET = 71kΩ, 71 - 100%
RISET = 71kΩ, 38 - 67%
11
-5
-10
∆ITRIP
20
23
2
1.0
0.9
26
1.05
12.676
14
5
10
µs
µs
A
V
µA/A
%
%
NOTE:
5) Guaranteed by design.
MP6601 Rev. 1.01
9/4/2018
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4
MP6601 – 35V, 2.5A, STEPPER MOTOR DRIVER W/ INTERNAL CURRENT SENSE
TYPICAL CHARACTERISTICS
ISET Voltage vs. Temperature
ISET Current Ratio vs. Temperature
12.8
ISET CURRENT RATIO (μA/A)
ISET VOLTAGE (V)
0.93
0.92
0.91
0.9
0.89
0.88
-50
-20
10
40
70
100
TEMPERATURE (°C)
130
12.78
12.76
12.74
12.72
12.7
-50
260
260
ON RESISTANCE (mΩ)
ON RESISTANCE (mΩ)
280
240
220
200
180
160
140
10
40
70
100
TEMPERATURE (°C)
70
100
130
240
220
200
180
160
140
130
-50
-20
10
40
70
100
TEMPERATURE (°C)
130
Bridge B LS On Resistance vs.
Temperature
Bridge A LS On Resistance vs.
Temperature
250
250
230
230
ON RESISTANCE (mΩ)
ON RESISTANCE (mΩ)
40
Bridge B HS On Resistance vs.
Temperature
280
-20
10
TEMPERATURE (°C)
Bridge A HS On Resistance vs.
Temperature
-50
-20
210
190
170
150
210
190
170
150
130
130
-50
MP6601 Rev. 1.01
9/4/2018
-20
10
40
70
100
TEMPERATURE (°C)
130
-50
-20
10
40
70
100
130
TEMPERATURE (°C)
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MP6601 – 35V, 2.5A, STEPPER MOTOR DRIVER W/ INTERNAL CURRENT SENSE
TYPICAL CHARACTERISTICS (continued)
INPUT OVP THRESHOLD (V)
Input OVP Threshold vs.
Temperature
37.5
37.45
37.4
37.35
37.3
37.25
37.2
37.15
37.1
37.05
37
-50
MP6601 Rev. 1.01
9/4/2018
-20
10
40
70
100
TEMPERATURE (°C)
130
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MP6601 – 35V, 2.5A, STEPPER MOTOR DRIVER W/ INTERNAL CURRENT SENSE
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 24V, IOUT = 2.5A, 1/4-step, TA = 25°C, resistor + inductor load: R = 3.3Ω, L = 1.5mH/channel,
unless otherwise noted.
VIN Power Start-Up
Normal Operation
CH1: VIN
10V/div.
CH1: IN0
2V/div.
CH2:
AOUT1
20V/div.
CH2: AOUT1
20V/div.
CH3:
CH3: AOUT2
20V/div.
AOUT2
20V/div.
CH4: IOUT
2A/div.
CH4: IOUT
2A/div.
4ms/div.
10ms/div.
VIN Power Shutdown
Sleep Entry
CH1:
SLEEP
5V/div.
CH2:
AOUT1
20V/div.
CH1: VIN
10V/div.
CH2:
AOUT1
20V/div.
CH3:
CH3: AOUT2
20V/div.
AOUT2
20V/div.
CH4: IOUT
2A/div.
CH4: IOUT
2A/div.
10ms/div.
10ms/div.
Sleep Recovery
CH1: SLEEP
5V/div.
CH2:
AOUT1
20V/div.
CH3: AOUT2
20V/div.
CH4: IOUT
2A/div.
10ms/div.
MP6601 Rev. 1.01
9/4/2018
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MP6601 – 35V, 2.5A, STEPPER MOTOR DRIVER W/ INTERNAL CURRENT SENSE
PIN FUNCTIONS
Pin #
QFN
1
Pin #
TSSOP
11
2
12
nFAULT
3
13
ISET
4
14
AI0
5
15
ROSC
6
7
8, 12,
20, 24,
EP
9
16
18
6, 10,
19, 23,
EP
20
BI0
BI1
BOUT1
10, 22
8, 21
VIN
11
13
22
24
BOUT2
BPHASE
14
25
VCP
15
16
28
1
CP2
CP1
17
2
VG
Name
AI1
GND
18
3, 17,
26, 27
4
APHASE
19
5
nSLEEP
21
23
7
9
AOUT2
AOUT1
-
MP6601 Rev. 1.01
9/4/2018
NC
Description
Current-set inputs for phase A.
Fault indication. nFAULT is an open-drain output. nFAULT is at logic low
when a fault condition occurs (i.e.: OCP, OTP, OVP).
Current set programming pin. Connect a resistor from ISET to ground to
set the current through the motor.
Current-set inputs for phase A.
Constant off time programming pin. Connect a resistor from ROSC to
ground to set the PWM off time.
Current-set inputs for phase B.
Power ground.
Bridge B output terminal 1.
Input supply voltage. Both VIN pins must be connected to the same
supply. Decouple VIN to ground with a minimum 100nF ceramic capacitor.
Bridge B output terminal 2.
Phase (direction) input for bridge B.
Charge pump output. Connect a 1µF, 16V ceramic capacitor from VCP
to VIN.
Charge pump capacitor. Connect a 100nF ceramic capacitor rated for
the VIN voltage between these terminals.
Low-side MOSFETs gate drive voltage. Connect a 220nF, 16V ceramic
capacitor from VG to ground.
No connection.
Phase (direction) input for bridge A.
Sleep mode input. Drive nSLEEP to logic low to place the MP6601 in
low-power sleep mode. Drive nSLEEP to logic high to enable normal
operation. nSLEEP has an internal pull-down resistor.
Bridge A output terminal 2.
Bridge A output terminal 1.
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MP6601 – 35V, 2.5A, STEPPER MOTOR DRIVER W/ INTERNAL CURRENT SENSE
BLOCK DIAGRAM
Figure 1: Functional Block Diagram
MP6601 Rev. 1.01
9/4/2018
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MP6601 – 35V, 2.5A, STEPPER MOTOR DRIVER W/ INTERNAL CURRENT SENSE
(tBLANK), the high-side MOSFET (HS-FET)
always turns on in spite of current-limit
detection.
OPERATION
The MP6601 is a bipolar stepper motor driver
that integrates eight N-Channel power
MOSFETs comprised of two internal full-bridges
with 2.5A of current capability. The MP6601
operates over a wide supply voltage range of
4.5 - 35V.
The MP6601 is designed to operate bipolar
stepper motors in full-, half-, and quarter-step
modes. The current of each full-bridge is set by
the output voltage of an internal DAC, which is
controlled by the xI0 and xI1 input pins.
The currents in each of the two outputs are
regulated with programmable, constant off-time,
pulse-width modulation (PWM) control circuitry.
The MP6601 integrates internal current sensing,
eliminating the need for external sense resistors.
Input Interface
The MP6601 contains two full H-bridges that
operate independently. Each H-bridge has an
input signal that controls the current flow
direction in the H-bridge (see Table 1).
Table 1: Input Control Truth Table
xPHASE xOUT1 xOUT2
0
L
H
1
H
L
Additionally, each H-bridge has two input pins
that are used to scale the current regulation
point in the bridge (see Table 2).
Table 2: Current Regulator Sensing
xI1
xI0
Current
0
0
100%
0
1
71%
1
0
38%
1
1
0% (high impedance)
Programmable Constant Off-Time Current
Control
The motor current is regulated by a
programmable constant off-time PWM current
control circuit. Its operation is described below:
Initially, a diagonal pair of MOSFETs turns
on and drives current through the motor
winding.
The current increases in the motor winding,
which is sensed by an internal currentsense circuit. During the initial blanking time
MP6601 Rev. 1.01
9/4/2018
When the current reaches the current trip
threshold, the internal current comparator
either shuts off the HS-FET so the winding
inductance current freewheels through the
two low-side MOSFETs (LS-FET) (slow
decay) or turns on another diagonal pair of
MOSFETs so the current flows back to the
input (fast decay).
The current keeps decreasing for the
constant off-time unless a zero current level
is detected. Afterward, the HS-FET is
enabled to increase the winding current
again.
The cycle then repeats.
Constant-off-time (toff) is determined by the
selection of an external resistor (Rt), which can
be approximated with Equation (1):
t OFF (ns) 190 Rt (k)
(1)
The full-scale (100%) regulation current can be
calculated with Equation (2):
IMax 71k / RISET
(2)
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 HS-FET.
After the PWM cycle begins, the output of the
current sense comparator is ignored for the
fixed blanking time. This blanking time results in
a minimum on time for the PWM cycle.
Automatic Decay Mode
The MP6601 uses a fully automatic decay
mode to provide accurate current regulation.
Initially, slow decay is used. At the end of the
fixed off time, if the current is above the ITRIP
threshold, then fast decay mode is initiated by
reversing the state of the H-bridge outputs.
Once the current level during this fast decay
period drops below the ITRIP threshold,
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MP6601 – 35V, 2.5A, STEPPER MOTOR DRIVER W/ INTERNAL CURRENT SENSE
slow decay is engaged again for another fixed
off time. After the completion of this second
fixed off time, a new PWM cycle begins.
Figure 2 shows the automatic decay mode
operation during a current reduction as a result
of a change in xI0 or xI1.
Figure 2: Slow Decay during tOFF Unless IOUT >
ITRIP at End of tOFF
In some cases (specifically high voltage and
low inductance or regulation of very small
currents), the minimum on time of the PWM
cycle (set by the blanking time described above)
can cause the current to rise very quickly. In
this case, both slow and fast decay are used
(see Figure 3).
Fault (nFAULT)
The MP6601 provides an nFAULT pin that
reports to the system if a fault condition occurs,
such as over-current protection (OCP), overtemperature protection (OTP), or over-voltage
protection (OVP). nFAULT is an open-drain
output type and is driven low when a fault
condition occurs. If the fault condition is
released, nFAULT is pulled high by an external
pull-up resistor.
Over-Current Protection (OCP)
OCP circuitry limits the current through the
MOSFETs by disabling the gate driver. If the
current reaches the over-current limit threshold
and stays there for longer than the over-current
deglitch time, all MOSFETs in the H-bridge are
disabled, and nFAULT is driven low. The driver
is disabled for 5ms, typically. Afterward, the
driver is re-enabled automatically.
Over-current conditions on both the high- and
low-side devices (i.e.: a short to ground, supply,
or across the motor winding) result in an overcurrent shutdown. Note that OCP does not use
the current-sense circuitry used for PWM
current control.
Over-Voltage Protection (OVP)
If the input voltage on VIN is higher than the
OVP threshold, the H-bridge output is disabled,
and nFAULT is driven low. This protection is
released when VIN drops below 38V.
Figure 3: Current Regulation of Low Current/Low
Inductance
Sleep Operation (nSLEEP)
Driving nSLEEP low puts the device into a lowpower sleep state. In this state, the gate drive
charge pump is stopped, and all internal circuits
and H-bridge outputs are disabled. All inputs
are ignored when nSLEEP is active low.
When waking up from sleep mode,
approximately 1ms of time must pass before
issuing a step command to allow the internal
circuitry time to stabilize. nSLEEP has an
internal pull-down resistor.
MP6601 Rev. 1.01
9/4/2018
Input UVLO Protection
If at any time the voltage on VIN falls below the
under-voltage lockout (UVLO) threshold voltage,
all circuitry in the device is disabled, and the
internal logic is reset. Operation resumes when
VIN rises above the UVLO threshold.
Thermal Shutdown
If the die temperature exceeds safe limits, all
MOSFETs in the H-bridge are disabled, and
nFAULT is driven low. Once the die
temperature has fallen to a safe level, operation
resumes automatically.
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11
MP6601 – 35V, 2.5A, STEPPER MOTOR DRIVER W/ INTERNAL CURRENT SENSE
APPLICATIONS INFORMATION
Driving DC Brush Motors
The MP6601 can be used to drive two DC
brush motors. The connections are shown in
Figure 4 below:
PCB Layout
The power dissipated in the output MOSFETs
must be removed from the IC package to keep
the device temperature within limits.
The
exposed pad under the device is used to
conduct heat out of the die.
The pad should be connected to a large copper
area or ground plane, using thermal vias to
transmit heat to other layers as needed.
External components, including the ISET and
ROSC resistors and a supply bypass capacitors,
should be placed as close as possible to the
device.
Figure 4: DC Brush Motor Connection
When driving DC motors with the MP6601,
there are some limitations that must be taken
into account.
Since both H-bridges use the same current
regulation threshold, both motors will current
limit at the same current.
Often, current
regulation is not used with DC brush motors; in
this case, it is recommended to select a 28kΩ
ISET resistor to set the current limit at 2.5A. If it
is desired to limit the stall current of the motors
to a lower value, select an appropriate value for
the ISET resistor as described in Equation (2)
above.
The MP6601 does not support the short brake
function, where both outputs are connected
together. The enable signal shown above drives
the motor when low, and the motor coasts when
high. Speed control can be implemented by
applying a PWM signal to the enable signals.
Bidirectional control can be accomplished by
applying a PWM signal to the direction inputs –
duty cycles above 50% will cause rotation in
one direction, and less than 50% will cause
rotation in the other direction.
MP6601 Rev. 1.01
9/4/2018
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MP6601 – 35V, 2.5A, STEPPER MOTOR DRIVER W/ INTERNAL CURRENT SENSE
PACKAGE INFORMATION
QFN-24 (5mmx5mm)
PIN 1 ID
0.30x45 TYP.
PIN 1 ID
MARKING
PIN 1 ID
INDEX AREA
TOP VIEW
BOTTOM VIEW
SIDE VIEW
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS
.
2) EXPOSED PADDLE SIZE DOES NOT
INCLUDE MOLD FLASH.
3) LEAD COPLANARITY SHALL BE0.10
MILLIMETERS MAX.
4) DRAWING CONFIRMS TO JEDEC MO-220.
5) DRAWING IS NOT TO SCALE.
RECOMMENDED LAND PATTERN
MP6601 Rev. 1.01
9/4/2018
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MP6601 – 35V, 2.5A, STEPPER MOTOR DRIVER W/ INTERNAL CURRENT SENSE
PACKAGE INFORMATION (continued)
TSSOP-28 EP
6.00
TYP
9.60
9.80
0.65
BSC
0.40
TYP
28
15
1.60
TYP
4.30
4.50
PIN 1 ID
3.20
TYP
6.20
6.60
5.80
TYP
14
1
TOP VIEW
RECOMMENDED LAND PATTERN
0.80
1.05
1.20 MAX
SEATING PLANE
0.19
0.30
0.65 BSC
0.00
0.15
0.09
0.20
SEE DETAIL "A"
FRONT VIEW
SIDE VIEW
GAUGE PLANE
0.25 BSC
5.40
5.90
0o-8o
0.45
0.75
DETAIL “A”
2.60
3.10
BOTTOM VIEW
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH,
PROTRUSION OR GATE BURR.
3) PACKAGE WIDTH 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 AET.
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.
MP6601 Rev. 1.01
9/4/2018
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