MP6551
14V, 5A, H-Bridge
Motor Driver
DESCRIPTION
FEATURES
The MP6551 is an H-bridge motor driver. Its
2.5V to 14V input voltage (VIN) range allows the
device to operate from a variety of battery
power sources, including single-cell lithium-ion
batteries, dual-cell lithium-ion batteries, and 3cell to 6-cell alkaline batteries. Its low on
resistance enables it to achieve up to 5A of
output current (IOUT) across its entire VIN range.
The MP6551 can drive a brushed DC motor in
bidirectional applications or two DC motors in
unidirectional, speed-controlled applications.
Full protection features include over-current
protection (OCP), under-voltage lockout
(UVLO) protection, and thermal shutdown.
The MP6551 is available
(2.5mmx3mm) package.
in
a
QFN-14
2.5V to 14V Operating Input Range
Up to 5A Output Current (IOUT)
Full H-Bridge or Dual Half H-Bridge Driver
15mΩ Low On Resistance per MOSFET
Current Measurement
Over-Current Protection (OCP)
Under-Voltage Lockout (UVLO) Protection
Thermal Shutdown
Sleep Mode during Low-Power
Fault Indication Output
Available in a QFN-14 (2.5mmx3mm)
Package
APPLICATIONS
Mini Drones
Battery-Powered Toys
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”, the MPS logo, and “Simple, Easy Solutions” are
trademarks of Monolithic Power Systems, Inc. or its subsidiaries.
TYPICAL APPLICATION
VIN
µC
IN1
EN1
IN2
EN2
VIN
MP6551
nFAULT
OUT1
CM1
CM2
Drives 1x
bidirectional or 2x
unidirectional motors
SR
OUT2
GND
MP6551 Rev. 1.0
7/7/2021
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1
MP6551 – 14V, 5A, H-BRIDGE MOTOR DRIVER
ORDERING INFORMATION
Part Number*
MP6551GQB
Package
QFN-14 (2.5mmx3mm)
Top Marking
See Below
MSL Rating
1
* For Tape & Reel, add suffix -Z (e.g. MP6551GQB-Z).
TOP MARKING
BCR: Product code of MP6551GQB
Y: Year code
WW: Week code
LLL: Lot number
PACKAGE REFERENCE
TOP VIEW
OUT1 GND OUT2
7
CM2
12
6
SR
IN1
13
5
IN2
EN1
14
4
EN2
CM1
11
nFAULT
10
1
9
2
8
3
OUT1 VIN OUT2
QFN-14 (2.5mmx3mm)
MP6551 Rev. 1.0
7/7/2021
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2
MP6551 – 14V, 5A, H-BRIDGE MOTOR DRIVER
PIN FUNCTIONS
Pin #
1, 10
Name
OUT1 (1)
2
VIN (1)
3, 8
OUT2 (1)
4
EN2
5
IN2
6
7
9
11
SR
CM2
GND (1)
CM1
12
nFAULT
13
IN1
14
EN1
Description
Output terminal 1.
Input supply voltage. Decouple the VIN pin to GND using a ≥100nF ceramic capacitor.
Additional bulk capacitance may be required.
Output terminal 2.
OUT2 enable input. Pull the EN2 pin high to enable OUT2; pull EN2 low to force OUT2
into a high-impedance (Hi-Z) state. EN2 is pulled down internally.
OUT2 control input. Pull the IN2 pin high to make OUT2 go high; pull IN2 low to make
OUT2 go low. IN2 is pulled down internally.
Slew rate control. Connect a resistor from SR to GND.
OUT2 current measurement output.
System ground.
OUT1 current measurement output.
Fault indication. The nFAULT pin is an open-drain output. If an over-current (OC) or
over-temperature (OT) fault occurs, nFAULT is pulled low.
OUT1 control input. Pull the IN1 pin high make OUT1 go high; pull IN1 low to make
OUT1 go low. IN1 is pulled down internally.
OUT1 enable input. Pull EN1 high to enable OUT1; pull EN1 low force OUT1 into a
high-impedance (Hi-Z) state. EN1 is pulled down internally.
Note:
1) These pins should have as much PCB copper attached to them as possible. The copper removes the dissipated heat in the device.
θJA
θJC
ABSOLUTE MAXIMUM RATINGS (2)
Thermal Resistance (5)
Supply voltage (VIN) ..................... -0.3V to +16V
OUTx voltage (VOUTX) ................... -0.7V to +16V
All other pins to GND .................. -0.3V to +6.5V
Continuous power dissipation (TA = 25°C) (3)…..
……………………………………………...1.92W
Storage temperature ................ -55°C to +150°C
Junction temperature ............................... 150°C
Lead temperature (solder) ....................... 260°C
QFN-14 (2.5mmx3mm)...........65......13.....°C/W
Recommended Operating Conditions (4)
Supply voltage (VIN) ........................ 2.5V to 14V
Peak output current (IOUT) ............................±5A
Operating junction temp (TJ) .... -40°C to +125°C
MP6551 Rev. 1.0
7/7/2021
Notes:
2) Exceeding these ratings may damage the device.
3) 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 can cause excessive die temperature, and the
device may go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
4) The device is not guaranteed to function outside of its
operating conditions.
5) Measured on JESD51-7, 4-layer PCB.
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3
MP6551 – 14V, 5A, H-BRIDGE MOTOR DRIVER
ELECTRICAL CHARACTERISTICS
VIN = 4V, TA = 25°C, unless otherwise noted.
Parameter
Power Supply
Input supply voltage
Quiescent current
Internal MOSFETs
High-side MOSFET (HS-FET)
output on resistance
Low-side MOSFET (LS-FET)
output on resistance
Body diode forward voltage
Control Logic
Input logic low threshold
Input logic high threshold
Symbol
VIN
IQ
ISLEEP
Condition
Typ
Max
Units
2.5
10.5
14
4
14.5
V
mA
µA
2.5
No load current
Sleep mode
RDS(ON)_HS
IOUT = 1A, TJ = 25°C
15
19
mΩ
RDS(ON)_LS
IOUT = 1A, TJ = 25°C
12
16
mΩ
IOUT = 2A
0.8
VF
VIN_LOW
VIN_HIGH
IIN_HIGH
Logic input current
IIN_LOW
RPD
Internal pull-down resistance
nFault Output (Open-Drain Output)
Low output voltage
VOUT_LOW
High output leakage current
IOUT_HIGH
Protection Circuits
Under-voltage lockout (UVLO)
VUVLO_RISING
rising threshold
VUVLO_HYS
UVLO hysteresis
IOCP1
Peak current limit
IOCP2
Thermal shutdown (6)
TSD
Thermal shutdown hysteresis (6)
TSD_HYS
Current Sense (CS)
VIH = 5V
VIL = 0.8V
2.5
Sink
Source
From EN1 = EN2 = 0
From EN1 = 1 or EN2 = 1
fPWM
RSR = 0Ω
tPD_RISING
Propagation delay (6)
tPD_FALLING
Output enable time (6)
tOUT_EN
Output disable time (6)
tOUT_DIS
+20
+20
IOUT = 5mA
VOUT = 3.3V
tSLEEP
tWAKE
tRISING
tFALLING
1.5
-20
-20
500
LS-FET current = 1A
LS-FET current = -1A
CS output current
V
0.8
CS ratio
CS output voltage swing
Sleep mode entry time
Sleep mode exit time
Pulse-width modulation (PWM)
frequency
Output rise time (6)
Output fall time (6)
Min
RSR = 3MΩ, 10Ω load to
GND
IN1/IN2 rising to
OUT1/OUT2 rising
IN1/IN2 falling to
OUT1/OUT2 falling
EN1/EN2 to OUT1/OUT2,
active
EN1/EN2 to OUT1/OUT2,
Hi-Z
10
8.5
500
14
11.5
150
15
1/
10,000
120
-91
3.57
1
36
V
V
µA
µA
kΩ
0.5
1
V
µA
2.7
V
mV
A
A
°C
°C
A/A
µA
µA
V
ms
µs
500
kHz
3
µs
500
ns
400
ns
95
ns
170
ns
Note:
6) Not tested in production.
MP6551 Rev. 1.0
7/7/2021
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4
MP6551 – 14V, 5A, H-BRIDGE MOTOR DRIVER
TYPICAL CHARACTERISTICS
HS-FET On Resistance vs.
Temperature
20
2.5
ON RESISTANCE (mΩ)
UVLO RISING THRESHOLD (V)
UVLO Rising Threshold vs.
Temperature
2.49
2.48
2.47
2.46
18
16
14
12
10
2.45
-50
-20
10
40
70
TEMPERATURE (°C)
100
-50
130
IOUT = 1A
-50
-20
13
10
40
70
100
TEMPERATURE ( C)
130
OCP THRESHOLD (A)
OCP THRESHOLD (A)
MP6551 Rev. 1.0
7/7/2021
10
40
70
100
TEMPERATURE ( C)
130
VIN = 4V
12
11.5
11
10.5
10
9.5
9
-50
-20
10
40
70
100
TEMPERATURE ( C)
130
LS-FET OCP Threshold vs.
Temperature
12
11.5
11
10.5
10
9.5
9
8.5
8
7.5
7
-20
10
40
70
100
TEMPERATURE ( C)
12.5
HS-FET OCP Threshold vs.
Temperature
-50
-20
Sleep Mode Current vs.
Temperature
SLEEP MODE CURRENT (µA)
ON RESISTANCE (mΩ)
LS-FET On Resistance vs.
Temperature
18
17
16
15
14
13
12
11
10
9
8
IOUT = 1A
130
16
15.5
15
14.5
14
13.5
13
12.5
12
11.5
11
10.5
10
-50
-20
10
40
70
100
TEMPERATURE ( C)
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130
5
MP6551 – 14V, 5A, H-BRIDGE MOTOR DRIVER
TYPICAL CHARACTERISTICS (continued)
Current Sense Output Current
vs. Temperature
135
133
131
129
127
125
123
121
119
117
115
LS-FET current = 1A
97
OUTPUT CURRENT (µA)
OUTPUT CURRENT (µA)
Current Sense Output Current
vs. Temperature
-50
-20
10
40
70
100
TEMPERATURE ( C)
130
LS-FET current = -1A
96.5
96
95.5
95
94.5
94
-50
-20
10
40
70
100
TEMPERATURE ( C)
130
Rise/Fall Time vs. SR Resistor
IOUT = 2A
RISE/FALL TIME (ns)
3500
3000
2500
2000
1500
Rise time
1000
Fall time
500
0
0
MP6551 Rev. 1.0
7/7/2021
500 1000 1500 2000 2500 3000 3500
SR RESISTOR (kΩ)
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MP6551 – 14V, 5A, H-BRIDGE MOTOR DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 14V, IOUT = 2A, OUT1 fSW = 20kHz, OUT2 LS-FET on, VREF = 3.3V, current-sense resistor
divider = 5kΩ, TA = 25°C, resistor + inductor load = 1.4Ω + 0.19mH between OUT1 and OUT2.
Steady State
Power Ramping Up
50% duty cycle
50% duty cycle
CH1: VIN1
CH1: VIN
CH2: VOUT1
CH2: VOUT1
CH3: CM2
CH3: CM2
CH4: lOUT
CH4: lOUT
Power Ramping Down
EN Ramping Up
50% duty cycle
50% duty cycle
CH1: EN1
CH1: VIN
CH2: VOUT1
CH2: VOUT1
CH3: CM2
CH3: CM2
CH4: lOUT
CH4: lOUT
EN Ramping Down
Sleep Mode Entry
50% duty cycle
50% duty cycle
CH1: EN1
CH1: EN1/2
CH2: VOUT1
CH2: VOUT1
CH3: CM2
CH3: CM2
CH4: lOUT
CH4: lOUT
MP6551 Rev. 1.0
7/7/2021
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7
MP6551 – 14V, 5A, H-BRIDGE MOTOR DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 14V, IOUT = 2A, OUT1 fSW = 20kHz, OUT2 LS-FET on, VREF = 3.3V, current-sense resistor
divider = 5kΩ, TA = 25°C, resistor + inductor load = 1.4Ω + 0.19mH between OUT1 and OUT2.
Sleep Mode Recovery
50% duty cycle
CH1: VEN1/
VEN2
CH2: VOUT1
CH3: CM2
CH4: lOUT
MP6551 Rev. 1.0
7/7/2021
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MP6551 – 14V, 5A, H-BRIDGE MOTOR DRIVER
FUNCTIONAL BLOCK DIAGRAM
VIN
VIN
UVLO
OTP
Charge
Pump
nFAULT
IN1
EN1
IN2
Drives 1x bidirectional
motor or 2x unidirectional
motors
OUT1
Control
Logic
Gate
Drivers
EN2
DCM
OUT2
µC
Current
Limit
CM1
CM2
VREF
GND
SR
Figure 1: Functional Block Diagram
MP6551 Rev. 1.0
7/7/2021
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MP6551 – 14V, 5A, H-BRIDGE MOTOR DRIVER
OPERATION
The MP6551 is an H-bridge motor driver that
integrates four N-channel power MOSFETs. It
can achieve 5A of peak output current (IOUT)
across a 2.5V to 14V input voltage (VIN) range,
and is designed to drive brushed DC motors,
solenoids, and other loads.
Input Logic
Each of the MP6551’s half H-bridges is
controlled independently via the IN1, IN2, EN1,
and EN2 input pins. Table 1 shows the control
logic for each input pin.
Table 1: Input Pin Control Logic
INx
X
0
1
ENx
0
1
1
OUTx
Z
L
H
Sleep Mode
Pull the EN1 and EN2 pins low to enable sleep
mode. In sleep mode, all internal circuitry
(including the gate driver charge pump) is
disabled, and the outputs are turned off. If
either EN1 or EN2 is enabled again, then the
device resumes normal operation. There is a
short delay time (tWAKE) before the output(s) are
enabled again.
Current Measurement Outputs
The internal current-sensing circuitry senses
the current flowing into each output. The CM1
and CM2 pins source or sink a current
proportional to the current flowing into each of
the half H-bridges’ low-side MOSFETs (LSFETs). The current flowing through the LS-FET
is sensed in both the forward and reverse
directions.
To convert this current into a voltage (e.g. to
input to an analog-to-digital converter [ADC]), a
termination resistor (RREF) is required to create
a reference voltage (VREF). If no current is
flowing, then the resultant output is equal to
VREF. If the current is flowing, then the voltage is
above or below VREF. (VOUT_SENSE) can be
calculated with Equation (1):
VOUT_SENSE = VREF + (RREF x ILOAD) / 10,000 (1)
To terminate the outputs while using an ADC
with inputs that are ratiometric to its supply
voltage, connect two equal-value resistors to
the ADC supply and GND. The resulting ADC
code is half-scale at zero current.
Figure 2 shows the current measurement circuit.
OUTx
Slew Rate (SR) Control
The MP6551 has a slew rate (SR) control pin.
Use a resistor to connect the SR pin to GND to
adjust the slew rate (output rise/fall time). This
feature can reduce electromagnetic interference
(EMI) caused by output transitions.
The rise/fall time is proportional to the
resistance used. Short SR to GND to generate
a fast rise/fall time (about 100ns). A 3MΩ
resistor generates a rise/fall time of about 3µs.
Fault Indication
The MP6551’s fault indication (nFAULT) pin is
an open-drain output that requires an external
pull-up resistor. The nFAULT pin indicates if a
fault has occurred. If an over-current (OC) or
over-temperature (OT) fault occurs, nFAULT is
pulled low. Once the fault condition is removed,
nFAULT is pulled high via the pull-up resistor.
MP6551 Rev. 1.0
7/7/2021
x1
IOUT_SENSE
x10,000
CMx
VOUT_SENSE
ILOAD
x1
RREF
GND
VREF
Matched
IOUT_SENSE = ILOAD / 10,000
VOUT_SENSE = VREF + (IOUT_SENSE x RREF )
VOUT_SENSE = VREF + (ILOAD x RREF ) / 10,000
Figure 2: Current Measurement Circuit
If only the total current needs to be measured
(e.g. the current of a full H-bridge driver), then
the CM1 and CM2 pins can be connected to
measure the sum of the two half H-bridge
currents.
Over-Current Protection (OCP)
Over-current protection (OCP) protects the
device from damage due to excessive current
at the outputs. If the current through a MOSFET
exceeds the current limit threshold, then the
foldback current limit function limits IOUT to a
safe level and nFAULT goes low.
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10
MP6551 – 14V, 5A, H-BRIDGE MOTOR DRIVER
Over-current (OC) conditions are sensed on
both the high-side MOSFET (HS-FET) and LSFET, protecting the device from damage during
a short to GND, short to supply, or a short
across the motor winding.
Thermal Shutdown
If the die temperature exceeds about 150°C, all
MOSFETs are disabled and nFAULT goes low.
Once the die temperature drops below about
135°C, the MP6551 resumes normal operation.
Note that a sustained short circuit or OC fault
can result in excessive die temperature, which
may cause the device to go into thermal
shutdown.
Under-Voltage Lockout (UVLO) Protection
If the VIN drops below the under-voltage lockout
(UVLO) threshold, all circuitry is disabled and
the device’s internal logic is reset. Once VIN
rises above the UVLO threshold again, the
MP6551 resumes normal operation.
MP6551 Rev. 1.0
7/7/2021
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MP6551 – 14V, 5A, H-BRIDGE MOTOR DRIVER
APPLICATION INFORMATION
External Component Selection
Bypass the VIN pin to GND using a 100nF
ceramic X7R capacitor located as close to the
IC as possible. Place an additional 1µF to 10µF
ceramic capacitor nearby the 100nF capacitor.
Depending on the supply impedance and
distance to other large capacitors, an
electrolytic bulk capacitor may also be required
to stabilize VIN. The CM1 and CM2 pins are
current measurement outputs. CM1 and CM2
are typically converted to a voltage via a
termination resistor (RREF) that creates a
reference voltage (VREF). A resistor divider
connected between the ADC supply and GND
can provide a ratiometric voltage for an AC/DC
converter.
PCB Layout Guidelines
Efficient PCB layout is critical for stable
operation. For the best results, refer to Figure 3
and follow the guidelines below:
1. Bypass VIN to GND using a 100nF ceramic
X7R capacitor located as close to the IC as
possible.
2. Place an additional 1µF to 10µF ceramic
capacitor nearby the 100nF capacitor. An
electrolytic bulk capacitor may be required
to stabilize VIN.
3. The VIN, OUT1, and OUT2 pins dissipate
heat from the motor driver. To reduce heat
on the device, add as many copper planes
to these pins as possible.
4. Solid planes on the inner layers of the
device can also dissipate heat. Place
multiple thermal vias on the VIN, OUTx, and
GND copper planes to dissipate heat from
the outer layers to the copper plane(s).
Figure 3: Recommended PCB Layout
MP6551 Rev. 1.0
7/7/2021
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12
MP6551 – 14V, 5A, H-BRIDGE MOTOR DRIVER
TYPICAL APPLICATION CIRCUIT
VIN
IN1
EN1
IN2
EN2
µC
nFAULT
VIN
C3
100nF
+
C1
470μF
MP6551
nFAULT
CM1
C2
10μF
OUT1
OUT1
CM1
CM2
CM2
SR
RSR
0Ω to 500kΩ
OUT2
OUT2
GND
VREF
VCC
R2
4.99kΩ
R3
4.99kΩ
CM1
CM2
R4
4.99kΩ
R1
499Ω
R5
4.99kΩ
nFAULT
Figure 4: Typical Application Circuit
MP6551 Rev. 1.0
7/7/2021
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MP6551 – 14V, 5A, H-BRIDGE MOTOR DRIVER
PACKAGE INFORMATION
QFN-14 (2.5mmx3mm)
MP6551 Rev. 1.0
7/7/2021
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14
MP6551 – 14V, 5A, H-BRIDGE MOTOR DRIVER
CARRIER INFORMATION
Pin1
1
1
ABCD
1
1
ABCD
ABCD
ABCD
Feed Direction
Part Number
MP6551GQB-Z
MP6551 Rev. 1.0
7/7/2021
Package
Description
QFN-14
(2.5mmx3mm)
Quantity/
Reel
Quantity/
Tube
Quantity/
Tray
Reel
Diameter
5000
N/A
N/A
13in
Carrier
Carrier
Tape Width Tape Pitch
12mm
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8mm
15
MP6551 – 14V, 5A, H-BRIDGE MOTOR DRIVER
REVISION HISTORY
Revision #
Revision Date
1.0
07/07/2021
Description
Pages Updated
Initial Release
-
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.
MP6551 Rev. 1.0
7/7/2021
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