MP6550
1.8V to 22V, 2A, H-Bridge Motor Driver
DESCRIPTION
FEATURES
The MP6550 is an H-bridge motor driver. The
H-bridge consists of four N-channel power
MOSFETs and an internal charge pump to
generate gate-drive voltages. The MP6550 is
typically used to drive a DC brush motor.
The MP6550 operates on a motor power supply
voltage from 1.8V to 22V, which can supply an
output current of up to 2A according to the logic
control.
The MP6550 has a PWM input interface, which
is compatible with industry-standard devices.
Very low standby circuit current can be
achieved when the device is disabled.
An internal current-sensing circuit provides an
output with a voltage proportional to the load
current. Cycle-by-cycle current regulation and
limiting is also provided. These features do not
require the use of a low-value shunt resistor.
Wide 1.8V to 22V Operating Input Range
2A Continuous Driver Current
MOSFET On Resistance (HS + LS) 240mΩ
Cycle-by-Cycle Current Regulation/Limit
Built-In 3.3V Reference Output
PWM Input Interface, Compatible with
Industry-Standard Devices, Up to 100kHz
Low Standby Circuit Current
Thermal Shutdown
Internal Charge Pump
Cycle-by-Cycle Over-Current Protection
Short-Circuit Protection
Available in a QFN-12 (2mmx2mm)
Package
APPLICATIONS
There are internal shutdown functions for overcurrent protection, short-circuit protection,
under-voltage lockout, and over-temperature
protection.
Robotics
Cameras
Toys
Consumer Products
Medical Devices
All MPS parts are lead-free, halogen free, and adhere to the RoHS directive. For
MPS green status, visit the MPS website under Quality Assurance. “MPS”, the
MPS logo, and “Simple, Easy Solutions” are registered trademarks of Monolithic
Power Systems, Inc. or its subsidiaries.
The MP6550 requires a minimal number of
readily available, standard external components,
and is available in a QFN-12 (2mmx2mm)
package.
TYPICAL APPLICATION
VIN
(1.8V to 22V)
OUT1
VIN
CIN
DC
Motor
M
Controller
IN1
MP6550
IN2
OUT2
VCC
nSLEEP_HB
nSLEEP_LDO
V3P3
VISEN
ISET
3.3VOUT
GND
MP6550 Rev. 1.0
7/16/2019
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1
MP6550 – 1.8V TO 22V, 2A, H-BRIDGE MOTOR DRIVER
ORDERING INFORMATION
Part Number*
MP6550GG
Package
QFN-12 (2mmx2mm)
Top Marking
See Below
* For Tape & Reel, add suffix –Z (e.g. MP6550GG–Z).
TOP MARKING
GX: Product code of MP6550GG
Y: Year code
LLL: Lot number
PACKAGE REFERENCE
TOP VIEW
nSLEEP_HB VISEN
12
11
IN1
1
10
IN2
OUT1
2
9
VIN
GND
3
8
OUT2
V3P3
4
7
ISET
5
6
nSLEEP_LDO VCC
QFN-12 (2mmx2mm)
MP6550 Rev. 1.0
7/16/2019
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2
MP6550 – 1.8V TO 22V, 2A, H-BRIDGE MOTOR DRIVER
PIN FUNCTIONS
Pin #
1
2
3
Name
IN1
OUT1
GND
Description
Input 1. Internal pull-down resistor.
Switch output 1. Connect OUT1 to the motor winding.
Ground.
4
V3P3
3.3V regulator output. Bypass to GND with a 0.47μF capacitor.
5
nSLEEP_LDO
Sleep mode input of LDO output. Pull high for 3.3V LDO normal operation. Pull low to
disable the LDO output and enter low-power sleep mode. Internal pull-down.
6
VCC
Internal circuitry supply bypass. Bypass VCC to GND with a 0.1μF to 10μF capacitor.
7
ISET
8
OUT2
9
VIN
10
11
IN2
VISEN
12
nSLEEP_HB
Current programming resistor. Connect a resistor to ground to set the current limit and
VISEN output voltage.
Switch output 2. Connect OUT2 to the motor winding.
Supply voltage. An input capacitor is needed to prevent large voltage spikes from
appearing at the input.
Input 2. Internal pull-down resistor.
Current-sense output voltage.
Sleep mode input of H-bridge. Pull high for H-bridge normal operation. Pull low to
disable the H-bridge output and enter low-power sleep mode. Internal pull-down.
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance (4)
Supply voltage (VIN) ...................... -0.3V to +24V
VOUTx ....................................... -0.3V to VIN +0.3V
All other pins ..................................... -0.3 to +5V
Continuous power dissipation (TA = 25°C) (2)
……………………………………………...1.56W
Junction temperature ................................ 150°C
Lead temperature...................................... 260°C
Storage temperature .................-65C to +150C
QFN-12 (2mmx2mm).…..…...… 80 ..…16..…°C/W
Recommended Operating Conditions (3)
Supply voltage (VIN) ......................... 1.8V to 22V
Operating junction temp (TJ) .....-40°C to +125°C
MP6550 Rev. 1.0
7/16/2019
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) Continuous current depends on PCB layout and ambient
temperature.
5) Measured on JESD51-7, 4-layer PCB.
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3
MP6550 – 1.8V TO 22V, 2A, H-BRIDGE MOTOR DRIVER
ELECTRICAL CHARACTERISTICS
VIN = 5V, TA = 25°C, unless otherwise noted.
Parameters
Power Supply
Input supply voltage
Symbol Condition
Max
Units
22
V
0.85
1.1
mA
1.2
1.5
mA
VIN = 5V to 22V, IV3P3 =
0A, nSLEEP_HB = 0,
nSLEEP_LDO = 5V
80
120
μA
nSLEEP_HB = 0,
nSLEEP_LDO = 0
10
120
nA
1.68
1.8
100
V
mV
kHz
3.5
V
0.4
50
+5
V
V
μA
μA
kΩ
0.17
0.17
200
200
300
300
100
100
Ω
Ω
ns
ns
ns
ns
ns
ns
200
μs
VIN
Min
1.8
no PWM, no load,
nSLEEP_HB = 5V,
nSLEEP_LDO = 0
Operating supply current
50-kHz PWM, no load,
nSLEEP_HB = 5V,
nSLEEP_LDO = 0
Operating supply current
Sleep mode supply current
Under-voltage lockout threshold rising
Under-voltage lockout threshold hysteresis
Externally applied PWM frequency
V3P3 Regulator
IQ
150
fPWM
VIN > 3.7V, IOUT = 0A to
50mA
LDO output
Control Inputs (IN1, IN2, nSLEEP_HB, nSLEEP_LDO)
Input high voltage
VIH
Input low voltage
VIL
Input high current
IIH
Input low current
IIL
Input pull-down resistance
RPD
Motor Driver Outputs (OUT1, OUT2)
HS switch on resistance
RDS(ON)
LS switch on resistance
RDS(ON)
Output enable time
t1
Output disable time
t2
t3
Delay time
t4
Output rise time
Output fall time
Wake time, nSLEEP_HB rising edge to part
tWAKE
H-bridge active
Dead time
Current Control
Off time
tITRIP
ISET current
Current trip voltage (rising)
Current trip voltage (falling)
MP6550 Rev. 1.0
7/16/2019
Typ
IISET
VITRIP-R
VITRIP-F
3.1
3.3
1.6
VIN = 3.3V
VIN = 0V
-5
520
IO = 800mA, TA = 25°C
IO = 800mA, TA = 25°C
0.12
0.12
INx high to OUTx high
INx low to OUTx low
RL = 20Ω
RL = 20Ω
After ITRIP
At VISEN pin
At VISEN pin
95
475
380
100
ns
17
μs
100
500
400
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105
525
420
µA/A
mV
mV
4
MP6550 – 1.8V TO 22V, 2A, H-BRIDGE MOTOR DRIVER
ELECTRICAL CHARACTERISTICS (continued)
VIN = 5V, TA = 25°C, unless otherwise noted.
Parameters
VISEN Output
Symbol Condition
Output voltage accuracy
ΔVVISEN VISET > 0.1V
Protection Circuits
Current limit
OCP retry time
Thermal shutdown threshold (6)
Thermal shutdown hysteresis (6)
Min
Typ
-5
IOCP
tOCR
TTSD
4
5
2.5
160
25
Max
Units
+5
%
6
A
ms
°C
°C
Note:
6) Guaranteed by design.
IN1
IN2
t
OUT1
t4
t2
Z
Z
t3
OUT2
Z
Z
Figure 1: Input/Output Timing
MP6550 Rev. 1.0
7/16/2019
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MP6550 – 1.8V TO 22V, 2A, H-BRIDGE MOTOR DRIVER
TYPICAL CHARACTERISTICS
Current Sense (ISET = 2kΩ)
1
1.5
2
2.5
500
450
400
350
300
250
200
150
100
50
0
250
ISET (μA)
200
150
100
50
Iset
Visen
0
0
0.5
1
1.5
IOUT (A)
2
102.5
102
101.5
ISET (μA)
0.5
IOUT = 1A
VISEN (mV)
0
ISET vs. Temperature
101
100.5
100
99.5
99
98.5
2.5
-50
Current Trip Voltage (Rising) vs.
Temperature
Current Trip Voltage (Falling) vs.
Temperature
506
VITRIP (mV)
VITRIP (mV)
504
502
500
498
496
494
492
490
-50
0
50
TEMPERATURE (°C)
410
408
406
404
402
400
398
396
394
392
390
-50
100
HS RON vs. Temperature
0
50
TEMPERATURE (°C)
100
LS RON vs. Temperature
IOUT = 800mA
IOUT = 800mA
160
140
140
120
120
LS_RON (Ω)
HS_RON (Ω)
0
50
100
TEMPERATURE (°C)
100
80
60
100
80
60
40
40
20
20
0
0
-50
0
50
TEMPERATURE (°C)
MP6550 Rev. 1.0
7/16/2019
100
-50
0
50
TEMPERATURE (°C)
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100
6
MP6550 – 1.8V TO 22V, 2A, H-BRIDGE MOTOR DRIVER
HS RON vs. VIN
LS RON vs. VIN
IOUT = 800mA
IOUT = 800mA
200
190
180
170
160
150
140
130
120
110
100
90
80
LS_RON (Ω)
HS_RON (Ω)
TYPICAL CHARACTERISTICS (continued)
0
10
VIN (V)
MP6550 Rev. 1.0
7/16/2019
20
100
98
96
94
92
90
88
86
84
82
80
0
10
VIN (V)
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7
MP6550 – 1.8V TO 22V, 2A, H-BRIDGE MOTOR DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 5V, TA = 25°C, unless otherwise noted.
Normal Operation
VIN Start-Up
IN1 = H, IN2 = L, VIN = 5V, load = 2Ω + 700μH
IN1 = H, IN2 = L, VIN = 5V, load = 2Ω + 700μH
CH1: OUT1
CH1: OUT1
5V/div.
CH2: ISET
200mV/div.
5V/div.
CH2: VIN
5V/div.
CH3: VISEN
200mV/div.
CH3:
VISEN
200mV/div.
CH4: IO
500mA/div.
CH4: IO
500mA/div.
40μs/div.
4ms/div.
VIN Shutdown
Sleep Start-Up
IN1 = H, IN2 = L, VIN = 5V, load = 2Ω + 700μH
IN1 = H, IN2 = L, VIN = 5V, load = 2Ω + 700μH
CH1: OUT1
CH1: OUT1
5V/div.
CH2: VIN
5V/div.
CH3: VISEN
200mV/div.
5V/div.
CH2:
SLEEP
5V/div.
CH3:
VISEN
200mV/div.
CH4: IO
500mA/div.
CH4: IO
500mA/div.
400μs/div.
100ms/div.
SCP-OUT Short to VIN
Sleep Shutdown
IN1 = H, IN2 = L, VIN = 5V, load = 2Ω + 700μH
IN1 = H, IN2 = L, VIN = 22V
CH1: OUT1
CH1: OUT1
5V/div.
CH2: SLEEP
5V/div.
CH3: VISEN
200mV/div.
20V/div.
CH2: OUT2
20V/div.
CH4: IO
500mA/div.
CH4: ISC
10A/div.
400μs/div.
MP6550 Rev. 1.0
7/16/2019
1ms/div.
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MP6550 – 1.8V TO 22V, 2A, H-BRIDGE MOTOR DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 5V, TA = 25°C, unless otherwise noted.
SCP-OUT Short to GND
SCP-OUT Short to OUT
IN1 = H, IN2 = L, VIN = 22V
IN1 = H, IN2 = L, VIN = 22V
CH1: OUT1
CH1: OUT1
20V/div.
20V/div.
CH2: OUT2
20V/div.
CH2: OUT2
20V/div.
CH4: ISC
10A/div.
CH4: ISC
10A/div.
1ms/div.
MP6550 Rev. 1.0
7/16/2019
1ms/div.
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MP6550 – 1.8V TO 22V, 2A, H-BRIDGE MOTOR DRIVER
SINGLE-CHANNEL BLOCK DIAGRAM
VIN
VIN
VCC
3.3V
V3P3
Charge
Pump
VREF
Int. VCC
LS Gate Drive V
UVLO
OTS
3.3V
OUT
OUT1
Gate
Driver
Controller
nSLEEP_LDO
IN1
IN2
OUT2
Control
Logic
Curr.
Reg.
nSLEEP_HB
ISENSE
VISEN
ITRIP
GND
+
ISET
RISET
Figure 2: Single-Channel Block Diagram
MP6550 Rev. 1.0
7/16/2019
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MP6550 – 1.8V TO 22V, 2A, H-BRIDGE MOTOR DRIVER
OPERATION
Bridge Control
The MP6550 is controlled using a PWM input
interface, which is compatible with industrystandard devices. Each output is controlled by a
corresponding input pin.
Current Limit / Regulation
The current in the outputs is limited using
constant-off-time PWM (pulse-width modulation)
control circuitry. Figure 3 shows this operation.
The following table shows the logic for the
MP6550:
Table 1: Input Logic Truth Table
IN1
IN2
OUT1
OUT2
Function
(DC Motor)
L
L
Z
Z
Coast
L
H
L
H
Reverse
H
L
H
L
Forward
H
H
L
L
Brake
Table 2 shows the recommended PWM input
control for a DC motor driver.
Table 2: PWM Input Control
IN1
IN2
H
PWM
PWM
L
H
H
OUT1 OUT2
Function
(DC Motor)
L
H
L
Forward
H
L
L
Slow decay
L
H
Reverse
L
L
Slow decay
Current Sensing
The current flowing in the two low-side
MOSFETs is sensed with an internal currentsensing circuit. A voltage proportional to the
output current is sourced on the VISEN pin.
The VISEN output voltage scaling is set by a
resistor connected between the ISET pin and
ground. For 1A of output current, 100µA of
current is sourced into the resistor connected to
VISEN. For example, if a 5kΩ resistor is
connected between ISET and ground, the
output voltage on the VISEN pin will be 0.5V/A
of output current.
Current is sensed any time one of the low-side
MOSFETs is turned on, including during slow
decay (brake) mode.
Figure 3: Current Limit Operation
Initially, a diagonal pair of MOSFETs turns on
and drives current through the load. The current
increases in the load, which is sensed by the
internal current-sense circuit.
If the load current reaches the current trip
threshold, the H-bridge switches to slow decay
mode, and the two low-side MOSFETs turn on.
After a fixed off time (tITRIP), if the load current
has fallen at least 20% below the current limit
threshold, the FETs are re-enabled and the
cycle repeats. If the current remains above this
level, the off time is extended until the current
falls to 20% below the current limit threshold.
The current limit threshold is reached when the
VISEN pin reaches 0.5V. For example, with a
5kΩ resistor from ISET to ground, the VISEN
voltage is about 0.5V/A of output current. So
when the current reaches 1A, the VISET pin
voltage reaches 0.5V, and a current trip occurs.
During current regulation, the nFAULT pin is not
activated.
Blanking Time
There is often a current spike during start-up
due to the body diode’s reverse-recovery
current or the shunt capacitance of the load.
This current spike requires filtering to prevent it
from erroneously shutting down the high-side
MOSFET. An internal fixed blanking time (tOCPD)
blanks the output of the current sense
comparator when the outputs are switched.
This blanking time also sets the minimum on
time for high-side MOSFET.
The load current applied to the VISEN pin
should be kept below 2mA, with no more than
500pF of capacitance.
MP6550 Rev. 1.0
7/16/2019
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11
MP6550 – 1.8V TO 22V, 2A, H-BRIDGE MOTOR DRIVER
nSLEEP Operation
The MP6550 has one H-bridge driver and a
3.3V reference output, which can be separately
put into a low-power sleep state. Driving
nSLEEP_HB low turns the H-bridge outputs off
and disables all related internal circuits,
including the gate drive charge pump. All inputs
are ignored when nSLEEP_HB is active low.
Driving nSLEEP_LDO low disables the 3.3V
regulator. When waking up from sleep mode,
some time needs to pass before the outputs will
operate.
Protection Circuits
The MP6550 is fully protected against undervoltage, over-current, and over-temperature
events.
Over-Current Protection (OCP)
The MP6550 has internal overload and shortcircuit protection. The currents in both the high-
MP6550 Rev. 1.0
7/16/2019
side and low-side MOSFETs are measured and
if the current exceeds the current limit, all
MOSFETs in the H-bridge are turned off. After
approximately 1ms, the bridge is automatically
re-enabled.
Thermal Shutdown (TSD)
Thermal monitoring is also integrated into the
MP6550. If the die temperature exceeds 160°C,
all switches turn off. Once the die temperature
has fallen to a safe level, operation resumes
automatically.
Under-Voltage Lockout (UVLO)
If at any time the voltage on the VIN pin falls
below the under-voltage lockout (UVLO)
threshold voltage, all circuitry in the device is
disabled and the internal logic is reset. Normal
operation resumes when VIN exceeds the
UVLO threshold.
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MP6550 – 1.8V TO 22V, 2A, H-BRIDGE MOTOR DRIVER
PACKAGE INFORMATION
QFN-12 (2mmx2mm)
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.
MP6550 Rev. 1.0
7/16/2019
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