The Future of Analog IC Technology
1.5A, 2MHz, 55V
Step-Down Converter
Available in AEC-Q100
FEATURES
Guaranteed Industrial/Automotive
Temperature Range Limits
Wide 3.8V to 55V Operating Input Range
300mΩ Internal Power MOSFET
Up to 2MHz Programmable Switching
Frequency
140μA Quiescent Current
Stable with Ceramic Capacitor
External Soft-Start
Up to 95% Efficiency
Output Adjustable from 0.8V to 52V
Available in QFN10 (3mmx3mm) package
AEC-Q100 Qualified
High-Voltage Power Conversion
Automotive Systems
Industrial Power Systems
Distributed Power Systems
Battery Powered Systems
MPQ4561
DESCRIPTION
The MPQ4561 is a high-frequency, step-down,
switching regulator with an integrated internal
high-side high voltage power MOSFET. It
provides up to a 1.5A output with current mode
control for fast loop response and easy
compensation.
The wide 3.8V-to-55V input range accommodates
a variety of step-down applications, including
those in automotive input environment. A 12µA
shutdown mode supply current makes it suitable
for battery-powered applications.
A scaled-down switching frequency in light-load
conditions provides high power-conversion
efficiency over a wide load range while reducing
switching and gate driver losses.
The frequency foldback prevents inductor current
runaway during startup and thermal shutdown
provides reliable, fault tolerant operation.
By switching at 2MHz, the MPQ4561 is able to
prevent EMI (Electromagnetic Interference) noise
problems, such as those found in AM radio and
ADSL applications.
The MPQ4561 is available in a 3mm x 3mm
QFN10 package with an exposed pad.
APPLICATIONS
All MPS parts are lead-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
C4
100nF
10
V
IN
9
C1
100V
EN
3
8
7
EN
SS
FREQ
GND
6
COMP
4
C3
470pF
VIN
BST
SW
1.2
D1
FB
5
C2
6.3V
L1
V
OUT
3.3V
100
90
V
IN
=12V
EFFICIENCY (%)
80
70
60
50
40
0
0.5
I
OUT
(A)
1
1.5
MPQ4561
V
IN
=55V
C5
10nF
MPQ4561 Rev. 1.12
www.MonolithicPower.com
1/23/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
1
MPQ4561 – 1.5A, 2MHz, 55V STEP-DOWN CONVERTER
ORDERING INFORMATION
Part Number
MPQ4561DQ*
MPQ4561DQ-AEC1**
Package
QFN10 (3x3mm)
Top Marking
9C
9C
Junction Temperature (T
J
)
–40°C to +125°C
*
For Tape & Reel, add suffix –Z (e.g. MPQ4561DQ–AEC-Z)
For RoHS compliant packaging, add suffix –LF (e.g. MPQ4561DQ–AEC-LF–Z)
** Available End Sept. 2011
PACKAGE REFERENCE
TOP VIEW
SW
SW
EN
COMP
FB
1
2
3
4
5
10
9
8
7
6
BST
VIN
SS
FREQ
GND
EXPOSED PAD
Connect to GND Plane
ABSOLUTE MAXIMUM RATINGS
(1)
Supply Voltage (V
IN
).....................–0.3V to +60V
Switch Voltage (V
SW
)..........–0.5V to (V
IN
+ 0.5V)
BST to SW .....................................–0.3V to +5V
All Other Pins .................................–0.3V to +5V
(2)
Continuous Power Dissipation (T
A
= 25°C)
............................................................. 2.5W
Junction Temperature ...............................150°C
Lead Temperature ....................................260°C
Storage Temperature.............. –65°C to +150°C
Thermal Resistance
(4)
θ
JA
θ
JC
QFN10 (3x3mm) .....................50 ...... 12 ... °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 T
J
(MAX), the junction-to-
ambient thermal resistance
θ
JA
, and the ambient temperature
T
A
. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by P
D
(MAX)=(T
J
(MAX)-
T
A
)/θ
JA
. 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 board.
Recommended Operating Conditions
(3)
Supply Voltage V
IN
...........................3.8V to 55V
Output Voltage V
OUT
.........................0.8V to 52V
Maximum Junction Temp. (T
J
) ................+125C
MPQ4561 Rev. 1.12
www.MonolithicPower.com
1/23/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
2
MPQ4561 – 1.5A, 2MHz, 55V STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
V
IN
= 12V, V
EN
= 2.5V, V
COMP
= 1.4V, T
J
= -40°C to +125°C, unless otherwise noted. Typical values
are at T
J
=25°C.
Parameter
Feedback Voltage
(5)
Symbol Condition
V
FB
4.5V < V
IN
< 55V
–40°C to +125°C
V
BST
– V
SW
= 5V
–40°C to +125°C
V
EN
= 0V, V
SW
= 0V
–40°C to +125°C
(Duty Cycle
≤
60%)
G
CS
I
COMP
= ±3µA
V
FB
= 0.7V
V
FB
= 0.9V
–40°C to +125°C
0V < V
FB
< 0.8V, C
SS
=10nF
R
FREQ
= 95kΩ
–40°C to +125°C
V
EN
< 0.3V
No load, V
FB
= 0.9V
Hysteresis = 20°C
–40°C to +125°C
–40°C to +125°C
Min
0.766
Typ
0.795
Max
0.829
Units
V
Upper Switch On Resistance
Upper Switch Leakage
Current Limit
R
DS(ON)
200
300
1
475
mΩ
μA
1.7
2.5
4.5
400
120
10
-10
3.3
A
A/V
V/V
µA/V
µA
µA
COMP to Current Sense
Transconductance
Error Amp Voltage Gain
Error Amp Transconductance
Error Amp Min Source current
Error Amp Min Sink current
VIN UVLO Threshold
VIN UVLO Hysteresis
Soft-Start Time
(5)
Oscillator Frequency
Shutdown Supply Current
Quiescent Supply Current
Thermal Shutdown
Minimum Off Time
Minimum On Time
(5)
EN Up Threshold
EN Threshold Hysteresis
2.4
3.0
0.35
1.6
3.6
V
V
ms
0.7
1
12
140
150
100
100
1.3
20
MHz
µA
µA
°C
ns
ns
V
mV
130
1.8
1.3
1.55
320
Note:
5) Not production tested. Specified by design and bench characterization.
MPQ4561 Rev. 1.12
www.MonolithicPower.com
1/23/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
3
MPQ4561 – 1.5A, 2MHz, 55V STEP-DOWN CONVERTER
PIN FUNCTIONS
QFN
Pin #
1, 2
3
4
5
Name
SW
EN
COMP
FB
GND,
Exposed Pad
FREQ
SS
VIN
BST
Description
Switch Node. Output of the high-side switch. Requires a low V
F
Schottky rectifier to
ground. Place the rectifier close to the SW pins to reduce switching spikes..
Enable Input. Pull this pin below the specified threshold to shut the chip down. Pull it
above the specified threshold or leaving it floating to enable the chip.
Compensation. GM error amplifier output. Apply control-loop frequency compensation to
this pin.
Feedback. This is the input to the error amplifier. Connect an external resistive divider
connected between the output and GND. Compare to the internal +0.8V reference to set
the regulation voltage.
Ground. Connect as close as possible to the output capacitor and avoid high-current
switching paths. Connect the exposed pad to GND plane for optimal thermal
performance.
Switching Frequency Program Input. Connect a resistor from this pin to ground to set the
switching frequency.
Soft start programming mode. Connect a capacitor between SS and GND to set the soft
start time.
Input Supply. Supplies power to all the internal control circuitry, both BS regulators, and
the high-side switch. Place a decoupling capacitor to ground close to this pin to minimize
switching spikes.
Bootstrap. This is the positive power supply for the internal floating high-side MOSFET
driver. Connect a bypass capacitor between this pin and the SW pin.
6
7
8
9
10
MPQ4561 Rev. 1.12
www.MonolithicPower.com
1/23/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
4
MPQ4561 – 1.5A, 2MHz, 55V STEP-DOWN CONVERTER
TYPICAL CHARACTERISTICS
On Resistance vs.
Junction Temperature
500
450
3.4
3.2
3.2
3.0
Current Limit vs.
Junction Temperature
D=30%
I
PEAK_LIMIT
(A)
350
300
250
200
150
-50 -25
0
25
50
75 100 125
2.8
2.6
2.4
2.5
2.0
0
20
40
60
80
I
PEAK_LIMIT
(A)
400
3.0
2.8
2.6
2.4
2.2
2.0
1.8
-50 -25
0
25
50
75 100 125
Voltage Reference vs.
Junction Temperature
0.810
3.25
3.20
3.15
3.10
3.05
3.00
2.95
V
IN
Start-up vs.
Junction Temperature
2.73
V
IN
Shut-down vs.
Junction Temperature
V
IN
SHUT-DOWN VOLTAGE (V)
2.70
2.67
2.64
2.61
2.58
2.55
-50 -25
VOLTAGE REFERENCE (V)
0.805
0.800
0.795
0.790
0.785
0.780
-50 -25
V
IN
START-UP VOLTAGE (V)
0
25
50
75 100 125
2.90
-50 -25
0
25
50
75 100 125
0
25
50
75 100 125
Venable-high vs.
Junction Temperature
1.75
1.26
Venable-low vs.
Junction Temperature
1.25
1.24
1.23
1.22
1.21
-50 -25
2000
Frequency vs.
F
REQ
Resistor
V
EN
HIGH VOLTAGE (V)
1.65
1.60
1.55
1.50
1.45
1.40
1.35
1.30
-50 -25
0
25
50
75 100 125
V
EN
LOW VOLTAGE (V)
1.70
SWITCHING FREQUENCY (kHz)
0
25
50
75 100 125
1500
1000
500
0
0
100
200
300
400
500
MPQ4561 Rev. 1.12
www.MonolithicPower.com
1/23/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
5
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