MP2560
2.5A, 4MHz, 42V
Step-Down Converter
The Future of Analog IC Technology
DESCRIPTION
The MP2560 is a high frequency step-down
switching regulator with an integrated internal
high-side high voltage power MOSFET. It
provides 2.5A output with current mode control for
fast loop response and easy compensation.
The wide 4.5V to 42V input range accommodates
a variety of step-down applications, including
those in an automotive input environment. A 12µA
shutdown mode quiescent current allows use in
battery-powered applications.
High power conversion efficiency over a wide
load range is achieved by scaling down the
switching frequency at light load condition to
reduce the switching and gate driving losses.
The frequency foldback helps prevent inductor
current runaway during startup and thermal
shutdown provides reliable, fault tolerant
operation.
By switching at 4MHz, the MP2560 is able to
prevent EMI (Electromagnetic Interference) noise
problems, such as those found in AM radio and
ADSL applications.
The MP2560 is available in small 3mm x 3mm
QFN10 and thermally enhanced SOIC8 packages.
FEATURES
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120µA Quiescent Current
Wide 4.5V to 42V Operating Input Range
220mΩ Internal Power MOSFET
Up to 4MHz Programmable Switching
Frequency
Stable with Ceramic Capacitor
Internal Soft-Start
Internally Set Current Limit without external
Current Sensing Resistor
Up to 93% Efficiency
Output Adjustable from 0.8V to 39V
Available in 3x3 QFN10 and Thermally
Enhanced SOIC8 Packages
High Voltage Power Conversion
Automotive Systems
Industrial Power Systems
Distributed Power Systems
Battery Powered Systems
APPLICATIONS
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“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
95
10
V
IN
8,9
VIN
BST
SW
1,2
D1
EN
3
EN
FB
5
V
OUT
3.3V
Efficiency vs.
Load Current
V
IN
=12V V
IN
=8V
90
85
EFFICIENCY (%)
80
75
70
65
60
55
50
0
V
IN
=24V
V
IN
=36V
MP2560
7
FREQ
GND
6
COMP
4
C6
NS
V
OUT
=3.3V
fs=500kHz
1.5
0.5
1
2
LOAD CURRENT (A)
2.5
MP2560 Rev. 1.2
1/25/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
1
MP2560 – 2.5A, 4MHz, 42V STEP-DOWN CONVERTER
ORDERING INFORMATION
Part Number*
MP2560DQ
MP2560DN
Package
3x3 QFN10
SOIC8E
Top Marking
S8YW
MP2560DN
Temperature
–40°C to +85°C
* For Tape & Reel, add suffix –Z (eg. MP2560DQ–Z). For RoHS Compliant Packaging, add suffix –LF (eg.
MP2560DQ–LF–Z)
** For Tape & Reel, add suffix –Z (eg. MP2560DN–Z). For RoHS Compliant Packaging, add suffix –LF (eg.
MP2560DN–LF–Z)
PACKAGE REFERENCE
TOP VIEW
SW
SW
EN
COMP
FB
1
2
3
4
5
10
9
8
7
6
BST
VIN
VIN
FREQ
GND
TOP VIEW
SW
EN
COMP
FB
1
2
3
4
8
7
6
5
BST
VIN
FREQ
GND
EXPOSED PAD
ON BACKSIDE
CONNECT TO GND
EXPOSED PAD
CONNECT TO GND
ABSOLUTE MAXIMUM RATINGS
(1)
Supply Voltage (V
IN
).....................–0.3V to +45V
Switch Voltage (V
SW
) ..........................................
............. –0.3V (-7V for < 10ns) to V
IN
+ 0.3V
BST to SW .....................................–0.3V to +6V
All Other Pins .................................–0.3V to +6V
Continuous Power Dissipation… (T
A
= +25°C)
(2)
3x3 QFN10 ................................................ 2.5W
SOIC8 ........................................................ 2.5W
Junction Temperature ...............................150°C
Lead Temperature ....................................260°C
Storage Temperature.............. –65°C to +150°C
Thermal Resistance
(4)
3x3 QFN10 ............................. 50 ...... 12...
°C/W
SOIC8 (Exposed Pad) ............ 50 ...... 10...
°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.
θ
JA
θ
JC
Recommended Operating Conditions
(3)
Supply Voltage V
IN
...........................4.5V to 42V
Output Voltage V
OUT
.........................0.8V to 39V
Operating Temperature............. –40°C to +85°C
MP2560 Rev. 1.2
1/25/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
2
MP2560 – 2.5A, 4MHz, 42V STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
V
IN
= 12V, V
EN
= 2.5V, V
COMP
= 1.4V, T
A
= +25°C, unless otherwise noted.
Parameter
Feedback Voltage
Upper Switch On Resistance
Upper Switch Leakage
Current Limit
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
Oscillator Frequency
Shutdown Supply Current
Quiescent Supply Current
Thermal Shutdown
Thermal Shutdown Hysteresis
Minimum Off Time
(6)
Minimum On Time
(6)
EN Up Threshold
EN Threshold Hysteresis
Symbol Condition
V
FB
R
DS(ON)
4.5V < V
IN
< 42V
V
BST
– V
SW
= 5V
V
EN
= 0V, V
SW
= 0V, V
IN
= 42V
Duty Cycle = 50%
Min
0.776
Typ
0.8
220
1
3.5
8
I
COMP
= ±3µA
V
FB
= 0.7V
V
FB
= 0.9V
40
200
60
5
–5
3.0
0.4
1.3
(5)
2
4
12
120
150
15
100
100
1.5
300
80
Max
0.824
Units
V
mΩ
µA
A
A/V
V/V
µA/V
µA
µA
V
V
ms
MHz
MHz
µA
µA
°C
°C
ns
ns
V
mV
2.9
G
CS
2.7
10% < V
OUT
< 90%
R
FREQ
= 45kΩ
R
FREQ
= 18kΩ
V
EN
= 0V
No load, V
FB
= 0.9V
3.3
1.6
3.2
2.4
4.8
20
145
1.3
1.7
Note:
5) The Soft-Start Time is measured based on V
OUT
from 10% to 90% and multiplied by 1.25 to get 0% to 100% Soft-Start Time.
6) Guaranteed by design.
MP2560 Rev. 1.2
1/25/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
3
MP2560 – 2.5A, 4MHz, 42V STEP-DOWN CONVERTER
PIN FUNCTIONS
QFN
Pin #
1, 2
3
4
5
SOIC8
Pin #
1
2
3
4
Name
SW
EN
COMP
FB
Description
Switch Node. This is the output from the high-side switch. A low forward drop
Schottky diode to ground is required. The diode must be close to the SW pins to
reduce switching spikes.
Enable Input. Pulling this pin below the specified threshold shuts the chip down.
Pulling it up above the specified threshold or leaving it floating enables the chip.
Compensation. This node is the output of the error amplifier. Control loop frequency
compensation is applied to this pin.
Feedback. This is the input to the error amplifier. The output voltage is set by a
resistive divider connected between the output and GND which scales down V
OUT
equal to the internal +0.8V reference.
6
7
8, 9
10
5
6
7
8
GND,
Ground. It should be connected as close as possible to the output capacitor to
Exposed
shorten the high current switch paths. Connect exposed pad to ground plane.
Pad
Switching Frequency Program Input. Connect a resistor from this pin to ground to set
FREQ
the switching frequency.
Input Supply. This supplies power to all the internal control circuitry, both BS
VIN
regulators and the high-side switch. A decoupling capacitor to ground must be placed
close to this pin to minimize switching spikes.
Bootstrap. This is the positive power supply for the internal floating high-side
BST
MOSFET driver. Connect a bypass capacitor between this pin and SW pin.
MP2560 Rev. 1.2
1/25/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
4
MP2560 – 2.5A, 4MHz, 42V STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
= 12V, V
OUT
=5V, C1 = 10µF, C2 = 22µF, L1 = 10µH and T
A
= +25°C, unless otherwise noted.
Efficiency vs
Load Current
100
V
IN
=5V
90
V
IN
=12V
OSCILLATIONG EFFICIENCY (KHz)
100
90
Efficiency vs
Load Current
4000
3500
3000
2500
2000
1500
1000
500
0
Oscillating Frequency
vs R
freq
EFFICIENCY (%)
EFFICIENCY (%)
80
70
60
50
40
0
V
IN
=12V
80
70
60
50
40
0
V
IN
=24V
V
IN
=24V
V
OUT
=2.5V
fs=500kHz
0.5
1.0
1.5
2.0
LOAD CURRENT (A)
2.5
V
OUT
=5V
fs=500kHz
0.5
1.0
1.5
2.0
LOAD CURRENT (A)
2.5
10
100
1000
Steady State
I
OUT
= 0.1A
Steady State
I
OUT
= 1A
Steady State
I
OUT
= 2A
V
OUT
AC Coupled
10mV/div.
V
OUT
AC Coupled
20mV/div.
V
OUT
AC Coupled
20mV/div.
V
SW
10V/div.
I
L
1A/div.
V
SW
10V/div.
V
SW
10V/div.
I
L
1A/div.
I
L
2A/div.
MP2560 Rev. 1.2
1/25/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
5
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