MP2482
5A, 30V, 420kHz
Step-Down Converter
The Future of Analog IC Technology
DESCRIPTION
The MP2482 is a monolithic step-down switch
mode converter with a built in internal power
MOSFET. It achieves 5A continuous output
current over a wide input supply range with
excellent load and line regulation.
Current mode operation provides fast transient
response and eases loop stabilization.
Fault condition protection includes cycle-by-cycle
current limiting and thermal shutdown.
The MP2482 requires a minimum number of
readily available standard external components
and is available in 8-pin SOIC package with and
without exposed pad.
FEATURES
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•
•
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Wide 4.5V to 30V Operating Input Range
5A Output Current
50mΩ Internal Power MOSFET Switch
Power Good Indicator
Fixed 420kHz Frequency
Synchronizable up to 1.5MHz
Cycle-by-Cycle Over Current Protection with
hiccup
Thermal Shutdown
Output Adjustable from 0.81V
Stable with Low ESR Output Ceramic
Capacitors
Available in 8-Pin SOIC Package and
Thermally Enhanced 8-Pin SOIC Package
Digital Set Top Boxes
Personal Video Recorders
Broadband Communications
Flat Panel Television and Monitors
APPLICATIONS
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“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
V
IN
8
IN
BST
2
Efficiency vs Output Current
V
OUT
=3.3V
100
95
EFFICIENCY (%)
3
V
IN
=5V
V
IN
=12V
VCC
MP2482
6
PG
SW
1
V
OUT
3.3V @ 5A
D1
B530C
90
85
80
75
70
1
V
IN
=30V
OFF ON
V
CC 7
EN/SYNC
GND
4
FB
5
2
3
4
OUTPUT CURRENT (A)
5
MP2482 Rev.1.4
www.MonolithicPower.com
9/21/2011
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
Preliminary Specifications Subject to Change
© 2011 MPS. All Rights Reserved.
1
MP2482 – 5A, 30V, 420kHZ STEP-DOWN CONVERTER
ORDERING INFORMATION
Part Number
MP2482DN*
MP2482DS**
Package
SOIC8E
SOIC8
Top Marking
MP2482DN
MP2482DS
Free Air Temperature(T
A
)
-40°C to +85°C
* For Tape & Reel, add suffix –Z (eg. MP2482DN–Z).
For RoHS Compliant Packaging, add suffix –LF (eg. MP2482DN–LF–Z)
** For Tape & Reel, add suffix –Z (eg. MP2482DS–Z).
For RoHS Compliant Packaging, add suffix –LF (eg. MP2482DS–LF–Z)
PACKAGE REFERENCE
TOP VIEW
SW
BST
VCC
GND
1
2
3
4
8
7
6
5
IN
EN/SYNC
PG
FB
TOP VIEW
SW
BST
VCC
GND
1
2
3
4
8
7
6
5
IN
EN/SYNC
PG
FB
EXPOSED PAD
ON BACKSIDE
SOIC8E
SOIC8
(4)
Supply Voltage V
IN
....................................... 32V
V
SW
.........................-0.3V(-5V for < 10ns) to 33V
V
BS
....................................................... V
SW
+ 6V
All Other Pins ..................................-0.3V to +6V
(2)
Continuous Power Dissipation (T
A
= +25°C)
SOIC8E...................................................... 2.5W
SOIC8 ........................................................ 1.4W
Junction Temperature ...............................150°C
Lead Temperature ....................................260°C
Storage Temperature............... -65°C to +150°C
ABSOLUTE MAXIMUM RATINGS
(1)
Thermal Resistance
SOIC8E ...................................50 ...... 10 ...
°C/W
SOIC8…………………………..90……45…°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 PCB.
θ
JA
θ
JC
Recommended Operating Conditions
(3)
Supply Voltage V
IN
...........................4.5V to 30V
Operating Junct. Temp (T
J
)...... -40°C to +125°C
MP2482 Rev.1.4
www.MonolithicPower.com
9/21/2011
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
Preliminary Specifications Subject to Change
© 2011 MPS. All Rights Reserved.
2
MP2482 – 5A, 30V, 420kHZ STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
V
IN
= 12V, T
A
= +25°C, unless otherwise noted.
Parameters
Feedback Voltage
Feedback Current
Switch On Resistance
(5)
Switch Leakage
Current Limit
(5)
Oscillator Frequency
Fold-back Frequency
Maximum Duty Cycle
Minimum On Time
Under Voltage Lockout Threshold Rising
Under Voltage Lockout Threshold Hysteresis
EN Input Low Voltage
EN Input High Voltage
EN Input Current
Sync Frequency Range (Low)
Sync Frequency Range (High)
Enable Turnoff Delay
Supply Current (Shutdown)
Supply Current (Quiescent)
Thermal Shutdown
Power Good Control
Power Good Threshold Rising
Power Good Threshold Hysteresis
PG Pin Level
Note:
5) Guaranteed by design.
Symbol Condition
V
FB
4.5V
≤
V
IN
≤
30V
I
FB
V
FB
= 0.8V
R
DS(ON)
V
EN
= 0V, V
SW
= 0V
f
SW
V
FB
= 0.6V
V
FB
= 0V
V
FB
= 0.6V
Min
0.788
310
25
85
3.9
t
ON
Typ
0.808
10
50
0
7.5
420
115
90
100
4.1
880
Max
0.828
10
9
530
205
4.3
0.4
1.5
V
EN
= 2V
V
EN
= 0V
F
SYNCL
F
SYNCH
T
OFF
V
EN
=
0V
V
EN
=
2V, V
FB
= 1V
2
0
300
1.5
5.0
0
0.9
150
0.69
V
PG
PG Sink 4mA
0.74
40
Units
V
nA
mΩ
μA
A
kHz
kHz
%
ns
V
mV
V
V
μA
kHz
MHz
μs
μA
mA
°C
V
mV
V
1.1
0.79
0.4
MP2482 Rev.1.4
www.MonolithicPower.com
9/21/2011
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
Preliminary Specifications Subject to Change
© 2011 MPS. All Rights Reserved.
3
MP2482 – 5A, 30V, 420kHZ STEP-DOWN CONVERTER
PIN FUNCTIONS
Pin #
1
2
3
4
Name
SW
Description
Switch Output.
Bootstrap. This capacitor is needed to drive the power switch’s gate above the supply
BST
voltage. It is connected between SW and BS pins to form a floating supply across the power
switch driver.
VCC
Bias Supply. Decouple this pin with a 1µF ceramic capacitor.
Ground. This pin is the voltage reference for the regulated output voltage. For this reason
GND
care must be taken in its layout. This node should be placed outside of the D1 to C1 ground
path to prevent switching current spikes from inducing voltage noise into the part.
Feedback. An external resistor divider from the output to GND, tapped to the FB pin sets
the output voltage. To prevent current limit run away during a short circuit fault condition the
FB
frequency foldback comparator lowers the oscillator frequency when the FB voltage is
below 250mV.
Power Good Indicator. Connect this pin to V
CC
or V
OUT
by a 100kΩ pull-up resistor. The
PG
output of this pin is low if the output voltage is 10% less than the nominal voltage, otherwise
it is an open drain.
EN/SYNC On/Off Control Input and Synchronization Pin.
Supply Voltage. The MP2482 operates from a +4.5V to +30V unregulated input. C1 is
IN
needed to prevent large voltage spikes from appearing at the input.
5
6
7
8
MP2482 Rev.1.4
www.MonolithicPower.com
9/21/2011
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
Preliminary Specifications Subject to Change
© 2011 MPS. All Rights Reserved.
4
MP2482 – 5A, 30V, 420kHZ STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 5A, T
A
= +25ºC, unless otherwise noted.
Efficiency vs
Output Current
100
95
V
IN
=5V
V
IN
=12V
1100
1050
1000
950
V
IN
=30V
900
850
1
2
3
4
OUTPUT CURRENT (A)
5
800
0
Enabled Supply Current
vs Input Voltage
Disabled Supply Current
vs Input Voltage
0.35
0.30
0.25
0.20
EFFICIENCY (%)
90
85
80
75
70
0.15
0.10
V
FB
=1V
10
20
30
INPUT VOLTAGE (V)
40
0.05
0
V
EN
=0V
0
20
30
10
INPUT VOLTAGE (V)
40
V
CC
Regulator Line
Regulation
70
4.9
4.7
4.5
60
50
40
30
20
10
I
CC
=10mA
0
5
10
15
20 25
INPUT VOLTAGE (V)
30
0
Case Temperature vs
Output Current
100
Operating Range
OUTPUT VOLTAGE (V)
V
OUT
<V
IN
-3V
10
V
CC
(V)
4.3
4.1
3.9
3.7
3.5
1
Minimum On
Time Limit
0.1
0
5
10 15 20 25 30
INPUT VOLTAGE(V)
35
0
1
2
3
4
5
OUTPUT CURRENT (A)
6
Load Regulation
NORMALIZED OUTPUT VOLTAGE
V
IN
=30V
V
IN
=12V
Line Regulation
NORMALIZED OUTPUT VOLTAGE
1.00035
1.00030
1.00025
1.00020
1.00015
1.00010
1.00005
1.00000
0.99995
5
9
I=5A
13 17 21 25 29
INPUT VOLTAGE (V)
33
9.5
9.0
Peak Current vs
Duty Cycle
1.005
1.000
0.995
0.990
0.985
0.980
0
PEAK CURRENT (A)
8.5
8.0
7.5
7.0
6.5
6.0
20
40
60
80
DUTY CYCLE (%)
100
1
2
3
4
OUTPUT CURRENT (A)
5
MP2482 Rev.1.4
www.MonolithicPower.com
9/21/2011
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
Preliminary Specifications Subject to Change
© 2011 MPS. All Rights Reserved.
5
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