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 respon and eas 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 expod pad.
FEATURES
• Wide 4.5V to 30V Operating Input Range
• 5A Output Current
• 50m Ω 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
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• Available in 8-Pin SOIC Package and
Thermally Enhanced 8-Pin SOIC Package
APPLICATIONS
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• Digital Set Top Boxes
• Personal Video Recorders • Broadband Communications • Flat Panel Television and Monitors
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
Efficiency vs Output Current
V OUT =3.3V
E F F I C I E N C Y (%)
OUTPUT CURRENT (A)
1
2345
70
7580859095
100
ORDERING INFORMATION
Part Number Package Top Marking Free Air Temperature(T A) MP2482DN* SOIC8E MP2482DN
MP2482DS** SOIC8 MP2482DS
-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
ABSOLUTE MAXIMUM RATINGS (1) Supply Voltage 32V -0.3V(-5V for < 10ns) to 33V V BS .......................................................V SW + 6V All -0.3V to +6V Continuous Power Dissipation (T A = +25°C) (2) 2.1.4W 150°C 260°C -65°C to +150°C Recommended Operating Conditions (3) Supply Voltage 4.5V to 30V Operating Junct. Temp (T J)......-40°C to +125°C Thermal Resistance (4)θJA θJC
屌丝之歌<50......10...°C/W SOIC8…………………………..90……45…°C/W Notes:
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1) Exceeding the 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 θJA, 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)/θJA. Exceeding the maximum allowable p
ower dissipation will cau 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.
ELECTRICAL CHARACTERISTICS
V IN = 12V, T A = +25°C, unless otherwi noted.
Max
Units
Min
Typ
Parameters Symbol Condition
Feedback Voltage V FB 4.5V ≤ V IN≤ 30V 0.788 0.808 0.828V
Feedback Current I FB V FB = 0.8V 10 nA
鸡字开头的成语Switch On Resistance (5)R DS(ON)50 mΩ
Switch Leakage V EN = 0V, V SW = 0V0 10 μA
9
A Current Limit (5)7.5
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Oscillator Frequency f SW V FB = 0.6V 310 420 530 kHz
Fold-back Frequency V FB = 0V 25 115 205 kHz
Maximum Duty Cycle V FB = 0.6V 85 90 %
Minimum On Time t ON100 ns
Under Voltage Lockout Threshold Rising 3.9 4.1 4.3 V
Under Voltage Lockout Threshold Hysteresis880 mV
EN Input Low Voltage 0.4 V
EN Input High Voltage 1.5 V
V EN = 2V 2
μA
EN Input Current
V EN = 0V 0
Sync Frequency Range (Low) F SYNCL300 kHz
Sync Frequency Range (High) F SYNCH 1.5 MHz
Enable Turnoff Delay T OFF 5.0 μs
Supply Current (Shutdown) V EN= 0V 0 μA
Supply Current (Quiescent) V EN= 2V, V FB = 1V0.9 1.1 mA
Thermal Shutdown 150 °C
Power Good Control
Power Good Threshold Rising 0.69 0.74 0.79 V
Power Good Threshold Hysteresis 40 mV
PG Pin Level V PG PG Sink 4mA 0.4 V
Note:
5) Guaranteed by design.
PIN FUNCTIONS
Pin #
Name
Description
1 SW Switch Output.
2 BST Bootstrap. This capacitor is needed to drive the power switch’s gate above the supply
voltage. It is connected between SW and BS pins to form a floating supply across the power
switch driver.
3 VCC Bias Supply. Decouple this pin with a 1µF ceramic capacitor.
4 GND Ground. This pin is the voltage reference for the regulated output voltage. For this reason
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 noi into the part.
5 FB
Feedback. An external resistor divider from the output to GND, tapped to the FB pin ts the output voltage. To prevent current limit run away during a short circuit fault condition the
frequency foldback comparator lowers the oscillator frequency when the FB voltage is below 250mV.
6 PG Power Good Indicator. Connect this pin to V CC or V OUT by a 100k Ω pull-up resistor. The
output of this pin is low if the output voltage is 10% less than the nominal voltage, otherwi
it is an open drain.
7 EN/SYNC On/Off Control Input and Synchronization Pin.
8 IN
Supply Voltage. The MP2482 operates from a +4.5V to +30V unregulated input. C1 is
needed to prevent large voltage spikes from appearing at the input.
TYPICAL PERFORMANCE CHARACTERISTICS
V IN = 12V, V OUT = 3.3V, I OUT = 5A, T A = +25ºC, unless otherwi noted.
P E A K C U R R E N T (A )
DUTY CYCLE (%)
Peak Current vs Duty Cycle
Efficiency vs Output Current
O U T P U T V O L T A G E (V )
INPUT VOLTAGE(V)
Operating Range
E F F I C I E N C Y (%)
1234560
10
2050306070
40OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
Ca Temperature vs Output Current
Disabled Supply Current vs Input Voltage
100
203040
10
203040
4020
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1
2345
对证
Enabled Supply Current vs Input Voltage V C C (V )
V CC Regulator Line Regulation
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Line Regulation
N O R M A L I Z E D O U T P U T V O L T A G E
N O R M A L I Z E D O U T P U T V O L T A G E
OUTPUT CURRENT (A)
Load Regulation
12345
0.1
1
10
100
3.5
3.73.9
4.14.34.5
4.74.930
800
850900950
70
7580859095
100 6.06.57.07.58.08.59.0
9.5INPUT VOLTAGE (V)
