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PDF MP2360 Data sheet ( Hoja de datos )
| Número de pieza | MP2360 | |
| Descripción | 1.4MHz Step-Down Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
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TM
The Future of Analog IC Technology TM
DESCRIPTION
The MP2360 is a monolithic step-down switch
mode converter with a built-in internal power
MOSFET. It achieves 1.8A 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 MP2360 requires a minimum number of
readily available standard external components.
The MP2360 is available in a 2mm x 2mm QFN8
package.
EVALUATION BOARD REFERENCE
Board Number
Dimensions
EV2360DG-00B
1.8”X x 1.6”Y x 0.4”Z
MP2360
1.8A, 24V, 1.4MHz
Step-Down Converter
FEATURES
• 2.5A Peak Output Current
• 1.8A Continuous Output Current
• 0.3Ω Internal Power MOSFET Switch
• Stable with Low ESR Output Ceramic
Capacitors
• 0.1µA Shutdown Mode
• Fixed 1.4MHz Frequency
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Wide 4.5V to 24V Operating Input Range
• Output Adjustable from 0.81V to 15V
• Available in 2x2 QFN8 Packages
APPLICATIONS
• Broadband Communications Equipment
• Digital Entertainment Systems
• Distributed Power Systems
• Battery Charger
• Pre-Regulator for Linear Regulators
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
VIN
OFF ON
3
IN
7
BST
CB
10nF
2
MP2360 SW
D1
B230A
4 EN
GND
6
5
FB
VOUT
3.3V
Efficiency vs
Load Current
100
90 VOUT = 3.3V
80 VOUT = 2.5V
70
60
VIN = 12V
50
0
0.5 1.0 1.5 2.0
LOAD CURRENT (A)
MP2360 Rev. 0.9
8/21/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
1
1 page  
TM MP2360 – 1.8A, 24V, 1.4MHz STEP-DOWN CONVERTER
OPERATION
The MP2360 is a current mode buck regulator.
That is, the EA output voltage is proportional to
the peak inductor current.
At the beginning of a cycle, M1 is off. The EA
output voltage is higher than the current sense
amplifier output, and the current comparator’s
output is low. The rising edge of the 1.4 MHz
CLK signal sets the RS Flip-Flop. Its output
turns on M1 thus connecting the SW pin and
inductor to the input supply.
The increasing inductor current is sensed and
amplified by the Current Sense Amplifier. Ramp
compensation is summed to Current Sense
Amplifier output and compared to the Error
Amplifier output by the PWM Comparator.
When the sum of the Current Sense Amplifier
output and the Slope Compensation signal
exceeds the EA output voltage, the RS Flip-
Flop is reset and the M1 is turned off. The
external Schottky rectifier diode (D1) conducts
the inductor current.
If the sum of the Current Sense Amplifier output
and the Slope Compensation signal does not
exceed the EA output for a whole cycle, then
the falling edge of the CLK resets the Flip-Flop.
The output of the Error Amplifier integrates the
voltage difference between the feedback and
the 0.81V bandgap reference. The polarity is
such that a FB pin voltage lower than 0.8V
increases the EA output voltage. Since the EA
output voltage is proportional to the peak
inductor current, an increase in its voltage also
increases current delivered to the output.
IN
EN
FB
GND
D
x20
CURRENT SENSE
AMPLIFIER
REGULATOR
REFERENCE
OSCILLATOR
1.4MHz
1pF
27pF
-+-EA
ERROR
AMPLIFIER
REGULATOR
SQ
+
--
CURRENT
LIMIT
COMPARATOR
R
R
DRIVER
+
--
PWM
COMPARATOR
BST
M1
SW
Figure 1—Functional Block Diagram
MP2360 Rev. 0.9
8/21/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MP2360.PDF ] | |
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