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PDF MP2205A Data sheet ( Hoja de datos )
| Número de pieza | MP2205A | |
| Descripción | 1.3MHz Synchronous Step-Down Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
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The Future of Analog IC Technology
DESCRIPTION
The MP2205A is an internally compensated
1.3MHz fixed frequency PWM synchronous
step-down regulator with a 3V to 6V bias supply
(VCC). MP2205A operates from a 3V to 16V
input and generates an adjustable output
voltage from 0.8V to 0.9xVIN at up to 2.5A load
current.
The MP2205A integrates an 80mΩ high-side
switch and an 80mΩ synchronous rectifier for
high efficiency without an external Schottky
diode. With peak current mode control and
internal compensation, it is stable with a output
ceramic capacitor and a small inductor. Fault
protection includes hiccup short-circuit
protection, cycle-by-cycle current limiting and
thermal shutdown. Other features include
frequency synchronization and internal soft-
start.
The MP2205A is available in a small 3mm x
4mm 14-lead QFN packages.
MP2205A
16V, 2.5A, 1.3MHz Synchronous
Step-Down Converter
FEATURES
• 2.5A Output Current
• Input Supply Range: 3V to 16V
• 80mΩ Internal Power MOSFET Switches
• All Ceramic Output Capacitors Design
• Up to 95% Efficiency
• 1.3MHz Fixed Switching Frequency
• Adjustable Output from 0.8V to 0.9xVIN
• Internal Soft-Start
• Power Good Pin
• Frequency Synchronization Input
• Thermal Shutdown
• Cycle-by-Cycle Current Limiting
• Hiccup Short Circuit Protection
• 14-Lead, 3mm x 4mm QFN Package
APPLICATIONS
• µP/ASIC/DSP/FPGA Core and I/O Supplies
• Printers and LCD TVs
• Network and Telecom Equipment
• Point of Load Regulators
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
VIN
3V to 16V
VCC
3V to 6V
OFF ON
C1
33uF
C4
1uF
5,10 7
IN
8
VCC
BS
SW
4,11
MP2205A
13 EN/SYNC
POK
9
GND
FB
14
1,3,12
C3
100nF
L1
1uH
C6
560PF
VOUT
1.8V / 2.5A
C2
47uF
MP2205A Rev. 0.9
9/1/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
1
Free Datasheet http://www.datasheet4u.com/
1 page  
MP2205A – 16V, 2.5A, 1.3MHz SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
VOUT = 1.8V, TA = +25ºC, unless otherwise noted.
MP2205A Rev. 0.9
9/1/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
MP2205A – 16V, 2.5A, 1.3MHz SYNCHRONOUS STEP-DOWN CONVERTER
Output Capacitor Selection
The output capacitor keeps output voltage ripple
small and ensures regulation loop stable. The
output capacitor impedance shall be low at the
switching frequency. Ceramic capacitors with
X5R or X7R dielectrics are recommended. If
electrolytic capacitor is used, pay attention to
output ripple voltage, extra heating, and the
selection of feedback resistor R1 (refer to “Output
Voltage Setting” section) due to large ESR of
electrolytic capacitor. The output ripple ∆VOUT is
approximately:
ΔVOUT
≤
VOUT x(VIN − VOUT )
VIN xfOSC xL
x(ESR
+
1)
8 xfOSC xC3
External Schottky Diode
For this part, an external schottky diode is
recommended to be placed close to "SW" and
"GND" pins, especially when the output current is
larger than 2A.
With the external schottky diode, the voltage
spike and negative kick on "SW" pin can be
minimized; moreover, the conversion efficiency
can also be improved a little.
For the external schottky diode selection, it's
noteworthy that the maximum reverse voltage
rating of the external diode should be larger than
the maximum input voltage. As for the current
rating of this diode, 0.5A rating should be sufficient.
PC Board Layout
PCB layout is very important to achieve stable
operation. It is highly recommended to duplicate
EVB layout for optimum performance. If change
is necessary, please follow these guidelines as
follows. Here, the typical application circuit is
taken as an example to illustrate the key layout
rules should be followed.
1) For MP2205A, a PCB layout with >=4 layers is
recommended.
2) The high current paths (GND, IN and SW)
should be placed very close to the device with
short, direct and wide traces.
3) Two input ceramic capacitors (2 x
(10μF~22μF)) are strongly recommended to be
placed on both sides of the MP2205ADL
package and keep them as close as possible to
the “IN” and “GND” pins.
4) A RC low pass filter is recommended for VCC
supply. The VCC decoupling capacitor must be
placed as close as possible to “VCC” pin and
“GND” pin.
5) The external feedback resistors shall be
placed next to the FB pin. Keep the FB trace as
short as possible.
6) Keep the switching node SW short and away
from the feedback network.
MP2205A Rev. 0.9
9/1/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
11
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11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MP2205A.PDF ] | |
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