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PDF MP2208 Data sheet ( Hoja de datos )
| Número de pieza | MP2208 | |
| Descripción | 600kHz Synchronous Step-Down Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MP2208 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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The Future of Analog IC Technology
DESCRIPTION
The MP2208 is an internally compensated
600kHz fixed frequency PWM synchronous
step-down regulator. With a 3V to 6V bias
supply, MP2208 operates from a 3V to 16V
input and generates an adjustable output
voltage from 0.8V to 0.9xVIN at up to 4A load
current.
The MP2208 integrates a 80mΩ high-side
switch and a 80mΩ synchronous rectifier for
high efficiency without an external Schottky
diode. With peak current mode control and
internal compensation, it can be stabilized with
ceramic capacitors and small inductors. Fault
condition protection includes short-circuit
protection, cycle-by-cycle current limiting and
thermal shutdown.
The MP2208 is available in small 3mmx4mm
14-lead QFN packages.
MP2208
16V, 4A, 600kHz Synchronous
Step-Down Converter
FEATURES
4A Output Current
Input Supply Range: 3V to 16V
80mΩ Internal Power MOSFET Switches
Stable with Ceramic Output Capacitors
High Efficiency
600kHz Fixed Switching Frequency
Adjustable Output from 0.8V to 0.9xVIN
Frequency Synchronization
Power Good Pin
Thermal Shutdown
Cycle-by-Cycle Current Limiting
Short Circuit Protection
3mmx4mm 14-lead 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
5, 10
7
IN BS
8 VCC
SW
MP2208
13 EN/SYNC
9 POK
FB
4, 11
14
SS AGND/PGND
2
C6
10nF
1, 3, 12
VOUT
1.8V / 4A
Efficiency vs.
Load Current
100 VIN=8V
95
VIN=12V
90
VIN=16V
85
80
75
0
VOUT=3.3V
VCC=5V
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
LOAD CURRENT (A)
MP2208 Rev. 0.92
www.MonolithicPower.com
5/7/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
1
Free Datasheet http://www.datasheet4u.com/
1 page  
MP2208 – 16V, 4A, 600KHz SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
VCC = 5V, VOUT = 1.8V, TA = +25ºC, unless otherwise noted.
Switching Waveform
VIN=5V,IO=0A
Switching Waveform
VIN=12V,IO=0A
VO/AC
10mV/div.
VO/AC
10mV/div.
VSW
2V/div.
IL
500mA/div.
VSW
5V/div.
500mA/div.
Switching Waveform
VIN=5V,IO=4A
VO/AC
10mV/div.
VSW
2V/div.
IL
5A/div.
Enable Start-up
VIN=12V,IO=0A
VEN
5V/div.
VO
1V/div.
VSW
10V/div.
IL
2A/div.
Switching Waveform
VIN=12V,IO=4A
VO/AC
10mV/div.
VSW
5V/div.
IL
5A/div.
Enable Start-up
VIN=12V,IO=4A
VEN
5V/div.
VO
1V/div.
VSW
10V/div.
IL
5A/div.
MP2208 Rev. 0.92
www.MonolithicPower.com
5/7/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
MP2208 – 16V, 4A, 600KHz 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.
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.
PCB Layout Guide
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 MP2208, 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 MP2208DL
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.
MP2208 Rev. 0.92
www.MonolithicPower.com
5/7/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MP2208.PDF ] | |
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