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PDF MP2149 Data sheet ( Hoja de datos )
| Número de pieza | MP2149 | |
| Descripción | SYNC Buck Regulator | |
| Fabricantes | MPS | |
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The Future of Analog IC Technology
MP2149
6V, 1A, Low Quiescent Current
Dual, SYNC Buck Regulator
DESCRIPTION
The MP2149 is an internally-compensated,
1MHz fixed-frequency, dual PWM, synchronous,
step-down regulator. The MP2149 operates
from a 2.7V-to-6V input, generates an output
voltage as low as 0.608V, and has a 45µA
quiescent current that makes it ideal for
powering portable equipment that runs on a
single cell lithium-ion (Li+) battery.
The MP2149 integrates dual 100mΩ high-side
switches and 40mΩ synchronous rectifiers for
high efficiency without an external Schottky
diode. Peak-current mode control and internal
compensation limits the minimum number of
readily-available external components.
Fault-condition protections include cycle-by-cycle
current limiting and thermal shutdown.
The MP2149 is available in an 8-pin TSOT23-8
package.
FEATURES
• Dual 1A-Output Current
• >93% Peak Efficiency
• >80% Light-Load Efficiency
• Wide 2.7V-to-6V Operating Input Range
• 100mΩ and 40mΩ Internal Power MOSFET
• 1MHz Fixed Switching Frequency
• Adjustable Output from 0.608V to VIN
• 180° Phase-Shifted Operation
• 100% Duty-Cycle Operation
• 45µA Quiescent Current
• Cycle-by-Cycle Over-Current Protection
• Short-Circuit Protection with Hiccup Mode
• Thermal Shutdown
• Available in an 8-pin TSOT23-8 Package
APPLICATIONS
• Small/Handhold Devices
• DVD Drivers
• Portable Instruments
• Smartphones and Feature Phones
• Battery-Powered Devices
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Registered Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
VIN
5V
EN1
VOUT1
1.8V
COUT1
22µF
CIN
22µF
L1
1.5uH
R1
806kO
EN1 IN EN2
SW1 SW2
MP2149
FB1 GND FB2
L2
1.5uH
R3
806kO
EN2
VOUT2
1.2V
COUT 2
22µF
R2
412kO
R4
825kO
100
90
80
70
60
50
40
30
0.01
0.1
1
MP2149 Rev.1.01
5/31/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
1
1 page  
MP2149 –6V, 1A, LOW QUIESCENT CURRENT, DUAL, SYNC BUCK REGULATOR
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 5V, VOUT1 = 1.8V, VOUT2 = 1.2V, L = 1.5µH, COUT1=COUT2=22µF, TA = 25°C, unless otherwise
noted.
VOUT1/AC
20mV/div.
VOUT2/AC
20mV/div.
VOUT1/AC
10mV/div.
SW1
5V/div.
VOUT2/AC
10mV/div.
SW2
5V/div.
VOUT1
1V/div.
VOUT2
1V/div.
VIN
5V/div.
VOUT1
1V/div.
VOUT2
1V/div.
VIN
5V/div.
VOUT1
1V/div.
VOUT2
1V/div.
VIN
5V/div.
VOUT1
1V/div.
VOUT2
1V/div.
VIN
5V/div.
VOUT1
1V/div.
VOUT2
1V/div.
EN
5V/div.
VOUT1
1V/div.
VOUT2
1V/div.
EN
5V/div.
VOUT1
1V/div.
VOUT2
1V/div.
EN
5V/div.
MP2149 Rev.1.01
5/31/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
5
5 Page 
MP2149 –6V, 1A, LOW QUIESCENT CURRENT, DUAL, SYNC BUCK REGULATOR
• Switching Loss (SW)
• MOSFET Driver Current (DR)
• Supply Current (S)
Based on these parameters, we can estimate the
power loss as:
PLOSS = PCond + PDT + PSW + PDR + PS
Thermal Regulation
As previously discussed, changes in IC
temperature change the electrical characteristics,
especially when the temperature exceeds the
IC’s recommended operating range. Managing
the IC’s temperature requires additional
considerations to ensure that the IC runs below
the maximum-allowable temperature. While
operating the IC within recommended electrical
limits is a major component to maintaining proper
thermal regulation, specific layout designs can
improve the thermal profile while limiting costs to
either efficiency or operating range.
For the MP2149, connect the ground pin on the
package to a GND plane on top of the PCB to
use this plane as a heat sink. Connect this GND
plane to GND planes beneath the IC using vias
to further improve heat dissipation. However,
given that these GND planes can introduce
unwanted EMI noise and occupy valuable PCB
space, design the size and shape of these planes
to match the thermal resistance requirement:
θSA = θJA − θJC
However, connecting the GND pin to a heat sink
can not guarantee that the IC will not exceed its
recommended temperature limits; for instance, if
the ambient temperature exceeds the IC’s
temperature limits. If the ambient air temperature
approaches the IC’s temperature limit, options
such as derating the IC so it operates using less
power can help prevent thermal damage and
unwanted electrical characteristics.
PCB Layout
Proper layout of the switching power supplies is
very important, and sometimes critical for proper
function: poor layout design can result in poor
line or load regulation and stability issues.
Place the high-current paths (GND, IN and SW)
very close to the device with short, direct, and
wide traces. Place the input capacitor as close as
possible to the IN and GND pins. Place the
external feedback resistors next to the FB pin.
Keep the switching node SW short and away
from the feedback network. The circuit of below
PCB layout is shown in Figure 4.
R4
R3
AGND
R1
R2
VIN
EN2
SW 2
EN1
1
2
3
4
8
7
6 C1A C1B
5
SW 1
C5
C3
OUT2 C6
GND C4
OUT1
Figure 3: Suggested PCB Layout
Design Example
Below is a design example following
application guidelines for the specifications:
the
Table 3: Design Example
VIN 5V
VOUT1
1.8V
VOUT2
1.2V
The detailed application schematic is shown in
Figure 1. The typical performance and circuit
waveforms have been shown in the Typical
Performance Characteristics section. For more
device applications, please refer to the related
Evaluation Board Datasheets.
MP2149 Rev.1.01
5/31/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MP2149.PDF ] | |
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