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PDF MP2499 Data sheet ( Hoja de datos )
| Número de pieza | MP2499 | |
| Descripción | 100kHz Step Down Regulator | |
| Fabricantes | MPS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MP2499 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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The Future of Analog IC Technology
MP2499
Integrated 100V Load Dump Protection
2A, 100kHz Step Down Regulator with
Programmable Output Current
DESCRIPTION
The MP2499 is a monolithic step-down switch
mode converter with a programmable output
current limit and an integrated input over-
voltage protection switch. It achieves 2.0A
continuous output current over a wide input
supply range with excellent load and line
regulation.
The maximum output current can be
programmed by sensing current through the
inductor DC resistance (DCR) or an accurate
sense resistor.
Fault condition protection includes cycle-by-cycle
current limiting and thermal shutdown.
The MP2499 can survive high-voltage transients
such as those found in automotive and industrial
applications.
The MP2499 requires a minimum number of
readily available standard external components.
The MP2499 is available in a 16-pin SOIC
package.
FEATURES
• Replaces External Transorb
• Supports 12V/24V Systems
• Input Surge Protection Up to 100V
• Programmable Output Current up to 2.0A
• Output Adjustable
• Fixed 100kHz Frequency
• 0.25Ω Internal Power MOSFET Switch
• Stable with Low ESR Output Ceramic
Capacitors
• 92% Efficiency @ 500mA (Vo=5V)
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Available in a 16-Pin SOIC Package
APPLICATIONS
• 12V/24V Systems with High Input Surge
• Automotive Cigarette Lighter Adapters
• Power Supply for Linear Chargers
• Industrial Power Supplies
• Avionics
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
MP2499 Rev. 0.91
11/24/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
1
1 page  
MP2499– INTEGRATED 100V LOAD DUMP PROTECTION, 2A STEP DOWN REGULATOR
TYPICAL PERFORMANCE CHARACTERISTICS
C1=220µF, C2=2.2µF, C3=39µF, C4=22µF, L=39µH, VOUT=5V, TA=25ºC, unless otherwise noted.
MP2499 Rev. 0.91
11/24/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
5
5 Page 
MP2499– INTEGRATED 100V LOAD DUMP PROTECTION, 2A STEP DOWN REGULATOR
Output Current Sensing
The output current can be sensed through the
DC resistance (DCR) of the inductor, as shown
in Figure 2a.
In Figure 2a, the output current limit is set as:
IOUT
=
100mV
DCR
×
Ra + Rb
Rb
Where DCR is the DC resistance of the inductor
winding.
In Figure 2a, it is desirable to keep
Ra ⋅ Rb
Ra + Rb
× CS
=
L1
DCR
For more accurate sensing, use a more
accurate (1% or less) sense resistor, as in
Figure 2b, where the output current limit is set
as:
IOUT
=
100mV
RSENSE
L1 DCR
SW
Ra Cs
ISP
Rb
ISN
(a)
VOUT
COUT
L1
SW
RSENSE
VOUT
COUT
ISP
ISN
(b)
Figure 2—Current Sensing Methods
MP2499 Rev. 0.91
11/24/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MP2499.PDF ] | |
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