|
|
PDF MP2361 Data sheet ( Hoja de datos )
| Número de pieza | MP2361 | |
| Descripción | 1.4MHz Step-Down Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MP2361 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
TM
The Future of Analog IC Technology TM
DESCRIPTION
The MP2361 is a monolithic step-down switch
mode converter with a built-in internal power
MOSFET. It achieves 2A 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 protections include cycle-by-cycle
current limiting and thermal shutdown. In
shutdown mode the regulator draws 20µA of
supply current. Programmable soft-start
minimizes the inrush supply current and the
output overshoot at initial startup.
The MP2361 requires a minimum number of
readily available standard external components.
EVALUATION BOARD REFERENCE
Board Number
EV2361DQ-00A
Dimensions
2.3”X x 1.5”Y x 0.5”Z
MP2361
2A, 23V, 1.4MHz
Step-Down Converter
FEATURES
• 2A Output Current with QFN Package
• 0.18Ω Internal Power MOSFET Switch
• Stable with Low ESR Output Ceramic
Capacitors
• 90% Efficiency
• 20µA Shutdown Mode
• Fixed 1.4MHz Frequency
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Wide 4.75V to 23V Operating Input Range
• Output Adjustable from 0.92V to 16V
• Programmable Under Voltage Lockout
• Available in 10-pin QFN (3mm x 3mm) and
Tiny MSOP Packages
• Evaluation Board Available
APPLICATIONS
• Distributed Power Systems
• Battery Charger
• DSL Modems
• Pre-Regulator for Linear Regulators
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
INPUT
4.75V to 23V
C5
10nF
42
IN
9
EN
BS
SW 5
MP2361
10 SS
7
FB
GND
COMP
C4
10nF
6
C6
OPEN
8
C3
1.8nF
D1
B220A
VOUT
2.5V/2A
MP2361_TAC_S01
Efficiency vs
Load Current
100
90 VOUT=5V
80
70 VOUT=3.3V
60
VOUT=2.5V
50
0
0.5 1.0 1.5
LOAD CURRENT (A)
2.0
MP2361-EC01
MP2361 Rev. 1.2
1/11/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
1
1 page  
TM
MP2361 – 2A, 23V, 1.4MHz STEP-DOWN CONVERTER
APPLICATION INFORMATION
COMPONENT SELECTION
Setting the Output Voltage
The output voltage is set using a resistive voltage
divider from the output voltage to FB pin. The
voltage divider divides the output voltage down to
the feedback voltage by the ratio:
VFB
=
VOUT
R2
R1 + R2
Thus the output voltage is:
VOUT
=
0.92
×
R1 + R2
R2
Where VOUT is the output voltage and VFB is the
feedback voltage.
A typical value for R2 can be as high as 100kΩ,
but a typical value is 10kΩ. Using that value, R1
is determined by:
R1 = 10.87 × (VOUT − 0.92)
For example, for a 3.3V output voltage, R2 is
10kΩ, and R1 is 25.8kΩ.
Inductor
The inductor is required to supply constant
current to the output load while being driven by
the switched input voltage. A larger value inductor
will result in less ripple current that will result in
lower output ripple voltage. However, the larger
value inductor will have a larger physical size,
higher series resistance, and/or lower saturation
current. A good rule for determining the
inductance to use is to allow the peak-to-peak
ripple current in the inductor to be approximately
30% of the maximum switch current limit. Also,
make sure that the peak inductor current is below
the maximum switch current limit. The inductance
value can be calculated by:
L
=
VOUT
fS × ∆IL
× ⎜⎜⎝⎛1−
VOUT
VIN
⎟⎟⎠⎞
Where fS is the switching frequency, ∆IL is the
peak-to-peak inductor ripple current and VIN is
the input voltage.
Choose an inductor that will not saturate under
the maximum inductor peak current. The peak
inductor current can be calculated by:
ILP
= ILOAD
+
VOUT
2 × fS × L
× ⎜⎜⎝⎛1−
VOUT
VIN
⎟⎟⎠⎞
Where ILOAD is the load current.
Output Rectifier Diode
The output rectifier diode supplies the current to
the inductor when the high-side switch is off. To
reduce losses due to the diode forward voltage
and recovery times, use a Schottky diode.
Choose a diode whose maximum reverse
voltage rating is greater than the maximum
input voltage, and whose current rating is
greater than the maximum load current.
Input Capacitor
The input current to the step-down converter is
discontinuous, therefore a capacitor is required
to supply the AC current to the step-down
converter while maintaining the DC input
voltage. Use low ESR capacitors for the best
performance. Ceramic capacitors are preferred,
but tantalum or low-ESR electrolytic capacitors
may also suffice.
Since the input capacitor (C1) absorbs the input
switching current it requires an adequate ripple
current rating. The RMS current in the input
capacitor can be estimated by:
IC1 = ILOAD ×
VOUT
VIN
×⎜⎜⎛1−
⎝
VOUT
VIN
⎟⎞
⎟
⎠
The worst-case condition occurs at VIN = 2VOUT,
where:
IC1
=
ILOAD
2
For simplification, choose the input capacitor
whose RMS current rating greater than half of
the maximum load current.
MP2361 Rev. 1.2
1/11/2006
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 MP2361.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MP2360 | 1.4MHz Step-Down Converter | MPS |
| MP2361 | 1.4MHz Step-Down Converter | MPS |
| MP2362 | 380KHz Step-Down Converter | MPS |
| MP2363 | 365KHz Step-Down Converter | MPS |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |