|
|
PDF MP2456 Data sheet ( Hoja de datos )
| Número de pieza | MP2456 | |
| Descripción | Step-Down Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MP2456 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
|
No Preview Available !
MP2456
0.5A, 50V, 1.2MHz
Step-Down Converter in a TSOT23-6
DESCRIPTION
The MP2456 is a monolithic, step-down, switch-
mode converter with a built-in power MOSFET.
It achieves a 0.5A peak-output current over a
wide input supply range with excellent load and
line regulation. Current-mode operation
provides a fast transient response and eases
loop stabilization. Fault condition protections
include cycle-by-cycle current limiting and thermal
shutdown.
The MP2456 requires a minimal number of
readily-available external components. The
MP2456 is available in a TSOT23-6 package.
TYPICAL APPLICATION
FEATURES
0.5A Peak Output Current
1Ω Internal Power MOSFET
Capable to Start Up with Big Output
Capacitor
Stable with Low-ESR Ceramic Output
Capacitors
Up to 90% Efficiency
0.1μA Shutdown Mode
Fixed 1.2MHz Frequency
Thermal Shutdown
Cycle-by-Cycle Over-Current Protection
Wide 4.5V-to-50V Operating Input Range
Output Adjustable from 0.81V to 0.9xVIN
Available in a TSOT23-6 Package
APPLICATIONS
Power Meters
Distributed Power Systems
Battery Chargers
Pre-Regulator for Linear Regulators
WLED Drivers
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
VIN
GND
EN
C1
4.7µF
5 IN
BST 1
MP2456
U1 SW 6
4 EN
GND
2
FB 3
R1
23.7k
C2
100nF
L1
10µH
D1
R2
124k
C3
10µF
5V VOUT
GND
MP2456 Rev. 1.0
10/24/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
1
1 page  
MP2456 – 0.5A, 50V, 1.2MHz, STEP-DOWN CONVERTER IN A TSOT23-6
TYPICAL PERFORMANCE CHARACTERISTICS
VIN=12V, VOUT=5V, L=10μH, TA=25°C, unless otherwise noted.
MP2456 Rev. 1.0
10/24/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
5
5 Page 
MP2456 – 0.5A, 50V, 1.2MHz, STEP-DOWN CONVERTER IN A TSOT23-6
APPLICATION INFORMATION
Setting Output Voltage
The external resistor divider sets the output
voltage (see the Typical Application schematic).
Table 1 lists resistors for common output
voltages. The feedback resistor (R2) also sets
the feedback loop bandwidth with the internal
compensation capacitor (see Figure 1). R1 is:
R1 R2
VOUT 1
0.812V
Table 1: Resistor Selection for Common
Output Voltages
VOUT (V)
1.8
2.5
3.3
5
12
R1 (kΩ)
102 (1%)
59 (1%)
40.2 (1%)
23.7 (1%)
8.2 (1%)
R2 (kΩ)
124 (1%)
124 (1%)
124 (1%)
124 (1%)
113 (1%)
Selecting the Inductor
Use an inductor with a DC current rating at
least 25% percent higher than the maximum
load current for most applications. For best
efficiency, the inductor’s DC resistance should
be less than 200mΩ. Refer to Table 2 for
suggested surface-mount inductors. For most
designs, the required inductance value can be
derived from the following equation.
L VOUT (VIN VOUT )
VIN IL fSW
Where ΔIL is the inductor ripple current.
Choose the inductor ripple current to be 30% of
the maximum load current. The maximum
inductor peak current is:
IL(MAX )
ILOAD
IL
2
Under light-load conditions (below 100mA), use
a larger inductance to improve efficiency.
Selecting the Input Capacitor
The input capacitor reduces the surge current
drawn from the input supply and the switching
noise from the device. The input capacitor
impedance at the switching frequency should be
less than the input source impedance to prevent
high-frequency-switching current from passing
through the input. Use ceramic capacitors with
X5R or X7R dielectrics for their low ESRs and
small temperature coefficients. For most
applications, a 4.7µF capacitor will sufficient.
Selecting the Output Capacitor
The output capacitor keeps the output voltage
ripple small and ensures feedback loop stability.
The output capacitor impedance should be low
at the switching frequency. Use ceramic
capacitors with X5R or X7R dielectrics for their
low ESR characteristics. For most applications,
a 22µF ceramic capacitor will sufficient.
PCB Layout Guide
PCB layout is very important to stability. Please
follow these guidelines and use Figure 2 as
reference.
1) Keep the path of switching current short
and minimize the loop area formed by the
input capacitor, high-side MOSFET, and
Schottky diode.
2) Keep the connection from the power
ground→Schottky diode→SW pin as short
and wide as possible.
3) Ensure all feedback connections are short
and direct. Place the feedback resistors
and compensation components as close to
the chip as possible.
4) Route SW away from sensitive analog
areas such as FB.
5) Connect IN, SW, and especially GND to
large copper areas to cool the chip for
improved thermal performance and long-
term reliability. For single layer PCBs, avoid
soldering the exposed pad
.
MP2456 Rev. 1.0
10/24/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MP2456.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MP245 | Low Cost Quartz Crystal |  CTS |
| MP245-E | Low Cost Quartz Crystal | CTS |
| MP2450 | (MP24xx) Microwave Schottky Ring Quads |  M-Pulse Microwave |
| MP2451 | (MP24xx) Microwave Schottky Ring Quads | M-Pulse Microwave |
| 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 |