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PDF MP2459 Data sheet ( Hoja de datos )
| Número de pieza | MP2459 | |
| Descripción | Step-Down Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MP2459 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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The Future of Analog IC Technology
DESCRIPTION
The MP2459 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 MP2459 requires a minimal number of
readily-available external components. The
MP2459 is available in a TSOT23-6 package.
MP2459
0.5A, 55V, 480kHz
Step-Down Converter in a TSOT23-6
FEATURES
• 0.5A Peak Output Current
• 1Ω Internal Power MOSFET
• Stable with Low-ESR Ceramic Output
Capacitors
• Up to 90% Efficiency
• 0.1μA Shutdown Mode
• Fixed 480kHz Frequency
• Thermal Shutdown
• Cycle-by-Cycle Over-Current Protection
• Wide 4.5V-to-55V Operating Input Range
• Output Adjustable from 0.81V to 0.95*VIN
• 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.
TYPICAL APPLICATION
VIN
GND
EN
IN BST
MP2459
U1
SW
EN
FB
L1
D1
VOUT
GND
100
90
80
70
60
50
40
300.0 0.1 0.2 0.3 0.4 0.5 0.6
MP2459 Rev. 1.01
www.MonolithicPower.com
6/19/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
1
1 page  
MP2459 – 0.5A, 55V, 480kHz, STEP-DOWN CONVERTER IN A TSOT23-6
TYPICAL PERFORMANCE CHARACTERISTICS
VIN=12V, VOUT=5V, L=22μH, TA=25°C, unless otherwise noted.
Efficiency vs. Load
Load Regulation
100
90
80
70
60
50
40
30
0.0
0.2 0.4 0.6 0.8
LOAD CURRENT ( A )
1.0
2.0
1.6
1.2
0.8
0.4
0.0
-0.4
-0.8
-1.2
-1.6
-2.0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
LOAD CURRENT ( A )
Line Regulation
IOUT=0.5A
2.0
1.6
1.2
0.8
0.4
0.0
-0.4
-0.8
-1.2
-1.6
-2.0
6
16 26 36 46
INPUT VOLTAG ( V )
56
100
90
80
70
60
50
40
30
0.0
0.2 0.4 0.6 0.8
LOAD CURRENT ( A )
1.0
Load Regulation
VOUT=3.3V
2.0
1.6
1.2
0.8
0.4
0.0
-0.4
-0.8
-1.2
-1.6
-2.0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
LOAD CURRENT ( A )
2.0
1.6
1.2
0.8
0.4
0.0
-0.4
-0.8
-1.2
-1.6
-2.0
6
16 26 36 46 56
INPUT VOLTAG ( V )
2.0
1.7
1.4
1.1
0.8
0.5
-40 -10 20 50 80 110 140
600 850
560 830
520 810
480 790
440 770
400
-40 -10 20 50 80 110 140
750
-40 -10 20 50 80 110 140
MP2459 Rev. 1.01
www.MonolithicPower.com
6/19/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
5
5 Page 
MP2459 – 0.5A, 55V, 480kHz, STEP-DOWN CONVERTER IN A TSOT23-6
For most designs, the required inductance
value can be derived from the following
equation.
L
=
VOUT × (VIN − VOUT )
VIN × ΔIL × 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
+
ΔIL
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
.
Figure 2: PCB Layout
MP2459 Rev. 1.01
www.MonolithicPower.com
6/19/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MP2459.PDF ] | |
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