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PDF MP2159 Data sheet ( Hoja de datos )
| Número de pieza | MP2159 | |
| Descripción | Synchronous Step Down Switcher | |
| Fabricantes | MPS | |
| Logotipo |  |
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The Future of Analog IC Technology
DESCRIPTION
The MP2159 is a monolithic step-down switch
mode converter with built-in internal power
MOSFETs. It achieves 1A continuous output
current from a 2.5V to 6V input voltage with
excellent load and line regulation. The output
voltage can be regulated as low as 0.6V.
The Constant-On-Time control scheme
provides fast transient response and eases loop
stabilization. Fault condition protection includes
cycle-by-cycle current limiting and thermal
shutdown.
The MP2159 is available in the small TSOT23-8
package and requires a minimum number of
readily available standard external components.
The MP2159 is ideal for a wide range of
applications including High Performance DSPs,
FPGAs, PDAs, and portable instruments.
TYPICAL APPLICATION
MP2159
1A, 6V, 1.5MHz, 17μA IQ, COT
Synchronous Step Down Switcher
In 8-pin TSOT23
FEATURES
• Very Low IQ: 17μA
• Default 1.5MHz Switching Frequency
• EN and Power Good for Power Sequencing
• Wide 2.5V to 6V Operating Input Range
Output Adjustable from 0.6V
• Up to 1A Output Current
• 100% Duty Cycle in Dropout
• 118mΩ and 88mΩ Internal Power MOSFET
Switches
• Cycle-by-Cycle Over Current Protection
• Short Circuit Protect with Hiccup Mode
• Stable with Low ESR Output Ceramic
Capacitors
• Available in a TSOT23-8 Package
APPLICATIONS
• Wireless/Networking Cards
• Portable Instruments
• Battery Powered Devices
• Low Voltage I/O System Power
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.
MP2159 Rev. 1.03
www.MonolithicPower.com
9/6/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
1
Free Datasheet http://www.datasheet4u.com/
1 page  
MP2159 – 1A, 6V, 1.5MHz SYNCHRONOUS STEP-DOWN SWITCHER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 5V, VOUT = 1.2V, L = 1.0µH, TA = +25ºC, unless otherwise noted.
MP2159 Rev. 1.03
www.MonolithicPower.com
9/6/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
MP2159 – 1A, 6V, 1.5MHz SYNCHRONOUS STEP-DOWN SWITCHER
Selecting the Output Capacitor
The output capacitor (C2) is required to
maintain the DC output voltage. Ceramic
capacitors are recommended. Low ESR
capacitors are preferred to keep the output
voltage ripple low. The output voltage ripple can
be estimated by:
ΔVOUT
=
VOUT
fS × L1
× ⎜⎛1−
⎝
VOUT
VIN
⎞
⎟
×
⎛
⎜
RESR
⎠⎝
+
1⎞
8
×
fS
×
C2
⎟
⎠
Where L1 is the inductor value and RESR is the
equivalent series resistance (ESR) value of the
output capacitor.
Using ceramic capacitors, the impedance at the
switching frequency is dominated by the
capacitance. The output voltage ripple is mainly
caused by the capacitance. For simplification,
the output voltage ripple can be estimated by:
ΔVOUT
=
8
×
fS
VOUT
2 × L1
×
C2
×
⎛⎜1
⎝
−
VOUT
VIN
⎞
⎟
⎠
In the case of tantalum or electrolytic capacitors,
the ESR dominates the impedance at the
switching frequency. For simplification, the
output ripple can be approximated to:
ΔVOUT
=
VOUT
fS × L1
× ⎛⎜⎝1−
VOUT
VIN
⎞
⎟⎠
×
RESR
The characteristics of the output capacitor also
affect the stability of the regulation system.
PCB Layout
Proper layout of the switching power supplies is
very important, and sometimes critical for
proper function. For the high-frequency
switching converter, poor layout design can
result in poor line or load regulation and stability
issues.
The high current paths (GND, IN and SW)
should be placed very close to the device with
short, direct and wide traces. The input
capacitor needs to be as close as possible to
the IN and GND pins. The external feedback
resistors should be placed next to the FB pin.
Keep the switching node SW short and away
from the feedback network.
VIN
GND
R4 SW L1 OUT
R3
C1A C1
1
2
3
4
8
7
6
5
Figure 3: PCB Layout Recommendation
Design Example
Below is a design example following the
application guidelines for the specifications:
Table 2: Design Example
VIN
VOUT
fSW
5V
1.2V
1500kHz
The detailed application schematic is shown in
Figure 4. 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.
MP2159 Rev. 1.03
www.MonolithicPower.com
9/6/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MP2159.PDF ] | |
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