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PDF MP8706 Data sheet ( Hoja de datos )
| Número de pieza | MP8706 | |
| Descripción | Synchronous Step-down Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
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MP8706
High Efficiency 3A, 16V, 500KHz
Synchronous Step-down Converter
The Future of Analog IC Technology
MPS CONFIDENTIAL AND PROPRIETARY INFORMATION - HBGK INTERNAL USE ONLY
DESCRIPTION
FEATURES
The MP8706 is a high frequency synchronous
rectified step-down switch mode converter with
built in internal power MOSFETs. It offers a
very compact solution to achieve 3A continuous
output current over a wide input supply range
with excellent load and line regulation. The
MP8706 has synchronous mode operation for
higher efficiency over output current load range.
Current mode operation provides fast transient
response and eases loop stabilization.
Full protection features include OCP and
thermal shut down.
The MP8706 requires a minimum number of
readily available standard external components
and is available in a space saving 8-pin SOIC
package with an exposed pad.
• Wide 4.5V to 16V Operating Input Range
• 3A Output Current
• Low Rds(on) Internal Power MOSFETs
• Proprietary Switching Loss Reduction
Technique
• High Efficiency Synchronous Mode Operation
• Fixed 500KHz Switching Frequency
• Sync from 300KHz to 2MHz External Clock
• Internal Compensation
• Integrated Bootstrap Diode
• OCP Protection and Thermal Shutdown
• Output Adjustable from 0.805V
• Available in a Thermally Enhanced 8-pin SOIC
package
APPLICATIONS
• Notebook Systems and I/O Power
• Networking Systems
• Digital Set Top Boxes
• Personal Video Recorders
• Flat Panel Television and Monitors
• Distributed Power Systems
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
VIN
ON/OFF
1 IN
C1
22uF
7 VCC
C3
0.1uF
MP8706
5 EN/SYNC
GND
8
BST 4
SW 2,3
C4
0.1uF
L1
1.8uH
FB 6
Rt
24.9K
R1
4.99K
R2
10K
C2
47uF
VOUT 1.2V
Efficiency
100
90
80
70
Vin=5V
Vin=12V
Vin=16V
60
50
40
0
0.5 1 1.5 2 2.5
OUTPUT CURRENT (A)
3
MP8706 Rev. 0.9
5/5/2009
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
1
2009051820510090
Free Datasheet http://www.datasheet-pdf.com/
1 page  
MP8706 – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
MPS CONFIDENTIAL AND PROPRIETARY INFORMATION - HBGK INTERNAL USE ONLY
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, VOUT = 1.2V, L=1.8uH, TA = +25ºC, unless otherwise noted.
Enabled Supply Current vs.
Input Voltage
750
745
740
735
730
725
720
715
710
705 VFB=1V
700
0 5 10 15 20
INPUT VOLTAGE (V)
Vcc Regulator Line Regulation
5.5
5
4.5
4
3.5
0
5 10 15
INPUT VOLTAGE (V)
20
Peak Current vs.
Duty Cycle
7
6.8
6.6
6.4
6.2
6
5.8
5.6
5.4
5.2
5
0 10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
Operating Range
100
Dmax Limit
10
1 Minimum on time Limit
0.1
0
5 10 15 20
INPUT VOLTAGE (V)
Case Temperature Rise vs.
Output Current
16
14
12
10
8
6
4
2
0
01234
OUTPUT CURRENT (A)
.
Load Regulation
0.3
0.2
0.1
0.0
-0.1
Vin=5V
Vin=16V
Vin=12V
-0.2
-0.3
0 0.5 1 1.5 2 2.5 3
OUTPUT CURRENT (A)
Efficiency
100
90
80
70
Vin=5V
Vin=12V
Vin=16V
60
50
40
0
0.5 1 1.5 2 2.5
OUTPUT CURRENT (A)
3
Line Regulation
0.3
0.2
0.1
0.0
-0.1
-0.2
-0.3
0
Io=0A
Io=1.5A
Io=3A
5 10 15 20
INPUT VOLTAGE (V)
MP8706 Rev. 0.9
5/5/2009
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
5
2009051820510090
Free Datasheet http://www.datasheet-pdf.com/
5 Page 
MP8706 – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
MPS CONFIDENTIAL AND PROPRIETARY INFORMATION - HBGK INTERNAL USE ONLY
Selecting the Output Capacitor
The output capacitor (C2) is required to
maintain the DC output voltage. Ceramic,
tantalum, or low ESR electrolytic capacitors are
recommended. Low ESR capacitors are
preferred to keep the output voltage ripple low.
The output voltage ripple can be estimated by:
the chip to improve thermal performance
and long-term reliability.
6) Adding RC snubber circuit from IN pin to
SW pin can reduce SW spikes.
ΔVOUT
=
VOUT
fS × L
×
⎜⎜⎝⎛1
−
VOUT
VIN
⎟⎟⎠⎞ × ⎜⎜⎝⎛RESR
+
8
×
1
fS ×
C2
⎟⎟⎠⎞
Where L is the inductor value and RESR is the
equivalent series resistance (ESR) value of the
output capacitor.
In the case of 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
×
VOUT
fS2 × L
×
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 × L
×
⎜⎜⎝⎛1 −
VOUT
VIN
⎟⎟⎠⎞ × RESR
The characteristics of the output capacitor also
affect the stability of the regulation system. The
MP8706 can be optimized for a wide range of
capacitance and ESR values.
PCB Layout
PCB layout is very important to achieve stable
operation. Please follow these guidelines and
take Figure 4 for references.
1) Keep the connection of input ground and
GND pin as short and wide as possible.
2) Keep the connection of input capacitor and
IN 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
respectively to a large copper area to cool
Top Layer
Bottom Layer
Figure 4—PCB Layout
MP8706 Rev. 0.9
5/5/2009
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
11
2009051820510090
Free Datasheet http://www.datasheet-pdf.com/
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MP8706.PDF ] | |
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