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PDF CM3406 Data sheet ( Hoja de datos )
| Número de pieza | CM3406 | |
| Descripción | 200KHz Step-Down Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
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TM CM3406
1.5A, 210KHz
Step-Down Converter
The Future of Analog IC Technology TM
MPS CONFIDENTIAL AND PROPRIETARY INFORMATION - ACCTON INTERNAL USE ONLY
DESCRIPTION
The CM3406 is a monolithic step-down switch
mode converter with a built-in internal power
MOSFET. It achieves 1.5A 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 protection includes cycle-by-cycle
current limiting and thermal shutdown. The
CM3406 requires a minimum number of readily
available standard external components.
EVALUATION BOARD REFERENCE
Board Number
EV3406DS-00A
Dimensions
2.3”X x 1.4”Y x 0.5”Z
FEATURES
• 1.5A Continuous Output Current
• 0.2Ω Internal Power MOSFET Switch
• Stable with Low ESR Output Ceramic Capacitors
• Up to 95% Efficiency
• 20μA Shutdown Mode
• Fixed 210KHz Frequency
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Wide 4.75V to 22V Operating Input Range
• Output Adjustable from 1.23V to 18V
• Programmable Under Voltage Lockout
• Available in 8-Pin SO and PDIP Packages
APPLICATIONS
• Distributed Power Systems
• Battery Chargers
• Pre-Regulator for Linear Regulators
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
C4
10nF
VIN
12V 3 2
ENABLE
SHUTDOWN
OPEN
NOT USED
8
EN
1
NC
CM3406
4
SW
6
FB
GND
5
C6
OPEN
COMP
7
C3
4.7nF
D1
B230A
VOUT
2.5V/1.5A
CM3406_TAC_S01
Efficiency vs
Load Current
100 VOUT = 5V
95
90
85
80
75
VOUT = 3.3V VOUT = 2.5V
70
65
60
55
50
45
VIN = 12V
40
0.25 0.50 0.75 1.00 1.25 1.50
LOAD CURRENT (A)
CM3406-EC01
CM3406 Rev. 1.6
10/29/2009
www.DataSheet.in
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
1
2009110322430097
1 page  
TM
CM3406 – 1.5A, 210KHz STEP-DOWN CONVERTER
MPS CONFIDENTIAL AND PROPRIETARY INFORMATION - ACCTON INTERNAL USE ONLY
BLOCK DIAGRAM
IN 2
EN 7
7.0V
INTERNAL
REGULATORS
5V
OSCILLATOR
SLOPE
COMP
130/210KHz
CLK
+
1.0V --
--
SHUTDOWN
COMPARATOR
LOCKOUT
COMPARATOR
2.30V/
2.50V
+
+
--
CURRENT
SENSE
AMPLIFIER
+
--
5V
+ SQ
RQ
-- CURRENT
COMPARATOR
1.8V
1 BS
M1
3 SW
M2
4 GND
FREQUENCY
FOLDBACK
COMPARATOR
-- 0.7V 1.23V + ERROR
AMPLIFIER
5 FB
6 COMP
CM3406_BD01
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
Where VFB is the feedback voltage and VOUT is the
output voltage.
Thus the output voltage is:
VOUT
=
1.23
×
R1 + R2
R2
R2 can be as high as 100kΩ, but a typical value
is 10kΩ. Using that value, R1 is determined by:
R1 = 8.18 × (VOUT − 1.23)
For example, for a 3.3V output voltage, R2 is
10kΩ, and R1 is 17kΩ.
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 × ΔIL
× ⎜⎜⎝⎛1−
VOUT
VIN
⎟⎟⎠⎞
Where fS is the switching frequency, ΔIL is the
peak-to-peak inductor ripple current and VIN is the
input voltage.
CM3406 Rev. 1.6
10/29/2009
www.DataSheet.in
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
5
2009110322430097
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet CM3406.PDF ] | |
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