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PDF MP2497 Data sheet ( Hoja de datos )
| Número de pieza | MP2497 | |
| Descripción | 100kHz Step-Down Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
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MP2497
3A, 50V, 100kHz Step-Down Converter
with Programmable Output OVP Threshold
The Future of Analog IC Technology
DESCRIPTION
The MP2497 is a monolithic step-down switch
mode converter with a programmable output
current limit. It achieves 3A continuous output
current over a wide input supply range with
excellent load and line regulation. An internal
2~4ms soft start prevents inrush current at turning
on. And it is capable of providing output line drop
compensation.
MP2497 achieves low EMI signature with well
controlled switching edges.
Fault condition protection includes hiccup current
limit and short circuit protection, programmable
output over voltage protection and thermal
shutdown.
The MP2497 requires a minimum number of
readily available standard external components.
The MP2497 is available in SOIC8 and SOIC8E
package.
FEATURES
• Wide 4.5V to 50V Operating Input Range
• Programmable Output Over Voltage
Protection
• Output Adjustable from 0.8V to 25V
• 0.15Ω Internal Power MOSFET Switch
• Internal 4ms Soft Start
• Stable with Low ESR Output Ceramic
Capacitors
• Fixed 100kHz Frequency
• Low EMI Signature
• Thermal Shutdown
• Output Line Drop Compensation
• Hiccup Circuit Limit and Short Circuit
Protection
• Available in SOIC8 and SOIC8E Package
APPLICATIONS
• USB Power Supplies
• Automotive Cigarette Lighter Adapters
• Power Supply for Linear Chargers
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
R6
0O
C2
2.2µF
VIN VIN
C1
220µF
C11
0.1µF
BST
GND
MP2497
SW
OVP
C6
0.1µF
L1
33µH
C3 C4 C10
100µF 22µF 0.1µF
+
D1
R4
10kO
R3
39kO
GND
FB
ISP
C7
10nF
ISN C8
10nF
R7
1kO
R5
1kO
C9
150pF
R2
R1
301kO
57.6kO
R SE NS E
33mO
C5
0.1µ F
V OUT
GND
Efficiency vs.
Output Current
VOUT=5V
95
90 VIN=12V
85
80 VIN=24V
75
70
VIN=50V
65
60
55
0.1 0.5 0.9 1.3 1.7 2.1 2.5 2.9
OUTPUT CURRENT (A)
MP2497 Rev. 1.12
www.MonolithicPower.com
12/22/2011
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
1
1 page  
MP2497 – 3A, 50V, 100kHz STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
C1=220μF, C2=2.2μF, C3=100μF, C4=22μF, L=33μH, RSENSE=33mΩ, TA=25ºC，unless otherwise
noted.
Output Line Drop
Compensation
5.02
5
4.98
4.96
4.94
4.92
VIN=12V
VIN=24V
VIN=50V
Loop Gain with
Phase Margin
VIN=12V, VOUT=5V, IOUT=3A
Resistor Load
80
60 Phase
40
20
0
Gain
-20
-40
-60
200
150
100
50
0
-50
-100
-150
Efficiency vs.
Output Current
VOUT=5V
95
90 VIN=12V
85
80 VIN=24V
75
70
VIN=50V
65
60
4.9
0 0.5
1 1.5 2 2.5
IOUT (A)
3 3.5
-80
0.1
1 10 100
FREQUENCY(kHz)
-200
1000
55
0.1 0.5 0.9 1.3 1.7 2.1 2.5 2.9
IOUT (A)
Load Regulation
Connect ISP, ISN to GND
4.99
4.985
4.98
4.975
4.97
VIN=50V
VIN=12V
4.965
4.96
VIN=24V
4.955
4.95
0 0.5
1 1.5 2 2.5
IOUT (A)
3 3.5
VFB vs. Temperature
VIN=12V
0.804
0.802
0.8
0.798
0.796
0.794
0.792
-50 -20 10 40 70 100 130
TEMPERATURE (oC)
EMI Radiation
VIN=12V, VOUT=5V, IOUT=3A
Resistor Load
90
80
70
60
50
40 EN55022
30
20
10
0
-10
30
100
FREQUENCY(MHz)
1000
MP2497 Rev. 1.12
www.MonolithicPower.com
12/22/2011
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
5
5 Page 
MP2497 – 3A, 50V, 100kHz STEP-DOWN CONVERTER
Programming the Short Circuit Current Limit
The hiccup current limit at output short
condition can be programmed to be lower by
external resisters (RS1, RS2, RS1=RS2), as shown
in figure 4.
When output voltage is lower than 200mV, the
current limit is described by:
IOUT _ SL × RSENSE + 6.2μA × RS1 = 100mV (14)
The current limit at output short condition is:
IOUT _ SL
=
100mV − 6.2μA × RS1
RSENSE
(15)
SW
RSENSE
ISP
RS1
ISN RS2
200mV
6.2uA
Figure 4—Short Circuit Current Limit
PC Board Layout
The high frequency path (IN, SW and GND)
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.
External Bootstrap Diode
It is recommended that an external bootstrap
diode be added when the system has a 5V
fixed input or the power supply generates a 5V
output. This helps improve the efficiency of the
regulator. The bootstrap diode can be a low
cost one such as IN4148 or BAT54.
This diode is also recommV ended for high duty
OUT
cycle operation (when V >65%) and high
IN
output voltage (VOUT>12V) applications.
5V
BS
MP2497
SW
10nF
Figure 5—External Bootstrap Diode
Design Example
Below is a design example following the
application guidelines for the specifications:
VIN
VOUT
VOVP
FSW
IOUT-L
8 to 50V
5V
6V
100kHz
3A
The detailed application schematic is shown in
Figure 6. The typical performance and circuit
waveforms have been shown in the Typical
Performance Characteristics section. For more
possible applications of this device, please refer
to related Evaluation Board Data Sheets.
MP2497 Rev. 1.12
www.MonolithicPower.com
12/22/2011
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MP2497.PDF ] | |
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