MP2493 Datasheet, PDF (1/12 Pages) Monolithic Power Systems – 2A, 36V, Low EMI Step-Down Converter with Programmable Output Current Limit

The Future of Analog IC Technology
MP2493
2A, 36V, Low EMI Step-Down Converter
with Programmable Output Current Limit
DESCRIPTION
The MP2493 is a monolithic step-down switch
mode converter with a programmable output
current limit. It achieves 2A continuous output
current over a wide input supply range with
excellent load and line regulation.
The maximum output current can be
programmed by sensing current through the
inductor DC resistance (DCR) or an accurate
sense resistor.
Fault condition protection includes cycle-by-cycle
current limiting and thermal shutdown.
The MP2493 requires a minimum number of
readily available standard external components.
The MP2493 is available in 8-pin SOIC, and 8-
pin SOICE packages.
FEATURES
• Wide 4.5V to 36V Operating Input Range
• Programmable up to 2A Output Current
• Output Adjustable from 0.8V to 15V
• Programmable Output Current Limit without
power loss
• 0.25Ω Internal Power MOSFET Switch
• Stable with Low ESR Output Ceramic
Capacitors
• Up to 95% Efficiency
• Fixed 130kHz Frequency with low EMI
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Available in 8-Pin SOIC and 8-pin SOIC8E
Packages
APPLICATIONS
• USB Power Supplies
• Automotive Cigarette Lighter Adapters
• Power Supply for Linear Chargers
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
5V
VIN
6V - 36V
+
GND
D2
NS
TP2
R8
0
U1
7
C9
BST
0.1uF
R4
1 _VIN
ISN ⁵
1k
C5
0.1uF
MP2493
6
ISP
8
SW
4 _SS
FB ³
R9
C6
20k
47nF
C10 SW
R6
R3
4.7nF
4.02k
4.7k
D1
3A/40V
L1
33uH
DR1040-330-R
R1
604k
1%
GND
R5
2
TP1
0
R2
115k
1%
5V@2A
R7
200k
+
C7
150pF
C11
0.1uF
VOUT
GND
Efficiency
VOUT=5V
100
92
VIN=12V
84
76
68
60
0 0.4 0.8 1.2 1.6 2
OUTPUT CURRENT (A)
MP2493 Rev. 0.9
www.MonolithicPower.com
1
4/23/2010
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